Sometimes you can just pull the door panel and see inside well enough to see if there is a physical issue such as the window being off track and maybe even see the motor to see anything obviously wrong. It would be unusual for the window to get off track unless a bolt came out, but you could have a stripped gear in the motor. If you can isolate the motor plug, you can apply 12v to one side and ground the other to see if the motor runs. You may have to try reversing the wires too. If the motor isn't moving the window, it is probably a bad motor. With the one's I've seen, a bad switch usually is a work/doesn't work kind of issue. Unfortunately, replacing window motors can be a giant pain in the rear. Some are easy and some are crazy hard. You won't really know until you get into the door.
