the window regulater has a nylon tape that runs the window up and down. the tape can be purchased fromm the parts store
The window will often fall down on a 2001 Nissan Xterra due to a faulty drive motor. This causes the tension that holds the window in place to release.
It's the motor assembly that causes the door to go up and down.
you could possibly have some sort of shortage
Drivers side rear of engine down by the steering column. Wires to a gear.
The engine is not running!
yuan dynasty
The switch is bad.
It's the switch because the motor is getting power to go up but not down.
Your problem isn't specific. Here is a list of causes. please refer this to identify the problem - http://carcarehow.blogspot.com/2011/10/window-does-not-roll-up.html
There could be two causes for this problem. The first being the fuse to that window has blown and the other is window motor is getting weak.
The controls and rails have worn and the vibration of the vehicle is allowing the weight of the window to move everything down. You may need to remove the door panel to replace some of the internal parts and the window rails.