VEHICLE STABILITY CONTROL SYSTEM TRC OFF Indicator Light Remains ON

DESCRIPTION

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

Pressing the VSC OFF switch (combination switch assembly) turns off TRC, and pressing and holding this switch turns off TRC and VSC. If TRC control is turned off, the TRC OFF indicator light illuminates (except Multi-information Display (Color Type)) or the TRC OFF message will be displayed on the multi-information display (for Multi-information Display (Color Type)).

WIRING DIAGRAM

B0041W8E98

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output.

      w/ Central Gateway ECU: Click here

      w/o Central Gateway ECU: Click here

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    B
    A
  2. CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED


    1. Check if the skid control ECU (brake actuator assembly) connector is securely connected.

      OK
      The connector is securely connected.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. CHECK BATTERY


    1. Check the battery voltage.

      Standard Voltage
      11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. READ VALUE USING GTS (TRC/VSC OFF Mode)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Select the Data List using the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      TRC/VSC Off Mode TRC/VSC off mode Normal, TRC OFF, Unknown or VSC OFF

      Normal: Normal mode

      TRC OFF: TRC off mode

      Unknown: Unspecified

      VSC OFF: VSC off mode

      -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      TRC/VSC Off Mode
    4. Using the GTS, check that the switch condition displayed on the GTS changes according to VSC OFF switch (combination switch assembly) operation.

      OK
      The GTS display changes according to VSC OFF switch (combination switch assembly) operation.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  5. INSPECT COMBINATION METER ASSEMBLY


    1. Turn the ignition switch off.

    2. Perform an Active Test of the combination meter assembly using the GTS (except Multi-information Display (Color Type)).

      Click here


      Body Electrical > Combination Meter > Active Test
      Tester Display
      VSC TRC Indicator
    3. Perform an Active Test of the combination meter assembly using the GTS (for Multi-information Display (Color Type)).

      Click here


      Body Electrical > Combination Meter > Active Test
      Tester Display
      Meter Display 1
    4. Check the combination meter assembly.

      OK
      The TRC OFF indicator light (except Multi-information Display (Color Type)) or the multi-information display (TRC OFF message) (for Multi-information Display (Color Type)) turns on or off in accordance with the Active Test operation.

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK
    NG
  6. INSPECT COMBINATION SWITCH ASSEMBLY


    1. Turn the ignition switch off.

    2. Inspect the VSC OFF switch (combination switch assembly).

      Click here

      OK
      The VSC OFF switch (combination switch assembly) is normal.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  7. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - COMBINATION SWITCH ASSEMBLY)


    1. Disconnect the A97 skid control ECU (brake actuator assembly) connector.

    2. Disconnect the E136 VSC OFF switch (combination switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A97-9 (CSW) - E136-2 (+) Always Below 1 Ω
      A97-9 (CSW) or E136-2 (+) - Body ground Always 10 kΩ or higher
      E136-3 (E) - Body ground Always Below 1 Ω

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK
    NG