VEHICLE STABILITY CONTROL SYSTEM TRC OFF Indicator Light Remains ON

DESCRIPTION

The skid control ECU is connected to the combination meter assembly via CAN communication.

Pressing the VSC OFF switch turns off TRC and pressing and holding this switch turns off TRC and VSC controls. If TRC is turned off, the TRC OFF indicator is displayed on the multi-information display.

WIRING DIAGRAM

Refer to VSC OFF Indicator Light Remains ON Click here.

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. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication system DTC is output Click here.

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

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

  2. 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.

    NG

    CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY

    OK

  3. READ VALUE USING GTS (TRC/VSC OFF MODE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Select the Data List on the GTS Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      TRC/VSC Off Mode TRC/VSC off mode/ Normal, TRC OFF, Unknown or VSC OFF

      Normal: Normal mode

      TRC OFF: TRC off mode

      Unknown: Unspecified

      VSC OFF: VSC off mode

      		 -

    4. Check the indicator light and mode condition on the GTS changes according to VSC OFF switch operation.

      Standard
      Switch Operation Mode Condition Display

      Multi-information Display

      (TRC OFF Indicator)

      		 VSC OFF Indicator Light
      Not pressed Normal Not displayed Does not come on
      Pressing the VSC OFF switch TRC OFF Displayed Does not come on
      Pressing and holding the VSC OFF switch VSC OFF Displayed Comes on
      Result
      Result Proceed to
      Indicator light and mode condition display do not change. A
      Mode condition display is normal, but indicator light does not change. B
      Indicator light and mode condition display are normal. C

    B

    INSPECT METER / GAUGE SYSTEM Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  4. PERFORM ACTIVE TEST USING GTS (MULTI-INFORMATION DISPLAY (TRC OFF INDICATOR))


    1. Select the Active Test on the GTS Click here.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      TRC(TRAC) OFF Indicator Light Multi-information display (TRC OFF indicator) Display ON/OFF

      Can be observed on the combination meter assembly

      Vehicle condition: Vehicle stopped

    2. Check the multi-information display (TRC OFF indicator) on the combination meter assembly turns on or off in accordance with the GTS operation.

      OK
      The multi-information display (TRC OFF indicator) turns on or off in accordance with the GTS operation.

    NG

    INSPECT COMBINATION METER ASSEMBLY Click here

    OK

  5. INSPECT VSC OFF SWITCH


    1. Remove the VSC OFF switch Click here.

    2. Inspect the VSC OFF switch Click here.

      OK
      The VSC OFF switch is normal.

    NG

    REPLACE VSC OFF SWITCH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (VSC OFF SWITCH - BRAKE ACTUATOR ASSEMBLY AND BODY GROUND)


    1. Disconnect the A84 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
      A84-34 (CSW) - D67-6 (+) Always Below 1 Ω
      A84-34 (CSW) or D67-6 (+) - Body ground Always 10 kΩ or higher
      D67-3 (E) - Body ground Always Below 1 Ω

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT COMBINATION METER ASSEMBLY


    1. Turn the ignition switch off.

    2. Perform an Active Test of the combination meter assembly using the GTS Click here.

    3. Check the combination meter assembly.

      OK
      The multi-information display turns on or off in accordance with the GTS operation.

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    INSPECT METER / GAUGE SYSTEM Click here