Component Tests and General Diagnostics

WINDOW / GLASS: WINDOW DEFOGGER WIRE: ON-VEHICLE INSPECTION

1. CHECK REAR WINDOW DEFOGGER OPERATION

(a) When the power switch is on (IG) and the rear window defogger switch is pressed, check that the rear window defogger operates.

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

NOTICE:
* 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.
(a) Turn the power switch on (IG).





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(b) Turn the rear window defogger switch on.

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





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Result:





HINT
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 auxiliary battery 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 ground side.

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





Text in Illustration





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

(f) Slide the positive (+) lead from the auxiliary 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.

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