Many things mate each window has a fuse to them thinking back it could be 7.5a follow the cable from the passanger side till you get to a fuse and check it if the passanger isnt working and the drivers is then their is something preventing signal/power to the passanger also check no cables have been cut.
I made a sticky when i fitted mine as they didnt come standard here it is:
http://www.saxperience.com/forum/sho...d.php?t=322591
Check it out it wont tell you how to fix it but will give you an insight into what you are looking the check
Let me know how you get on