I had the typical passenger visor buzz. In addition I had a buzz that sounded like it was coming from the dash somewhere around the triple guage cluster. Last night I discovered that the buzz was actually coming from the rear view mirror! The buzz is recreatable by tapping on the right side of the mirror. If I grab the right side of the mirror while in motion, the buzzing goes away, so It seems to be a problem in the casing. We will see what the dealership says, but for those trying to track these things down, here is another potential source.

 

Thanks, I think i have the same buzz...its the only real rattle I get....accasionaly the visor one, but only at sustained high RPMs. Ill check that out as its been bugging me for a while.