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You may have wires that have become crossed. The wire to the horn and a hot wire have probably lost the outer insulation and crossed each other causing the horn to start honking when it is connected. Check the wires with an electrical tester.
the negative wire or negatice current is shorting somewhere near the horn when you put key in the ignition and swtich the key fodward the battery current starts flowing in the wires and at due to short cercuit in or around the horn it starts honking so check the connections around the horn unit and secondly the problem can be in the horn button . Due to dislocation of horn assembly inside the steering wheel it happens sometimes
First thing check that it is not a blown fuse. Next unplug the horn wire and make sure the horn works by applying battery voltage to it, run a wire from the possitive post of your battery to the terminal that wire was connected to. If it works I would then check that the wire going to it is not damaged. If all looks good then it may be in the horn button itself...this maybe harder to get to and probably not within your ability...
If you have a remote, lock then unlock the doors using the remote. That should stop the horn. If that doesn't work, use the ignition key in the driver's door lock and turn the key all the way to the left, then all the way to the right. Of course, this all has to be done with the battery connected, and the horn honking the whole time. If none of this works, look for a reset button under the driver side dash, or it may be a toggle switch. With the key in the on position. push and hold the button until you hear a beep from the alarm. On some cars, the reset button is behind the driver side kick panel.
If you have your owner's manual, there is a section that will tell you the exact sequence to press to enable/disable the horn bonk. It has three settings, chirp, honk, and off. The chirp is a really quick chirp of the horn. Honk is a longer honk. Off seems to be what you've set.