Do the passenger side windows work? Not sure if the "window lock" button on the drivers armrest will allow the windows to go up only. But if that is the case the passenger side should work the same. Possibly a bad switch on the rear door or a bad connection. I had an issue with the rear drivers side window on my Forester that would go down and not up. But it wouldn't go up from the drivers control either. Turned out it was a loose connector in the drivers door.