I had a similar problem on my 2013 Jazz. Rear windows never opened because nobody sat in the back. When the car was about 2 years old I had reason to open the rear offside window, completely dead, switch did nothing. . So I tried helping it while pressing the switch and it moved and then opened- it was stuck in the guides and to the top seal because it hadn't been opened since new , after that it worked perfectly.
Just a thought in case you're looking for a problem that isn't there.