VEHICLE STABILITY CONTROL SYSTEM(for TMMF Made) TRC OFF Indicator Light Remains ON

DESCRIPTION

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

Pressing the VSC OFF switch turns off traction control and pressing and holding the switch turns off traction and VSC control. If traction control turns off, the TRC OFF indicator light comes on.

WIRING DIAGRAM

A01VFMJE01

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly, perform 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.


      Result
      Result Proceed to
      DTC not output A
      DTC output (w/o Toyota Safety Sense) B
      DTC output (w/ Toyota Safety Sense) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. INSPECT VSC OFF SWITCH


    1. Remove the VSC OFF switch Click here.

    2. A01VKGLE06
      Text in Illustration
      *a

      Component without harness connected

      (VSC OFF Switch)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      6 (+) - 3 (E) Switch is not pushed 10 kΩ or higher
      Switch is pushed Below 1 Ω

    NG

    REPLACE VSC OFF SWITCH Click here

    OK

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


    1. Disconnect the skid control ECU connector.

    2. Disconnect the VSC OFF switch connector.

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

      Standard Resistance (for LHD with CVT, and RHD)
      Tester Connection Condition Specified Condition
      A78-25 (CSW) - F57-6 (+) Always Below 1 Ω
      A78-25 (CSW) - Body ground Always 10 kΩ or higher
      F57-3 (E) - Body ground Always Below 1 Ω
      Standard Resistance (for LHD except CVT)
      Tester Connection Condition Specified Condition
      A79-25 (CSW) - F57-6 (+) Always Below 1 Ω
      A79-25 (CSW) - Body ground Always 10 kΩ or higher
      F57-3 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. 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

    GO TO METER / GAUGE SYSTEM Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here