Wierd Horn Problem

Yesterday the horn in my 1998 Saturn SL2 started to sound in the middle of the night. My vehical has a remote control horn locator on it which I think may be part of the problem, however because I don't really know the wiring of it I can't fix it, if that was the problem, which I am not even sure it is. I had to pull the fuse to the horn to make it stop. It was also very cold yesterday, which may have had something to do with it as well. If anyone has had a similar problem or know the best way to solve it please respond.

how good are you at wiring? do you have a multimeter?