Window Defogger System (For Automatic Air Conditioning System) On-Vehicle Inspection

Vehicle Exterior. Corolla. Zre142 Aze141
Window Glass. Corolla. Zre142 Aze141

  1. CHECK REAR WINDOW DEFOGGER SYSTEM OPERATION

  2. INSPECT BACK WINDOW (DEFOGGER WIRE)

Window Defogger System (For Automatic Air Conditioning System) -- On-Vehicle Inspection



1. CHECK REAR WINDOW DEFOGGER SYSTEM OPERATION

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

    HINT:
    After 15 minutes, check that the defogger automatically turns off.


2. INSPECT BACK WINDOW (DEFOGGER WIRE)
NOTICE:
  1. When cleaning the glass, wipe the glass along the wire using a soft and dry cloth. Take care not to damage the wires.
  2. Do not use detergents or glass cleaners that have abrasive ingredients.

  3. Corolla. Zre142 Aze141.Window Glass.Power Window Control System.Window Defogger System (For Automatic Air Conditioning System) On-Vehicle Inspection
    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. Turn the ignition switch to ON.

  1. Turn the defogger switch on.



    Corolla. Zre142 Aze141.Window Glass.Power Window Control System.Window Defogger System (For Automatic Air Conditioning System) On-Vehicle Inspection

  1. Check the voltage at the center of each defogger wire, as shown in the illustration.

    Standard Voltage:
    Voltage
    		Criteria
    Approx. 5 V
    		Wire is not broken
    Approx. 10 or 0 V
    		Wire is broken
    HINT:
    If there is approximately 10 V, the wire may be faulty between the center of the wire and the wire end on the battery side. If there is no voltage, the wire may be faulty between the center of the wire and the wire end on the ground side.


    Corolla. Zre142 Aze141.Window Glass.Power Window Control System.Window Defogger System (For Automatic Air Conditioning System) On-Vehicle Inspection

  1. Place a voltmeter positive (+) lead against the defogger wire on the battery side.

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

  1. Slide the positive (+) lead from the battery side to the ground side.

  1. The point where the voltage drops from approximately 10 V to 0 V is the place where the defogger wire is broken.

    HINT:
    If the defogger wire is not broken, the voltmeter should indicate 0 V at the positive (+) end of the defogger wire but gradually increase to approximately 12 V as the meter probe moves to the other end.