I have a 1999 E36 M3 convertible with driver window problems. The drives door was slightly out of alignment, so I tried to realign the door in my garage. I got the door realigned but the window stopped going up or down. It is currently stuck in the up position and does not move the typical half an inch when the door is opened or closed for the convertible top. I figured I must have put the window in some type of bind when attempting to realign the door. Yesterday, I took the car to a local body shop to have the door aligned properly. Unfortunately, they could not get the door to align due to window not lowering the typical half an inch when the door opens or closes. They said the window regular was bad, but I am sure they did not take the door panel off to investigate. I don't mind tackling the window regulator project, but I want to make sure the regulator is actually bad. When I press the window up/down button I can hear the motor click, so I feel confident the motor has power. At this point, I am not sure how to distinguish between a bad window regulator, motor or some type of relay. Any advice on how to distinguish between the three would be greatly appreciated.