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

WIRING DIAGRAM

A01ISV9E08

INSPECTION PROCEDURE

Note

When replacing the skid control ECU (brake actuator assembly), perform the engine variant learning Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

      Result
      Result Proceed to
      CAN communication system DTC is not output. A
      CAN communication system DTC is output. B

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  2. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


    1. Check if the skid control ECU connector is securely connected.

      OK
      The connector is securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    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. Start the engine.

    4. Select the Data List on the intelligent tester Click here.

      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

      TRC OFF: TRC off mode

      VSC OFF: VSC off mode

      		 -

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

      OK
      Display changes according to switch operation.

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part Click here.


    NG

    Click here

    OK

    GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

  4. INSPECT VSC OFF SWITCH


    1. A01IU4VE01

      Remove the VSC OFF switch Click here.

    2. 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 pushed in Below 1 Ω
      Switch is not pushed in 10 kΩ or higher

    NG

    REPLACE VSC OFF SWITCH Click here

    OK

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


    1. Disconnect the skid control ECU connector.

    2. Disconnect the VSC OFF switch connector.

    3. A01IN6DE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2

      Front view of wire harness connector

      (to VSC OFF Switch)
      *3 for AD Series Engine, 1WW
      *4 for ZR Series Engine

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A52 or A54-17 (CSW) - H66-6 (+) Always Below 1 Ω
      A52 or A54-17 (CSW) - Body ground Always 10 kΩ or higher
      H66-3 (E) - Body ground Always Below 1 Ω

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here