VEHICLE STABILITY CONTROL SYSTEM TRC OFF Indicator Light does not Come ON

DESCRIPTION

Refer to TRC OFF Indicator Light Remains ON.

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WIRING DIAGRAM

Refer to TRC OFF Indicator Light Remains ON.

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CAUTION / NOTICE / HINT

Note

When replacing the 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.

      for LHD with Central Gateway ECU: Click here

      for RHD with Central Gateway ECU: Click here

      for LHD without Central Gateway ECU: Click here

      for RHD without Central Gateway ECU: Click here

      Result
      Proceed to
      DTC is not output
      DTC is output (for LHD with Central Gateway ECU)
      DTC is output (for RHD with Central Gateway ECU)
      DTC is output (for LHD without Central Gateway ECU)
      DTC is output (for RHD without Central Gateway ECU)

    DTC is output (for LHD with Central Gateway ECU)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is output (for RHD with Central Gateway ECU)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is output (for LHD without Central Gateway ECU)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is output (for RHD without Central Gateway ECU)

    CHECK CAN COMMUNICATION SYSTEM Click here

    DTC is not output

  2. CHECK HARNESS AND CONNECTOR (CSW TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the A80 skid control ECU (brake actuator assembly) connector.

    3. A01QPOVC31
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A80-33 (CSW) - Body ground VSC OFF switch (telltale light assembly) held on Below 1 Ω
      VSC OFF switch (telltale light assembly) off (Not pressed) 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT TELLTALE LIGHT ASSEMBLY Click here

    OK

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


    1. Reconnect the A80 skid control ECU (brake actuator assembly) connector.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

    6. 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
      TRC/VSC Off Mode TRC/TRAC/VSC off mode Normal, TRC OFF or VSC OFF

      Normal: Normal mode

      TRC OFF: TRC/TRAC off mode

      VSC OFF: VSC off mode

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      TRC/VSC Off Mode

    7. Check that the mode display changes according to the VSC OFF switch (telltale light assembly) operation.

      OK
      Display changes according to the switch operation.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  4. INSPECT COMBINATION METER ASSEMBLY


    1. for Segment Display Type:


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


        Body Electrical > Combination Meter > Active Test
        Tester Display
        VSC TRC Indicator

      2. Check the combination meter assembly.

        OK
        The TRC/TRAC OFF indicator light turns on or off in accordance with the GTS.

    2. for TFT Display Type:


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


        Body Electrical > Combination Meter > Active Test
        Tester Display
        Meter Display 1

      2. Check the combination meter assembly.

        OK
        The multi-information display turns on or off in accordance with the GTS operation
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    INSPECT METER / GAUGE SYSTEM Click here

  5. INSPECT TELLTALE LIGHT ASSEMBLY


    1. Remove the VSC OFF switch (telltale light assembly).

      Click here

    2. Inspect the VSC OFF switch (telltale light assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - TELLTALE LIGHT ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A80-33 (CSW) - G43-6 (+) Always Below 1 Ω
      G43-13 (E) - Body ground Always Below 1 Ω
      A80-33 (CSW) or G43-6 (+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR