Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026CPI
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): Electric Parking Brake does not Operate; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

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.

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

B

GO TO CAN COMMUNICATION SYSTEM

A

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 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; PARKING BRAKE: ELECTRIC PARKING BRAKE ACTUATOR: ON-VEHICLE INSPECTION

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

B

INSPECT REAR BRAKE

C

GO TO STEP 4

A

3.

INSPECT COMBINATION METER ASSEMBLY

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

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 GTS operation.

OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL

NG

GO TO METER / GAUGE SYSTEM 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): HOW TO PROCEED WITH TROUBLESHOOTING 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): HOW TO PROCEED WITH TROUBLESHOOTING

4.

CHECK HARNESS AND CONNECTOR (+BS TERMINAL VOLTAGE)

(a) Turn the power switch off.

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

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

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))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (IGR TERMINAL VOLTAGE)

(a) Turn the power switch off.

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A51-36 (IGR) - Body ground

Power switch on (IG)

11 to 14 V

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR