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Home >> Scion >> 2005 >> xA Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Steering Column Switches >> Abs With EBD & BA & TRAC & VSC System >> VSC Warning Light Circuit (Remains On) >> Inspection Procedure

Inspection Procedure

  1. CHECK DTC FOR VSC 
    1. Check if the DTCs for VSC are recorded (see DTC CHECK/CLEAR  ).

    Result: 

    RESULT REFERENCE

    Result Proceed to
    DTC is output A
    DTC is not output B
    1. B : Go to step   2 
    2. A : REPAIR CIRCUIT INDICATED BY OUTPUT CODE 
  2. INSPECT SKID CONTROL ECU CONNECTOR SECURELY CONNECTED 
    1. NO : CONNECT CONNECTOR TO ECU 
    2. YES : GO TO NEXT STEP. 
  3. INSPECT BATTERY 
    1. Check the battery voltage.

      Standard: 11 to 14 V 

    1. NG : INSPECT CHARGING SYSTEM 
    2. OK : GO TO NEXT STEP. 
  4. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL) 

    When using hand-held tester: 

    1. Connect the hand-held tester to the DLC3.
    2. Start the engine.
    3. Select the DATA LIST mode on the hand-held tester.
    4. Check the voltage output from the ECU displayed on the hand-held tester.
    MEASUREMENT ITEM/RANGE CONDITION

    Item Measurement Item/ Range (Display Normal Condition Diagnostic Note
    IG VOLTAGE ECU power supply voltage/NORMAL or TOO LOW NORMAL: 9.5 V or over
    TOO LOW: Below 9.5 V    		 -

    OK : NORMAL is displayed. 

    When not using hand-held tester: 

    1. Disconnect the skid control ECU connector.
    2. Turn the ignition switch ON.
    3. Measure the voltage according to the table below.

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    S1-46 (IG1) - Body ground 11 to 14 V
    Fig 1: Disconnecting Skid Control ECU Connector
    G03196497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR (IG1 CIRCUIT) 
    2. OK : GO TO NEXT STEP. 
  5. CHECK WIRE HARNESS (SKID CONTROL ECU - BODY GROUND) 
    1. Disconnect the skid control ECU connector.
    2. Measure the resistance according to the table below.

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    S1-1, 32 (GND) - Body ground Below 1 Ω
    Fig 2: Checking Wire Harness (Skid Control ECU - Body Ground)
    G03196498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR (GND CIRCUIT) 
    2. OK : GO TO NEXT STEP. 
  6. CHECK VSC WARNING LIGHT 

    When using hand-held tester: 

    1. Connect the hand-held tester to the DLC3 and start the engine.
    2. Select the "VSC WARN LIGHT" in the ACTIVE TEST and operate the VSC warning lamp on the hand-held tester.
    3. Check that "ON" and "OFF" of the VSC warning lamp can be shown on the combination meter by the hand-held tester.
    VEHICLE CONDITION / TEST DETAILS REFERENCE

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

    When not using hand-held tester: 

    1. Turn the ignition switch OFF and disconnect the connector from the skid control ECU.
    2. Turn the ignition switch ON.
    3. Check that the VSC warning lamp turns off.

      OK : VSC warning lamp turns off. 

      Fig 3: Disconnecting Connector From Skid Control ECU
      G03196499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : CHECK AND REPAIR VSC WARNING LAMP CIRCUIT 
    2. OK : REPLACE BRAKE ACTUATOR ASSY (See  REPLACEMENT  ) 
    NOTE: When replacing the brake actuator assy, perform the zero point calibration (see CALIBRATION  ).
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