My window automatically rolls up when I close the door. How can I stop it from doing so? The down/up lock button doesn’t seem to be working.

 

Try doing a window relearn. Just search for 350z window relearn on Youtube. Tons of videos.

 

If none of the switches on the door work, then it might be the entire switch assembly or something with the wiring/connections. I'm not sure if you can do the relearn procedure if none of those buttons work. Best to get a multimeter and check for continuity to pinpoint the issue.