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Home >> Infiniti >> 1992 >> G20 Automatic >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Heated Glass/Defoggers >> Defogger - Rear Window >> Trouble Shooting >> Rear Defogger Does Not Activate Or Does Not Go Off After Activating

Rear Defogger Does Not Activate Or Does Not Go Off After Activating

  1. Turn ignition switch to ON position. Turn defogger switch to OFF position. Measure voltage between time control unit harness connector terminals No. 4 and 15. Approximately 12 volts should be present.
  2. Turn defogger switch to ON position and repeat step 1). Zero voltage should be present. If voltage is as specified, check rear window defogger wiring and relay. If voltage is not as specified, go to next step.
  3. Turn ignition switch to OFF position. Disconnect time control unit connector. Check continuity between control unit harness connector terminals No. 3 and 15. With defogger switch in OFF position, no continuity should be present. With defogger switch in ON position, continuity should be present.
  4. If continuity is as specified, replace control unit. If continuity is not as specified, check rear window defogger switch and harness continuity between time control unit and rear window defogger switch.
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