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Some horns, more specifically the older ones, have an adjustment screw which allows you to change the tone. It is usually a screw with a lock nut and very little adjustment makes a sonsiderabledifference to the sound. The location of the horn and the type and tightness of the brackets make a difference to the sound as well. Try taking a lead straight from the battery to the horn and see if the sound improves, if it does, replace the horn relay. If nothing helps you will have to replace the horn, but be careful, some after sales horns could sound worse than the original supplied equipment.
all the horns on every car are located at the nose of the car usually behind the bumper plastic covers.find it and have some one push the horn button as you use a test light to see if you have power if power is there then check for ground if both good horn is bad if not than check the horn fuse if its good suspect the clock spring under the steering wheel .
Generally, the PCM (computer) is located under the passenger-side floor slope, under a metal frame. You may want to remove the passenger-side kick plate plastic and peel back some of the carpet to revel it.
Locate the horn under the hood, probably near the front of the vehicle near the headlights. Tap with a hammer or wratchet. If this does not work, disconnect the wire that is attached to the horn itself and then replace the horn before your next State inspection.