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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 127 (Electronically Controlled Brake System (HV) - Diagnostic Codes (11 Of 11), Symptom Tests & Circuit Tests) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> VSC does not Operate or VSC does not Operate Correctly [12/2019 - 11/2023] >> Procedure

VSC does not Operate or VSC does not Operate Correctly [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. BRAKE PROBLEM CHECK 
    1. Check whether the slip indicator light was illuminated when VSC did not operate.

      OK

      The slip indicator light was illuminated.

      HINT: 

      When a DTC is stored, the slip indicator light is illuminated and VSC does not operate due to the fail-safe function.

    2. Check whether the vehicle speed was 15 km/h (9 mph) or less when VSC did not operate.

      OK

      The vehicle speed was 15 km/h (9 mph) or less.

      HINT: 

      VSC does not operate when the vehicle speed is 15 km/h (9 mph) or less.

    3. Check whether the vehicle was driven straight for a few seconds at 35 km/h (22 mph) or more.

      OK

      The vehicle was not driven straight for a few seconds at 35 km/h (22 mph) or more.

      HINT: 

      When the ignition switch is turned to ON, as steering angle sensor zero point calibration is not performed below 35 km/h (22 mph), VSC will not operate until the vehicle is driven straight for a few seconds at 35 km/h (22 mph) or more.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    See step  2

  2. CHECK DTC 
    1. Check the DTCs (electronically controlled brake system) that are output.

      Chassis > Brake Booster > Trouble Codes 

      Chassis > Brake/EPB > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output. A
      Electronically controlled brake system DTCs are output. B

    Result: 

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023] 

    Result: 

    See step  3

  3. CHECK TIRES 
    1. Check that the tire of each wheel is the correct size.

      Refer to INSPECTION [12/2019 - ]

      OK

      The tire of each wheel is the correct size.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE THE TIRE OF EACH WHEEL WITH THE CORRECT SIZE 

    Result: 

    OK 

    See step  4

  4. CHECK YAW RATE SENSOR INSTALLATION 
    1. Turn the ignition switch off.
    2. Check that the yaw rate sensor has been installed properly.

      Refer to INSTALLATION [12/2019 - 11/2023]

      OK

      The yaw rate sensor is tightened to the specified torque.

      The yaw rate sensor is not tilted.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    OBTAIN YAW RATE AND ACCELERATION SENSOR ZERO POINT. Refer to  UTILITY [12/2019 - 11/2023] 

    Result: 

    NG 

    INSTALL YAW RATE SENSOR CORRECTLY. Refer to  INSTALLATION [12/2019 - 11/2023]