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Many controls are activated by a vacuum line from the engine. My wild guess there is a slit or bad connection somewhere on the way to the control system. Good ears or "hearing horn" should help you find the sound source.
Make sure the A or D terminal is connected to the center rail. U terminal to the outer rail. First do this without the sound activation button. Horn should sound this way. Once this works correctly, add the sound button in on the center rail lead (A or D) If the sound activation button activates the horn, reverse the connections to the sound activation button.
This should solve your difficulties
The horn relay is accessible when you remove the glove box. It's to the right of the glove box, and has a large chime box with two relays to the side. The one towards the rear of the car (first one you see) is the horn relay. It's a little difficult to get out, but just plugs in. That large chime box is in the way somewhat, but with a little patience you can get the horn relay out. They're about 9 bucks.