Disconnect the horn, test with multimeter (set on AC and the range that within 12 volt) some body must just press the horn inside and the car must be turned on. if you get a reading on meter the horn is OUT, you can clean and adjust it on the horn (first tap the horn to make sure there isn't any dirt in it) there must be a screw with a lock-nut, release the lock-nut and while somebody is pressing the horn inside adjust that screw until it make a sound adjust until you are happy and lock the lock-nut again
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