I have a 2003 E46 M3-I lowered the drivers power window down and it will not come up. The passenger window works. I pulled the door panel and also the motor. The motor works, but only spins one direction. I checked polarity (only two wires to the motor) and the polarity does not change when pushing the switch to the up or down positions. Is it the switch or is there a relay? Cant find much on this on Youtube. Kirk 612-751-0678