The horn is not blowing on my 1999 aurora. fuse and relay switch work

It looks like the only thing on the circuit are the horns.
The orange wire goes from the fuse to the relay.
Does the fuse blow if the relay is out of the plug ?
Could be a short in the wiring in the steering column but that should make the horn blow all the time.

Of couse there is a fuse , plus a relay ,wiring , switch in the steering wheel , horn slip ring etc... Testing at the relay could be done if you knew how. . If the fuse was blown it would be because of a electrical short . Fuse don't blow for no reason .
VEHICLE RELAYS Operation Diagnosis

If you know the fuse and relay have power, you should be able to jumper the relay and make the horn blow. The horn pad on the steering wheel usually grounds the relay. If you can jumper the relay and make the horn blow, the problem may be the horn pad or the clockspring in the steering column.

Usually when a horn stops working it is almost always a fuse or a relay. Check your owners manual to find the location of the horn fuse and the horn relay. Check these two low cost items first.

could be you might check it out. many items take the same relay so you might try exchanging it with another one with the same numbers. If that isn't it you may have a short in the horn itself.

Well, it could be a fuse. Check the associated fuse, if it is ok then proceed to checking for power at the horn (it should have 12v). If the horn has power then replace the horn. If it does not then seek proffesional certified help due to the fact that the problem is going to be in the steering column or horn pad, and that will require dealing with the airbag system (which is NOT recommended) unless qualified.

you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.

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.

you may need to put a relay in it as the current from the horn may be back feeding up the immobiliser horn circuit and causing a short. Sounds like the immobiiliser has its own source of power seperate from the factory circuit When you press the horn the power goes to the horn and up the immobiliser horn circuit and it blows the fuse.