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I would start by replacing the FOB. Sounds to like the electronics inside it are bad. The only reason the horns would go off is if you hit the panic button. There is a slight chance the receiver is bad. But Fobs are cheaper to replace than the receivers. If you have two FOBs and they both react the same, then replace the receiver. Or just ditch the system. The keys (in the door locks) should still activate the alarm system.
The button or wire is shorted in the column. Horn relays turn on with a ground signal from the button, so the wire only has to come loose or the wire get chaffed to cause the horn to blow.
My 4Runner did the same thing. What I did was just put a new battery in hook it up and let it honk. Put the key in the ignition and start it and it should stop. It is in alarm mode.
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