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Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 173 (Electronically Controlled Brake System (Except Hybrid) - Diagnostic Codes (1 Of 4)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC C0500-49: Left Front Wheel Speed Sensor Internal Electronic Failure [06/2018 - ] >> Procedure

DTC C0500-49: Left Front Wheel Speed Sensor Internal Electronic Failure [06/2018 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 250, 2023 Lexus ES 350, 2023 Lexus ES 250, and 2022 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK VEHICLE 
    1. Check if the vehicle is equipped with AVS.

      Result

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

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (SENSOR CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY799252Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Front Speed Sensor LH)

      OK

      The connector is securely connected.

    2. Disconnect the A48 front speed sensor LH connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A48-1 (FL+) - A48-2 (FL-) Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY799239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Front Speed Sensor LH)

      OK

      The connector is securely connected.

    2. Disconnect the A48 front speed sensor LH connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A48-1 (FL+) - Body ground Engine switch off Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A48 front speed sensor LH connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A48-2 (FL-) or A40-7 (FL-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT SPEED SENSOR LH. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY799239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Front Speed Sensor LH)

      OK

      The connector is securely connected.

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A48 front speed sensor LH 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
      A48-1 (FL+) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY799239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Front Speed Sensor LH)

      OK

      The connector is securely connected.

    2. Disconnect the A48 front speed sensor LH connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A48-1 (FL+) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY799251Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Front Speed Sensor LH)

      OK

      The connector is securely connected.

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A48 front speed sensor LH 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
      A48-2 (FL-) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A48 front speed sensor LH connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A48-2 (FL-) - A40-7 (FL-) Always Below 1 Ω
      A48-1 (FL+) or A40-24 (FL+) - A48-2 (FL-) - A40-7 (FL-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A48 front speed sensor LH connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A48-1 (FL+) - A40-24 (FL+) Always Below 1 Ω
      A48-1 (FL+) or A40-24 (FL+) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (SENSOR CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY808767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire with suspension control LH
      (to Front Speed Sensor LH)

      OK

      The connector is securely connected.

    2. Disconnect the z24 skid control sensor wire with suspension control LH connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      z24-1 (FL+) - z24-2 (FL-) Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  16

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      GTY834642Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire with suspension control LH
      (to Front Speed Sensor LH)

      OK

      The connector is securely connected.

    2. Disconnect the z24 skid control sensor wire with suspension control LH connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      z24-1 (FL+) - Body ground Engine switch off Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  12

  12. INSPECT SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY817244Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire with suspension control LH
      *b Front view of wire harness connector
      (to Sensor Side Connector)
      *c Front view of wire harness connector
      (to Vehicle Side Connector)
    2. Disconnect the z24 skid control sensor wire with suspension control LH connector.
    3. Disconnect the A42 skid control sensor wire with suspension control LH connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      z24-2 (FL-) or A42-5 (FL-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A42 skid control sensor wire with suspension control LH connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A42-5 (FL-) or A40-7 (FL-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT SPEED SENSOR LH. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY806432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire with Suspension Control LH)
    2. Disconnect the A42 skid control sensor wire with suspension control LH connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-6 (FL+) - Body ground Engine switch off Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH 

    Result: 

    NG 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY806432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire with Suspension Control LH)
    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A42 skid control sensor wire with suspension control LH 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
      A42-6 (FL+) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK HARNESS AND CONNECTOR (SENSOR CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY806430Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire with Suspension Control LH)
    2. Disconnect the A42 skid control sensor wire with suspension control LH connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-6 (FL+) - A42-5 (FL-) Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH 

    Result: 

    NG 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE CIRCUIT) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY806432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire with Suspension Control LH)
    2. Disconnect the A42 skid control sensor wire with suspension control LH connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-6 (FL+) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  20

    Result: 

    OK 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY834126Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control Sensor Wire with Suspension Control LH)
    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A42 skid control sensor wire with suspension control LH 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
      A42-5 (FL-) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  19

  19. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A42 skid control sensor wire with suspension control LH connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A42-5 (FL-) - A40-7 (FL-) Always Below 1 Ω
      A42-6 (FL+) or A40-24 (FL+) - A42-5 (FL-) or A40-7 (FL-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  20. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A42 skid control sensor wire with suspension control LH connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A42-6 (FL+) - A40-24 (FL+) Always Below 1 Ω
      A42-6 (FL+) or A40-24 (FL+) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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