Subaru Legacy 2004 Service Manual page 3759

17.Rear Window Defogger
A: INSPECTION
1. WITH SUBARU SELECT MONITOR
CAUTION:
Check that the rear window defogger timer is in initial setting or customize setting before inspection.
Step
1 CHECK INPUT SIGNAL TO BODY INTE-
GRATED UNIT.
When the rear window defogger switch is oper-
ated, check the input signal using Subaru
Select Monitor.
1) Connect the Subaru Select Monitor to data
link connector.
2) Turn the ignition switch to ON.
3) Select {Body Integrated Unit} from «Main
Menu».
4) Select {Current Data Display & Save}.
5) When the rear window defogger switch is
set to ON, check the input signal.
2. HEAT WIRE INSPECTION
CAUTION:
When wiping stain on glass off with cloth, use a
dry and soft cloth and move it along the heat
wire 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 probe with aluminum foil
to avoid damage to heat wire.
(1)
(1) Tester probe
(2) Aluminum foil
(3) Heat wire
(4) Push
4) Measure the voltage at heat wire center with DC
voltmeter.
Rear Window Defogger
After rear defogger switch is
set to ON, does it turn to OFF
in 15 minutes? Or does it
repeat 15 minutes operation
and 2 minutes stop?
(4)
(3)
(2)
GW-00076
GW-31
Check
END.
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 zero volt, heat wire is open between wire cen-
ter and ground.
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.
GLASS/WINDOWS/MIRRORS
Yes No
Replace the body
integrated unit.
<Ref. to SL-46,
REMOVAL, Body
Integrated Unit.>
(1)
GW-00077
Criteria
Normal Operation
Broken