I have a 2001 4-door Grand Am GT and the passenger side window wont go down. The last time I rolled down the window was probably 4 months ago and it was fine. I didn't notice any signs of struggle last time it was used, it always went up and down fine. The other windows go up and down fine. The passenger side power window does not respond from the drivers side master switch nor from the switch located on the passenger door itself. The power door lock on the passenger side works fine.I don't hear the window motor engaged either when the switch it pressed. What could the problem be?