LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2007 >> Sequoia Limited, RWD >> Repair and Diagnosis >> Body & Frame >> Windows >> Windshield/Window Glass >> Window Defogger System >> On-Vehicle Inspection

On-Vehicle Inspection

  1. INSPECT DEFOGGER TIMER OPERATION (Connector connected) 
    1. Connect the positive (+) lead from the voltmeter to terminals 1, 2 and 7 of the panel switch connector and the negative (-) lead to terminal 10.
      2. Fig 1: Connecting Positive (+) Lead From Voltmeter To Terminals 1, 2 And 7 Of Panel Switch Connector And Negative (-) Lead To Terminal 10
      G04511089Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. When the switch is OFF, the voltage should be approx. 12 V.
    3. Turn the defogger switch ON and check that the indicator comes on and that the voltage is less than 1 V.
      4. Fig 2: Checking Indicator Comes On
      G04511090Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. After 15 minutes, check that the switch is OFF and the voltage is approx. 12 V.

      If operation is not as specified, replace the switch.

  2. INSPECT DEFOGGER SWITCH CIRCUIT (IN INTEGRATION CONTROL PANEL SWITCH) 

    Disconnect the connector from the panel switch and inspect the connector on the harness side, as shown in the chart below.

    Fig 3: Identifying Defogger Switch Connector Terminals
    G04511091Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    DEFOGGER SWITCH CONNECTOR TERMINALS SPECIFIED CONDITION

    Tester connection Condition Specified condition
    10 - Ground Always Continuity
    1 - Ground Always Battery voltage
    2 - Ground Ignition switch OFF or ACC No voltage
    2 - Ground Ignition switch ON Battery voltage
    7 - Ground Ignition switch OFF No voltage
    7 - Ground Ignition switch ACC or ON Battery voltage

    If the circuit is not as specified, inspect the circuit connected to other parts.

  3. INSPECT DEFOGGER WIRE 
    NOTE:
    • When cleaning the glass, use a soft, dry cloth, and wipe the glass in the direction of the wire. Take care not to damage the wires. 
    • Do not use detergents or glass cleaners with abrasive ingredients. 
    • When measuring voltage, wrap a piece of tin foil around the tip of the negative probe and press the foil against the wire with your finger, as shown in the illustration. 
    Fig 4: Wrapping Piece Of Tin Foil Around Tip Of Negative Probe
    G04511092Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch ON.
    2. Turn the defogger switch ON.
    3. Inspect the voltage at the center of each heat wire, as shown.
      VOLTAGE SPECIFIED CONDITIONS

      Voltage Criteria
      Approx. 5 V Okay (No break in wire)
      Approx. 10 V or 0 V Broken wire
      Fig 5: Inspecting Voltage At Center Of Each Heat Wire
      G04511093Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      If there is approximately 10 V, the wire is broken between the center of the wire and the positive (+) end. If there is no voltage, the wire is broken between the center of the wire and ground.

    4. Place the voltmeter positive (+) lead against the defogger wire on the battery side.
    5. Place the voltmeter negative (-) lead with the foil strip against the wire on the ground side.
    6. Slide the positive (+) lead from the battery to the ground side.
    7. The point where the voltmeter deflects from several V to zero V is the place where the defogger wire is broken.

      HINT:

      If the heat wire is not broken, the voltmeter indicates 0 V at the positive (+) end of the heat wire but gradually increases to about 12v as the meter probe moves to the other end.

      Fig 6: Measuring Heat Wire Voltage
      G04511094Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals