On-Vehicle Inspection

INSPECT BACK WINDOW (DEFOGGER WIRE)

Turn the engine witch on (IG).
Turn the defogger switch ON.

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

Standard

VOLTAGE CHART

Voltage	Criteria
Approx. 5 V	Wire is not broken
Approx. 10 or 0 V	Wire is broken

HINT:

If there is approximately 10V, the wire may be faulty between the center of the wire and the wire and 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.

NOTE: 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.

Fig 1: Checking Voltage At Center Of Each Defogger Wire

Place the voltmeter's positive (+) lead against the defogger wire on the battery side.
Place the voltmeter's negative (-) lead with the foil strip against the ire on the ground side.
Slide the positive (+) lead from the battery side to the ground side.
The point where the voltage drops from approximately 10 V to 0 V is 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 increases to approximately 12 V as the meter probe moves to the other end.

Fig 2: Checking Voltage Between Center Of Defogger Wire