ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A1/12

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

DESCRIPTION

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

DTC Code Detection Condition Trouble Area Note
C13A1/12

Both of following conditions are met:


  1. Engine switch on (IG) or electric parking brake switch assembly pulled to lock side with engine switch off.

  2. Parking brake ECU assembly power source relay is shorted for approx. 60 sec.

  • EPB-IG fuse*

  • Parking brake ECU assembly

  • Wire harness or connector

  • Electric parking brake switch assembly

 An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

A01WQT9E02

CAUTION / NOTICE / HINT

Note


  • If the parking brake ECU 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.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU - IG POWER SOURCE CIRCUIT)


    1. Turn the engine switch off.

    2. A01WW2DE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

      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
      K53-4 (IG) - Body ground Engine switch off Below 2.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY


    1. Remove the electric parking brake switch assembly Click here.

    2. Inspect the electric parking brake switch assembly Click here.


    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)


    1. Turn the engine switch off.

    2. Disconnect the V13 electric parking brake switch assembly connector.

    3. Disconnect the parking brake ECU assembly connector.

    4. A01WSR0E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K53-12 (LCK1) - Body ground Always 10 kΩ or higher
      K53-13 (REL2) - Body ground Always 10 kΩ or higher
      K53-15 (LCK2) - Body ground Always 10 kΩ or higher
      K53-16 (REL1) - Body ground Always 10 kΩ or higher

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR