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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Electric Parking Brake System (Except HV) - Diagnostic Codes & Symptom Tests >> ELECTRIC PARKING BRAKE SYSTEM (for Gasoline Model) >> DTC C1020-14: Ignition Switch On/Start Position Circuit Short to Ground or Open [11/2023 - ] >> Procedure

DTC C1020-14: Ignition Switch On/Start Position Circuit Short to Ground or Open [11/2023 - ]: Procedure

  1. CHECK VEHICLE SPECIFICATION 

    Result

    Result Proceed to
    w/o Stop and Start System A
    w/ Stop and Start System B

    Result: 

    B 

    See step  3

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (IG TERMINAL VOLTAGE) 
    1. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A39-45 (IG1) - Body ground Ignition switch ON 11 to 14 V
      GTY907397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK HARNESS AND CONNECTOR (IG TERMINAL VOLTAGE) 
    1. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A39-45 (IG1) - Body ground Ignition switch ON 10.5 to 16 V
      GTY907397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT). Refer to  Backup Boost Converter Circuit [11/2023 - ] 

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