VEHICLE STABILITY CONTROL SYSTEM Brake Hold Standby Indicator Light Circuit

DESCRIPTION

The brake hold standby indicator light turns on if brake hold control is possible when the following conditions required for operation standby are met and the brake hold switch (electric parking brake switch assembly) is pressed while the ignition switch to ON.


WIRING DIAGRAM

B008741E06

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.

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 door is closed.

      2. The driver 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.

      Click here

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

    B

    CHECK CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED


    1. Check if the skid control ECU (brake actuator assembly) connector is securely connected.

      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. Turn the ignition switch off.

    2. Enter the following menus: Body Electrical / Combination Meter / Active Test.

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


      Body Electrical > Combination Meter > Active Test
      Tester Display
      Brake Hold Indicator

    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. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.


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

      Observe combination meter assembly

      Vehicle condition: Vehicle stopped

      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

    2. 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. A
      Brake hold standby indicator light in the Data List turns ON/OFF using the Active Test. B

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here

    B

  6. INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY


    1. B0083O1C40
      *A for LHD
      *B for RHD
      *a

      Component without harness connected

      (Brake Hold Switch (Electric Parking Brake Switch Assembly))

      Turn the ignition switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    3. Disconnect the K37 brake hold switch (electric parking brake switch assembly) connector.

    4. Check both the connector case and the terminal for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      8 (+B) - 16 (GND1) Switch pushed Below 1 Ω
      8 (+B) - 16 (GND1) Switch not pushed 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      1 (+B) - 9 (GND1) Switch pushed Below 1 Ω
      1 (+B) - 9 (GND1) Switch not pushed 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)


    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the A34 skid control ECU (brake actuator assembly) connector.

    3. Check both the connector case and the terminal for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A34-43 (HZRI) - K37-8 (+B) Always Below 1 Ω
      A34-43 (HZRI) or K37-8 (+B) - Body ground Always 10 kΩ or higher
      K37-16 (GND1) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A34-43 (HZRI) - K37-1 (+B) Always Below 1 Ω
      A34-43 (HZRI) or K37-1 (+B) - Body ground Always 10 kΩ or higher
      K37-9 (GND1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR