Rear Defogger Heater Wire Inspection

CAUTION:
^ Heat wires are printed on the inner side of the rear glass.
To clean, use a soft cloth and wipe horizontally along the wires.
^ Never use glass cleaner or equivalent.

INSPECTION
Measure the voltage of heat wire. Repair the heat wire when the result of inspection is found abnormal.





CAUTION:
^ When measuring voltage, wind a piece of tin foil around the tip of the negative probe and press the foil against the wire with your finger.

1. Turn the starter switch ON.
2. Turn the rear defogger switch ON.
3. Measure the voltage between the three points on the heat wire and the (-) terminal with a voltmeter.




4. Check that the voltage becomes smaller from (A) to (B) to (C).
5. If there is a place where the voltage suddenly changes to 0 V, there is an OPEN CIRCUIT between there and the prior point.




6. Moving the tester probe from the position where the voltage changes to 0 Volts toward the positive side of the heat wire, make sure that where the voltage suddenly increases, then find a point where the wire is broken.