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 (engine switch is on (IG), or 15 sec. after engine 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 sec.

  • Electric parking brake ECU

  • Wire harness or connector

  • Electric parking brake switch

WIRING DIAGRAM

A01GHXBE01

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.

  • Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more.

PROCEDURE


  1. INSPECT ELECTRIC PARKING BRAKE SWITCH


    1. Remove the electric parking brake switch Click here.

    2. A01GMYTE01

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

      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

    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. A01GMVJE05

      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