I haven't read all of the posts above, but I thought I'd share my experience: the window motor stopped working too. First it was half working, then completely stopped putting the window down. Went to Nissan who stated I require the whole motor to be completely replaced. They quoted over $1k for the job.
After speaking to an electrician, I was informed that the motor inside just likely needs a bit of cleaning. There are plenty of instructions that can be found online on how to get to the motor. When you disassembly the motor, you may realise that it consists of moving parts that just get worn out and need cleaning for better contact (research a little about how a motor operates if in doubt). After a good clean of the coils etc, it works great so far.