well, I think I should head back to work.. 3 hr lunch break and all. I would start at the up and down wires and see if they are outputing when you hit the switch, if they aren't, which is probably the case, then you don't have 12v in.. could be a broken wire, usually in the door boot, or a broken breaker in the fuse box. It will look like a big fuse made out of metal, kinda. look in your owners manual to see where these are located.. I think they are usually 30 amp.
When I get back from work I'll check the thread.. let me know any updates and I'll see what else I can come up with if it still isn't working.