PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for Gasoline Model): C060B12; Left Electric Parking Brake Actuator Control Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM10000000277RU
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [09/2022 - ]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for Gasoline Model): C060B12; Left Electric Parking Brake Actuator Control Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [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.

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1.	CHECK FOR SHORT TO +B

(a) Turn the engine switch off.

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
n1-2 (+) - n1-1 (-)	Electric parking brake not operating	Below 1 V

*a	Front view of No. 2 Parking Brake Wire Assembly (to Parking Brake Actuator Assembly LH)

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)

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

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.

*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

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR