DEFOGGER WIRE
NOTE:
When cleaning the rear window glass, use a
dry cloth to wipe it along the wire direction.
When cleaning the glass, do not use detergent
or abrassive-containing glass cleaner.
When measuring wire voltage, use a tester
with the negative probe wrapped with a tin
foil which should be held down on the wire
by finger pressure.
1. Heat wire2. Tin foil
3. Tester probe
Fig. 21-33 NOTE:
1) Checking wire damage
a) Turn the main switch ON.
b) Turn the defogger switch ON.
c) Use a voltmeter to check the voltage at the
center of each heat wire, as illustrated.
At center
Good
Broken wire
B.roken wire
1. Voltmeter
Fig. 21-34
If the obtained voltage is lOV, the wire must be
damaged between its center and positive end. If
the voltage is zero, the wire must be damaged
between its center and earth.
2) Checking wire for damaged place
a) Set the voltmeter positive (+) lead to the
heat wire positive terminal end.
b) Set the voltmeter negative (-) lead with a
foil strip to the heat wire positive terminal
end to then move it along the wire to the
negative terminal end.
c) The place which causes the voltmeter to
fluctuate from zero to several volts is a
damaged place.
Several volts -_(( (
Fig. 21-35
If the heat wire is free from damage, the volt-
meter should point 12V at the heat wire positive
terminal end with its indication gradually
decreased toward zero to thus equal 0V at the
other terminal (earth) end.
REPAIR
[Defogger circuit]
1) Use white gasoline for cleaning.
2) Apply a masking tape at both the upper and
lower sides of a heat wire to be. repaired.
1. Mas
2. Wood spatula
3. Broken wire4. Repair agent
Fig. 21-36
3) Apply commercially-available repair agent
with a fine-tip brush.
4) Two to three minutes later, remove the
masking tapes previously applied.
5) Leave the repaired heat wire as it is for at
least 24 hours before operating the defogger
again.
21-17
