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
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I tried the reset but that was not the problem. I removed and disassembled the window switch and found a silicon/rubber piece was bad and the switch would not "rock" back and forth properly. I swapped out the rubber with the rear window switch and it worked properly. I doubt I could find the switch internal parts so I ordered a new switch.