It's either the switch or the motor, about all it can be. You might try popping the switch out of the door and making sure the connection is not corroded, but other than that not much else it could be.
got the door basically apart and the interior removal stuff scares the hell out of me, so we will see...check the switch, removed checked, reinstall, nothing SO..buddy is coming over tomorrow and see what we can figure out.
Mine roll down. Then when I try to use the auto roll up, nothing happens. If I slightly lift on the button (instead of full motion for auto roll up) then the window will come up. Once the window is up an inch or two, then the auto roll up will work. I think this is a known issue on earlier Titans and this Service Bulletin fixes it. I haven't done it yet, just waiting.