1999 chev cavalier horn blares all the time. started out honking now & then when turning steering wheel a certain way or hitting a bump. had to pull fuse to stop.

Possibly an errant theft alarm??

Seems like a steering wheel issue, slip ring contact

Security engaged, Lock and unlock doors with key until horn stops.

the reason it is doing that is either the pad on the steering wheel is shorting as if you are pressing on it, or the clockspring under the steering wheel is shorting to ground. there is a horn relay in your fusebox inside the cabin; you could disable it there by pulling out the relay. don't pull the fuse because it carries other circuits as well. I couldn't find the exact relay position, but just feel them with your finger while someone honks the horn; the one that's clicking with the horn activation is the one to pull out. I can get you the layout of the fusebox but you really don't need it for that.

I would get a horn button (Like they used years ago) and mount it to the dash. You will have to find the ground wire that comes from the steering column though.

Just take out the horn fuse. Your Horn Pad is bad.

hey, im not sure what your car is like but if you do not have an airbag steering wheel then you can just pull the horn pad straight off and replace it... see if that works but remember its illegal to not have a horn technicaly so its best to fix it quick

ok its one of 2 things

1- behind the steering wheel between the column,there is a part called the sir coil,it allows the steering to turn with out getting the wires inside tangled,,this SIR COIL could be bad and making contact when it should not and causing the horn to sound,,,,you would have to remove the steering wheel to remove this part and its easy to mess this up,i would rec a repair shop to fix this,

2-inside the steering wheel is the air bad,which also contains the horn buttons inside,sometimes the air bag swells up and gets hard and applies pressure on the horn buttons inside and cause it to soulnd the horn,,if thats the case you will need a new air bag,,,i would also rc a repair shop for this as messing with the air bag system you can set the air bags off just with static electricity,,,,
but one of those should be your issue i think,,,there is really not way to test those parts unless your a dealer,so i cant tell you horn to test it,you need the special load tools and stuff,,,
Take care

well i had a similiar problem. Until the problem is fixed, see if u have a fuse for JUST the horn, sometimes horn and cruise same fuse.. Pull fuse and horn will not honk no mo! (this is what happened to me, i punched steering wheel and it locked the horn button down) did u do something similiar? or maybe the horn button just got stuck!??!!?!?! try fuse thing first tho

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.