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Make fused jumpers and test the window directly from battery power before you do anything. Search on my user name and all the words "test" "fuse" "window" and it should pull up what I posted.
I would suspect a switch first, the harness second, the window motor very last because the pass. side hardly gets used. The switch could also be defective on the DRIVERS DOOR and not passing power to the pass. side.
My dear departed wife had a 98 Windstar that the passenger side window quit in the up position. As well as I remember, it wasn't that hard to get to the inside. I checked voltage at the motor and to my surprise...the motor was bad. It's not very big either as well as I can remember.