How do you locate and fix the horn relay on a Mazda Protege 1992?

To locate the horn relay on a 1992 Mazda Protege, check the fuse box under the dashboard on the driver's side. The relay is usually labeled, so refer to the diagram on the fuse box cover for identification. If the horn isn't working, test the relay by swapping it with a similar relay in the box, or use a multimeter to check for continuity. If the relay is faulty, replace it with a new one.