Originally Posted by crow
Agree, that would be ideal.
At this point all you can do is troubleshoot. Take out inside panel and play the music, see if it still rattles. No rattles -> the problem is the panel you just took out. Rattles -> the problem is in the door. Observe and see where it's coming from. Retighten screws as needed and add felt tape. That's what I would do if I had to do it myself. If you're under warranty the dealer should be doing this I believe? If he refused go see another dealer. He they all refuse complain to BMW... You can also seek help in aftermarket car audio forums, should be a rather common issue for them.