Rear defrost problem

The problem is the rear defrost on my 03 crown victoria police interceptor comes on and wont turn off. I noticed it when i changed to a new battery and the next day the car battery was dead. If i would hit any bumps on the road the button light would flicker and after a while it just stayed on. I got the car in may so i didnt need to use it so i took the fuse out. Fall is right around the corner and i need to get this fixed. Please Help

Have you tried another switch or the relay? It should be a fairly simple fix.

I switched some of the relays around and put a fuse back in and it works fine for now lol. thanks for the reply.