VEHICLE STABILITY CONTROL SYSTEM Brake Hold Operated Indicator Light Circuit

DESCRIPTION

The brake hold operated indicator light illuminates when the brake hold system is operating (vehicle stopped due to brake fluid pressure hold) and turns off when the brake hold system operation is finished (brake fluid pressure decreases).

The brake hold system may not operate depending on vehicle conditions even when the system is in standby mode and the brake hold standby indicator light is illuminated.

When a malfunction occurs in the brake control system, the brake hold operated indicator light blinks.

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

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PROCEDURE


  1. PRE-CHECK


    1. Check that the brake hold standby indicator light operates normally.

    2. If the brake hold operated indicator light does not illuminate although the brake hold standby indicator light is illuminated, check that the following brake hold operation (maintaining brake oil pressure) conditions are met.


      1. Shift position is not P or R.

      2. Driver is depressing brake pedal and vehicle is fully stopped.

      3. Driver is not depressing accelerator pedal.

      4. Vehicle is not on steep incline.

      Tech Tips

      When a malfunction occurs in the brake control system, the brake hold operated indicator light blinks.

      Result
      Proceed to
      NEXT

    NEXT

  2. INSPECT COMBINATION METER ASSEMBLY


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Perform the Active Test of the combination meter assembly (meter CPU) using the GTS.

      Click here


      Body Electrical > Combination Meter > Active Test
      Tester Display
      Indicat. Hold

    4. Check the combination meter assembly.

      OK
      The brake hold operated indicator light turns on or off in accordance with the GTS operation.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT METER / GAUGE SYSTEM Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (BRAKE HOLD OPERATED INDICATOR LIGHT)


    1. Turn the engine switch on (IG).

    2. Select the Active Test on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      BH Operated Light Brake hold operated indicator light Indicator light ON/OFF

      Observe combination meter assembly

      Vehicle condition: Vehicle stopped

    3. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      BH Operated Light Brake hold operated indicator light ON or OFF

      ON: Indicator light on

      OFF: Indicator light off

      		 -

      Chassis > ABS/VSC/TRC > Active Test
      Active Test Display
      BH Operated Light
      Data List Display
      BH Operated Light

    4. Check the operating condition of the brake hold operated indicator light when operating it using the GTS.

      Result
      Result Proceed to
      Brake hold operated indicator light in the Data List does not change using the Active Test. A
      Brake hold operated indicator light in the Data List turns ON/OFF using the Active Test. B

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

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    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    B

    USE SIMULATION METHOD TO CHECK Click here