I, myself own a 1993 Cadillac Sedan Deville. It has over 150K miles on the odometer and has over time had a myriad of parts replaced, mostly by me. One day, for reasons unknown, the window in the driver's side door decided not to work. Like you, all other windows remained fully operable in both directions. While the switches can fail they are, as a rule, quite reliable for long periods of time. When trying, for some time, to get the window to operate, without success, I thought, let me think about this. Upon reflection, I decided that although switch failure is possible the odds of both sets of contacts, raise and lower, failing simultaneously are small.
The next possibility is that the window regulator which is what the manufacturer calls the mechanism, has developed a motor problem. These are DC motors and I don't know whether they have a wound field ar a permanent magnet field. Assuming a wound field it is possible that the last time the window moved under power the motor stopped with a brush either stuck or in contact with a "dead spot" on the commutator. Assuming the latter and with the window fully up I opened the door, pressed the switch to lower the window and while holding the switch in the down position I simultaneously slammed the door. Voila!!! The window went down and became fully operable once more. It has been operating as designed ever since; about 8 months now. Give it a try. Window regulator assemblies are dear and the motor is NOT available as a separate part. Good Luck!!
on Dec 02, 2017