First be certain that the circuit breaker for the power windows is not faulty and that it does have power to, and going through the 30 amp circuit breaker in the fuse block under the instrument panel.
If there is power from the circuit breaker then there is most likely a broken wire at or inside of a weather boot that runs between the door and the body of the vehicle. It will most likely be on the driver door weather boot, or it will be inside of the weather boot on the door that is having a problem with the window.
A power probe would be the best way to diagnose the power window circuit, and applying voltage to the suspected window motor directly through the wires from the window switch for that motor would determine quickly if the window motor itself is faulty, and here is a wiring diagram to help assist you.
Let me know if you require any further assistance.
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