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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Electronically Controlled Brake System - Diagnostic Codes (1 Of 6)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (except Gasoline Model) >> DTC C0500-14: Left Front Wheel Speed Sensor Circuit Short to Ground or Open [12/2023 - ] >> Procedure

DTC C0500-14: Left Front Wheel Speed Sensor Circuit Short to Ground or Open [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+ and 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING GTS (MOMENTARY INTERRUPTION) 

    Pre-procedure1

    • Select the line graph display on the GTS.
    • Check for any momentary interruption in the wire harness and connector.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FL Speed Open Front speed sensor LH open detection Normal / Under intermittent Normal: Normal
      Under intermittent: Momentary interruption      		 -
      FL Speed Sensor Voltage Open Front speed sensor LH voltage open detection Normal / Under intermittent Normal: Normal
      Under intermittent: Momentary interruption      		 -

      Chassis > Brake/EPB > Data List 

      Tester Display
      FL Speed Open
      FL Speed Sensor Voltage Open

      OK

      Normal (There are no momentary interruptions.)

      NOTE:

      Perform the above inspection before removing the sensor and connector.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK VEHICLE 

    Result

    Result Proceed to
    w/o AVS A
    w/ AVS B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY) 

    Pre-procedure1

    • Turn the ignition switch off.
    • Disconnect the B22 front speed sensor LH connector.
    • Disconnect the B34 No. 2 skid control ECU (brake actuator assembly) connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B22-2 (FL+) - B34-22 (FL+) Always Below 1 Ω Ω
      B22-2 (FL+) or B34-22 (FL+) - Body ground Always 10 kΩ or higher kΩ
      B22-1 (FL-) - B34-21 (FL-) Always Below 1 Ω Ω
      B22-1 (FL-) or B34-21 (FL-) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT) 

    Pre-procedure1

    • Reconnect the B34 No. 2 skid control ECU (brake actuator assembly) connector.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      B22-2 (FL+) - Body ground Ignition switch ON 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE FRONT SPEED SENSOR LH. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

  5. CHECK SKID CONTROL SENSOR WITH SUSPENSION CONTROL WIRE LH 

    Pre-procedure1

    • Turn the ignition switch off.
    • Disconnect the B80 and BB1 skid control sensor with suspension control wire LH.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B80-3 (FL+) - BB1-5 (FL+) Always Below 1 Ω Ω
      B80-3 (FL+) or BB1-5 (FL+) - Body ground and other terminals Always 10 kΩ or higher kΩ
      B80-1 (FL-) - BB1-6 (FL-) Always Below 1 Ω Ω
      B80-1 (FL-) or BB1-6 (FL-) - Body ground and other terminals Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPLACE SKID CONTROL SENSOR WITH SUSPENSION CONTROL WIRE LH 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WITH SUSPENSION CONTROL WIRE LH - BRAKE ACTUATOR ASSEMBLY) 

    Pre-procedure1

    • Disconnect the B34 No. 2 skid control ECU (brake actuator assembly) connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      BB1-5 (FL+) - B34-22 (FL+) Always Below 1 Ω Ω
      BB1-5 (FL+) or B34-22 (FL+) - Body ground Always 10 kΩ or higher kΩ
      BB1-6 (FL-) - B34-21 (FL-) Always Below 1 Ω Ω
      BB1-6 (FL-) or B34-21 (FL-) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT) 

    Pre-procedure1

    • Reconnect the B34 No. 2 skid control ECU (brake actuator assembly) connector.
    • Reconnect the BB1 skid control sensor with suspension control wire LH connector.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      B80-3 (FL+) - Body ground Ignition switch ON 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE FRONT SPEED SENSOR LH. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

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