ELECTRONICALLY CONTROLLED BRAKE SYSTEM VSC OFF Switch Circuit

DESCRIPTION

The skid control ECU (brake booster with master cylinder 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

A01KREME23
*1 VSC OFF Switch
*2 Combination Meter Assembly
*3 Skid Control ECU (Brake Booster with Master Cylinder Assembly)
*4 CAN Communication Line

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.

      Click here

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

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


    1. Check if the skid control ECU (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 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, VSC Expert Mode or VSC OFF

      Normal: Normal mode

      TRC OFF: TRC off mode

      VSC Expert Mode: VSC expert mode

      VSC OFF: VSC off mode

      		 -

      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 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 are normal. C

    B

    INSPECT METER / GAUGE SYSTEM Click here

    C

    USE SIMULATION METHOD TO CHECK Click 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 turn ON or OFF in accordance with GTS operation.

      OK
      The multi-information display (TRC OFF message) and VSC OFF indicator light turn ON or OFF in accordance with GTS operation.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT COMBINATION METER ASSEMBLY Click here

    OK

  5. INSPECT VSC OFF SWITCH


    1. A01KR3HC05
      *a

      Component without harness connected

      (VSC OFF Switch)

      Turn the power switch off.

    2. Disconnect the E47 VSC OFF switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      9 (+) - 6 (E) Switch pushed Below 1 Ω
      9 (+) - 6 (E) Switch not pushed 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE VSC OFF SWITCH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - VSC OFF SWITCH)


    1. Disconnect the A144 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
      A144-8 (CSW) - E47-9 (+) Always Below 1 Ω
      A144-8 (CSW) or E47-9 (+) - Body ground Always 10 kΩ or higher
      E47-6 (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 the parts.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 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 turn on or off in accordance with GTS 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 the parts.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    NG

    INSPECT METER / GAUGE SYSTEM Click here