WINDOW DEFOGGER WIRE ON-VEHICLE INSPECTION


  1. CHECK REAR WINDOW DEFOGGER OPERATION


    1. When the ignition switch is ON and the rear window defogger switch is pressed, check that the rear window defogger operates.

  2. INSPECT REAR WINDOW DEFOGGER WIRE (BACK WINDOW GLASS)

    Note


    • When cleaning the glass, wipe the glass along the wire using a soft and dry cloth. Take care not to damage the wires.

    • Do not use detergents or glass cleaners that have abrasive ingredients.

    • When measuring voltage, wrap a piece of tin foil around the tip of the negative tester probe and press the foil against the wire with your finger as shown in the illustration.


    1. A01EWAHE05
      Text in Illustration
      *1 Tester Probe
      *2 Tin Foil
      *3 Rear Window Defogger Wire

      Turn the ignition switch ON.

    2. Turn the rear window defogger switch on.

    3. A01ETZEE12
      Text in Illustration
      *1 Foil Strip
      *a At center

      Measure the voltage at the center of each rear window defogger wire to check the wire as shown in the illustration.

      Result
      Voltage Criteria
      4 to 6 V Wire is not broken
      11 to 14 V Wire is broken between the center and ground side end
      Below 1 V Wire is broken between the center and battery side end

      Tech Tips

      If the voltage is 11 to 14 V, the wire may be faulty between the center of the wire and the wire end on the ground side. If the voltage is below 1 V, the wire may be faulty between the center of the wire and the wire end on the battery side.

    4. A01EWWGE32
      Text in Illustration
      *1 Foil Strip
      *2 Broken Wire
      *a 11 to 14 V
      *b Below 1 V
      *c Ground Side
      *d Battery Side

      Place the positive (+) lead of the voltmeter against the rear window defogger wire on the battery side.

    5. Place the negative (-) lead of the voltmeter with the foil strip against the wire on the ground side.

    6. Slide the positive (+) lead from the battery side to the ground side. The point where the voltage drops to below 1 V from 11 to 14 V is the place where the rear window defogger wire is broken.

      Tech Tips

      If the rear window defogger wire is not broken, the voltmeter should indicate 11 to 14 V at the battery side. When the positive (+) lead is slide to the ground side, the voltage gradually decreases to below 1 V.