ELECTRONICALLY CONTROLLED BRAKE SYSTEM VSC OFF Switch Circuit

DTC Code DTC Name
VSC OFF Switch Circuit

DESCRIPTION

The skid control ECU assembly is connected to the combination meter assembly via CAN communication.

Pressing the VSC OFF switch turns off TRC operation, and pressing and holding this switch turns off TRC and VSC operation. If TRC and VSC operations are turned off, the TRC OFF message will be displayed on the multi-information display and the VSC OFF indicator light will come on.

WIRING DIAGRAM

C342819E04

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

Click here

PROCEDURE

  1. CHECK CAN COMMUNICATION SYSTEM

    1. Check if CAN communication system DTCs are output.

      for LHD:Click hereClick hereClick here

      for RHD:Click hereClick hereClick here

    Result

    Result

    Proceed to

    DTCs are not output.

    A

    DTCs are output.

    B
    B

    INSPECT CAN COMMUNICATION SYSTEM

    for LHD:Click here

    for RHD:Click here

    A

  2. CHECK IF SKID CONTROL ECU ASSEMBLY CONNECTOR IS SECURELY CONNECTED

    1. Check if the skid control ECU assembly (brake booster with master cylinder assembly) connector is securely connected.

      OK

      The connector is securely connected.

    Result

    Proceed to

    OK

    NG
    NG

    CONNECT CONNECTOR TO SKID CONTROL ECU ASSEMBLY CORRECTLY

    OK

  3. READ VALUE USING GTS (TRC/VSC OFF MODE)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Data List on 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

      VSC OFF: VSC off mode

      Unknown: Unspecified

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      TRC/VSC Off Mode

    4. Check the indicator light and mode condition on the GTS changes according to VSC OFF switch (telltale light assembly) operation.

      Standard

      Switch Operation

      Mode Condition Display

      Multi-information Display (TRC OFF Message)

      VSC OFF Indicator Light

      Not pressed

      Normal

      Not displayed

      Does not come on

      Pressing the VSC OFF switch

      TRC OFF

      Displayed

      Does not come on

      Pressing and holding the VSC OFF switch

      VSC OFF

      Displayed

      Comes on

    Result

    Result

    Proceed to

    Indicator light and mode condition display do not change.

    A

    Mode condition display is normal, but indicator light does not change.

    B

    Indicator light and mode condition display is normal.

    C
    B

    INSPECT METER / GAUGE SYSTEM

    Click here

    C

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    A

  4. PERFORM ACTIVE TEST USING GTS (MULTI-INFORMATION DISPLAY AND VSC OFF INDICATOR LIGHT)

    1. Select the Active Test on the GTS.

      Click here

      Chassis > ABS/VSC/TRC > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      TRC(TRAC) OFF Indicator Light

      Multi-information display (TRC OFF message)

      Display ON/OFF

      Observe combination meter assembly

      VSC OFF Indicator Light

      VSC OFF indicator light

      Indicator light ON/OFF

      Observe combination meter assembly

      Chassis > ABS/VSC/TRC > Active Test

      Tester Display

      TRC(TRAC) OFF Indicator Light

      Chassis > ABS/VSC/TRC > Active Test

      Tester Display

      VSC OFF Indicator Light

    2. Check the multi-information display (TRC OFF message) and VSC OFF indicator light on the combination meter assembly turns ON or OFF in accordance with the GTS operation.

      OK

      The multi-information display (TRC OFF message) and VSC OFF indicator light turns ON or OFF in accordance with the GTS operation.

    Result

    Proceed to

    OK

    NG
    NG

    INSPECT COMBINATION METER ASSEMBLYClick here

    OK

  5. INSPECT TELLTALE LIGHT ASSEMBLY

    1. Turn the power switch off.

    2. Remove the VSC OFF switch (telltale light assembly).

      Click here

    3. Inspect the VSC OFF switch (telltale light assembly).

      Click here

      OK

      The VSC OFF switch (telltale light assembly) operates normally.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE TELLTALE LIGHT ASSEMBLY

    Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - TELLTALE LIGHT ASSEMBLY)

    1. Disconnect the A110 skid control ECU (brake booster with master cylinder assembly) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A110-8 (CSW) - G43-6 (+)

      Always

      Below 1 Ω

      A110-8 (CSW) or G43-6 (+) - Body ground

      Always

      10 kΩ or higher

      G43-13 (E) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT COMBINATION METER ASSEMBLY

    1. Turn the power switch off.

    2. Perform the Active Test of the combination meter assembly (meter CPU) using the GTS.

      Click here

      Body Electrical > Combination Meter > Active Test

      Tester Display

      Meter Display 1

      Body Electrical > Combination Meter > Active Test

      Tester Display

      Indicat. VSC OFF

    3. Check the combination meter assembly.

      OK

      The multi-information display and VSC OFF indicator light turns on or off in accordance with the GTS operation.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    NG

    INSPECT METER / GAUGE SYSTEM

    Click here