Subaru IMPREZA GD 2007 Series Manual page 3859

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GLASS/WINDOWS/MIRRORS
17.Rear Window Defogger
A: INSPECTION
CAUTION:
Use a dry and soft cloth when wiping dirt off the
glass. Move the cloth along the heat wire to
avoid damaging it.
1) Turn the ignition switch to ON.
2) Turn the defogger switch to ON.
3) Wrap the tips of tester probe with aluminum foil
to avoid damage to heat wire.
(1)
(1) Tester probe
(2) Aluminum foil
(3) Heat wire
(4) Press
4) Measure the voltage at heat wire center with DC
voltmeter.
Standard voltage:
Approx. 6 V
(1) Center of heat wire
Voltage
Approx. 6 V
Approx. 12 V or 0 V
NOTE:
• If the measured value is 12 volts, heat wire is
open between heat wire center and positive (+) ter-
minal of tester probe.
• If it is 0 V, the circuit is open between heat wire
center and ground.
Rear Window Defogger
5) Connect the tester probe of positive lead of volt-
meter to positive terminal of heat wire and move
tester probe of negative lead along the heat wire up
to the negative terminal end. If voltage changes
from zero to several volts during movement of
tester probe, heat wire is open at the voltage
change point.
B: REPAIR
1) Clean the broken portion with alcohol or white
gasoline.
2) Mask both side of wire with thin film.
3) Apply the conductive silver composition (DU-
PONT No. 4817) to the broken portion.
(4)
(3)
(2)
GW-00076
4) After repair, check the wire.
(1)
GW-00077
Criteria
Normal
Open
GW-30
(1)
(2)
(4)
(1) Broken portion
(2) Thin film
(3) Broken wire
(4) Conductive silver composition (DUPONT No.
4817)
(3)
GW-00078