Heated Glass Element: Testing and Inspection

Rear Window Defogger

INSPECTION

Step 1:

1. CHECK WITH SUBARU SELECT MONITOR

CAUTION: Check that the rear window defogger timer is in initial setting or customize setting before performing inspection.

2. HEAT WIRE 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.




4. Measure the voltage at heat wire center with DC voltmeter.

NOTE:
- If the measured value is 12 volts, heat wire is open between heat wire center and positive (+) terminal of tester probe.
- If it is 0 V, the circuit is open between heat wire center and ground.

5. Connect the tester probe of positive lead of voltmeter 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.