ELECTRONICALLY CONTROLLED BRAKE 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 is turned on while the engine switch is on (IG).


WIRING DIAGRAM

B005WB7E01

CAUTION / NOTICE / HINT

Note

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 is pushed, check that the brake hold function operation conditions are met.


      1. The driver side door is closed.

      2. The driver side seat belt is fastened.

      3. The system is normal.

      Tech Tips

      If a malfunction occurs in one of the following systems, the brake hold operated indicator light will blink. If this occurs, perform troubleshooting on the malfunctioning system.


      • Brake system

      • Electric parking brake system

      • SFI system

      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. 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

      for Sport Package:


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

      except Sport Package:


      Body Electrical > Combination Meter > Active Test
      Tester Display
      Multi Display Default Screen

    4. Check the combination meter assembly.

      OK
      for Sport Package
      The brake hold standby indicator light turns on or off in accordance with the GTS operation
      except Sport Package
      The multi-information display 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. 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 BRAKE HOLD SWITCH


    1. B005RIVC01
      *a

      Component without harness connected

      (Brake Hold Switch)

      Turn the engine switch off.

    2. Disconnect the A brake hold switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-3 (+B) - A-4 (E) Switch pushed Below 1 Ω
      A-3 (+B) - A-4 (E) Switch not pushed 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE HOLD SWITCH Click here

    OK

  7. INSPECT SWITCH WIRE


    1. Disconnect the G7 switch wire.

    2. Disconnect the A brake hold switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G7-3(+B) - A-3(+B) Always Below 1 Ω
      G7-3(+B) or A-3(+B) - Body ground Always 10 kΩ or higher
      G7-6(E) - A-4(E) Always Below 1 Ω
      G7-6(E) or A-4(E) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SWITCH WIRE Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE HOLD SWITCH)


    1. Disconnect the A9 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
      A9-3 (PKB) - G7-3 (+B) Always Below 1 Ω
      A9-3 (PKB) or G7-3 (+B) - Body ground Always 10 kΩ or higher
      G7-6 (E) - 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