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

DESCRIPTION

The skid control ECU (brake actuator assembly) 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 controls turn off, the TRC OFF indicator and VSC OFF indicator lights 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)


    1. Turn the ignition switch off.

    2. Replace the combination meter assembly Click here.


    NG

    INSPECT VSC OFF SWITCH Click here

    OK

  3. INSPECT COMBINATION METER ASSEMBLY


    1. Connect the intelligent tester to the DLC3.

    2. Perform Active Test of the combination meter assembly using the intelligent tester Click here.

      OK
      The SLIP indicator light turns on or off in accordance with the intelligent tester.
      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 Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY 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 (BRAKE ACTUATOR ASSEMBLY - VSC OFF SWITCH)


    1. Disconnect A54*1 or A56*2 the skid control ECU (brake actuator assembly) control ECU (brake actuator assembly) connector and the F57 VSC OFF switch connector.


      • *1: except LHD with CVT

      • *2: for LHD with CVT

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

      Standard Resistance (Check for Open)
      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
      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
      Standard Resistance (Check for Short)
      except LHD with CVT
      Tester Connection Condition Specified Condition
      A54-30 (CSW) or F57-6 - Body ground Always 10 kΩ or higher
      for LHD with CVT
      Tester Connection Condition Specified Condition
      A56-30 (CSW) or F57-6 - Body ground Always 10 kΩ or higher

    3. Reconnect the A54*1 or A56*2 skid control ECU (brake actuator assembly) connector and the VSC OFF switch connector.


      • *1: except LHD with CVT

      • *2: for LHD with CVT


    OK

    CHECK INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR