Phantomx55
Slow
I've noticed this on my headliner but I have no idea what the hell it is. It slides back and forth and has a wire attached to it that goes in by my map lights..
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Mine has it too. Mic for onstar... I think. It is supposed to be there but if you don't like it, take it out and see what happens. Make sure you don't get followed by the secret ******, lol.