1995 Buick LeSabre the horn started going off for no reason. Won't stop. How can I fix this or what would have caused it?

Unplug directly on the horn if you can find the horn fuse. Which probably controls more than just the horn.

a new horn!

Have you checked all your wiring to the horn and made sure there is no shorts in it ????

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Hi,
My name is Ben and I'm your guru, i.e., mentor, an influential teacher or popular expert: a management guru. - origin from Sanskrit, 'weighty, grave', for today.
Subject: How to check an inoperative horn
Customer's exact description: ...the horn on my 1995 Buick LeSabre does not work...how to fix?
Here's how it's done:
Step 1. Start with the pre-check:

Do a Thorough Visual Inspection
Do a thorough visual and "hands-on" underhood inspection before starting any diagnostic procedure! You can find the cause of many problems by just looking, thereby saving yourself a lot of time. • Has the vehicle been serviced recently? Sometimes things get reconnected in the wrong place, or not at all. • Don't take shortcuts. Inspect connectors and wiring which may be difficult to see due to location.
Step 2. Instructions:
One. Remove the horn relay and check for battery voltage at the relay connector terminals.

• If battery voltage is present at both terminals, go to Two.
• If battery voltage is not present, check the ORN wiring and the relay fuse for circuit.

Two. With the horn switch depressed, measure voltage from the relay terminals. Wear hearing protectors, if someone is assisting you and depressing the horn switch while you're under the hood.

• If voltage is present, go to Three.
• If battery voltage is not present, check the black wire for an open circuit; check the connectors for proper terminal contact; check the in-line connector for proper terminal contact; check the spring loaded contact, slip ring, and horn switch for an open circuit.

Three: Connect a fused jumper from relay connector terminal 30 to terminal 86.

• If the horn does not sound, go to Four.
• If the horns sound, replace the horn relay.

Four: Disconnect the the suspect horn connector. Connect a fused jumper from the suspect horn terminal B (dark green) to the positive + battery terminal.

• If the horn sounds, check the wiring to the horn relay for an open circuit or short to the ground.
• If horn doesn't sound, check the black wiring for an open circuit, if OK, then replace the horn.

All the best,
Ben

the contact in the steering wheel is shorting out, all you can do is replace it,, however,, any time your messing with the steering wheel or anything associated with it, you must use extreme care,, prior to doing anything, disconnect the Neg battery terminal,, then the positive one, and wait 10 minutes, this will allow the air bag system time to discharge, the last thing you need is the air bag going off, once this has been done, behind the wheel, there will be recessed screws that hold on the face of the steering wheel cover,, remove those, and pull off the cover gently,, your going to have a single wire, ( there are others, But your concerned with the single one, that's for the horn) make sure that is secure . if it seems that wire hasn't worked loose then your problem is going to be in the contacts on the horn buttons, some of these are actually molded into the cover and can't be replaced,, which would mean you have to replace the cover itself,,

Check for voltage at horn. Most horns get water in them and stop working.

There will be a horn relay that is stuck replace it,it is in with the fuse/relays

no. the horn switch is underneath the airbag, and if the horn is activating itself late at night (when it is cold) then the switch is most likely what it is. the cold makes the plastic around the airbag and switch contract, causing the horn to make contact. if you want to just silence the horn, you can remove the horn relay in the underhood fuse box. should be labeled in the owners manual

YOU have a bad horn contact pad.