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Inspection Procedure

  1. CHECK FOR DTC 
    1. Turn the ignition switch ON.
    2. Check that the VSC OFF indicator light turns on.
    3. Check for DTC (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

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

    B: REPAIR CIRCUITS INDICATED BY OUTPUT 

    A: Go to Next Step 

  2. INSPECT VSC OFF SWITCH 
    1. Remove the VSC OFF switch
    2. Measure the resistance of the switch.

    Standard resistance 

    DIAGNOSTIC NOTE CHART

    Tester Connection Switch Condition Specified Condition
    1 - 2 Pushed Below 1Ω
    1 - 2 Released 10 kΩ or higher

    NG: REPLACE VSC OFF SWITCH 

    OK: Go to Next Step 

  3. CHECK WIRE HARNESS (VSC OFF SWITCH - SKID CONTROL ECU AND BODY GROUND) 
    Fig 1: Identifying Wire Harness (VSC OFF Switch - Skid Control ECU And Body Ground)
    G05290694Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the V7 switch connector.
    2. Disconnect the S6 ECU connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      S6-12 (CSW) - V7-2 Below 1 Ω
      S8-12 (CSW) - Body ground 10 kΩ or higher
      V7-1 - Body ground Below 1Ω

    Result 

    RESULT CHART

    Result Proceed to
    Display is not NORMAL A
    Display is NORMAL B
  4. CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND) 
    Fig 2: Identifying Wire Harness (Skid Control ECU - Battery And Body Ground)
    G05290695Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the S5, S7 and S8 ECU connectors.
    2. Turn the ignition switch ON.
    3. Measure the voltage of the wire harness side connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION VOLTAGE CHART

      Tester Connection Specified Condition
      S7-6 (IG1) - S5-16 (GND4) 10 to 14 V
      S7-6 (IG1) - S5-22 (GND3) 10 to 14 V
      S7-6 (IG1) - S8-6 (GND2) 10 to 14 V
      S7-6 (IG1) - S8-31 (GND1) 10 to 14 V
      S7-6 (IG1) - Body ground 10 to 14 V
    4. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION RESISTANCE CHART

      Tester Connection Specified Condition
      S5-16 (GND4) - Body ground Below 1 Ω
      S5-22 (GND3) - Body ground Below 1 Ω
      S8-6 (GND2) - Body ground Below 1 Ω
      S8-31 (GND1) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to Next Step 

  5. CHECK MULTIPLEX COMMUNICATION SYSTEM (SKID CONTROL ECU - COMBINATION METER) 
    1. Check for open and short circuits in the multiplex communication system between the skid control ECU and combination meter.

    NG: REPAIR OR REPLACE MULTIPLEX COMMUNICATION SYSTEM 

    OK: Go to Next Step 

  6. CHECK COMBINATION METER (VSC OFF INDICATOR LIGHT) 
    1. Check the combination meter (see PROBLEM SYMPTOMS TABLE ).

    NG: REPAIR OR REPLACE COMBINATION METER 

    OK: REPLACE SKID CONTROL ECU 

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