More frequently, the horn itself is the defective component.  If you've got
a test light, unplug the horn and probe the connector with your light.
Have an assistant push the horn pad while you're probing the connector.
If the lamp lights, it's the horn itself.

I'd tell you how to remove the horn pad, but since we don't have any
non-airbag models in the U.S., I don't even know what the pad looks like.
Have a look around the steering wheel and see if you can locate any screws
or bolts that  may hold it in place from the rear.

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