Our Mazda Familia 2001 Sedan's power windows don't work. The driver's window with the "auto" button is the only window in the car that now works. The passenger side and back windows don't work at all. I can't hear any noise at all when the switches are pressed. Does anybody know what the problem is please? 

I did splice into the left reversing lamp yesterday (coloured and black cables) to install power for a reversing camera. I'm wondering if that had anything to do with it?

One window is slightly down so will be a problem if it doesn't get fixed soon.

Thanks in advance!