did your ( 350z / g35 / altima / titan / insert other nissan here ) window motor stop working? the common solution on the forums / facebook groups is to throw away the old one and buy a new one for around $150.
you can take the motor apart and clean it and it will start working like new again!
it seems from the factory the window motors were over greased, when the window moves in one direction it flings grease up into the electric motor gumming it up and causing it fail. here is a picture of mine after removing it.
i used rubbing alcohol, paper towel, q-tips, a razor blade and some sand paper to clean up the electrical contacts, here is the after
it has been working for 5 months now without issue! best part is saving $150
there are some youtube videos out there that also show the cleaning with some more detail. (not my video)