It is important to know where the parts are within a car. The horn relay in a 1993 Mazda Protege is found in the cars fuse box.
I have a 1993 Mazda Protege LX and I was told that there is no relay for the horn, there is a horn switch inside your steering wheel. that might help
Have your Mazda dealer parts department print out a picture of the relays location for you. They will do this if you ask them.
in the stearing wheel
behind the plastic grill on the front.
The horn fuse is the same as the stop lamp fuse
Your horn is in back of the radiator grill (Grill in front of the car)
The horn for the 1990 Mazda Protege is located near the right turn signal at the front of the car. To the left of the radiator when your looking at the engine with the hood up.
The fuse for the horn should be on the drivers side underneath the dash. There is a diagram on it that shows the horn fuse.
It is in front of the radiator and the horn itself can be bad.
The 1990 Mazda 323 horn relay switch can be found on the front drivers side quarter panel. The relay switch will be on the inside of the quarter panel.
The horn relay on the 1993 GMC Sierra is located on the fuse box. The horn relay is a rectangular shaped plug next to two larger round plugs.
Open hood and disconnect the wire from the horn itself located under right front fender.