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Fuse # 15 control power to the horn relay, remove the fuse and see if it stops blowing, that is one test, secondly remove the relay to see if this disable it. You could also have a horn button that is stuck in the engage position.
You will need to replace that "stop horn" fuse since it also feeds power to the stop lamps and the gear shifter solenoid, when you step on the brake pedal. Your best bet is to unplug the horn on the vehicle(to stop it from honking) until you can get it fixed. That way, you will be able to shift out of park to get it to a shop for repairs.
Hi, If the horn only honked once it may be a symptom of your car alarm being set off after power has been re-applied. If the horn stays on after you reconnect the battery you have either a stuck horn button on your steering wheel or a stuck horn relay. Or it could be the alarm sounding the horn but that usually that occurs in a series of horn blasts (rather than continuous) and the car indicators usually flash in sync with the alarm sounding. If the horn is stuck on in a continuous blast ie not sounding on and then off and then on etc etc, disconnect one the battery cables then pull the fuse that feeds the horn or pull off one of the removable spade electrical connectors from one of the 2 terminals on the horn itself. Usually the fuse box is either under the dashboard on the drivers side or could be under the hood. Consult your user manual for your car for fuse and horn locations. If the horn is stuck you need to visit a qualified auto electrician, or perhaps you have a friend who knows his way around auto electrics? Cheers, Steve (Melbourne, Australia)
sounds like a electrical problem. When you turn it is completing the circuit some how, sounds like wires are touching each other and making the horn honk when turning. easiest thing is remove the fuse if possible.
Definitely a short to ground somewhere. You can start unplugging some fuses to see which circuit is at fault. When you get to the right fuse, your issues should cease, but now you will need a schematic for the wiring to see what that fuse supplies. Then you will need to go to every device that is now not working since you unplugged the fuse and disarm them one at a time and replace that fuse and see if the symptoms still exists. If the problem with the horn goes away, you have two choices...if the device isn't that important, leave it disarmed, or if it is important...replace that part or look for a bad connector or both and you should be back into business. When you have a short to ground sometimes it is on the hot side of the fuse box which take a toll on the battery.
obviously there is a short in the system probably in the wiring and likely it is exposed wiring. Motion,moisture, and heat would then effect the wiring and cause it too short out at different times and for varied lengths of times. driving your car would cause it to get hot under the hood, so after awhile the wiring shorts and your horn honks. Turning on and off the system causes motion and if it is stuck in a particular position when it shorts than the horn continues to honk