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Your security system is being activated is my guess. have the dealer scan the system with a Tech 2 and see if the drivers door anti tamper switch is the problem.
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try disconnecting the battery neg lead and the pos lead then join them together for 5 mins then reconnect the battery and see what happens ,it might just reset the fault for you .
Horns have constant power all the time so when you press the horn button, all you are doing is grounding the circuit and that makes the horn blow. Usually what happens is that a spring breaks underneath where the horn button is or something allows the horn button to ground out somewhere, possibly even through the inside of the steering column.
I think your horn relay is making contact from behind your horn buttons on your steering wheel. Usually as time creeps up the insulation that is placed on the positive lead for the horn gets worn out from constant horn action. If it is worn down the horn is touching a ground and completing the circuit and thus making the horn sound. I would start with that first before getting more technical. Let me know. Gabe
Very possibly the horn relay. This is located in the left junction block ( fuse panel) on the left side of dash. Open driver door and you will see a panel cover on the end of dash. On the cover it should list the position of the relay which I believe is on the right of fuse panel. If you try the horn and it sticks on again, try tapping the relay, if stops then that is the problem.
Same problem on 98 Jetta at about 9 yrs of age. Wiring harness was an expensive job. Dealer replaced all wires going to doors so that alarm isn't mistakenly triggered by opening doors. Dealer offered to remove alarm for a few hundred dollars, but couldn't assure us that the key fob would still open the door locks. Who wants to give up power locks? My hunch is that wire in driver's door breaks with flexing over 9 years. Could consider replacing short stretches of wire in hinge of drivers door if you're handy with a soldering iron.
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