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Home >> Lexus >> 2018 >> LS 500 Base, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Vacuum Brake Booster) - Diagnostic Codes (1 Of 4) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster) >> DTC C050C-12: Left Rear Wheel Speed Sensor Circuit Short to Battery; DTC C0512-12: Right Rear Wheel Speed Sensor Circuit Short to Battery [09/2018 - 10/2023] >> Procedure

DTC C050C-12: Left Rear Wheel Speed Sensor Circuit Short to Battery; DTC C0512-12: Right Rear Wheel Speed Sensor Circuit Short to Battery [09/2018 - 10/2023]: Procedure

  1. CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) 
    1. Disconnect the L178 or z24 front speed sensor connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR RH

      Tester Connection Switch Condition Specified Condition
      z24-2 (RR+) - z24-1 (RR-) Engine switch on (IG) 11 to 14 V
      FOR LH

      Tester Connection Switch Condition Specified Condition
      L178-2 (RL+) - L178-1 (RL-) Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR SPEED SENSOR. Refer to  REMOVAL [12/2017 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) 
    1. Disconnect the L175 and/or LL4 front skid control sensor wire connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR RH

      Tester Connection Switch Condition Specified Condition
      L175- 3 (RR+) - L175- 4 (RR-) Engine switch on (IG) 11 to 14 V
      FOR LH

      Tester Connection Switch Condition Specified Condition
      LL4- 3 - LL4- 4 Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL SENSOR WIRE. Refer to  REMOVAL [12/2017 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) 
    1. Disconnect the L175 and/or LL4 front skid control sensor wire connector.
    2. Disconnect the A9 skid control ECU (brake actuator assembly) connector.
    3. Turn the engine switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR RH

      Tester Connection Switch Condition Specified Condition
      L175- 4 (RR-) - Body ground Engine switch on (IG) Below 5 V
      FOR LH

      Tester Connection Switch Condition Specified Condition
      LL4- 4 - Body ground Engine switch on (IG) Below 5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SKID CONTROL SENSOR WIRE) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    2. Disconnect the L175 and/or LL4 front skid control sensor wire connector.
    3. Disconnect the A9 skid control ECU (brake actuator assembly) connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR RH

      Tester Connection Condition Specified Condition
      L175- 3 (RR+) or A9- 16 (RR+) - L175- 4 (RR-) or A9- 15 (RR-) Always 10 kΩ or higher
      FOR LH

      Tester Connection Condition Specified Condition
      LL4- 3 or A9- 29 (RL+) - LL4- 4 or A9- 28 (RL-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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