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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Except HV) - Diagnostic Codes (1 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC C050C-12: Left Rear Wheel Speed Sensor Circuit Short to Battery [11/2023 - ] >> Procedure

DTC C050C-12: Left Rear Wheel Speed Sensor Circuit Short to Battery [11/2023 - ]: Procedure

  1. CHECK VEHICLE SPECIFICATION 
    1. Check the vehicle specification.

      Result

      Result Proceed to
      for 2WD A
      for AWD B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY873501Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)
      (to Rear Speed Sensor LH (Rear Axle Hub and Bearing Assembly LH))

      OK

      The connector is securely connected.

    2. Disconnect the u4 rear speed sensor LH (rear axle hub and bearing assembly LH) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      u4-2 (+) - u4-1 (-) Ignition switch ON 11 to 14 V

      HINT: 

      • The rear speed sensor LH is incorporated into the rear axle hub and bearing assembly LH.
      • If the rear speed sensor LH needs to be replaced, replace the rear axle hub and bearing assembly LH.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) 
    1. Turn the ignition switch off.
      GTY853839Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire LH (No. 2 Parking Brake Wire Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the uM2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Turn the ignition switch to ON.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      uM2-3 (RL+) - uM2-4 (RL-) Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) 
    1. Turn the ignition switch off.
      GTY853842Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire LH (No. 2 Parking Brake Wire Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      uM2-4 (RL-) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      uM2-3 (RL+) or A39-5 (RL+) - uM2-4 (RL-) or A39-4 (RL-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY1180059Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)
      (to Rear Skid Control Sensor LH)

      OK

      The connector is securely connected.

    2. Disconnect the u4 rear skid control sensor LH connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      u4-1 (+) - u4-2 (-) Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR SKID CONTROL SENSOR LH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) 
    1. Turn the ignition switch off.
      GTY853839Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire LH (No. 2 Parking Brake Wire Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the uM2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Turn the ignition switch to ON.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      uM2-3 (RL+) - uM2-4 (RL-) Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    NG 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) 
    1. Turn the ignition switch off.
      GTY853842Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire LH (No. 2 Parking Brake Wire Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the A39 skid control ECU (brake actuator assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      uM2-4 (RL-) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      uM2-3 (RL+) or A39-5 (RL+) - uM2-4 (RL-) or A39-4 (RL-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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