PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for Gasoline Model): Electric Parking Brake does not Operate; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000026K3W
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [09/2022 - 11/2022]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for Gasoline Model): Electric Parking Brake does not Operate; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]

Electric Parking Brake does not Operate

WIRING DIAGRAM

except TMC Made

for TMC Made

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

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.

Chassis > Brake/EPB > Trouble Codes

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

GO TO CAN COMMUNICATION SYSTEM

for TMC Made: Click here

except TMC Made: Click here

2.	VEHICLE OPERATION CHECK

(a) With the wheels not contacting the ground, check the condition of the rear wheels when the electric parking brake is operating and not operating.

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 4

3.	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 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

GO TO METER / GAUGE SYSTEM

4.	CHECK HARNESS AND CONNECTOR (+BS TERMINAL VOLTAGE)

(a) Turn the engine switch off.

(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A51-30 (+BS) - Body ground	Always	11 to 14 V

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (IG1 TERMINAL VOLTAGE)

(a) Turn the engine switch off.

(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A51-36 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V

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

(d) for TMC Made:

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A51-36 (IGR) - Body ground	Engine switch on (IG)	11 to 14 V

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

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR