DTC C13A1/12: Short in Power Supply Relay Circuit: Procedure

1. Remove the electric parking brake switch. Refer to REMOVAL .
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying Electric Parking Brake Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   6 (RLS1) - 8 (GND)	Switch OFF	5.51 to 6.09 kΩ
   7 (LOK1) - 8 (GND)	Switch OFF	97.09 to 107.31 kΩ
   9 (LOK2) - 8 (GND)	Switch OFF	5.51 to 6.09 kΩ
   10 (RLS2) - 8 (GND)	Switch OFF	5.51 to 6.09 kΩ

NG → See step   3 

OK: Go to next step 

1. Disconnect the L39 switch connector.
2. Disconnect the S48 ECU connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying Harness Connector S48 (ECU - Switch)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   S48-12 (LCK1) - Body ground	Always	10 kΩ or higher
   S48-13 (REL2) - Body ground	Always	10 kΩ or higher
   S48-15 (LCK2) - Body ground	Always	10 kΩ or higher
   S48-16 (REL1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4