power window not working

I have 95 pontiac transport and the passenger side window will go up but not down. I have replaced the whole apparatice that moves the window and have also replaced the motor with three new ones. Also I have replaced the switch. I am getting power from the switch to the plug where it connects to the motor itself, but still window will only go up, not down. Is there a relay somewhere that I could check?

PLEASE HELP!!!

THe switch for the passenger window takes ground through the driver switch. So your problem is probably the driver switch, or the wiring between both switches. COntacts B and F on disconnected wiring at passenger switch should read a solid path to ground.

www.avigex.ca/xport/pwrwindows2.jpg

I just fixed the exact same problem. My 95 pass window would go up, but not down. Turns out the metal guide inside the door that holds the left side of the glass in place had a worn out rivet. The window would slide ok going one direction, but when i reversed the window, the guide would shift and the window would jam. Maybe this is whats happeing to yours....