oh one more thing whenever you have a problem check the site below ad bookmark it first before you post or ask a question and if you need further help just provide what you know and what you want to know hope this helps
240sx Tech - 240sx Performance, Modification and Repair Articles in One Place - Copyright NICOclub.com

well i don't know much but from the looks of it the motor is fine

t its just the power needed to bring the window up that isnt there, therfore it would be amp

and dude check this out i googled 240sx window amp.......and then it suggested "window amp repair" i clicked it and lookie here

Repairing Power Window Amp: 240sx Articles: Nissan Forums / Infiniti Forums - NICOclub

Thanks. I'm going to push the window up for now. So you are saying it can be both the motor or the amp? If this helps, it stopped working so I took the switch apart because I thought it was dirty. Once back together it worked for about a day again but later it stopped wiling again.

hey i saw ur thread look through one of my posts about your window problem its just a temp fix
basically unscrew your door panel off, peel off plastic film, and manually push up the window. if you need more room then pull the window out u can find more under my posts hope this helps might need a new amp/motor Good luck