on a google search 3 months ago, there was a detailed procedure from a father and son... with pics!!!! u should try to find it,, anyway, if u don't find it, then u should do the following: don't think too much, just open up the comfort relay and resolder the cold solder joint, and then 5 minutes later BAM!!!!!! AMAZING!!!!, ur power windows and sunroof will work... don't ask me why bmw put so many damn switches for this circuit....anyway,,, good luck.......