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 assembly is pushed 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. Power switch on (IG) or electric parking brake switch assembly pushed to lock side with power 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 1.4 V* or more than 9 V*.

  3. Problem occurs for approximately 1 second.

Tech Tips

*: This value is based on the assumption that the BECU terminal voltage is 11 V.

The threshold changes according to the BECU terminal voltage.

For details, refer to "Threshold Changes According to BECU Terminal Voltage".

  • Electric parking brake switch 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. Power switch on (IG) or electric parking brake switch assembly pushed to lock side with power switch off.

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

  • Electric parking brake switch assembly

  • Wire harness or connector

  • Parking brake ECU assembly

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

Figure 1. Threshold Changes According to BECU Terminal Voltage

B004AFJC01
*a BECU Terminal Voltage (V)
*b LCK2 Terminal Voltage (V)
*c Normal Range
*d DTC Detection Range

WIRING DIAGRAM

B004B2SE12
*a Lock Switch (Push)
*b Release Switch (Pull)
*c Electric Parking Brake Switch Assembly
*d Parking Brake ECU Assembly

CAUTION / NOTICE / HINT

Note


  • The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.

  • When the electric parking brake switch assembly is pushed and held for 1 second or more without being pushed 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.

  • If the parking brake ECU assembly is replaced, perform the "Reset Memory" and "Acquire Tension Sensor Zero Point" procedures.

    Click here

PROCEDURE


  1. INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY


    1. 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 (PARKING BRAKE ECU ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)


    1. Turn the power switch off.

    2. Disconnect the P36 electric parking brake switch assembly connector.

    3. Disconnect the X67 parking brake ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X67-12 (LCK1) - P36-1 (LOK1) Always Below 5 Ω
      X67-15 (LCK2) - P36-2 (LOK2) Always Below 5 Ω
      X67-12 (LCK1) or P36-1 (LOK1) - Body ground Always 10 kΩ or higher
      X67-15 (LCK2) or P36-2 (LOK2) - Body ground Always 10 kΩ or higher
      P36-14 (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 power switch off.

    3. Turn the power switch on (IG).

    4. Perform a lock operation with the electric parking brake switch assembly.

      Tech Tips

      When the electric parking brake switch assembly is pushed and held for 1 second or more without being pushed 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.

    5. Check for DTCs.

      Click here


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

    A

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    B

    USE SIMULATION METHOD TO CHECK Click here