incase u didnt know there are five horns i to have a 98 deville delegance 2 are under car 1 next to the battery i honestly cant remember where the other 1s are but wen u look at the 1 by the battery look 4 4 more of those its probably a fuse or relay if they all stopped working at once
In the trunk, remove the back panel by unscrewing the four plastic knobs on the roof of the trunk, there is the entire fuse box for the vehicle
Carefully
where is the horns for 1978 cadillac
Under the battery tray
under the fuses beneath the hood. look back and it has a cover on it that you have to remove. then 2 fuse boxes. relays are beneath there. horn relay should be on far right.
Horns (there are usually 2 or 3) are located in the top forward fender area. Accessed from under the hood, you will find them outboard of the windshield washer fluid jug on the drivers side or outboard of the battery on the passengers side. Cadillac Man
on the middle of the steering wheel
Remove the plastic "filler panel" between the radiator mount (top) and the front grill on the driver side. They are attached to the radiator mount (top)and are not visible unless the "panel" has been removed.
The horn is located behind the front bumper fascia
in the horn distributor located below the top of the steering wheel, and above the bottom of it.
The horn is located under the passenger side headlamp assembly.
If you mean the warning light, This is done with a scan tool with the appropriate program. It should be noted however, that the light will turn on again if the problem is not located and fixed. If the horn also doesn't work as well as the cruise control, my money would be on a bad clockspring. The clockspring located in the steering column provides ground for the airbag,horn and cruise control.