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Home >> Lexus >> 2021 >> UX 250h Luxury >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Electric Parking Brake System (Diagnostic Codes & Circuit Tests) (Hybrid) >> ELECTRIC PARKING BRAKE SYSTEM (for HV Model) >> DTC C13A1: Short circuit in Power source circuit [10/2018 - 08/2021] >> Procedure

DTC C13A1: Short circuit in Power source circuit [10/2018 - 08/2021]: Procedure

  1. CHECK HARNESS AND CONNECTOR (BEPB CIRCUIT) 
    GTY830028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Parking Brake ECU (Brake Actuator Assembly))
    1. Turn the power switch off.
    2. Disconnect the parking brake ECU (brake actuator assembly) connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A48-9 (BEPB) - Body ground Power switch off 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - IG POWER SOURCE CIRCUIT) 
    GTY787674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Parking Brake ECU (Brake Actuator Assembly))
    1. Turn the power switch off.
    2. Disconnect the parking brake ECU (brake actuator assembly) connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A48-26 (IG) - Body ground Power switch off Below 2.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY 
    1. Remove the electric parking brake switch assembly.

      Refer to REMOVAL [10/2018 - ]

    2. Inspect the electric parking brake switch assembly.

      Refer to INSPECTION [10/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY. Refer to  REMOVAL [10/2018 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) 
    GTY787675Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Parking Brake ECU (Brake Actuator Assembly))
    1. Disconnect the F37 electric parking brake switch assembly connector.
    2. Disconnect the parking brake ECU (brake actuator assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A48-14 (SWI1) - Body ground Always 10 kΩ or higher
      A48-20 (SWO1) - Body ground Always 10 kΩ or higher
      A48-24 (SWI2) - Body ground Always 10 kΩ or higher
      A48-22 (SWO2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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