Toyota Avalon (XX50): Electric Parking Brake System(for Hv Model)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Parking Brake / Electric Parking Brake System(for Hv Model)

Open circuit in Power source circuit (C13A0,C13A5,C13B0)

DESCRIPTION

The following DTCs are stored when a malfunction occurs in the parking brake ECU (brake actuator assembly).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
C13A0	Open circuit in Power source circuit	Both of following conditions are met: Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off. Parking brake ECU (brake actuator assembly) power source relay circuit is open for approximately 0.5 seconds.	Parking brake ECU (brake actuator assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13A5	Electric Current of Motor	Both of following conditions are met: Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off. Parking brake ECU (brake actuator assembly) internal current is abnormal for approximately 0.1 to 0.5 seconds (differs according to malfunction).	Parking brake ECU (brake actuator assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13B0	Electric Parking Brake ECU Malfunction	Both of following conditions are met: Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off. Internal current of Parking brake ECU (brake actuator assembly) or ECU components abnormal for a maximum of 60 seconds (differs according to malfunction).	Parking brake ECU (brake actuator assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A0

Open circuit in Power source circuit

Both of following conditions are met:

Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off.
Parking brake ECU (brake actuator assembly) power source relay circuit is open for approximately 0.5 seconds.

Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

C13A5

Electric Current of Motor

Both of following conditions are met:

Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off.
Parking brake ECU (brake actuator assembly) internal current is abnormal for approximately 0.1 to 0.5 seconds (differs according to malfunction).

Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

C13B0

Electric Parking Brake ECU Malfunction

Both of following conditions are met:

Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off.
Internal current of Parking brake ECU (brake actuator assembly) or ECU components abnormal for a maximum of 60 seconds (differs according to malfunction).

Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

DTC Detection Conditions: C13A0

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Power switch on (IG)	○	-
Diagnosis Condition	Electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off	-	○
Malfunction Status	Parking brake ECU (brake actuator assembly)'s power source relay is open	○	○
Detection Time		Approximately 0.5 seconds	Approximately 0.5 seconds
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C13A5

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4
Diagnosis Condition	Power switch on (IG)	○	-	○	-
Diagnosis Condition	Electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off	-	○	-	○
Malfunction Status	Parking brake ECU (brake actuator assembly)'s internal current is abnormal (When parking brake is operating)	○	○	-	-
Malfunction Status	Parking brake ECU (brake actuator assembly)'s internal current is abnormal (When parking brake is not operating)	-	-	○	○
Detection Time		Approximately 0.3 seconds	Approximately 0.3 seconds	Approximately 0.5 seconds	Approximately 0.5 seconds
Number of Trips		1 trip	1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C13B0

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4
Diagnosis Condition	Power switch on (IG)	○	-	○	-
Diagnosis Condition	Electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off	-	○	-	○
Malfunction Status	Parking brake ECU (brake actuator assembly)'s internal voltage is abnormal	○	○	-	-
Malfunction Status	EEPROM is malfunctioning	-	-	○	○
Detection Time		Approximately 0.5 seconds	Approximately 0.5 seconds	Approximately 0.5 seconds	Approximately 0.5 seconds
Number of Trips		1 trip	1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

PROCEDURE

1.	REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

(a) Replace the parking brake ECU (brake actuator assembly).

Click here

END

Short circuit in Power source circuit (C13A1)

DESCRIPTION

C13A1 is stored if the power supply relay in the parking brake ECU assembly has a short circuit.

C13A1 is stored if the power switch is off and a voltage of 2.5 V or higher is applied to the IG terminal and an electric parking brake switch assembly malfunction or wire harness malfunction between the switch and ECU occurs.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
C13A1	Short circuit in Power source circuit	Both of following conditions are met: Electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off. Parking brake ECU (brake actuator assembly) power source relay shorted for approximately 60 seconds.	Wire harness or connector Electric parking brake switch (electric parking brake switch assembly) Parking brake ECU (brake actuator assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A1

Short circuit in Power source circuit

Both of following conditions are met:

Electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off.
Parking brake ECU (brake actuator assembly) power source relay shorted for approximately 60 seconds.

Wire harness or connector
Electric parking brake switch (electric parking brake switch assembly)
Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (BEPB CIRCUIT)

*a	Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly))

(a) Turn the power switch off.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A39-9 (BEPB) - Body ground	Power switch off	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - IG POWER SOURCE CIRCUIT)

*a	Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly))

(a) Turn the power switch off.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A39-26 (IG) - Body ground	Power switch off	Below 2.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(a) Remove the electric parking brake switch (electric parking brake switch assembly).

Click here

(b) Inspect the electric parking brake switch (electric parking brake switch assembly).

Click here

REPLACE ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

4.	CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY))

*a	Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly))

(a) Disconnect the G24 electric parking brake switch (electric parking brake switch assembly) connector.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A39-14 (SWI1) - Body ground	Always	10 kΩ or higher
A39-20 (SWO1) - Body ground	Always	10 kΩ or higher
A39-24 (SWI2) - Body ground	Always	10 kΩ or higher
A39-22 (SWO2) - Body ground	Always	10 kΩ or higher

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Engine Switch/Power Switch Malfunction (C13A2)

DESCRIPTION

When the power switch is turned on (IG), power is supplied to the parking brake ECU (brake actuator assembly). This DTC is stored if IG power source voltage is not supplied to the parking brake ECU (brake actuator assembly) when communication with other ECUs is established.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
C13A2	Engine Switch/Power Switch Malfunction	Both of following conditions are met: Power switch on (IG) When hybrid vehicle control ECU communicates with main body ECU (multiplex network body ECU) via CAN communication, IG power supply voltage is not received for approximately 15 seconds.	Wire harness or connector IG power source circuit Parking brake ECU (brake actuator assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A2

Engine Switch/Power Switch Malfunction

Both of following conditions are met:

Power switch on (IG)
When hybrid vehicle control ECU communicates with main body ECU (multiplex network body ECU) via CAN communication, IG power supply voltage is not received for approximately 15 seconds.

Wire harness or connector
IG power source circuit
Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

PROCEDURE

1.	READ VALUE USING TECHSTREAM (IG SWITCH)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(f) Read the Data List according to the display on the Techstream.

Chassis > Electric Parking Brake > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
IG Switch	IG power source status	OFF or ON	OFF: IG power source voltage is not input to skid control ECU (brake booster with master cylinder assembly) ON: IG power source voltage is input to skid control ECU (brake booster with master cylinder assembly)	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

IG Switch

IG power source status

OFF or ON

OFF: IG power source voltage is not input to skid control ECU (brake booster with master cylinder assembly)

ON: IG power source voltage is input to skid control ECU (brake booster with master cylinder assembly)

Chassis > Electric Parking Brake > Data List

Tester Display
IG Switch

GO TO STEP 3

CHECK DTC

(a) Clear the DTCs.

Chassis > Electric Parking Brake > Clear DTCs

(b) Turn the power switch off.

Chassis > Electric Parking Brake > Trouble Codes

Result	Proceed to
DTCs are output	A
DTCs are not output	B

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - POWER SOURCE AND BODY GROUND)

*a	Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly))

(a) Disconnect the A39 parking brake ECU (brake actuator assembly) connectors.

(b) Turn the power switch on (IG).

Standard Voltage:

Tester Connection	Condition	Specified Condition
A39-26 (IG) - Body ground	Power switch on (IG)	8 to 16 V

(d) Turn the power switch off.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A39-2 (EGND) - Body ground	Always	Below 1 Ω

REPAIR IG POWER SOURCE CIRCUIT

REPAIR OR REPLACE HARNESS OR CONNECTOR

Open or Short Circuit in Motor (C13A6)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
C13A6	Open or Short Circuit in Motor	Both of following conditions are met: Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off. Power supply voltage and +B voltage are normal, but parking brake motor circuit is malfunctioning for approximately 1 to 2 seconds.	Parking brake actuator assembly Wire harness or connector Parking brake ECU (brake actuator assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A6

Open or Short Circuit in Motor

Both of following conditions are met:

Power switch on (IG) or electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off.
Power supply voltage and +B voltage are normal, but parking brake motor circuit is malfunctioning for approximately 1 to 2 seconds.

Parking brake actuator assembly
Wire harness or connector
Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

DTC Detection Conditions

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Power switch on (IG)	○	-
Diagnosis Condition	Electric parking brake switch (electric parking brake switch assembly) pulled to lock side with power switch off	-	○
Malfunction Status	Voltage of power supplied to ECU is normal but malfunction exists in parking brake motor circuit	○	○
Detection Time		Approximately 1 to 2 seconds	Approximately 1 to 2 seconds
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

PROCEDURE

1.	READ VALUE USING TECHSTREAM (PERMISSION OF RH INTERLOCKING PKB LOCK / PERMISSION OF LH INTERLOCKING PKB LOCK)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(f) Read the Data List according to the display on the Techstream.

Chassis > Electric Parking Brake > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Permission of RH Interlocking PKB Lock	Parking brake actuator assembly RH parking brake lock control permission status	OK or NG	OK	-
Permission of LH Interlocking PKB Lock	Parking brake actuator assembly RH parking brake lock control permission status	OK or NG	OK	-

Chassis > Electric Parking Brake > Data List

Tester Display
Permission of RH Interlocking PKB Lock
Permission of LH Interlocking PKB Lock

2.	INSPECT PARKING BRAKE WIRE ASSEMBLY

*A	RH	*B	LH
*a	Front view of Parking Brake Wire Assembly	*b	(to wire harness connector)
*c	(to Parking Brake Actuator Assembly)	-	-

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Inspect the parking brake wire assembly.

Standard Resistance:

Tester Connection	Condition	Specified Condition
YK1-1 (MRR-) - Y4-1 (RE-)	Always	Below 1 Ω
YK1-1 (MRR-) or Y4-1 (RE-) - Body ground and other terminals	Always	10 kΩ or higher
YK1-2 (MRR+) - Y4-2 (RE+)	Always	Below 1 Ω
YK1-2 (MRR+) or Y4-2 (RE+) - Body ground and other terminals	Always	10 kΩ or higher

Tester Connection	Condition	Specified Condition
YK2-1 (MRL-) - Y1-1 (LE-)	Always	Below 1 Ω
YK2-1 (MRL-) or Y1-1 (LE-) - Body ground and other terminals	Always	10 kΩ or higher
YK2-2 (MRL+) - Y1-2 (LE+)	Always	Below 1 Ω
YK2-2 (MRL+) or Y1-2 (LE+) - Body ground and other terminals	Always	10 kΩ or higher

REPLACE PARKING BRAKE WIRE ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - PARKING BRAKE ACTUATOR ASSEMBLY)

(a) Turn the power switch off.

(b) Make sure the parking brake wire assembly is securely installed.

(d) Disconnect the Y4 or Y1 parking brake actuator assembly connector.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A39-4 (MRR+) - Y4-2 (RE+)	Always	Below 1 Ω
A39-3 (MRR-) - Y4-1 (RE-)	Always	Below 1 Ω
A39-4 (MRR+) or Y4-2 (RE+) - Body ground	Always	10 kΩ or higher
A39-3 (MRR-) or Y4-1 (RE-) - Body ground	Always	10 kΩ or higher

Tester Connection	Condition	Specified Condition
A39-7 (MRL+) - Y1-2 (LE+)	Always	Below 1 Ω
A39-8 (MRL-) - Y1-1 (LE-)	Always	Below 1 Ω
A39-7 (MRL+) or Y1-2 (LE+) - Body ground	Always	10 kΩ or higher
A39-8 (MRL-) or Y1-1 (LE-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT PARKING BRAKE ACTUATOR ASSEMBLY

(a) Remove the parking brake actuator assembly.

Click here

(b) Inspect the parking brake actuator assembly.

Click here

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY

Actuator Malfunction (C13A7)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A7

Actuator Malfunction

Both of following conditions are met:

Electric parking brake is operating
One of following is detected: Motor lock, gear lock, motor spinning or repeated slipping

Parking brake actuator assembly
Rear brake
Wire harness or connector

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

DTC Detection Conditions

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4
Diagnosis Condition	Electric parking brake is operating	○	○	○	○
Malfunction Status	Motor lock is detected	○	-	-	-
	Gear lock is detected	-	○	-	-
	Motor spinning is detected	-	-	○	-
	Repeated slipping is detected	-	-	-	○
Detection Time		-	-	-	-
Number of Trips		1 trip	1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

This DTC may be stored when the system changes to pad replacement mode, but this is not a malfunction.
This DTC may be stored when the parking brake is forcibly released, but this is not a malfunction.
The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

PROCEDURE

CHECK DTC

(a) Check for DTCs.

Click here

Chassis > Electric Parking Brake > Trouble Codes

Result	Proceed to
Only DTC C13A7 is output	A
DTCs other than C13A7 are output	B

GO TO DIAGNOSTIC TROUBLE CODE CHART

2.	READ VALUE USING TECHSTREAM (PERMISSION OF RH INTERLOCKING PKB LOCK / PERMISSION OF LH INTERLOCKING PKB LOCK)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(f) Read the Data List according to the display on the Techstream.

Chassis > Electric Parking Brake > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Permission of RH Interlocking PKB Lock	Parking brake actuator assembly RH parking brake lock control permission status	OK or NG	OK	-
Permission of LH Interlocking PKB Lock	Parking brake actuator assembly RH parking brake lock control permission status	OK or NG	OK	-

Chassis > Electric Parking Brake > Data List

Tester Display
Permission of RH Interlocking PKB Lock
Permission of LH Interlocking PKB Lock

3.	INSPECT PARKING BRAKE WIRE ASSEMBLY

*A	RH	*B	LH
*a	Front view of Parking Brake Wire Assembly	*b	(to wire harness connector)
*c	(to Parking Brake Actuator Assembly)	-	-

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Inspect the parking brake wire assembly.

Standard Resistance:

Tester Connection	Condition	Specified Condition
YK1-1 (MRR-) - Y4-1 (RE-)	Always	Below 1 Ω
YK1-1 (MRR-) or Y4-1 (RE-) - Body ground and other terminals	Always	10 kΩ or higher
YK1-2 (MRR+) - Y4-2 (RE+)	Always	Below 1 Ω
YK1-2 (MRR+) or Y4-2 (RE+) - Body ground and other terminals	Always	10 kΩ or higher

Tester Connection	Condition	Specified Condition
YK2-1 (MRL-) - Y1-1 (LE-)	Always	Below 1 Ω
YK2-1 (MRL-) or Y1-1 (LE-) - Body ground and other terminals	Always	10 kΩ or higher
YK2-2 (MRL+) - Y1-2 (LE+)	Always	Below 1 Ω
YK2-2 (MRL+) or Y1-2 (LE+) - Body ground and other terminals	Always	10 kΩ or higher

REPLACE PARKING BRAKE WIRE ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - PARKING BRAKE ACTUATOR ASSEMBLY)

(a) Turn the power switch off.

(b) Make sure the parking brake wire assembly is securely installed.

(d) Disconnect the Y4 or Y1 parking brake actuator assembly connector.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A39-4 (MRR+) - Y4-2 (RE+)	Always	Below 1 Ω
A39-3 (MRR-) - Y4-1 (RE-)	Always	Below 1 Ω
A39-4 (MRR+) or Y4-2 (RE+) - Body ground	Always	10 kΩ or higher
A39-3 (MRR-) or Y4-1 (RE-) - Body ground	Always	10 kΩ or higher

Tester Connection	Condition	Specified Condition
A39-7 (MRL+) - Y1-2 (LE+)	Always	Below 1 Ω
A39-8 (MRL-) - Y1-1 (LE-)	Always	Below 1 Ω
A39-7 (MRL+) or Y1-2 (LE+) - Body ground	Always	10 kΩ or higher
A39-8 (MRL-) or Y1-1 (LE-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT REAR BRAKE AND PARKING BRAKE ACTUATOR ASSEMBLY

(a) Enter rear brake pad replacement mode.

Click here

(b) Turn the power switch off.

(1) Check that the parking brake actuator assembly is installed properly to the rear brake caliper and that it is not spinning freely.

For the parking brake actuator assembly removal procedure: Click here

(2) Check that there is no damage to the rotating parts from the parking brake actuator assembly to the rear brake caliper.

(3) Inspect the parking brake actuator assembly and check that it operates correctly.

Click here

(4) Check that the rear brake caliper threaded part rotates and that the rear disc brake piston moves outward.

HINT:

For the check procedures, refer to the parking brake forced release method when not using the Techstream.

Click here

HINT:

Return to normal mode after work is complete.

Click here

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE NECESSARY PARTS

Brake System Malfunction (C13A9)

DESCRIPTION

The parking brake ECU (brake actuator assembly) receives the wheel speed signal of each wheel from the skid control ECU (brake booster with master cylinder assembly) via CAN communication.

This DTC is stored when a malfunction occurs in the skid control ECU (brake booster with master cylinder assembly).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13A9

Brake System Malfunction

Both of following conditions are met:

Power switch on (IG)
Malfunction signal is received from skid control ECU (brake booster with master cylinder assembly) for approximately 0.3 seconds.

Skid control ECU (brake booster with master cylinder assembly)
Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

CAUTION / NOTICE / HINT

NOTICE:

PROCEDURE

1.	CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

(a) Check for DTCs.

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

2.	CHECK DTC (ELECTRIC PARKING BRAKE SYSTEM)

(a) Clear the DTCs.

Chassis > Electric Parking Brake > Clear DTCs

(b) Turn the power switch off.

Chassis > Electric Parking Brake > Trouble Codes

Result	Proceed to
DTCs are output	A
DTCs are not output	B

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

USE SIMULATION METHOD TO CHECK

EPB High Temperature (C13AA)

DESCRIPTION

If the electric parking brake is used continuously, system operation is stopped to prevent the parking brake actuator assembly from overheating.

This DTC is stored when system operation is stopped to prevent the parking brake actuator assembly from overheating and is not a malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13AA

EPB High Temperature

Both of following conditions are met:

Electric parking brake is operating
Lock and release operations are performed 10 times without 2 seconds periods of no operation; or lock and release operations are performed 5 times without 2 seconds periods of no operation, and target current is not applied during lock control

Overheat due to continuous use of system

DTC stored

A warning is displayed on the multi-information display indicating electric parking brake system operation is stopped due to high temperatures.

DTC Detection Conditions

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Electric parking brake is operating	○	○
Malfunction Status	Lock and release operations are performed without 2 seconds interval 10 times	○	-
Malfunction Status	Lock and release operations are performed without 2 seconds interval 5 times, and target current is not achieved during lock control	-	○
Detection Time		-	-
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

PROCEDURE

1.	ELECTRIC PARKING BRAKE OVERHEAT

(a) With the overheat warning displayed on the multi-information display, wait for approximately 1 minute.

(b) Check that the overheat warning has disappeared.

HINT:

Check the display after turning the power switch off and on (IG).
After the warning has disappeared and the electric parking brake system returns to normal, clear the DTCs.

Chassis > Electric Parking Brake > Clear DTCs

END

System information not received (C13AE)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13AE

System information not received

Both of following conditions are met:

Power switch on (IG)
When power switch is first turned on (IG) after parking brake ECU (brake actuator assembly) has been replaced, system cannot communicate with hybrid vehicle control ECU for approximately 4 seconds

Hybrid vehicle control ECU
CAN communication system
Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

CAUTION / NOTICE / HINT

NOTICE:

PROCEDURE

CHECK DTC

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Check for DTC.

Chassis > Electric Parking Brake > Trouble Codes

Result	Proceed to
DTC C13AE and a CAN DTC are output at the same time	A
DTC C13AE is output and the MIL is illuminated	B
Only DTC C13AE is output	C
DTCs are not output	D

GO TO CAN COMMUNICATION SYSTEM

GO TO HYBRID CONTROL SYSTEM

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

USE SIMULATION METHOD TO CHECK

EPB Switch Malfunction (C13B4)

DESCRIPTION

When the electric parking brake switch is pulled, a lock request signal is sent from the parking brake ECU (brake actuator assembly) to the parking brake actuator assembly. When the electric parking brake switch is pushed, a release request signal is sent from the parking brake ECU (brake actuator assembly) to the parking brake actuator assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
C13B4	EPB Switch Malfunction	Parking brake switch open or short circuit is detected for 1 second or more Parking brake switch stuck malfunction	Electric parking brake switch (electric parking brake switch assembly) Wire harness or connector Parking brake ECU (brake actuator assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

DTC Detection Conditions

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	-	-	-
Malfunction Status	Parking brake switch open or short circuit is detected	○	-
Malfunction Status	Parking brake switch stuck malfunction	-	○
Detection Time		1 second or more	-
Number of Trips		1 trip	1 trip

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

PROCEDURE

1.	INSPECT ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(a) Inspect the electric parking brake switch (electric parking brake switch assembly).

Click here

REPLACE ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

2.	CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY))

(a) Disconnect the G24 electric parking brake switch (electric parking brake switch assembly) connector.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A39-14 (SWI1) - G24-9 (SWI1)	Always	Below 1 Ω
A39-20 (SWO1) - G24-10 (SWO1)	Always	Below 1 Ω
A39-24 (SWI2) - G24-1 (SWI2)	Always	Below 1 Ω
A39-22 (SWO2) - G24-2 (SWO2)	Always	Below 1 Ω
A39-14 (SWI1) or G24-9 (SWI1) - Body ground	Always	10 kΩ or higher
A39-20 (SWO1) or G24-10 (SWO1) - Body ground	Always	10 kΩ or higher
A39-24 (SWI2) or G24-1 (SWI2) - Body ground	Always	10 kΩ or higher
A39-22 (SWO2) or G24-2 (SWO2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK DTC

(a) Clear the DTCs.

Chassis > Electric Parking Brake > Clear DTCs

(b) Turn the power switch off.

(d) Check for DTCs.

Chassis > Electric Parking Brake > Trouble Codes

Result	Proceed to
DTCs are output	A
DTCs are not output	B

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

USE SIMULATION METHOD TO CHECK

Deceleration Sensor (C1245)

DESCRIPTION

The parking brake ECU (brake actuator assembly) receives vehicle tilt angle information from the deceleration sensor (airbag ECU assembly) via CAN communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C1245

Deceleration Sensor

One of following conditions is met:

An error signal is sent from deceleration sensor (airbag ECU assembly) for approximately 0.3 seconds.
While the deceleration sensor (airbag ECU assembly) signal is judged to be stuck, starting off and stopping of vehicle occurs 16 times.
Comparison error between deceleration sensor (airbag ECU assembly) 1 and deceleration sensor (airbag ECU assembly) 2 output values occurs for 60 seconds or more.

Deceleration sensor (Airbag ECU assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

DTC Detection Conditions

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	Power switch on (IG)	○	○	○
Malfunction Status	An error signal is sent from the deceleration sensor (airbag ECU assembly)	○	-	-
	While the deceleration sensor (airbag ECU assembly) signal is judged to be stuck, starting off and stopping the vehicle occurs 16 times	-	○	-
	Comparison error between deceleration sensor (airbag ECU assembly) 1 and deceleration sensor (airbag ECU assembly) 2 output values occurs	-	-	○
Detection Time		Approximately 0.3 seconds	-	60 seconds or more
Number of Trips		1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

When replacing the deceleration sensor (airbag ECU assembly), perform initialization and calibration of the linear solenoid valve.

Click here

PROCEDURE

1.	CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

(a) Check for DTCs.

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC is not output	A
DTC is output	B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

2.	CHECK DTC (ELECTRIC PARKING BRAKE SYSTEM)

(a) Clear the DTCs.

Chassis > Electric Parking Brake > Clear DTCs

(b) Turn the power switch off.

Chassis > Electric Parking Brake > Trouble Codes

Result	Proceed to
DTCs are output	A
DTCs are not output	B

REPLACE AIRBAG ECU ASSEMBLY

USE SIMULATION METHOD TO CHECK

Data List / Active Test

DATA LIST / ACTIVE TEST

READ DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(f) Read the Data List according to the display on the Techstream.

Chassis > Electric Parking Brake > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Number of Trouble Codes	Number of DTCs stored	0 to 255	0	-
FR Speed Sensor Open	Front speed sensor RH open detection	Normal or Error	Normal	-
FL Speed Sensor Open	Front speed sensor LH open detection	Normal or Error	Normal	-
RR Speed Sensor Open	Rear speed sensor RH open detection	Normal or Error	Normal	-
RL Speed Sensor Open	Rear speed sensor LH open detection	Normal or Error	Normal	-
EFI ECU Communication Open	ECM communication open detection	Normal or Error	Normal	-
Deceleration Sensor Open	Deceleration sensor (airbag ECU assembly) communication open detection	Normal or Error	Normal	-
HV ECU Communication Open	Hybrid vehicle control ECU communication open detection	Normal or Error	Normal	-
Body ECU Communication Open	Main body ECU (multiplex network body ECU) communication open detection	Normal or Error	Normal	-
Brake ECU Communication Open	Skid control ECU (brake booster with master cylinder assembly) communication open detection	Normal or Error	Normal	-
A/C ECU Communication Open	Air conditioning amplifier assembly communication open detection	Normal or Error	Normal	-
Navigation ECU Communication Open	Radio receiver assembly communication open detection	Normal or Error	Normal	-
Stop and Start ECU Communication Open	Engine stop and start ECU communication open detection	Normal or Error	Normal	This item is displayed on the Techstream but is not used
Deceleration Sensor Open (EPB)	Deceleration sensor (airbag ECU assembly) communication open detection	Normal or Error	Normal	HINT: EPB stands for electric parking brake.
FR Wheel Speed	Front wheel speed sensor RH reading	0.0 to 326.4 km/h (0.0 to 202.8 mph)	When vehicle is stopped: 0.0 km/h (0.0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, front speed sensor RH system and CAN communication may be malfunctioning
FL Wheel Speed	Front wheel speed sensor LH reading	0.0 to 326.4 km/h (0.0 to 202.8 mph)	When vehicle is stopped: 0.0 km/h (0.0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, front speed sensor LH system and CAN communication may be malfunctioning
RR Wheel Speed	Rear wheel speed sensor RH reading	0.0 to 326.4 km/h (0.0 to 202.8 mph)	When vehicle is stopped: 0.0 km/h (0.0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, rear speed sensor RH system and CAN communication may be malfunctioning
RL Wheel Speed	Rear wheel speed sensor LH reading	0.0 to 326.4 km/h (0.0 to 202.8 mph)	When vehicle is stopped: 0.0 km/h (0.0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, rear speed sensor LH system and CAN communication may be malfunctioning
Deceleration Sensor 1	Deceleration sensor (airbag ECU assembly) 1 input signal	-18.300 to 18.318 m/s2	When vehicle is stopped: 0.000 m/s2 When driving vehicle: Continuously changes	When not normal, deceleration sensor (airbag ECU assembly) system and CAN communication may be malfunctioning
Deceleration Sensor 2	Deceleration sensor (airbag ECU assembly) 2 input signal	-18.300 to 18.318 m/s2	When vehicle is stopped: 0.000 m/s2 When driving vehicle: Continuously changes	When not normal, deceleration sensor (airbag ECU assembly) system and CAN communication may be malfunctioning
Forward and Rearward G	Deceleration sensor (airbag ECU assembly) input signal	-18.300 to 18.318 m/s2	When vehicle is stopped: 0.000 m/s2 When driving vehicle: Changes according to increase or decrease in speed	When not normal, deceleration sensor (airbag ECU assembly) system and CAN communication may be malfunctioning
Zero Point of Deceleration Sensor	Deceleration sensor (airbag ECU assembly) zero point	-4.595 to 4.559 m/s2	-	-
Zero Point of Deceleration Sensor 2	Deceleration sensor (airbag ECU assembly) 2 zero point	-4.595 to 4.559 m/s2	-	-
Vehicle Speed	Vehicle speed	0.0 to 326.4 km/h (0.0 to 202.8 mph)	When vehicle is stopped: 0.0 km/h (0.0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, speed sensor system and CAN communication may be malfunctioning
ECU +B1 Voltage	Skid control ECU (brake booster with master cylinder assembly) +B1 voltage	0.00 to 20.00 V	11 to 14 V	-
ECU +B2 Voltage	Skid control ECU (brake booster with master cylinder assembly) +B2 voltage	0.00 to 20.00 V	11 to 14 V	-
RH Actuator Motor +Terminal Voltage	Parking brake motor RH (parking brake actuator assembly RH) positive (+) terminal side voltage	0.00 to 20.00 V	-	-
RH Actuator Motor -Terminal Voltage	Parking brake motor RH (parking brake actuator assembly RH) negative (-) terminal side voltage	0.00 to 20.00 V	-	-
LH Actuator Motor +Terminal Voltage	Parking brake motor LH (parking brake actuator assembly LH) positive (+) terminal side voltage	0.00 to 20.00 V	-	-
LH Actuator Motor -Terminal Voltage	Parking brake motor LH (parking brake actuator assembly LH) negative (-) terminal side voltage	0.00 to 20.00 V	-	-
Indoor Temperature	Interior temperature	-6.50 to 57.25°C (20.3 to 135°F)	-	When displayed value differs from actual interior temperature, air conditioning system and CAN communication system may be malfunctioning
Ambient Temperature	Ambient temperature	-40 to 50°C (-40 to 122°F)	-	When displayed value differs from actual ambient temperature, air conditioning system and CAN communication system may be malfunctioning
Stop Light Switch	Stop light switch assembly input signal	OFF or ON	OFF: Brake pedal released ON: Brake pedal depressed	-
EPB Switch	Electric parking brake switch (electric parking brake switch assembly) input	OFF, Lock, Release or Unknown	OFF: Lock switch and release switch are off Lock: Lock switch on Release: Release switch on	When not normal, electric parking brake switch (electric parking brake switch assembly) release side system may be malfunctioning HINT: EPB stands for electric parking brake.
Auto Mode Request	Auto mode request status	OFF or ON	-	-
Shift Position	Position of shift lever	P, N, R, D or Unknown	P: Shift lever in P N: Shift lever in N R: Shift lever in R D: Shift lever in D or S	When not normal, shift position signal system may be malfunctioning
IG Switch	IG power source status	OFF or ON	OFF: IG power source voltage is not input to skid control ECU (brake booster with master cylinder assembly) ON: IG power source voltage is input to skid control ECU (brake booster with master cylinder assembly)	-
Brake Hold Ready	Brake hold control permission status	OFF or ON	-	-
Brake Hold Control Mode	Brake hold control mode	OFF, ON, Release or EPB	OFF: Brake hold control is not operating ON: Brake hold control is operating Release: Brake hold control is released EPB: Parking brake is locked during brake hold control	HINT: EPB stands for electric parking brake.
EPB Lock Request	Lock demand status	OFF or ON	OFF: Not requested ON: Requested	HINT: EPB stands for electric parking brake.
FR Speed Signal Status	FR speed signal status	Normal or Stuck	Normal	-
FL Speed Signal Status	FL speed signal status	Normal or Stuck	Normal	-
RR Speed Signal Status	RR speed signal status	Normal or Stuck	Normal	-
RL Speed Signal Status	RL speed signal status	Normal or Stuck	Normal	-
RH Actuator Current Status	Parking brake actuator assembly RH monitoring current condition	Valid or Inval	Valid	-
LH Actuator Current Status	Parking brake actuator assembly LH monitoring current condition	Valid or Inval	Valid	-
RH Actuator Nut Stroke	Parking brake actuator assembly RH nut stroke value	0.000 to 8.160 mm (0.000 to 0.321 in.)	-	-
LH Actuator Nut Stroke	Parking brake actuator assembly LH nut stroke value	0.000 to 8.160 mm (0.000 to 0.321 in.)	-	-
RH Actuator Motor Actual Current	Parking brake motor RH (parking brake actuator assembly RH) current value	-5.0362 to 50.5000 A	-	-
RH Actuator Motor Adjustment Current	Parking brake motor RH (parking brake actuator assembly RH) current calibration value	-6.9690 to 6.9140 A	-	-
RH Actuator 0 load Current	Parking brake actuator assembly RH current value with no load	-5.0362 to 50.5000 A	-	-
LH Actuator Motor Actual Current	Parking brake motor LH (parking brake actuator assembly LH) current value	-5.0362 to 50.5000 A	-	-
LH Actuator Motor Adjustment Current	Parking brake motor LH (parking brake actuator assembly LH) current calibration value	-6.9690 to 6.9140 A	-	-
LH Actuator 0 load Current	Parking brake actuator assembly LH current value with no load	-5.0362 to 50.5000 A	-	-
Counter of IG ON After EPB Control Cancel	Number of times the power switch was turned on (IG) after EPB control was canceled	0 to 255 Times	-	HINT: EPB stands for electric parking brake.
RH Actuator Status	Parking brake actuator assembly RH condition	Default, Lock, Lock Dynamic, Release, Lock Faulty, Unexpected, Lock Standby, Release Standby, Lock Dynamic Standby, Release Dynamic Standby, Lock Dynamic Faulty, Lock Standard Control, Lock Dynamic Control, Lock Control for Prevention Loosen by High Temperature, Lock Control for Prevention Slipping Down, Re-Lock Control by Switch, Recovery Lock Control, Lock Control After Dynamic PKB, Release Standard Control, Release Dynamic Control or Full Release Control	-	-
LH Actuator Status	Parking brake actuator assembly LH condition	Default, Lock, Lock Dynamic, Release, Lock Faulty, Unexpected, Lock Standby, Release Standby, Lock Dynamic Standby, Release Dynamic Standby, Lock Dynamic Faulty, Lock Standard Control, Lock Dynamic Control, Lock Control for Prevention Loosen by High Temperature, Lock Control for Prevention Slipping Down, Re-Lock Control by Switch, Recovery Lock Control, Lock Control After Dynamic PKB, Release Standard Control, Release Dynamic Control or Full Release Control	-	-
RH Actuator Motor Current Differential	Differences in parking brake motor RH (parking brake actuator assembly RH) monitoring current	-1.008 to 0.945 A	-	-
LH Actuator Motor Current Differential	Differences in parking brake motor LH (parking brake actuator assembly LH) monitoring current	-1.008 to 0.945 A	-	-
Auto Mode	AUTO (shift-linked) mode permission status	OFF or ON	OFF: Manual mode ON: AUTO (shift-linked) mode	-
Dynamic PKB Mode	Dynamic parking brake operation status	OFF or ON	OFF: Dynamic parking brake is not operating ON: Dynamic parking brake is operating	-
Permission of Interlocking Shift	AUTO (shift-linked) mode permission status	OK or NG	-	-
Permission of Interlocking Brake	Brake-linked permission status	OK or NG	-	-
Permission of RH Interlocking PKB Lock	Parking brake actuator assembly RH parking brake lock control permission status	OK or NG	OK	-
Permission of RH Interlocking PKB Release	Parking brake actuator assembly RH parking brake release control permission status	OK or NG	-	-
Permission of RH Interlocking Dynamic PKB	Parking brake actuator assembly RH dynamic parking control permission status	OK or NG	-	-
Permission of RH Interlocking PKB Full Release	Parking brake actuator assembly RH parking brake full release permission status	OK or NG	-	-
Permission of LH Interlocking PKB Lock	Parking brake actuator assembly RH parking brake lock control permission status	OK or NG	OK	-
Permission of LH Interlocking PKB Release	Parking brake actuator assembly RH parking brake release control permission status	OK or NG	-	-
Permission of LH Interlocking Dynamic PKB	Parking brake actuator assembly RH dynamic parking control permission status	OK or NG	-	-
Permission of LH Interlocking PKB Full Release	Parking brake actuator assembly LH parking brake full release permission status	OK or NG	-	-
Fade Status	Fade status	OFF or ON	-	-
EPB Control Cancel History	Cause of EPB control cancel	No Recoded, RH IC Overheat, LH IC Overheat, RH Actuator Motor Current High, LH Actuator Motor Current High, RH Actuator Motor +B Open Judging, LH Actuator Motor +B Open Judging or IG Voltage High/Low	-	HINT: EPB stands for electric parking brake.
Parking Brake Light	Parking brake indicator light (red) output signal	OFF, Light or Blink	OFF: Parking brake indicator light (red) turns off Light: Parking brake indicator light (red) illuminates Blink: Parking brake indicator light (red) flashes	-
EPB Warning Light	Brake system warning light (yellow indicator) output signal	OFF or ON	OFF: Brake system warning light (yellow indicator) turns off ON: Brake system warning light (yellow indicator) illuminates	-
AUTO Indicator	AUTO indicator light output signal	OFF or ON	-	This item is displayed on the Techstream, however, it is not used for this vehicle

PERFORM ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Active Test.

(f) According to the display on the Techstream, perform the Active Test.

Chassis > Electric Parking Brake > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Auto Mode	AUTO (shift-linked) mode	ON or OFF	Vehicle stopped Power switch on (IG)
EPB Warning Light	Brake system warning light (yellow)	ON or OFF	Vehicle stopped Power switch on (IG) HINT: EPB stands for electric parking brake.
PKB Light	Parking brake indicator light (red)	ON or OFF	Vehicle stopped Power switch on (IG)
PKB Lock Control	Parking brake lock control	ON or OFF	Vehicle stopped Power switch on (IG)
PKB Release Control	Parking brake release control	ON or OFF	Vehicle stopped Power switch on (IG)
PKB Full Release Control	Parking brake full release control	ON or OFF	Vehicle stopped Power switch on (IG)

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Electric Parking Brake System

DTC No.	Detection Item	Memory	Note
C1245	Deceleration Sensor	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13A0	Open circuit in Power source circuit	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13A1	Short circuit in Power source circuit	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13A2	Engine Switch/Power Switch Malfunction	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13A5	Electric Current of Motor	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13A6	Open or Short Circuit in Motor	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13A7	Actuator Malfunction	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13A9	Brake System Malfunction	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13AA	EPB High Temperature	DTC stored	A warning is displayed on the multi-information display indicating electric parking brake system operation is stopped due to high temperatures.
C13AE	System information not received	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13B0	Electric Parking Brake ECU Malfunction	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
C13B4	EPB Switch Malfunction	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0073	Control Module Communication Bus OFF	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0100	Lost Communication With ECM/PCM "A"	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0124	Lost Communication With Lateral Acceleration Sensor Module	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0129	Lost Communication with Brake System Control Module	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0293	Lost Communication With Hybrid Vehicle Control System	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

Dtc Check / Clear

DTC CHECK / CLEAR

CHECK DTC AND FREEZE FRAME DATA (USING TECHSTREAM)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Trouble Codes.

Chassis > Electric Parking Brake > Trouble Codes

(f) Check for DTCs.

(g) Check the freeze frame data.

If DTCs are output, check the freeze frame data and read the vehicle status when the DTC was stored.

HINT:

for Freeze Frame Data: Click here

CLEAR DTC AND FREEZE FRAME DATA (USING TECHSTREAM)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Trouble Codes.

(f) Clear the DTCs.

Chassis > Electric Parking Brake > Clear DTCs

HINT:

When DTCs are cleared, the freeze frame data will also be cleared.

Electric Parking Brake does not Operate

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

HINT:

Even if the electric parking brake is operating normally, the parking brake indicator light (red) on the combination meter may be malfunctioning.

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output.

Click here

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

2.	VEHICLE OPERATION CHECK

(a) When the vehicle's tires are lifted off the ground and the Techstream is used to operate the electric parking brake, check the condition of the rear tires.

Click here

Result	Proceed to
Lock and release operation is normal and parking brake indicator light turns off or blinks (red)	A
Lock and release operation is malfunctioning and parking brake indicator light illuminates (red) or turns off according to switch operation	B
Lock and release operation is malfunctioning and parking brake indicator light turns off or blinks (red)	C

INSPECT REAR BRAKE

GO TO STEP 5

3.	PERFORM TECHSTREAM (PARKING BRAKE LIGHT)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Active Test.

(f) Perform the Active Test according to the display on the Techstream.

Chassis > Electric Parking Brake > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
PKB Light	Parking brake indicator light (red)	ON or OFF	Vehicle stopped Power switch on (IG)

Chassis > Electric Parking Brake > Active Test

Tester Display
PKB Light

(g) Select the Data List on the Techstream.

Chassis > Electric Parking Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Parking Brake Light

Parking brake indicator light (red) output signal

OFF, Light or Blink

OFF: Parking brake indicator light (red) turns off

Light: Parking brake indicator light (red) illuminates

Blink: Parking brake indicator light (red) flashes

Chassis > Electric Parking Brake > Data List

Tester Display
Parking Brake Light

(h) Check the operating condition of the parking brake indicator light (red) when operating it using the Techstream.

Result	Proceed to
The value of the Data List item does not change in accordance with the Active Test	A
The value of the Data List item changes in accordance with the Active Test	B

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

4.	INSPECT COMBINATION METER ASSEMBLY

(a) Perform the Active Test of the combination meter assembly using the Techstream.

Body Electrical > Combination Meter > Active Test

Tester Display
Indicat. Park

(b) Check the combination meter assembly.

OK:

Parking brake indicator light (red) turns on or off in accordance with Techstream operation.

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

GO TO METER / GAUGE SYSTEM

5.	CHECK HARNESS AND CONNECTOR (BEPB CIRCUIT)

*a	Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly))

(a) Turn the power switch off.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A39-9 (BEPB) - Body ground	Power switch off	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY))

*a	Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly))

(a) Turn the power switch off.

(b) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A39-26 (IG) - Body ground	Power switch on (IG)	8 to 16 V

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

The parking brake ECU (brake actuator assembly) receives shift position information from the hybrid vehicle control ECU via CAN communication, and wheel speed signal and stop light switch signals from the skid control ECU (brake booster with master cylinder assembly).

The electric parking brake system AUTO function (shift-linked function) automatically releases the parking brake when the following conditions are met: 1) Power switch is on (IG), 2) brake pedal is depressed, and 3) shift lever is moved out of P. When the shift lever is moved to P with these conditions met, the function automatically locks the parking brake.

The electric parking brake system AUTO (shift-linked function) automatically engages the parking brake when the shift lever is moved to P and disengages the parking brake when the shift lever is moved out of P when the power switch is on (IG) and the brake pedal is depressed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

PROCEDURE

1.	CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

(a) Check for DTCs.

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC is not output	A
DTC is output	B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

2.	CHECK DTC (HYBRID CONTROL SYSTEM)

(a) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
DTC is not output	A
DTC is output	B

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

GO TO HYBRID CONTROL SYSTEM

Fail-safe Chart

FAIL-SAFE CHART

DTC	Trouble Area	Brake System Warning Light (Yellow)	Parking Brake Indicator Light (Red)	Fail-safe Deactivation Condition
C1245	Deceleration sensor data malfunction	Illuminates	Normal	20 seconds after power switch turned off
C13A0	Open in power supply relay circuit	Illuminates	Normal*	20 seconds after power switch turned off
C13A1	Short in power supply relay circuit	Illuminates	Normal	20 seconds after power switch turned off
C13A2	Power switch malfunction	Illuminates	Normal	20 seconds after power switch turned off
C13A5	Parking brake motor (Parking brake actuator assembly) current monitor malfunction	Illuminates	Normal*	20 seconds after power switch turned off
C13A6	Parking brake motor (Parking brake actuator assembly) open or short malfunction	Illuminates	Normal*	20 seconds after power switch turned off
C13A7	Parking brake actuator assembly malfunction (jamming, spinning, repeated slipping)	Illuminates	Normal*	Parking brake actuator assembly normal
C13A9	Brake Control System Malfunction	Illuminates	Normal	Wheel speed of 1 wheel or more received normally
C13AA	Electric parking brake high temperature	Does not illuminate	Blinks	Wait 1 minute
C13AE	System information not received malfunction	Illuminates	Normal	System information received
C13B0	ECU malfunction	Illuminates	Normal*	Parking brake ECU (brake actuator assembly) normal
C13B4	Electric parking brake switch open or short circuit malfunction	Illuminates	Blinks	After returning to normal condition, turn power switch again
U0073	CAN communication system malfunction	Illuminates	Normal	Power switch off
U0100	SFI system communication malfunction	Illuminates	Normal	Communication normal, power switch off
U0124	Deceleration sensor communication malfunction	Illuminates	Normal	Communication normal, power switch off
U0129	Brake system communication malfunction	Illuminates	Normal	Communication normal, power switch off
U0293	Hybrid vehicle control ECU communication malfunction	Illuminates	Normal	Communication normal, power switch off

*: The parking brake indicator light blinks (red) if the electric parking brake switch assembly is pulled or pushed.

Freeze Frame Data

FREEZE FRAME DATA

FREEZE FRAME DATA

HINT:

When a DTC is stored, the freeze frame data stores the current vehicle (sensor) state as.
The freeze frame data cannot be cleared or updated until the recorded DTCs are cleared.

(a) Using the Techstream, the state of the vehicle (sensors) when the system is operating or when a DTC was stored can be checked.

Chassis > Electric Parking Brake

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Speed Sensor Open	Front speed sensor RH open detection	Normal or Error	Normal	-
FL Speed Sensor Open	Front speed sensor LH open detection	Normal or Error	Normal	-
RR Speed Sensor Open	Rear speed sensor RH open detection	Normal or Error	Normal	-
RL Speed Sensor Open	Rear speed sensor LH open detection	Normal or Error	Normal	-
EFI ECU Communication Open	ECM communication open detection	Normal or Error	Normal	-
Deceleration Sensor Open	Deceleration sensor (airbag ECU assembly) communication open detection	Normal or Error	Normal	-
HV ECU Communication Open	Hybrid vehicle control ECU communication open detection	Normal or Error	Normal	-
Body ECU Communication Open	Main body ECU (multiplex network body ECU) communication open detection	Normal or Error	Normal	-
Brake ECU Communication Open	Skid control ECU (brake booster with master cylinder assembly) communication open detection	Normal or Error	Normal	-
A/C ECU Communication Open	Air conditioning amplifier assembly communication open detection	Normal or Error	Normal	-
Navigation ECU Communication Open	Radio receiver assembly communication open detection	Normal or Error	Normal	-
Stop and Start ECU Communication Open	Engine stop and start ECU communication open detection	Normal or Error	Normal	-
Deceleration Sensor Open (EPB)	Acceleration sensor open detection	Normal or Error	Normal	HINT: EPB stands for electric parking brake.
FR Wheel Speed	Front wheel speed sensor RH reading	0.0 to 326.4 km/h (0 to 202 mph)	When vehicle is stopped: 0 km/h (0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, front speed sensor RH system and CAN communication may be malfunctioning
FL Wheel Speed	Front wheel speed sensor LH reading	0.0 to 326.4 km/h (0 to 202 mph)	When vehicle is stopped: 0 km/h (0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, front speed sensor LH system and CAN communication may be malfunctioning
RR Wheel Speed	Rear wheel speed sensor RH reading	0.0 to 326.4 km/h (0 to 202 mph)	When vehicle is stopped: 0 km/h (0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, rear speed sensor RH system and CAN communication may be malfunctioning
RL Wheel Speed	Rear wheel speed sensor LH reading	0.0 to 326.4 km/h (0 to 202 mph)	When vehicle is stopped: 0 km/h (0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, rear speed sensor LH system and CAN communication may be malfunctioning
Deceleration Sensor 1	Deceleration sensor (airbag ECU assembly) 1 input signal	-18.300 to 18.318 m/s2	When vehicle is stopped: 0 m/s2 When driving vehicle: Continuously changes	When not normal, deceleration sensor (airbag ECU assembly) system and CAN communication may be malfunctioning
Deceleration Sensor 2	Deceleration sensor (airbag ECU assembly) 2 input signal	-18.300 to 18.318 m/s2	When vehicle is stopped: 0 m/s2 When driving vehicle: Continuously changes	When not normal, deceleration sensor (airbag ECU assembly) system and CAN communication may be malfunctioning
Forward and Rearward G	Deceleration sensor (airbag ECU assembly) input signal	-18.300 to 18.318 m/s2	When vehicle is stopped: 0 m/s2 When driving vehicle: Changes according to increase or decrease in speed	When not normal, deceleration sensor (airbag ECU assembly) system and CAN communication may be malfunctioning
Zero Point of Deceleration Sensor	Deceleration sensor (airbag ECU assembly) zero point	-4.595 to 4.559 m/s2	-	-
Zero Point of Deceleration Sensor 2	Deceleration sensor (airbag ECU assembly) 2 zero point	-4.595 to 4.559 m/s2	-	-
Vehicle Speed	Vehicle speed	0.0 to 326.4 km/h (0.0 to 202.8 mph)	When vehicle is stopped: 0 km/h (0 mph) When driving vehicle: Changes according to vehicle speed (when vehicle speed is constant, there are no big changes in vehicle speed display)	When not normal, speed sensor system and CAN communication may be malfunctioning
ECU +B1 Voltage	Skid control ECU (brake booster with master cylinder assembly) +B1 voltage	0.00 to 20.00 V	11 to 14 V	-
ECU +B2 Voltage	Skid control ECU (brake booster with master cylinder assembly) +B2 voltage	0.00 to 20.00 V	11 to 14 V	-
RH Actuator Motor +Terminal Voltage	Parking brake motor RH (parking brake actuator assembly RH) positive (+) terminal side voltage	0.00 to 20.00 V	-	-
RH Actuator Motor -Terminal Voltage	Parking brake motor RH (parking brake actuator assembly RH) negative (-) terminal side voltage	0.00 to 20.00 V	-	-
LH Actuator Motor +Terminal Voltage	Parking brake motor LH (parking brake actuator assembly LH) positive (+) terminal side voltage	0.00 to 20.00 V	-	-
LH Actuator Motor -Terminal Voltage	Parking brake motor LH (parking brake actuator assembly LH) negative (-) terminal side voltage	0.00 to 20.00 V	-	-
Stop Light Switch	Stop light switch assembly	OFF or ON	OFF: Brake pedal released ON: Brake pedal depressed	-
EPB Switch	Electric parking brake switch (electric parking brake switch assembly) input	OFF, Lock, Release or Unknown	OFF: Lock switch and release switch are off Lock: Lock switch on Release: Release switch on	When not normal, electric parking brake switch (electric parking brake switch assembly) release side system may be malfunctioning HINT: EPB stands for electric parking brake.
Auto Mode Request	Auto mode request status	OFF or ON	-	-
Shift Position	Position of shift lever	P, N, R, D or Unknown	P: Shift lever in P N: Shift lever in N R: Shift lever in R D: Shift lever in D or S	When not normal, shift position signal system may be malfunctioning
IG Switch	IG power source status	OFF or ON	OFF: IG power source voltage is not input to Parking brake ECU (brake actuator assembly) ON: IG power source voltage is input to Parking brake ECU (brake actuator assembly)	-
Brake Hold Ready	Brake hold control permission status	OFF or ON	-	-
Brake Hold Control Mode	Brake hold control mode	OFF, ON, Release or EPB	OFF: Brake hold control is not operating ON: Brake hold control is operating Release: Brake hold control is released EPB: Parking brake is locked during brake hold control	HINT: EPB stands for electric parking brake.
EPB Lock Request	Lock demand status	OFF or ON	OFF: Not requested ON: Requested	HINT: EPB stands for electric parking brake.
FR Speed Signal Status	FR speed signal status	Normal or Stuck	Normal	-
FL Speed Signal Status	FL speed signal status	Normal or Stuck	Normal	-
RR Speed Signal Status	RR speed signal status	Normal or Stuck	Normal	-
RL Speed Signal Status	RL speed signal status	Normal or Stuck	Normal	-
RH Actuator Current Status	Parking brake actuator assembly RH monitoring current condition	Valid or Inval	Valid	-
LH Actuator Current Status	Parking brake actuator assembly LH monitoring current condition	Valid or Inval	Valid	-
RH Actuator Nut Stroke	Parking brake actuator assembly RH nut stroke value	0.000 to 8.160 mm (0.000 to 0.321 in.)	-	-
LH Actuator Nut Stroke	Parking brake actuator assembly LH nut stroke value	0.000 to 8.160 mm (0.000 to 0.321 in.)	-	-
RH Actuator Motor Actual Current	Parking brake motor RH (parking brake actuator assembly RH) current value	-5.0362 to 50.5000 A	-	-
RH Actuator Motor Adjustment Current	Parking brake motor RH (parking brake actuator assembly RH) current calibration value	-6.9690 to 6.9140 A	-	-
RH Actuator 0 load Current	Parking brake actuator assembly RH current value with no load	-5.0362 to 50.5000 A	-	-
LH Actuator Motor Actual Current	Parking brake motor LH (parking brake actuator assembly LH) current value	-5.0362 to 50.5000 A	-	-
LH Actuator Motor Adjustment Current	Parking brake motor LH (parking brake actuator assembly LH) current calibration value	-6.9690 to 6.9140 A	-	-
LH Actuator 0 load Current	Parking brake actuator assembly LH current value with no load	-5.0362 to 50.5000 A	-	-
Counter of IG ON After EPB Control Cancel	Number of times the power switch was turned on (IG) after EPB control was canceled	0 to 255 Times	-	HINT: EPB stands for electric parking brake.
RH Actuator Status	Parking brake actuator assembly RH condition	Default, Lock, Lock Dynamic, Release, Lock Faulty, Unexpected, Lock Standby, Release Standby, Lock Dynamic Standby, Release Dynamic Standby, Lock Dynamic Faulty, Lock Standard Control, Lock Dynamic Control, Lock Control for Prevention Loosen by High Temperature, Lock Control for Prevention Slipping Down, Re-Lock Control by Switch, Recovery Lock Control, Lock Control After Dynamic PKB, Release Standard Control, Release Dynamic Control or Full Release Control	-	-
LH Actuator Status	Parking brake actuator assembly LH condition	Default, Lock, Lock Dynamic, Release, Lock Faulty, Unexpected, Lock Standby, Release Standby, Lock Dynamic Standby, Release Dynamic Standby, Lock Dynamic Faulty, Lock Standard Control, Lock Dynamic Control, Lock Control for Prevention Loosen by High Temperature, Lock Control for Prevention Slipping Down, Re-Lock Control by Switch, Recovery Lock Control, Lock Control After Dynamic PKB, Release Standard Control, Release Dynamic Control or Full Release Control	-	-
RH Actuator Motor Current Differential	Differences in parking brake motor RH (parking brake actuator assembly RH) monitoring current	-1.008 to 0.945 A	-	-
LH Actuator Motor Current Differential	Differences in parking brake motor LH (parking brake actuator assembly LH) monitoring current	-1.008 to 0.945 A	-	-
Detailed Freeze DTC	Number of detailed freeze DTCs	0 to 65535	-	-
RH Actuator Motor Gradient Current	Parking brake motor RH (parking brake actuator assembly RH) current gradient	-5.0362 to 50.5000 A	-	-
LH Actuator Motor Gradient Current	Parking brake motor LH (parking brake actuator assembly LH) current gradient	-5.0362 to 50.5000 A	-	-
RH Actuator Motor Relay1	Parking brake motor relay 1 RH condition	OFF or ON	-	-
RH Actuator Motor Relay2	Parking brake motor relay 2 RH condition	OFF or ON	-	-
RH Actuator Motor Relay3	Parking brake motor relay 3 RH condition	OFF or ON	-	-
RH Actuator Motor Relay4	Parking brake motor relay 4 RH condition	OFF or ON	-	-
LH Actuator Motor Relay1	Parking brake motor relay 1 LH condition	OFF or ON	-	-
LH Actuator Motor Relay2	Parking brake motor relay 2 LH condition	OFF or ON	-	-
LH Actuator Motor Relay3	Parking brake motor relay 3 LH condition	OFF or ON	-	-
LH Actuator Motor Relay4	Parking brake motor relay 4 LH condition	OFF or ON	-	-
RH Actuator Motor Current High	Parking brake motor RH (parking brake actuator assembly RH) overcurrent	OFF or ON	-	-
RH Actuator Motor Driver Operation Status	Parking brake motor RH (parking brake actuator assembly RH) driver status	OK or NG	-	-
LH Actuator Motor Current High	Parking brake motor LH (parking brake actuator assembly LH) overcurrent status	OFF or ON	-	-
LH Actuator Motor Driver Operation Status	Parking brake motor LH (parking brake actuator assembly LH) driver status	OK or NG	-	-

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

(a) Interview the customer and confirm the problem.

Click here

3.	INSPECT AUXILIARY BATTERY VOLTAGE

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.

4.	CHECK DTC AND FREEZE FRAME DATA*

(a) Check and record DTCs and freeze frame data.

Chassis > Electric Parking Brake > Trouble Codes

(b) Clear the DTCs and freeze frame data.

Chassis > Electric Parking Brake > Clear DTCs

(1) Reconfirm the DTCs based on the recorded DTCs and freeze frame data.

Chassis > Electric Parking Brake > Trouble Codes

(2) Try to reproduce the problem symptoms based on the recorded DTCs and freeze frame data, and then check if the DTCs are output again.

Result	Proceed to
DTCs are not output (Problem symptom occurs.)	A
DTCs are output	B
DTCs are not output (Problem symptom does not occur.)	C

HINT:

Refer to Diagnostic Trouble Code Chart if any DTCs are output.
When DTCs indicating a CAN communication system malfunction are output, first troubleshoot and repair the CAN communication system.

GO TO DIAGNOSTIC TROUBLE CODE CHART

USE SIMULATION METHOD TO CHECK

5.	PROBLEM SYMPTOMS TABLE

(a) Proceed to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table	A
Fault is listed in Problem Symptoms Table	B

GO TO STEP 7

6.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Refer to Terminals of ECU.

Click here

(b) Refer to Data List / Active Test.

Click here

7.	REPAIR OR REPLACE

8.	CONFIRMATION TEST

END

Message Not Displayed on Multi-information Display When AUTO Function Set to ON/OFF

DESCRIPTION

When the AUTO function is set to ON/OFF, a message is displayed on the multi-information display in the combination meter assembly.

WIRING DIAGRAM

PROCEDURE

1.	CHECK OPERATION OF AUTO FUNCTION

(a) Check that the AUTO function operates when the operating conditions are met.

HINT:

Do not use the multi-information display to determine whether the AUTO function is operating or not.

Result	Proceed to
The AUTO function operates	A
The AUTO function does not operate	B

REPLACE COMBINATION METER ASSEMBLY

GO TO Electric Parking Brake System AUTO Function Circuit

Parts Location

PARTS LOCATION

ILLUSTRATION

PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

ECM

NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY

- EPB NO. 1 FUSE

SKID CONTROL ECU ASSEMBLY (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)

ILLUSTRATION

*1	PARKING BRAKE ACTUATOR ASSEMBLY LH	*2	PARKING BRAKE ACTUATOR ASSEMBLY RH
*3	ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)	*4	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*5	HYBRID VEHICLE CONTROL ECU	*6	COMBINATION METER ASSEMBLY
*7	RADIO RECEIVER ASSEMBLY	*8	INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU-IG1 NO. 3 FUSE - ECU-B NO. 2 FUSE
*9	DLC3	*10	AIR CONDITIONING AMPLIFIER ASSEMBLY
*11	DECELERATION SENSOR (AIRBAG ECU ASSEMBLY)	*12	NO. 2 PARKING BRAKE WIRE ASSEMBLY
*13	NO. 1 PARKING BRAKE WIRE ASSEMBLY	-	-

Precaution

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL

NOTICE:

When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following system(s) after the cable is reconnected.

System	See Procedure
Lane Departure Alert System (w/ Steering Control)
Intelligent Clearance Sonar System
Parking Assist Monitor System
Panoramic View Monitor System
Pre-collision System
Lighting System (for HV Model with Cornering Light)

TROUBLESHOOTING PRECAUTIONS

(a) When inspecting the rear brakes, disconnect the connector of the parking brake actuator assembly or disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Do not perform the rear brake inspection while either the parking brake actuator assembly connector or the negative (-) auxiliary battery terminal are connected.
The rear disc brake piston could operate, resulting in an accident such as hands being caught.

(b) The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.

(c) If a component has been removed and installed, confirm that the system operates normally by checking for DTCs after installation has been completed.

HANDLING PRECAUTIONS

(a) When tilting the vehicle to perform work after parking the vehicle on a level surface, the braking force may not be sufficient. Make sure to pull the electric parking brake switch (electric parking brake switch assembly) to the lock side 2 times (2 lock operations).

HINT:

The electric parking brake system determines the amount of force used to operate the parking brake according to the tilt angle detected by the deceleration sensor (airbag ECU assembly).
When the parking brake indicator (red) is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.

(b) The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light (red).

PRECAUTIONS FOR TOWING VEHICLES

(a) For towing precautions: Click here

PARKING BRAKE FORCED RELEASE METHOD

(a) For the parking brake forced release method: Click here

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Symptom	Suspected Area	Link
Electric parking brake does not operate	Proceed to "Electric Parking Brake does not Operate"
Parking brake indicator light does not illuminate (red) or turn off when parking brake is manually engaged and disengaged	Proceed to "Electric Parking Brake does not Operate"
Electric parking brake AUTO function (shift-linked function) does not operate (shift-linked parking brake does not lock or release)	Proceed to "Electric Parking Brake System AUTO Function Circuit"
Message not displayed on multi-information display when AUTO function set to ON/OFF	Proceed to "Message Not Displayed on Multi-Information Display When AUTO Function Set to ON/OFF"
Electric parking brake switch indicator light on electric parking brake switch (electric parking brake switch assembly) does not illuminate or turn off when lock and release operations are performed	Electric parking brake switch indicator light drive circuit
	Wire harness or connector (electric parking brake switch assembly - parking brake ECU (brake actuator assembly))	-
	Electric parking brake switch (electric parking brake switch assembly)
	Parking brake ECU (brake actuator assembly)

System Diagram

SYSTEM DIAGRAM

Terminals Of Ecu

TERMINALS OF ECU

CHECK PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly))

(a) Disconnect the A39 parking brake ECU (brake actuator assembly) connector.

(b) Measure the voltage and resistance according to the value (s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A39-9 (BEPB) - Body ground	R - Body ground	Parking brake power supply	Power switch off	11 to 14 V
A39-26 (IG) - Body ground	B - Body ground	IG power supply	Power switch on (IG)	8 to 16 V
A39-2 (EGND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
A39-13 (POL) - Body ground	L - Body ground	Electric parking brake switch indicator light	-	-
A39-14 (SWI1) - Body ground	P - Body ground	Electric parking brake switch (electric parking brake switch assembly)	-	-
A39-24 (SWI2) - Body ground	W - Body ground	Electric parking brake switch (electric parking brake switch assembly)	-	-
A39-20 (SWO1) - Body ground	SB - Body ground	Electric parking brake switch (electric parking brake switch assembly)	-	-
A39-22 (SWO2) - Body ground	V - Body ground	Electric parking brake switch (electric parking brake switch assembly)	-	-
A39-4 (MRR+) - Body ground	LA-Y - Body ground	Parking brake motor RH (parking brake actuator assembly RH) (+)	-	-
A39-3 (MRR-) - Body ground	LA-L - Body ground	Parking brake motor RH (parking brake actuator assembly RH) (-)	-	-
A39-7 (MRL+) - Body ground	LA-G - Body ground	Parking brake motor LH (parking brake actuator assembly LH) (+)	-	-
A39-8 (MRL-) - Body ground	LA-W - Body ground	Parking brake motor LH (parking brake actuator assembly LH) (-)	-	-
A39-27 (SPD) - Body ground	L - Body ground	Vehicle speed direct input	-	-
A39-12 (CANH) - Body ground	B - Body ground	CAN communication line H	-	-
A39-11 (CANL) - Body ground	W - Body ground	CAN communication line L	-	-

Test Mode Procedure

TEST MODE PROCEDURE

*1	Rear Disc Brake Piston
*2	Nut
*a	The nut moves inward in pad replacement mode

REAR BRAKE PAD REPLACEMENT MODE

HINT:

When replacing the rear disc brake pad and rear disc, since the nut inside the rear disc brake cylinder assembly is in an advanced position, it is necessary to move the nut back inside the cylinder. The nut can be moved back using pad replacement mode.

(a) Pad replacement mode

When Using the Techstream:

Turn the power switch off.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Chassis / Electric Parking Brake / Utility / Check Mode.
Follow the Techstream display and select "Next".
Push and hold the electric parking brake switch (electric parking brake switch assembly) to the release side for 5 seconds or more.
NOTICE:
- Make sure to perform this procedure with the power switch on (IG).
- Make sure that the brake pedal is not depressed when performing this procedure.
- When the system changes to pad replacement mode, DTC C13A7 may be stored. If the DTC is stored, clear the DTCs after the procedure (rear brake pad replacement, etc.) is complete.
HINT:

The parking brake indicator light flashes (red) (0.25 seconds intervals). After a short time, the parking brake actuator assembly operates (if the parking brake is engaged, the motor will operate to disengage the parking brake, and then will operate again). Once the parking brake actuator assembly is in the pad replacement position, the parking brake indicator light flashes (red) (1 second intervals).

Chassis > Electric Parking Brake > Utility

Tester Display
Check Mode

When not Using the Techstream:

Turn the power switch off.
Turn the power switch on (IG).
Within 8 seconds, operate the electric parking brake switch (electric parking brake switch assembly) to perform 3 lock side ON operations (from off (release) to on (pull)) and then 3 release side ON operations (from off (release) to on (push)).
NOTICE:
- If the operation is performed too quickly, the system may not respond. If the system does not respond, perform the operation again at a slower speed.
- The parking brake must be released.
HINT:

The parking brake indicator light (red) flashes (0.25 seconds intervals).
Push and hold the electric parking brake switch (electric parking brake switch assembly) to the release side for 5 seconds or more.
NOTICE:
- Make sure to perform this procedure with the power switch on (IG).
- Make sure that the brake pedal is not depressed when performing this procedure.
- When the system changes to pad replacement mode, DTC C13A7 may be stored. If the DTC is stored, clear the DTCs after the procedure (rear brake pad replacement, etc.) is complete.
HINT:

After a short time passes, the parking brake actuator assembly operates (if operated from the parking brake locked condition, the motor of the parking brake actuator assembly is temporarily stopped after being operated, and then operation starts again), and once the assembly finishes operating, the parking brake indicator light (red) flashes slowly (1 second intervals). (Nut moves back inside the cylinder and system enters pad replacement mode).

(b) Turn the power switch off.

NOTICE:

Do not operate the electric parking brake switch (electric parking brake switch assembly) until the procedure is complete. If operated, the system will return to its normal condition.

When Using the Techstream:

Disconnect the Techstream from the DLC3.

(1) After the procedure (rear brake pad replacement, etc.) is complete, turn the power switch on (IG) and pull the electric parking brake switch (electric parking brake switch assembly) to the lock side for 5 seconds or more.

NOTICE:

When performing work (replacing the rear brake pad, etc.), do not operate the electric parking brake switch (electric parking brake switch assembly) or turn the power switch on (IG) and operate the shift lever. If the electric parking brake switch (electric parking brake switch assembly) or shift lever is operated, the parking brake may operate and the rear disc brake piston may fall off. Also, make sure to disconnect the connector of the parking brake actuator assembly or disconnect the cable from the negative (-) auxiliary battery terminal.
When DTC C13A7 is stored, clear the DTCs.

Control Module Communication Bus OFF (U0073,U0100,U0124,U0129,U0293)

DESCRIPTION

The parking brake ECU (brake actuator assembly) communicates with the hybrid vehicle control ECU assembly, skid control ECU (brake booster with master cylinder assembly) and deceleration sensor (airbag ECU assembly) via CAN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
U0073	Control Module Communication Bus OFF	Both of following conditions are met: Power switch on (IG) Bus is off (communication with other ECUs is not possible).	CAN communication system	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0100	Lost Communication With ECM/PCM "A"	Both of following conditions are met: Vehicle being driven at 6 km/h (4 mph) or more. Parking brake ECU (brake actuator assembly) cannot receive signals from the ECM for approximately 15 seconds.	CAN communication system ECM	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0124	Lost Communication With Lateral Acceleration Sensor Module	Both of following conditions are met: Vehicle is being driven at 6 km/h (4 mph) or more. Parking brake ECU (brake actuator assembly) cannot receive signals from the deceleration sensor (airbag ECU assembly) for approximately 15 seconds.	CAN communication system Deceleration sensor (Airbag ECU assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0129	Lost Communication with Brake System Control Module	Both of following conditions are met: Power switch on (IG). Parking brake ECU (brake actuator assembly) cannot receive signals from the skid control ECU (brake booster with master cylinder assembly) for approximately 15 seconds or 30 seconds (malfunction duration differs depending on the signal).	CAN communication system Skid control ECU (brake booster with master cylinder assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0293	Lost Communication With Hybrid Vehicle Control System	Both of following conditions are met: Vehicle being driven at 6 km/h (4 mph) or more. Parking brake ECU cannot receive signals from the hybrid vehicle control ECU for approximately 15 seconds.	CAN communication system Hybrid vehicle control ECU	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

PROCEDURE

1.	GO TO CAN COMMUNICATION SYSTEM

(a) Go to CAN communication system.

Click here

END

Electric Parking Brake System(for Gasoline Model)

Forced Release(for Gasoline Model)

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: Cylinder 1 Injector "B" Circuit Open (P21CF13,P21D013-P21D413)
DESCRIPTION The D-4S system has two injection systems. One is an in-cylinder direct injection system that directly injects pressurized fuel into the combustion chamber. The other is an intake port injection system. The ECM determines the percentage of direct injection and port injection necessary in ...