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if all else fails get an air horn and blow it at the same time the horn gets pressed to make the inspector think it works. ;)
Try popping the hood on your car and look for the horn. They should be up near the front by the radiator or headlights then take the connections off and replace them securely. If no luck there replace the fuse, the fuses dont always look blown when they stop functioning. After that take the horns out of your car (usually just a screw to dismount the bracket holding the two horns to the panel.) and manually hook power up to them by touching wires to the ports and then power on the wire. (i know that we allways make sure there isnt power to the wire before we need there to be there because its just not safe...right?) At this point you should know your problem. If not than you need to test your power leading into your horn.
Check the wires on the horn. Wiggle them while someone activates the horn button. Next connect a hot wire from the battery directly to the horn. If there is no change the problem is probably a bad horn.
Fuse box is under the dash to the left of the brake pedal and has a black door on it. If the fuse is ok you might have to unbolt the airbag ( 4 bolts on the back of stering wheel)and check to see if the horn plug is plugged into the steering column.This plug has a spring on the end of it, if its out reinstall in the small hole and turn clockwise til it locks in place.
Check fuse for horn and for dash lights. If the interior lights work then suspect dimmer switch for the dash lights. If you press the horn button do you hear a click under the hood or inside the car? If you do not then the fuse is blown and if the fuse is good then the relay may be suspected bad. If the fuse is good and the relay clicks then suspect the horn to be bad. If fuse is blown and you put a new one in and you push the horn and the fuse blows again, then disconnect the horn before replacing the fuse again. Then push the horn button and see if you hear the relay click if you hear a click the the horn is bad or wiring butmost likely the horn. If you have the horn unplugged and the fuse is good and you push thee horn button and no relay click suspect the horn button to be bad. Hope this helps.
most likely cause is a defective horn. to diag. problem you will need a test light or volt meter and check for power or 12 volts or more while someone is pushing on horn pad.if power is there horn is bad. if not more dia is required. let me know.
ok the only thing i will sujest or actually there is two things,
you can either locate the horn circuit under the steering column and run a wire to have and external aftermarket push button swtch intalled or take the car to any auto repair they should be hable to fix, ask for an estimate, just tell them if not fix you won't pay, and if you want to locate the cable most of times it is black in color and must to be a thing wire like 16 gage wire, all waht you have to do is make sure the fuse for the horn is good and then get a little light tester, it is a little tool than looks like screw driver but has a bulb inside, and one end is very sharp and the other has a cable with a you have to atach the cable end to a good ground, and just keep testing each wire with the sharp end,
and when you hear the horn then atach a cable to that wire and the another wire to a good groud and the conect it to the universal push bottom swtch, and locate the switch at some plce you wold like to and that's it, good luck and let me know