ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A1/12

DTC Code DTC Name
C13A1/12 Short in Power Supply Relay Circuit

DESCRIPTION

The electric parking brake ECU performs the lock/release operation of the parking brake based on signals from the electric parking brake switch, or instruction signals from other systems via CAN communication.

DTC Code Detection Condition Trouble Area
C13A1/12

Both of following conditions are met:


  1. Electric parking brake ECU is ON (power switch is ON (IG), or 15 seconds after power switch is OFF and electric parking brake switch lock control is operating)

  2. Electric parking brake ECU's power source relay is shorted for approx. 60 seconds

  • Electric parking brake ECU

  • Harness or connector

  • Electric parking brake switch

WIRING DIAGRAM

A01H1JOE01

INSPECTION PROCEDURE

Note


  • If the electric parking brake ECU or parking brake with bracket actuator assembly is replaced, perform the "RESET MEMORY" and "ACQUIRE TENSION SENSOR ZERO POINT" procedures Click here.

  • Even after the power switch is turned OFF, the electric parking brake ECU may store a DTC as a result of removing a connector or fuse, as the ECU is still operating. Therefore, during inspection or replacement, turn the power switch OFF and wait for 20 seconds before removing the following: 1) connectors of the electric parking brake ECU, and 2) fuses of the electric parking brake system circuit.

PROCEDURE


  1. INSPECT ELECTRIC PARKING BRAKE SWITCH


    1. Remove the electric parking brake switch Click here.

    2. A01GZP7E03

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

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

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (ECU - SWITCH)


    1. Disconnect the L39 switch connector.

    2. Disconnect the S48 ECU connector.

    3. A01GZJFE01

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

      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

    REPLACE ELECTRIC PARKING BRAKE ECU Click here