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you have either a blown fuse or the factory wire harness isnt connected to horn first check fuse owners manual will have location and description of fuses if ok retrace your steps when you hooked horn to new alarm you disconnected wire at horn or you cut the wire to access horn wiring
hope this helps plz vote leave a comment if need more help reply
This could be as simple as a fuse. Under your left hand side dash there should be the fuse box but it may be on your left side or even in the glove box.
Once you locate the fuse box then look for horn in the diagram on the outer cover or under neither the inside of the outer cover. If you have no cover or diagram then just start pulling one fuse at a time and checking the wire inside to see if is burnt through. Replace any that are bad. The next step would be to take to lead wires long enough to reach from the battery to the horn under the hood. Put one lead on the positive side and one on the negative side and touch the other end of the wires to the connection ends of the horn. I bet you can't keep from jumping when it honks. If it does honk then the problem lies elsewhere. Let me know if this fixed the problem and if not I will delve into it further with you. The Raz
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.
I would first try pulling fuses to see if it is bad there. If not, you can try to run wires directly from the battery to the horn to see it it can honk. Disconnect it from the circuitry and then just touch the wires to the terminals.
Check the horn actuating contact at the centre of the steering wheel. It may be damaged or mis-aligned.
Also check the carbon contact that runs on the slip ring under the steering wheel (associated with steering wheel horn actuate switch) It may be damaged or mis-aligned.
If none of the above are faulty, you should look for a possible intermittent short to ground on the horn actuation control wiring.