It is buried up under the right front fender. I am going to replace mine as it is not sounding very loud. You can get at the feed wire easy enough. So I will mount the new horn in a more accessable location
Your horn is in back of the radiator grill (Grill in front of the car)
Have your Mazda dealer parts department print out a picture of the relays location for you. They will do this if you ask them.
Open hood and disconnect the wire from the horn itself located under right front fender.
in the stearing wheel
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.
behind the plastic grill on the front.
The horn fuse is the same as the stop lamp fuse
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.
horns are usually located near the grill area in front of the car.
if your horn wont go off its a short to power or faulty conector