Spaznaut he is talking about rear window on a Sport Trac, which is different than doors.
The brain of this window is located on the motor, there are posts on how to reprogram this unit. If it will not work after reprogramming you will need a new motor. Also the switch on dash could be problematic, this window is not an easy fix and expensive.
I wired my rear window motor directly, with a different switch (normal window rocker switch) and it's been working fine for 4 years.
I suggest you remove motor and lifting mechanism and block rear window in up position from inside window compartment, this will make ST water tight.
Then inspect motor, lifting mechanism at your leisure find the problem and decide what to do.