you would need a volt meter and a wiring diagram. The part only takes about a half hour or so to replace, so I would just take it to the dealer. I work at a gmc dealer and have replaced a few of them on yukons for the same condition. I dont know for sure if the hummer is same but i would think that it is. I never looked at mine to see.
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2003 Pewter, SunRoof, Nav, AirHorns, 6 disc in-dash cd changer, B/U camera, ipod
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