VEHICLE STABILITY CONTROL SYSTEM TRC OFF Indicator Light Remains ON

DTC Code DTC Name
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

C270525E98

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

    INSPECT CAN COMMUNICATION SYSTEM

    w/ Central Gateway ECU:Click here

    w/o Central Gateway ECU:Click here

    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

    CONNECT CONNECTOR TO ACTUATOR CORRECTLY

    OK

  3. CHECK BATTERY

    1. Check the battery voltage.

      Standard Voltage

      11 to 14 V

      Result

      Proceed to

      OK

      NG
    NG

    CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY

    for 1ND-TV:Click here

    for 1NR-FE:Click here

    for 8NR-FTS:Click here

    for 1ZR-FAE:Click here

    for 1ZR-FE:Click here

    for 2ZR-FE:Click here

    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

    INSPECT COMBINATION SWITCH ASSEMBLYClick here

    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.

      Tip:

      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

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    NG

    INSPECT METER / GAUGE SYSTEM

    Click here

  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

    REPLACE COMBINATION SWITCH ASSEMBLY

    Click here

    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
      Tip:

      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

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR