Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001NX6P
Model Year Start: 2021 Model: Corolla Prod Date Range: [04/2020 - 09/2022]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): Electric Parking Brake System AUTO Function Circuit; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

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:

After replacing the parking brake ECU (brake actuator assembly), the parking brake indicator light (red) blinks when the power switch is turned on (IG) for the first time. To turn off the parking brake indicator light (red) after replacing the parking brake ECU (brake actuator assembly), operate the electric parking brake switch to the lock side then to the release side.

PROCEDURE

1.

CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

(a) Check for DTCs.

Chassis > ABS/VSC/TRC > Trouble Codes

Result

Proceed to

DTC is not output

A

DTC is output

B
B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

A

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
A

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

B

GO TO HYBRID CONTROL SYSTEM

for Nickel Metal Hydride Battery: Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): HOW TO PROCEED WITH TROUBLESHOOTING

for Lithium-ion Battery: Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): HOW TO PROCEED WITH TROUBLESHOOTING