yeah- mine got stuck, one of the window 'clips' fell off into tailgate.
This allowed the mech to overshoot the safety switch and thus disabled the motor. Pain to sort out . But dirtwags advice is good too- on another occation my window wouldnt raise- all because the tailgate was very slightly open on the side with cutout switch. Took a while to figure out but after opeing door and buping that side back it worked fine. Once your in there its worth cleaning all the old yellow grease off, and re-greasing the whole mech and cable tying the loose cables out the way .The mech can chop them up (like my heated window cable). I also removed handfulls of pine needles and rust that built up and sprayed the lower seam with litium grease to stop rust.