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

When the electric parking brake switch is pulled, a release request signal is output to the electric parking brake ECU.

DTC Code DTC Detection Condition Trouble Area
C13A3/31

Either condition is met:


  • An unspecified failure occurs in the electric parking brake switch.

  • An internal short circuit to +B is detected in the electric parking brake switch.

  • Electric parking brake switch

  • Harness or connector

  • Electric parking brake ECU (Parking brake with bracket actuator assembly)
C13AB/33 A malfunction occurs in the electric parking brake switch.

WIRING DIAGRAM

A005S3ZE01

INSPECTION PROCEDURE

Note


  • Before performing work, turn the ignition switch off and wait approximately 20 seconds to make sure that the parking brake cannot operate.

  • When replacing the parking brake with bracket actuator assembly, perform zero point calibration Click here.

PROCEDURE


  1. INSPECT ELECTRIC PARKING BRAKE SWITCH


    1. Remove the electric parking brake switch Click here.

    2. A005UXWE01

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      8 (LOK1) - 7 (LOK2) Neutral 1M Ω or higher
      Pushed (Lock) 1.29 k to 1.32 kΩ
      Pulled (Release) 3.87 k to 3.96 kΩ
      3 (RLS1) - 4 (RLS2) Neutral 1M Ω or higher
      Pushed (Lock) 3.48 k to 3.56 kΩ
      Pulled (Release) 1.36 k to 1.40 kΩ
      7 (LOK2) - 4 (RLS2) Always 2.58 k to 2.64 kΩ
      7 (LOK2) - 3 (RLS1) Neutral 1M Ω or higher
      Pushed (Lock) 890 to 920 Ω
      Pulled (Release) 3.95 k to 4.03 kΩ
      4 (RLS2) - 8 (LOK1) Neutral 1M Ω or higher
      Pushed (Lock) 3.87 k to 3.96 kΩ
      Pulled (Release) 1.29 k to 1.32 kΩ
      3 (RLS1) - 8 (LOK1) Neutral 2.58 k to 2.64 kΩ
      Pushed (Lock) 1.40 k to 1.44 kΩ
      Pulled (Release) 1.53 k to 1.57 kΩ

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH Click here

    OK

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


    1. Disconnect the electric parking brake switch connector.

    2. Disconnect the electric parking brake ECU connector.

    3. A005TLYE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Electric Parking Brake Switch)
      *2

      Front view of wire harness connector

      (to Electric Parking Brake ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D13-3 (RLS1) - I1-10 (REL1) Always Below 1 Ω
      D13-3 (RLS1) - Body ground Always 100 kΩ or higher
      D13-4 (RLS2) - I1-6 (REL2) Always Below 1 Ω
      D13-4 (RLS2) - Body ground Always 100 kΩ or higher
      D13-7 (LOK2) - I1-9 (LCK2) Always Below 1 Ω
      D13-7 (LOK2) - Body ground Always 100 kΩ or higher
      D13-8 (LOK1) - I1-8 (LCK1) Always Below 1 Ω
      D13-8 (LOK1) - Body ground Always 100 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Operate the electric parking brake switch.

    3. Check for DTCs Click here.

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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY Click here