thats a shitty motor....
bowser, next time you have one off can you look for a couple of sensors and take a pic for me. they are about 7mm cubed black and are somewhere on the frame/hinge around the motor housing. if you follow one of the sets of wires that is unplugged it will lead you to them.
item number 36
http://www.realoem.com/bmw/showparts.do?model=BT52&mospid=47797&btnr=54_0311&hg=54&fg=10