VEHICLE STABILITY CONTROL SYSTEM Downhill Assist Control Indicator Light Remains ON

DESCRIPTION

When the downhill assist control switch is turned on, the downhill assist control function is available and the downhill assist control indicator light illuminates.

WIRING DIAGRAM

Refer to Downhill Assist Control Indicator Light does not Come ON.

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CAUTION / NOTICE / HINT

Note

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

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PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output.

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      Result
      Proceed to
      DTC is not output
      DTC is output

    DTC is output

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is not output

  2. CHECK IF SKID CONTROL ECU 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 ECU CORRECTLY

    OK

  3. INSPECT DOWNHILL ASSIST CONTROL SWITCH


    1. Turn the ignition switch off.

    2. Remove the downhill assist control switch.

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    3. Inspect the downhill assist control switch.

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      OK
      The downhill assist control switch operates normally.
      Result
      Result
      OK
      NG

    NG

    REPLACE DOWNHILL ASSIST CONTROL SWITCH Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - DOWNHILL ASSIST CONTROL SWITCH)


    1. Disconnect the A4 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
      A4-27 (HDCS) - G24-4 Always Below 1 Ω
      A4-27 (HDCS) or G24-4 - Body ground Always 10 kΩ or higher
      G24-1 - Body ground Always Below 1 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. READ VALUE USING GTS (DOWNHILL ASSIST CONTROL LIGHT)


    1. Reconnect the A4 skid control ECU (brake actuator assembly) connector.

    2. Reconnect the G24 downhill assist control switch connector.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

    6. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    7. According to the display on the GTS, read the Data List.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Downhill Assist Control Light Downhill assist control indicator light ON or OFF

      OFF: Downhill assist control indicator light off

      ON: Downhill assist control indicator light on

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Downhill Assist Control Light

    8. Check the GTS display condition of the Downhill assist control indicator light.

      Result
      Proceed to
      Display of the Data List remains OFF
      Display of the Data List remains ON

    Display of the Data List remains OFF

    INSPECT METER / GAUGE SYSTEM Click here

    Display of the Data List remains ON

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here