I got xm about 3 months ago and installed it where the ashtray is. I have been getting this really loud buzzing noise and i found out that this only happens when my headlights are on. WTF. anybody have any ideas what could be causeing this. I have the XM commander. It just sucks because i dont want to listen to i t at night because the buzzing is going to drive me insane. ThanX ahead of time.