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Rear Window Defogger
Function Test
1.
Check
for voltage between the positive terminal and
body ground with the
ignition
switch and defogger
switch ON
.
There
should be battery voltage.
•
If
there
is no
voltage,
check
for:
-
faulty defogger relay
.
-
faulty
defogger
switch
.
-
an open in
the
BLKlBLU,
WHT/GRN,
BLU/YEL,
or
BLK
wi
re.
•
If there is battery voltage, go to
step
2.
NEGATIVE TERMINAL
POSITIVE TERMINAL
2.
Check for cont inuity between the negative terminal
and
body ground.
If there
is no continuity, check for an open in
the
defogger ground
wire
.
3.
Touch
the voltmeter positive
probe
to
the
halfway
point of each defogger wire. and the negative
probe
to the negative terminal.
Be
careful
not to
scratch or
damage
the
defogger
wires with
the tester probe.
There
should be approximately 6 V with the ignition
switch and the defogger switch
ON
.
•
If
the voltage
is
as specified, the defogger wire is
OK
.
•
If the
voltage is not as specified,
repair
the
defog-
ger wire
.
-
If
it
is more
than 6
V,
there
is a break
in the
negative half of
the
wire.
-
If
it is
less
than 6
V,
there is a break in the
positive
half
of the
wire.
23-112
Defogger Wire Repair
NOTE:
To
make an effective repair, the
broken
section
must
be
no longer than one inch.
1.
Lightly rub
the area around
the
broken section with
fine
steel wool. then
clean it
with al cohol.
2.
Carefully mask above and below the broken portion
of the defogger
wire with cellophane
tape.
OPEN
CEUOPHANE
TAPE
3.
Mi
x
the condu ctive pai nt thoroughly. Using a small
brush,
apply a
heavy
coat
of
th
e
conductive
paint
extending about 1/8"
on both
sides of the
break.
Allow 30 minutes to
dry.
4.
Check for continuity in
th
e
repaired
wire.
5.
Apply a second coat of
paint
in the same way.
Let
it
dry th
ree hours before removing
th
e tape.
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Troubleshooting
