Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026CPK
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): Brake Warning Light (Yellow) Remains On; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

Brake Warning Light (Yellow) Remains On

DESCRIPTION

This procedure is for troubleshooting when the brake warning light (yellow) remains on but no DTCs are output.

The skid control ECU (brake actuator assembly) controls the brake warning light (yellow) in the combination meter assembly via CAN communication.

PROCEDURE

1.

CHECK VEHICLE CONTROL HISTORY (ELECTRIC PARKING BRAKE SYSTEM)

(a) Using the GTS, check for Vehicle Control History.

Click here 2023 MY Corolla Corolla HV [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): VEHICLE CONTROL HISTORY (RoB) 2023 - 2025 MY Corolla Corolla HV [11/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): VEHICLE CONTROL HISTORY (RoB)

Chassis > Brake/EPB > Utility

Tester Display

Vehicle Control History (RoB)

HINT:

If vehicle control history is stored when the electric parking brake system is suspended, the brake warning light (yellow) illuminates.

Result

Proceed to

There is no vehicle control history for when the electric parking brake system was suspended.

A

There is vehicle control history for when the electric parking brake system was suspended.

B
B

ERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY

Click here 2023 MY Corolla Corolla HV [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): VEHICLE CONTROL HISTORY (RoB) 2023 - 2025 MY Corolla Corolla HV [11/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): VEHICLE CONTROL HISTORY (RoB)

NOTICE:

After performing troubleshooting and repair regarding vehicle control history, clear the vehicle control history.
A

2.

INSPECT COMBINATION METER ASSEMBLY (BRAKE WARNING LIGHT (YELLOW))

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

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): DATA LIST / ACTIVE TEST 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): DATA LIST / ACTIVE TEST

Body Electrical > Combination Meter > Active Test

Tester Display

ECB Warning

(b) Check the combination meter assembly.

OK:

The brake warning light (yellow) 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

INSPECT 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