DSD Information System
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 [11/2023 - ] >> Procedure

VSC does not Operate or VSC does not Operate Correctly [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 [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 AIRBAG SENSOR ASSEMBLY INSTALLATION 
    1. Turn the ignition switch off.
    2. Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

      Refer to INSTALLATION [11/2023 - ]

      OK

      The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.

      The yaw rate and acceleration sensor (airbag sensor assembly) is not tilted.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY. Refer to  INSTALLATION [11/2023 - ]