Mine also making some kind of rattling sound behind the dash while driving. I tried removing everything but couldn't find any lose wiring.
[ame]http://youtu.be/lUEf3E2IrPo[/ame]
To my surprise after i loosen this screw the sound is gone. When I tried tightening it back, the sound comes back. It sounds like the plastic is rubbing/knocking against the metal bar behind.
What i did was to take some foam padding and stick it in between and the sound is gone.
Going to test drive it later