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If it is the horn that keeps going off, pull the horn fuse, that should stop it till you figure the problem. The bcm can ground the control side of horn relay as well as the horn switch. I'm not saying the bcm is faulty, I don't know, at the moment.
What your hearing is the factory alarm not the horn. Connect the battery when the alarm sounds go to the drivers door lock with the key and lock and unlock the door until the alarm goes off . Then reinstall the fuse for the horn.,
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)
methinks a stray wire in aftermarket alarm system. Most horns are negative switched (ie they are operated by earthing a wire on the steering column) and would not interfere with positive-switched items such as the hazard lights. Does your car have an aftermarket alarm?
I've had this exact problem before when being jumped off. The fob DOES NOT make it stop. We removed the fuse that goes to the horn. As soon as your battery gets recharged from the alternator, the fob will work again and the alarm will quit sounding. The only pain about removing the fuse is that the cruise control will not work until you put it back.
If there is no original remote try to find a switch that may be hidden but accessible from the drivers seat, if the alarm is no longer needed find an auxilliary wire that may be on the battery or the fuse panel, if original there may be a fuse under the hood, pull the fuse and it should disable the alarn system.