2002 Cavalier rear defrost problems

I have a 2002 cavalier that the rear defrost has suddenly stopped working. The light comes on inside the car to indicate that it is on but it does not appear to work. I have checked the fuse and it was not blown. Any help with this is needed.....Thanks

check the connections at the back winodw to make sure they are plugged in all the way and dont have corrosion on them
if u have a volt meter check for power at them also
u will only get power to one side
the other side is ground
not sure which is which tho