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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 126 (Electric Parking Brake System (HV) - Diagnostic Codes & Symptom Tests) >> ELECTRIC PARKING BRAKE SYSTEM (for HV Model) >> DTC C123A-14: Supply Voltage Circuit IG Open [12/2019 - 11/2023] >> Procedure

DTC C123A-14: Supply Voltage Circuit IG Open [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK HARNESS AND CONNECTOR (IG TERMINAL VOLTAGE) 
    1. Disconnect the A57 No. 2 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.
      GTY907400Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Skid Control ECU (Brake Actuator Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      A57-45 (IG1) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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