Note:
- - When cleaning the glass, use a soft, dry cloth, wipe the glass parallel to the heater wires.
- - Be careful not to damage the wires. It is forbidden to use detergents and compositions with abrasive particles.
- - When measuring voltage, wrap the negative terminal of the tester with foil and press the edge of the foil against the wire with your finger.
Checking the rear window defroster switch
1. Check for broken wires.
A) Turn on the ignition and rear window defroster.
b) Measure the voltage at the center of each fuser wire as shown.
V) If the voltage is about 5 V, then the wire is normal.
G) If the voltage is about 10 V, then there is a wire break between the middle and the side bus (+) thermoelement.
d) If the voltage is about 0 V, then there is a wire break between the middle and "earth".
2. Search for a break in the wire.
A) Connect "plus" voltmeter to the side rail (+) thermoelement.
b) Wrap "minus" foil voltmeter. Connect the foil to the fuser wire at the side rail (+) and slowly move it to the opposite end (To "earth"),
V) The point at which the voltmeter needle deviates from zero by a few volts is the break point.
Note: if there is no wire break, then the voltmeter shows 0 V at the side rail (+) thermocouple and, when moving "-" contact of the voltmeter to the opposite end of the wire, the voltage will gradually increase to about 12 V.
3. Wire repair.
A) Clean the ends of the wire at the broken point with a solvent and stick protective tape on both sides of the wire.
b) Mix the repair compound thoroughly and, using a fine-tipped brush, apply a drop of the substance to the wire.
Repair Compound: DUPONT PASTE #4817 or equivalent.
V) After a few minutes, remove the protective tape and leave to harden for 24 hours.