ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A3/31, C13AB/33

DTC Code DTC Name
C13A3/31 Open or Short in Lock Switch Circuit
C13AB/33 Lock Switch Circuit

DESCRIPTION

When the electric parking brake switch (integration control and panel assembly) is pulled to the lock side, a lock request signal is output to the parking brake ECU assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C13A3/31 Open or Short in Lock Switch Circuit

All of following conditions are met:


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

  2. Terminal LCK1 voltage is less than 2.3 V or more than 4.35 V; or terminal LCK2 voltage is less than 1.5 V* or more than 9.4 V*

  3. Problem occurs for approx. 1 sec.

Tech Tips

*: When battery voltage is 12 V

  • Electric parking brake switch (Integration control and panel assembly)

  • Wire harness or connector

  • Parking brake ECU assembly

 Yes An electric parking brake system malfunction is displayed on the multi-information display.
C13AB/33 Lock Switch Circuit

Both of following conditions are met:


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

  2. ON/OFF judgment of lock switch 1 and lock switch 2 does not match for approx. 1 sec.

  • Electric parking brake switch (Integration control and panel assembly)

  • Wire harness or connector

  • Parking brake ECU assembly

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

WIRING DIAGRAM

B0057XKE05

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 (integration control and panel assembly) is pulled and held for 1 second or more without being pulled fully to the lock side, one of the 2 linked contacts may turn on while the other one turns off causing this DTC to be stored (system is not malfunctioning).

  • When replacing the parking brake ECU assembly, operate the electric parking brake switch (integration control and panel 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 (INTEGRATION CONTROL AND PANEL ASSEMBLY)


    1. Remove the electric parking brake switch (integration control and panel assembly).

      Click here

    2. Inspect the electric parking brake switch (integration control and panel assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY Click here

    OK

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


    1. Disconnect the I35 electric parking brake switch (integration control and panel assembly) connector.

    2. Disconnect the Q24 parking brake ECU assembly connector.

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

      Standard Resistance
      for LHD:
      Tester Connection Condition Specified Condition
      Q24-20 (LCK1) - I35-9 (LOK1) Always Below 5 Ω
      Q24-15 (LCK2) - I35-10 (LOK2) Always Below 5 Ω
      Q24-20 (LCK1) or I35-9 (LOK1) - Body ground Always 10 kΩ or higher
      Q24-15 (LCK2) or I35-10 (LOK2) - Body ground Always 10 kΩ or higher
      I35-16 (GND1) - Body ground Always Below 5 Ω
      for RHD:
      Tester Connection Condition Specified Condition
      Q24-20 (LCK1) - I35-16 (LOK1) Always Below 5 Ω
      Q24-15 (LCK2) - I35-15 (LOK2) Always Below 5 Ω
      Q24-20 (LCK1) or I35-16 (LOK1) - Body ground Always 10 kΩ or higher
      Q24-15 (LCK2) or I35-15 (LOK2) - Body ground Always 10 kΩ or higher
      I35-9 (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 > Electric Parking Brake > Clear DTCs

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Perform a lock operation with the electric parking brake switch (integration control and panel assembly).

      Tech Tips

      When the electric parking brake switch (integration control and panel assembly) is pulled and held for 1 second or more without being pulled fully to the lock side, one of the 2 linked contacts may turn on while the other one turns off causing this DTC to be stored (system is not malfunctioning).

    5. Check for DTCs.

      Click here


      Chassis > Electric Parking Brake > Trouble Codes
      Result
      Proceed to
      DTC is output
      DTC is not output

    DTC is output

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    DTC is not output

    USE SIMULATION METHOD TO CHECK Click here