What is this for?

[Jamal]

Is this the microphone for Onstar? It is right above my head on the drivers side.
The damn thing has a slight humming coming from it that is driving me nutty.

 

[Jamal]

lookie what I stumbled across! wow

http://www.tahoeyukonforum.com/forum/showthread.php?t=4859

 

[sumo]

Yay search worked?

 

[Jamal]

It took a while...whittling down to the right search parameters.

 

[sumo]

sometimes the search on here sends you off in the other direction