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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 C0610-12: Right Electric Parking Brake Actuator Control Circuit Short to Battery [12/2019 - ] >> Procedure

DTC C0610-12: Right Electric Parking Brake Actuator Control Circuit Short to Battery [12/2019 - ]: Procedure

  1. CHECK FOR SHORT TO +B 
    1. Turn the ignition switch off.
    2. Make sure the No. 1 parking brake wire assembly is securely installed.
    3. Disconnect the u1 parking brake actuator assembly RH connector.
    4. Measure the voltage according to the value(s) in the table below.
      GTY931908Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of No. 1 Parking Brake Wire Assembly
      (to Parking Brake Actuator Assembly RH)

      Standard Voltage

      Tester Connection Condition Specified Condition
      u1-2 (+) - u1-1 (-) Electric parking brake not operating Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE PARKING BRAKE ACTUATOR ASSEMBLY RH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK FOR SHORT TO +B 
    1. Disconnect the uM1 No. 1 parking brake wire assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY942961Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 Parking Brake Wire Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      uM1-1 - uM1-2 Electric parking brake not operating Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    NG 

    See step  3

  3. CHECK FOR SHORT TO +B 
    1. Disconnect the uM1 No. 1 parking brake wire assembly connector.
    2. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    3. Measure the voltage according to the value(s) in the table below.
      GTY918832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector *b (to Skid Control ECU (Brake Actuator Assembly))
      *c (to No. 1 Parking Brake Wire Assembly) - -

      Standard Voltage

      Tester Connection Condition Specified Condition
      uM1-1 or A39-13 (MRR+) - Body ground Always Below 1 V
      uM1-2 or A39-12 (MRR-) - Body ground Always Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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