Just to understand:
Pass side window never worked, even when commanded by the drivers side switch.
You replaced the switch, twice, and the window will still not return to the "up" position.
The back-lighting for the replacement switch(es) would not illuminate when plugged into the door-subharness.
Obviously, somewhere along the line, you're not getting power. First confirm power at the switch itself, and if the fuse is in-tact. I've seen wires break at the door junction into the cabin. If you don't have power at the door, you need to follow the sub-harness into the cab, and find where your break is.
In the meantime, you can use two test lights to supply the window motor with power. A quick google search reveals the motor works off 12 volts, so you can use the battery or a jump pack to power the motor up, assuming the motor itself is also good. I wouldn't just jam the leads in, and take it all the way up. Ease it up slowly, completing the power circuit only briefly.
Or, just pull the door panel, and yank that bitch up.