Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001G8ZW
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): C13A9; Brake System Malfunction; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

C13A9

Brake System Malfunction

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

Detection conditions (1)

  • Diagnosis Condition:

    Power switch on (IG)

  • Malfunction Status:

    Abnormal signal received from all speed sensors from skid control ECU (brake booster with master cylinder assembly)

  • Detection Time:

    Approximately 0.3 seconds

Detection conditions (2)

  • Diagnosis Condition:

    Power switch on (IG)

  • Malfunction Status:

    Brake system malfunctioning signal received from skid control ECU (brake booster with master cylinder assembly)

  • Detection Time:

    Approximately 0.3 seconds

Detection conditions (3), (4)

  • Diagnosis Condition:

    Power switch on (IG), vehicle being driven and parking brake not engaged

  • Malfunction Status:

    When parking brake ECU (brake actuator assembly) not outputting parking brake operation request signal, there is parking brake operation signal from skid control ECU (brake booster with master cylinder assembly)

  • Detection Time:

    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.

DTC Detection Conditions

 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

Power switch on (IG)

○

○

○

-

Vehicle being driven and parking brake not engaged

-

-

-

○

Malfunction Status

Abnormal signal received from all speed sensors from skid control ECU (brake booster with master cylinder assembly)

○

-

-

-

Brake system malfunctioning signal received from skid control ECU (brake booster with master cylinder assembly)

-

○

-

-

When parking brake ECU (brake actuator assembly) not outputting parking brake operation request signal, there is parking brake operation signal from skid control ECU (brake booster with master cylinder assembly)

-

-

○

○

Detection Time

Approximately 0.3 seconds

Approximately 0.3 seconds

Approximately 0.3 seconds

Approximately 0.3 seconds

Number of Trips

1 trip

1 trip

1 trip

1 trip

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

DTCs are not output

A

DTCs are output

B
B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): DIAGNOSTIC TROUBLE CODE CHART

A

2.

CHECK DTC (ELECTRIC PARKING BRAKE SYSTEM)

(a) Clear the DTCs.

Chassis > Electric Parking Brake > Clear DTCs

(b) Turn the power switch off.

(c) Check for DTCs.

Chassis > Electric Parking Brake > Trouble Codes

Result

Proceed to

DTCs are output

A

DTCs are not output

B
A

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

B

USE SIMULATION METHOD TO CHECK