I have an annoying dash rattle as well, after many trial-n-error attempts to localize it I've finally found it. Mine is the bezel for the Business CD... with the little cover up, if I jam my finger into the cd bezel opening just enough to press it against the dash, the rattle goes away.... not sure if there's a way to fix that short of replacing the entire CD player though... I haven't taken out the unit yet, that may be next to see if I can tighten things up in there...