Wiring for the rear window runs might be incorporated with the wiring for the taillights/stop lights/back up lights (if equipped) on the driver's side. If not incorporated with the rest of the wiring, it will be a separate harness. In either case the plug to connect the wiring to the underdash harness will be behind the driver's kick panel. Once you locate the rear window harness, one of the two heavy duty wires (probably 12 gauge) makes the window go up; the other wire down. If the motor doesn't work, you only other option is remove the tailgate access panel from inside the car. I'm guessing if you drop the motor, the glass ought to lower at least partway until it can be disengaged from the motor arms. Hope this helps a little.
