VEHICLE STABILITY CONTROL SYSTEM Brake Hold Standby Indicator Light Circuit

DESCRIPTION

When the brake hold switch (electric parking brake switch assembly) is turned on with the engine switch turned on (IG), the brake hold standby indicator light illuminates when brake hold operation is possible.

WIRING DIAGRAM

B002E0AE01

CAUTION / NOTICE / HINT

Tech Tips

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

Click here

PROCEDURE


  1. PRE-CHECK


    1. If the brake hold standby indicator light does not illuminate even though the brake hold switch (electric parking brake switch assembly) is pushed, check that the brake hold function operation conditions are met.


      1. The driver's door is closed.

      2. Driver's seat belt is fastened.

      3. The system is normal.

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output.

      for LHD: Click here

      for RHD: Click here

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    B

    CHECK CAN COMMUNICATION SYSTEM for LHD: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD: Click here

    A

  3. CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED


    1. Jiggle the skid control ECU (brake actuator assembly) connectors and wire harnesses vertically and horizontally and check the brake hold standby indicator light status.

      OK
      The connector is securely connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY

    OK

  4. INSPECT COMBINATION METER ASSEMBLY


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch off.

    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. Brake Hold

    4. Check the combination meter assembly.

      OK
      The brake hold standby 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

  5. PERFORM ACTIVE TEST USING GTS (BRAKE HOLD STANDBY 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 Standby Light Brake hold standby indicator light Indicator light ON/OFF Observe combination meter

    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 Standby Light Brake hold standby indicator light ON or OFF

      ON: Indicator light on

      OFF: Indicator light off

      		 -

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

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

      Result
      Result Proceed to
      Brake hold standby indicator light in the Data List does not change using the Active Test. (for RHD) A
      Brake hold standby indicator light in the Data List does not change using the Active Test. (for LHD) B
      Brake hold standby indicator light in the Data List turns ON/OFF using the Active Test. C

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

  6. INSPECT SATELLITE SWITCH SET


    1. Turn the engine switch off.

    2. Remove the brake hold switch (satellite switch set).

      Click here

    3. Inspect the brake hold switch (satellite switch set).

      Click here

      OK
      The brake hold switch (satellite switch set) operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SATELLITE SWITCH SET Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SATELLITE SWITCH SET)


    1. Disconnect the A52 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A52-3 (PKB) - K129-7 (+B) Always Below 1 Ω
      A52-3 (PKB) or K129-7 (+B) - Body ground Always 10 kΩ or higher
      K129-4 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK (for RHD)
      OK (for LHD)
      NG

    OK (for RHD)

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK (for LHD)

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR