This is going to sound strange it self.....When I was sitting in the Tahoe waiting for the wife to get off work I had all the power off (Key in the off position) car was totally quiet, windows up. I turned the key to acc to turn on the radio and after a few minutes I thought I could hear the cd player spin up. It has not worked in a year. I couldn't pinpoint where the noise was coming from but it's in the vicinity of the cd player. I put my hand on the under side of the dash and I could feel a slight vibration!? So I turned the key to the off position and the noise stopped. I waited a few minutes turned it back on and I didn't hear it for a couple of minutes then it came on again!! there is no disc in the player. What gives? I have never herd it before that day!