Chevrolet Luv Electric Circuit 1994

Hello, I would like to know if someone has the electrical circuit plane of the Chevrolet Luv year 1994 Motor 2.3 Gasoline. I have a fairly rare fault, since the horn fuse is skipped without action and according to the fuse box feeds, only, this function. When I change the horn touches and then travel for some time stops working. Every contribution will be appreciated.