Does the motor receive power? Check the switch.
No power to the switch and check the fuse. Diagnose the source.
Power to the motor. Checked the motor, check the ground to the motor.
There are some plastic pieces in the mechanism that often break and jam the window. Mercedes source in Bellevue Washington used to carry these.
When it is repaired be sure that all the friction surfaces are lubricared. I spray silicon spray around the door frame where the window goes up and down to help reduce the drag in those areas. Make sure the rubber scrapers on the outside of the window or in good condition so water does not leak into the door. Also check the door drains. Clean out any rust in the bottom of the door and spray it with a good anti-rust paint or other solution.
video on the slides.