ive had a bit of a night mare with mine as u can see from this thread...
http://www.e90post.com/forums/showthread.php?t=470971
no idea why my side bolsters have stopped working when i fitted the heated sports interior??
also is the harness that comes up from under the seat different on heated cars and those that are not? in that case will those two harnesess (one for drivers and one for passengers) need to be replaced too?