ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A4/32, C13AC/34

DTC Code DTC Name
C13A4/32 Open or Short in Release Switch Circuit
C13AC/34 Release Switch Circuit

DESCRIPTION

When the electric parking brake switch assembly is pushed to the release side, a release request signal is sent to the skid control ECU (brake actuator assembly).

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C13A4/32 Open or Short in Release Switch Circuit

All of following conditions are met:


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

  2. Terminal REL1 voltage is less than 1.5 V* or more than 9.4 V*; or terminal REL2 voltage is less than 1.5 V* or more than 9.4 V*

  3. Problem occurs for approximately 1 second.

Tech Tips

*: When battery voltage is 12 V

  • Electric parking brake switch assembly

  • Wire harness or connector

  • Skid control ECU (brake actuator assembly)

 DTC stored An electric parking brake system malfunction is displayed on the multi-information display.
C13AC/34 Release Switch Circuit

Both of following conditions are met:


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

  2. ON/OFF judgment of release switch 1 and release switch 2 does not match for approximately 1 second.

  • Electric parking brake switch assembly

  • Wire harness or connector

  • Skid control ECU (brake actuator assembly)

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

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

Note


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

  • When the electric parking brake switch assembly is not fully pushed and held to the release side for 1 second or more, only 1 of 2 internal contacts may contact causing a DTC to be stored. This is not a malfunction.

  • When replacing the skid control ECU (brake actuator assembly), operate the electric parking brake switch assembly, as the parking brake indicator light (red) blinks when the engine switch is first turned on (IG).

PROCEDURE


  1. 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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)


    1. Disconnect the J85 electric parking brake switch assembly connector.

    2. Disconnect the A41 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A41-31 (REL1) - J85-1 (RLS1) Always Below 5 Ω
      A41-39 (REL2) - J85-2 (RLS2) Always Below 5 Ω
      A41-31 (REL1) or J85-1 (RLS1) - Body ground Always 10 kΩ or higher
      A41-39 (REL2) or J85-2 (RLS2) - Body ground Always 10 kΩ or higher
      J85-16 (GND1) - Body ground Always Below 5 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A41-31 (REL1) - J85-8 (RLS1) Always Below 5 Ω
      A41-39 (REL2) - J85-7 (RLS2) Always Below 5 Ω
      A41-31 (REL1) or J85-8 (RLS1) - Body ground Always 10 kΩ or higher
      A41-39 (REL2) or J85-7 (RLS2) - Body ground Always 10 kΩ or higher
      J85-16 (GND1) - Body ground Always Below 5 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC/EPB > Clear DTCs

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Push the electric parking brake switch assembly to the release side.

      Tech Tips

      When the electric parking brake switch assembly is not fully pushed and held to the release side for 1 second or more, only 1 of 2 internal contacts may contact causing a DTC to be stored. This is not a malfunction.

    5. Check for DTCs.

      Click here


      Chassis > ABS/VSC/TRC/EPB > Trouble Codes
      Result
      Result Proceed to
      DTCs are output A
      DTCs are not output B

    A

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    B

    USE SIMULATION METHOD TO CHECK Click here