DTC C060B-12: Left Electric Parking Brake Actuator Control Circuit Short to Battery [12/2021 - ]: Procedure

1. Turn the ignition switch off.
2. Make sure the No. 2 parking brake wire assembly is securely installed.
3. Disconnect the N57 parking brake actuator assembly LH connector.
4. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   N57-2 (+) - N57-1 (-)	Electric parking brake not operating	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY LH. Refer to  REMOVAL [11/2018 - ] 

Result: 

NG 

See step  2

1. Disconnect the NN12 No. 2 parking brake wire assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 2 Parking Brake Wire Assembly)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   NN12-1 - NN12-2	Electric parking brake not operating	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY 

Result: 

NG 

See step  3

1. Disconnect the NN12 No. 2 parking brake wire assembly connector.
2. Disconnect the A105 No. 2 skid control ECU (brake actuator assembly) connector.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector	*b	(to No. 2 Skid Control ECU (Brake Actuator Assembly))
   *c	(to No. 2 Parking Brake Wire Assembly)	-	-

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   NN12-1 or A105-3 (MRL+) - Body ground	Always	Below 1 V
   NN12-2 or A105-2 (MRL-) - Body ground	Always	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [12/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR