My horn goes off randomly in the middle of the night like someone is holding it , the cops came and unplugged battery , but when in was screwing battery back on when i put screw by battery random honks were happening and as i was screwing it on alarm went on then i started car and whole car lost power then i screwed more and got it started

Could be a motion sensor is going bad (sensors that detect someone breaking in). See if you dealer can verify they are OK.

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.

my 97 eclipse did same thing so I had to remove horn relay which is temp.solution but completely immobolizes horn usage.

You could also just unplug the horn, should only have one or two wires going to it. Then you could still drive the vehicle without that damn embarrassing horn randomly blowing. Hard to say , not knowing! ;-) I hope this helps.

Is the alarm causing the horn to honk? If so, you need to figure out what is causing the alarm to trigger, which could be any number of things.
Or, the panic module could be failing.
It is least likely to be the horn ring unless the only way you can get the horn to stop is by "beating the horn button on the steering wheel".

If it is, then you can replace the parts for the horn button, but you will need to get an assembly manual for the vehicle. Be sure to disconnect the battery before attempting to remove the airbag module. If it goes off, then you risk injury, and, they are not cheap to replace.

was it hot outside-heat could deform the steering wheel horn pad and make the horn go off,remove the horn pad and airbag unit(take fuse out for airbag system wait a few mins)then put the fuse that you removed back in place and see if the horn goes off again.

y horn on my Seabring would go off all by it's self. The dealership told me it was because we did not have a key fob to turn the security system off. We paid $120 to get the fob and have it programmed. The horn did not work except on the panic function of the key fob. I checked the fuse and relay and both were working. I was not getting voltage to the wire on the horn. I had the dealership look it over and they said I needed a new airbag for $600 plus labor. The problem was not in the airbag. The horn pad had a short in it caused by the tabs on the back of the Chrysler emblem that is located on the steering wheel cover. The prongs had made a hole through the horn pad. The horn pad is the switch that connects when you press the horn. To describe it imagine two pieces of copper foil much like aluminium foil. There is a microsopic thin layer of pourus plastic like membrane on each piece of foil. When you press the horn the foil makes contact.
THE FIX:
The tech had removed the airbag from the wheel. I did not have to pull that. Here is how to pull the air bag. There are two screws that hold the cruise controls on the steering whell. The are located on the back of the wheel. When those are removed you can remove the screws that hold the airbag. You will see them. I don't know what size of torx bits you need. Pull the bag our and disconnect all the wires. It will not blow up. Use a 10mm socket or wrench to remove four lock nuts. You will have to pry the metal cover off of the airbag cover. Be sure to bend the prongs back in for replacement. Now, Use a pair of side cutters or your choice tool to cut the holders that retain the horn pad. Pull the horn pad and cut the indented spots out. I used a single edged razor blade. Once the holes were made I used a pocket screw driver to open upt the horn pad. Don't damage the two foils. When you get an opening large enough to grab pull the two foils apart and use electricle tape to insulate the two inner sides of the foil where you made the cuts. Now put it back together. It took me a little over an hour. No shop will asume the responsibility to tamper with the airbag so you are on your own unless you want to pay me. I am an ASE Master Technician. Don't pay the $600 the shops want. It's already broken. What can it hurt?

This is probably a temp thing...night brings colder temps. The wiring may be failing or the steering wheel portion over the horn might harden and cause it to touch the center of the horn to make it go off.
Let me know if this helps.

horn switch defective. Replace it or adjust it to fix your problem.

You can unplug the horns under the hood but the relay will still be on draining your battery....the horn pad is warped and when it sits in the sun it will flex and make contact so you need to take the pad off (2 screws behind the wheel) disconnect the single wire from the pad and tape the end up