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Home >> GMC >> 1997 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window System >> Testing >> Window Switch Does Not Illuminate

Window Switch Does Not Illuminate

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  1. Put headlight and panel dimmer switch in PARK position. Disconnect suspect window switch. Connect test light between Brown wire and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open in Brown wire.
  2. Connect test light between Brown and Black wires. If test light does not illuminate, repair open in Black wire. If test light illuminates, replace suspect switch.
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