power locks and fuel door
 

My car for some reason is having troubles with the power locks and the fuel door,
meaning that it won't open . Some times the horn won't work and the doors won't lock.
Just recently the fuel button on the drivers door doesn't work and will not alow me to
open the fuel door. If it is not a fuse what other problems do i have to expect, and
could it be the wiring harnes and that there might be a short or frayed wire? Any
help would be greatly appreciated.