DTC C13A1: Short circuit in Power source circuit [09/2018 - ]: Procedure

1. Turn the engine switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Parking Brake ECU Assembly)

2. Disconnect the parking brake ECU assembly connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   X67-4 (IG) - Body ground	Engine switch off	Below 2.5 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR IG POWER SOURCE CIRCUIT 

Result: 

OK 

See step  2

1. Inspect the electric parking brake switch assembly.

   Refer to INSPECTION [03/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

Result: 

OK 

See step  3

1. Turn the engine switch off.
2. Disconnect the P36 electric parking brake switch assembly connector.
3. Disconnect the parking brake ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Parking Brake ECU Assembly)

4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   X67-12 (LCK1) - Body ground	Always	10 kΩ or higher
   X67-13 (REL2) - Body ground	Always	10 kΩ or higher
   X67-15 (LCK2) - Body ground	Always	10 kΩ or higher
   X67-16 (REL1) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING BRAKE ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR