[chevyguyase]

I'm reading the posts and don't see where you've replaced the master switch. If that's so, go to your master switch. find the dark green wire and the purple wire. apply +12v to one and ground to the other. The driver's side rear window should go up or down if the rest of the circuitry is good. now reverse the jumper wires and the window should go the opposite way, up or down. You obviously have B+ and ground to the switch if the other windows work from the master switch. If you can control the window through those two wires from the master switch it almost has to be a bad master switch. Which is usually the culprit,(most used) that and the wiring going from the door to the body on the drivers side(most used). Hope this helps.