VEHICLE STABILITY CONTROL SYSTEM(for TMC Made) TRC OFF Indicator Light does not Come ON

DESCRIPTION

The brake actuator assembly (skid control ECU) is connected to the combination meter via CAN communication.

Pressing the VSC OFF switch turns off traction control and pressing and holding this switch turns off traction and VSC controls. If traction control turns OFF, the TRC OFF indicator light will come on.

If VSC and traction control turns OFF, the TRC OFF indicator and VSC OFF indicator light will come on.

The TRC OFF indicator light is illuminated when the TRC control is prohibited by operating the VSC OFF switch.

By Pressing the VSC OFF switch for a short time, the TRC OFF mode is activated, and the TRC control is prohibited, and the TRC OFF indicator light in the combination meter is illuminated.

By pressing the VSC OFF switch for 3 seconds or longer, the VSC OFF mode is activated, the VSC and TRC controls are prohibited, and both the VSC OFF indicator light and the TRC OFF indicator light are illuminated.

WIRING DIAGRAM

Refer to TRC OFF Indicator Light Remains ON Click here

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly, perform zero point calibration Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    CHECK CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK HARNESS AND CONNECTOR (CSW TERMINAL)


    1. Turn the ignition switch off.

    2. A01VF5WE01
      Text in Illustration
      *A except LHD with CVT
      *B for LHD with CVT
      *a

      Front view of wire harness connector

      (to skid control ECU)

      Disconnect the skid control ECU connector.

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

      Standard Resistance (except LHD with CVT)
      Tester Connection Switch Condition Specified Condition
      A54-30 (CSW) - Body ground VSC OFF Switch held ON Below 1 Ω
      A54-30 (CSW) - Body ground VSC OFF Switch OFF (Not pressed) 10 kΩ or higher
      Standard Resistance (for LHD with CVT)
      Tester Connection Switch Condition Specified Condition
      A56-30 (CSW) - Body ground VSC OFF Switch held ON Below 1 Ω
      A56-30 (CSW) - Body ground VSC OFF Switch OFF (Not pressed) 10 kΩ or higher

    4. Reconnect the skid control ECU connector.


    NG

    INSPECT VSC OFF SWITCH Click here

    OK

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


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

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

    6. According to the display on the tester, read the Data List.

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

      Normal: Normal mode

      TRC OFF: TRC off mode

      VSC OFF: VSC off mode

      		 -

    7. Check that the mode display changes according to the VSC OFF switch operation.

      OK
      Display changes according to the switch operation.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  4. INSPECT VSC OFF SWITCH


    1. Remove the VSC OFF switch Click here.

    2. Inspect the VSC OFF switch Click here.

    3. Reconnect the VSC OFF switch connector.


    NG

    REPLACE VSC OFF SWITCH Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH)


    1. Disconnect the skid control ECU (brake actuator assembly) and the VSC OFF switch connector.

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

      Standard Resistance (except LHD with CVT)
      Tester Connection Condition Specified Condition
      A54-30 (CSW) - F57-6 Always Below 1 Ω
      F57-3 - Body ground Always Below 1 Ω
      A54-30 (CSW) - Body ground Always 10 kΩ or higher
      Standard Resistance (for LHD with CVT)
      Tester Connection Condition Specified Condition
      A56-30 (CSW) - F57-6 Always Below 1 Ω
      F57-3 - Body ground Always Below 1 Ω
      A56-30 (CSW) - Body ground Always 10 kΩ or higher

    3. Reconnect the skid control ECU (brake actuator assembly) connector and the VSC OFF switch connector.


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR