DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control System - Service Information >> BRAKE ACTUATOR (for Gasoline Model) >> On-Vehicle Inspection [12/2019 - ] >> Procedure

On-Vehicle Inspection [12/2019 - ]: Procedure

  1. INSPECT ACTUATOR MOTOR OPERATION 
    1. Start the engine and run it at idle.
    2. Turn the motor relay on and check for actuator motor operation sounds.

      Chassis > Brake/EPB > Active Test 

      Tester Display
      Motor Relay
      NOTE:

      Do not keep the motor relay on continuously for more than 5 seconds. If it needs to be operated repeatedly, wait an interval of more than 20 seconds between operations.

    3. Turn the motor relay off.
    4. Fully depress the brake pedal and hold it for approximately 15 seconds. Check that the initial brake pedal depth is maintained for the entire 15 seconds.
    5. Turn the motor relay on and check that the brake pedal does not pulsate.
      NOTE:

      Do not keep the motor relay on continuously for more than 5 seconds. If it needs to be operated repeatedly, wait an interval of more than 20 seconds between operations.

    6. Turn the motor relay off and release the brake pedal.
  2. INSPECT FRONT RIGHT WHEEL OPERATION 
    1. Start the engine and run it at idle.
    2. Depress the brake pedal and hold it.
      NOTE:

      Do not turn on a solenoid in a manner different than that shown in the following steps.

    3. Turn the SFRH and SFRR solenoids on simultaneously and check that the brake pedal cannot be depressed further.

      Chassis > Brake/EPB > Active Test 

      Tester Display
      ABS Solenoid
      NOTE:

      Each solenoid operates for 2 seconds and turns off automatically. If a solenoid needs to be operated repeatedly, wait an interval of more than 20 seconds between operations.

    4. Turn the SFRH and SFRR solenoids off simultaneously and check that the brake pedal can be depressed.
    5. With the brake pedal still depressed, turn the motor relay on and check that the brake pedal rises.

      Chassis > Brake/EPB > Active Test 

      Tester Display
      Motor Relay
      NOTE:

      Do not keep the motor relay on continuously for more than 5 seconds. If it needs to be operated repeatedly, wait an interval of more than 20 seconds between operations.

    6. Turn the motor relay off and release the brake pedal.
  3. INSPECT OTHER WHEEL OPERATION 
    1. Using the same procedure, check the solenoids for the other wheels.

      HINT: 

      • Front left wheel: SFLH, SFLR
      • Rear right wheel: SRRH, SRRR
      • Rear left wheel: SRLH, SRLR
Diesel-Data.com