what causes it is the real thin plastic that holds the bar on the elevator. Its easier to go to a junk yard to get a replacement since they will try to sell you the full set at any parts store. The car is not that knew so it shouldn't be that expensive.
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.
If the driver side rear window of your 1991 Infiniti Q45 keeps falling down, the issue may be related to a faulty window regulator or worn window tracks. Start by removing the door panel to inspect the regulator for damage or misalignment. Lubricate the window tracks and check for any broken clips or components that may need replacement. If the regulator is damaged, consider replacing it to restore proper window function.
The engine is not running!
The switch is bad.
It's the switch because the motor is getting power to go up but not down.
yuan dynasty
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.