Hi,i have a problem with the passenger window on my 318is coupe,sometimes when driving the window jumps up and down about quarter inch seems to do it more when conering to right, Today window would not shut when closed the door then it started chattering,i took door panel of for inspection and could`nt find any problem with wiring or connectors,a freind told me this could be caused through a faulty micro switch in the door handle could this be true or could there be a problem else where,any info would be greatfuly appreciated.