Initial Inspection and Diagnostic Overview

INSPECT DEFOGGER SWITCH OPERATION




a. Connect the positive (+) lead from the voltmeter to terminal 5 and the negative (-) lead from the voltmeter to terminal 4.
b. When the switch is OFF, the voltage should be approx. 12 V.




c. When the switch is ON, check that the indicator light lights up and that the voltage is less than 1 V.
d. W/ Timer:
After 15 minutes, check that the switch is OFF and the voltage is approx. 12 V.

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, wind a piece of tin foil around the top of the negative probe and press the foil against the wire with your finger.

a. Turn the ignition switch ON.
b. Turn the defogger switch ON.







c. Inspect the voltage at the center of each heat wire.

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.




d. Place the voltmeter positive (+) lead against the defogger positive (+) terminal.
e. Place the voltmeter negative (-) lead with the foil strip against the heat wire at the positive (+) terminal end and slide it toward the negative (-) terminal end.
f. The point where the voltmeter deflects from zero to several V is the place where the heat 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 12 V as the meter probe is moved to the other end.

IF NECESSARY, REPAIR DEFOGGER WIRE




a. Clean the broken wire tips with grease, wax and silicone remover.
b. Place the masking tape along both sides of the wire to be repaired.
c. Thoroughly mix the repair agent (Dupont paste No. 4817).




d. Using a fine tip brush, apply a small amount of agent to the wire.
e. After a few minutes, remove the masking tape.
f. Do not repair the defogger wire for at least 24 hours.