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VSC Warning Light Remains ON: Wiring Diagram

Fig 1: VSC Warning Light Remains On Wiring Diagram
G04063919Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. INSPECT SKID CONTROL ECU CONNECTOR 
    1. Check that each ECU connector is properly installed.

    OK : Each ECU connector is properly installed. 

    NG : CONNECT CONNECTOR TO ECU CORRECTLY 

    OK : Go To Next Step 

  2. CHECK FOR DTC 
    1. Turn the ignition switch ON.
    2. Check that the VSC TRAC warning light illuminates.
    3. Check if the same DTCs are recorded.

    Result: 

    RESULT REFERENCE

    Result Proceed to
    DTC is not output A
    DTC is output B

    B : REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

    A : Go To Next Step 

  3. CHECK VSC TRAC WARNING LIGHT REMAIN ON 

    NG : END 

    OK : Go To Next Step 

  4. INSPECT BATTERY 

    Result: 

    RESULT REFERENCE

    Result Proceed to
    Battery voltage is OK (when using intelligent tester) A
    Battery voltage is OK (when not using intelligent tester) B
    Battery voltage is NG C

    B : Go to step  6

    C : RECHARGE OR REPLACE BATTERY 

    A : Go To Next Step 

  5. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (VSC TRAC WARNING LIGHT) 
    1. Select the ACTIVE TEST, generate a control command, and then check that the VSC TRAC warning light operates.

    Skid control ECU assembly 

    ACTIVE TEST REFERENCE CHART

    Item Vehicle Condition / Test Details Diagnostic Note
    VSC WARN LIGHT Turn VSC warning light ON / OFF Observe combination meter

    OK : VSC TRAC warning light on or off. 

    OK : REPLACE SKID CONTROL ECU ASSEMBLY 

    NG : Go To Next Step 

  6. CHECK VSC TRAC WARNING LIGHT 
    1. Disconnect the A40 ECU connector.
    2. Turn the ignition switch ON.
    3. Using a service wire, connect terminal WA to GND3 or GND4 of the A40 ECU connector. Check the VSC TRAC warning light.

      OK : VSC TRAC warning light turns off. 

    4. Turn the ignition switch OFF.
    5. Remove the service wire.
    6. Turn the ignition switch ON. Check the VSC TRAC warning light.

    OK : VSC TRAC warning light illuminates. 

    OK : REPLACE SKID CONTROL ECU ASSEMBLY 

    NG : Go To Next Step 

  7. CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - COMBINATION METER) 

    OK : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK : REPLACE COMBINATION METER 

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