You could try pressing the switch.
The wiring to the horn is shorting out at times. Check the horn relay, and the wiring to find where the system shorts when the Jeep brakes.
On a jeep that new i would check the fuse panel and repace the fuse for the horn. The horn shouldn't be defective but if the fuse doesn't solve the problem, have dealer replace horn under warranty.
If the fuses are good on a 1996 Jeep Cherokee and the horn still will not work, check the horn relay switch on the passenger side fender wall inside the engine compartment. Also check to make sure that the horn is hooked up properly.
To fix a Jeep Wrangler horn, first check the fuse related to the horn in the fuse box; replace it if it’s blown. Next, inspect the horn relay and wiring for any damage or loose connections. If the horn still isn’t working, test the horn itself by connecting it directly to a power source. If it doesn’t sound, you may need to replace the horn.
Just for kicks check the voltage going to the horn, but I am prett sure you'll just need to replace the horn itself.
The horn fuse on a 2002 Jeep Liberty is located in the fuse box under the hood. You can find the fuse box near the battery, and the specific fuse for the horn is typically labeled as "Horn" in the diagram on the cover of the fuse box. If you're having issues with the horn, check this fuse to see if it needs to be replaced.
Check the fuses for your brakes.
Yes. Remove the existing horn or horns, attach your new horn and connect the horn wires. The horn wires will probably have a JEEP wire plug on the end that will need to be removed or altered.
To check if a car horn is bad, start by pressing the horn button while someone else listens closely near the horn itself. If there's no sound or a weak sound, the horn may be faulty. You can also check the horn's wiring and connections for corrosion or damage, and test the horn with a direct power source to see if it works. If it still doesn't function, it likely needs to be replaced.
Check fuse. The horn is on the same fuse as the cig lighter...check your cig lighter to see if it works. if it's working it could be a short on the wire to the horn..or the horn just might need to be replaced.
On a 1982 Jeep CJ7, the horn is typically powered through a fuse labeled "Horn" in the fuse box. This fuse is usually a 15-amp fuse, but it's always advisable to check the owner's manual or the fuse box cover for specific details, as configurations can vary. If the horn is not functioning, checking this fuse is a good troubleshooting step.
So what is the question about your 1991 Wrangler horn?