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Thats actually a humidity sensor that will allow the defogger to come on automatically when needed.
 

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Thats actually a humidity sensor that will allow the defogger to come on automatically when needed.
Also measures interior temperature, but yeah.

It's also not the OnStar radio, but rather the one for the remote/fob button-push reception. (The passive proximity radios are in the B-pillars.) OnStar is, IIRC, behind the overhead console button panel.
 
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