The connections to the window are enclosed in a black hose near the top of the door which then goes into the car's frame(it's about the size of a tennis racket handle). While the the offending window's door is open move this hose around with your hand while pressing the switch in the up position. Sometimes the wire shorts out here and just moving the hose around will get the window up. Two of my three w123's window problems were "solved" doing this.