Subaru Impreza 2002 Service Manual page 3479

GLASS/WINDOWS/MIRRORS
16.Rear Window Defogger
A: INSPECTION
CAUTION:
When wiping stain on glass off with cloth, use a
dry and soft cloth and move it in the direction of
the heat wire extension to avoid damage to the
heat wire.
1) Turn the ignition switch to ON.
2) Turn the defogger switch to ON.
3) Wrap the tips of tester pins with aluminum foil to
avoid damage to heat wire.
4) Measure the voltage at wire center with DC volt-
meter.
Standard voltage:
Approx. 6 volts
Voltage
Approx. 6 V
Approx. 12 V or 0 V
NOTE:
• If the measured value is 12 volts, heat wire is
open between wire center and positive (+) end.
• If zero volt, heat wire is open between wire cen-
ter and ground.
5) Apply positive lead of voltmeter to positive termi-
nal of voltmeter, and then move the negative lead
along the wire up to negative terminal end. If volt-
age changes from zero to several volts during
movement of lead, heat wire is open at the voltage
change point.
REAR WINDOW DEFOGGER
B: REPAIR
1) Clean the broken portion with alcohol or white
gasoline.
2) Mask both side of wire with thin film.
3) Apply conductive silver composition (DUPONT
No. 4817) to broken portion.
4) After repair, check the wire.
G6M0136
B5M1053A
Criteria
OK
Broken
GW-32
G6M0138