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Home >> GMC >> 1997 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Power Mirror System >> Testing >> Both Power Mirrors Do Not Operate
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Both Power Mirrors Do Not Operate

  1. Disconnect power mirror switch connector. Connect test light between power mirror switch harness terminal "H" (Orange wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open in Orange wire from power mirror switch connector to fuse block.
  2. Connect test light between power mirror switch harness terminals "H" (Orange wire) and "A" (Black wire). If test light does not illuminate, repair open in Black wire from power mirror switch connector to convenience center connector. If test light illuminates, check for open in Yellow wire between each power mirror and power mirror switch. If circuit is okay, replace power mirror switch.