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 electric parking brake switch is pushed to the lock side, a lock request signal is output to parking brake ECU.

DTC Code Detection Condition Trouble Area
C13A3/31

All 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. Terminal LCK1's voltage is less than 2.3 V or more than 4.2 V; or terminal LCK2's voltage is less than 1.4 V* or more than 9 V*

  3. Problem occurs for approx. 1 sec.

  • Electric parking brake switch

  • Wire harness or connector

  • Electric parking brake ECU
C13AB/33

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

  • Electric parking brake switch

  • Wire harness or connector

  • Electric parking brake ECU

Tech Tips

*: When battery voltage is 11 V

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.

  • The electric parking brake switch interior's linked double contacts may become unlinked (one is off, one is on) if the switch is halfway pushed/pulled. If this condition continues for 1 second or more, this DTC is output.

PROCEDURE


  1. INSPECT ELECTRIC PARKING BRAKE SWITCH


    1. Remove the electric parking brake switch Click here.

    2. A01GMB0E01

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      7 (LOK1) - 8 (GND) OFF 97.09 to 107.31 kΩ
      Lock (Push) 2.09 to 2.31 kΩ
      9 (LOK2) - 8 (GND) OFF 5.51 to 6.09 kΩ
      Lock (Push) 1.045 to 1.115 kΩ

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (ECU - SWITCH)


    1. Disconnect the S48 ECU connector.

    2. Disconnect the L39 switch connector.

    3. A01GNN6E01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S48-12 (LCK1) - L39-7 (LOK1) Always Below 5 Ω
      S48-12 (LCK1) - Body ground Always 10 kΩ or higher
      S48-15 (LCK2) - L39-9 (LOK2) Always Below 5 Ω
      S48-15 (LCK2) - Body ground Always 10 kΩ or higher
      L39-8 (GND) - Body ground Always Below 5 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CLEAR DTC


    1. Turn the engine switch off.

    2. Securely install the parking brake ECU connectors and electric parking brake switch.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the engine switch on (IG) and the tester ON.

    5. Clear the DTC Click here.


    NEXT

  4. CHECK FOR DTC


    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG) and the tester ON.

    4. Perform the electric parking brake switch lock control.

    5. Check for DTC.

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

    REPLACE ELECTRIC PARKING BRAKE ECU Click here