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Home >> Subaru >> 1982 >> GLF Automatic Trans >> Repair and Diagnosis >> Electrical >> Body Electrical >> Rear Window Defogger >> Testing >> System Testing

System Testing

  1. Check that all in-line fuses or circuit breakers are operational. Turn ignition and control switches on. Check rear window glass temperature after a few minutes. Glass should feel warm to the touch.
  2. If not, use a test lamp or voltmeter to check for battery voltage at grid feed wire. If voltage is not correct, check the wiring harness, control switch or the timer/relay.
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