Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026CPA
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): C060B12; Left Electric Parking Brake Actuator Control Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

DTC

C060B12

Left Electric Parking Brake Actuator Control Circuit Short to Battery

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C060B12

Left Electric Parking Brake Actuator Control Circuit Short to Battery
  • Diagnosis Condition:

    Electric parking brake not operating

  • Malfunction Status:

    The ECU power supply is normal but there is a malfunction in the electric parking brake actuator LH internal circuit (short to +B).

  • Detection Time:

    Approximately 0.015 to 0.195 seconds (depending on each malfunction)
  • Parking brake actuator assembly LH
  • No. 2 parking brake wire assembly
  • Wire harness or connector
  • Skid control ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): C060B00,C060B11; Left Electric Parking Brake Actuator Control

PROCEDURE

1.

CHECK FOR SHORT TO +B

(a) Turn the power switch off.

(b) Make sure the No. 2 parking brake wire assembly is securely installed.

(c) Disconnect the n1 parking brake actuator assembly LH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

n1-2 (LE+) - n1-1 (LE-)

Electric parking brake not operating

Below 1 V

*a

Front view of No. 2 Parking Brake Wire Assembly

(to Parking Brake Actuator Assembly LH)
OK

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY LH

NG

2.

CHECK FOR SHORT TO +B

(a) Disconnect the nO3 No. 2 parking brake wire assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

nO3-1 - nO3-2

Electric parking brake not operating

Below 1 V

*a

Front view of wire harness connector

(to No. 2 Parking Brake Wire Assembly)
OK

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY
NG

3.

CHECK FOR SHORT TO +B

(a) Disconnect the nO3 No. 2 parking brake wire assembly connector.

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

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

*a

Front view of wire harness connector

*b

(to Skid Control ECU (Brake Actuator Assembly))

*c

(to No. 2 Parking Brake Wire Assembly)

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

nO3-1 or A51-13 (MRL+) - Body ground

Always

Below 1 V

nO3-2 or A51-12 (MRL-) - Body ground

Always

Below 1 V
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