Either you have a main fuse blown or a main relay not working. Have you checked the alternator
SOURCE: horn not working!
check with dealer there was a recall on horn button spring not making contact rec insp that first.
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: 2005 pontaic sunfire horn not working. fuse is
Under your hood there is a box that looks like a fuse box. It contains relays. Replace the one marked horn.
SOURCE: My turn signals/ cruise control/wind
I wonder if one of the vehicle computers has failed they sometimes run almost everything you described I would take it to a dealer and get your computer scanned for error codes
If Yes, you will need a 15 Amp, (blue), blade fuse to go into position number 14. There will be a diagram somewhere on the lid of the fuse box, (inside or on top), showing where this is.
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