Mine was gone and badly rotted away on the passenger side. There is stiff foam insulation up in there. no access to the carpet. I had the body shop rehab the rust and they welded a plate over the opening.. If my sunroof drains aren['t draining i'd hope i;d notice my carpet wet inside ,no? What are there plugs there for anyway if the cavity above is filled with heavy sound damping foam insulation? Pulling the plug out isn't going to drain anything .Ws it just an opening to blow foam in?
1995 540i Manual build 1/95