Check the fuse it is good
There is also a horn relay. Generally under the hood, on one fender well or next to radiator, in a black box with a snap on lid, with a bunch of other relays. They don't often go bad, but it happens. Varmints also nest under hoods and chew wires, sometimes. I've only had one horn go bad, in a lot of years, miles, and vehicles, so I'd bet on the relay or a bad connection (or chewed wire), given the age of your truck.
SOURCE: Brake lights
Check your emergency flasher switch... if it located on the column it could have been "hit" and is inbetween the on and off location, this will cause the turn signals and break lights to malfunction
SOURCE: volvo S60 2005 horns not working
Remove the wire connector from each horn and attach a voltmeter or test light. Have a helper push the horn button while you check for voltage. If there's no power getting to the horns you have to work your way back to the relay checking for shorts. If there is power try holding the horns metal mount against a good ground like an engine bolt or the sub frame. And with wire reconnected have your helper try the horn again. If it sounds then clean rust away from mounting bolt and car (rad support or grill bracket), and look for a loose or broken ground strap to the rad support (from either the battery or engine). If both horns still don't work either they're clogged with snow or dirt (bring them inside to defrost or clean out), or they need to be replaced.
SOURCE: can't find fuse box for horn,turning signal and windshield wiper
I looked this up on WikiAnswers. Apparently the 2005 dodge magnum has 2 fuse boxes. One is under the hood on the passenger side and the other is in the trunk, next to the battery, in the spare tire storage well.
SOURCE: 2005 ford taurus horn just doesn't work. I've
The problem can be with the horn pad, the horn relay or the horn itself. Find your horn relay, it should be in the engine compartment fuse box. Remove the relay and test for power at the legs. there should be two legs that have power. If there is power there, take the cover off the relay and plug it back in. Squeez the relay points together and see if the horn works. If the horn still does not work, it is probably the horn itself. If it does work it is probably the horn pad, but you don't want to mess with that because of the air bag. Let a pro do it.
All of this is predicated on the fact that you have checked all the fuses.
Hope this helps
Rich
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SOURCE: 2002 Dodge Caravan horn doesn't work. Fuses are good.
2002 dodge grand caravan horn problems
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