Okay over the last few days I have been driven nuts by a buzzing sound. I thought it was just some batteries rattling inside my door, since it was only timing that when i moved the bateries around it stopped. I found out now that it is coming from the little speeker above the grab handle inside the truck it is buzzing. It is buzzing hard enough that you can feel air coming from the holes. What the hell is it for? Is it the onstar microphone? has anyone else had this problem. It seemed to have started around the same time i tuned the truck for the first time. Any input would be great

yes it is for the onstar. mine does make a little noise, but nothing like what you are talking about.

It just started doing it and it's driving me nuts, and it seams depending on what i listen to on the radio makes it louder or different pitched.