My 2000 Jeep Grand Cherokee is having a problem where the horn will not stop blaring. The fuse is good, as well as the horn relay.

Under the hood- driverside there should be a fuse box on the top of the box it should tell you what the horn relay is.

If it is the horn, pull the horn fuse or relay. Does the vehicle start and drive, ok? Of course, pulling the fuse or relay isn't the proper fix. I'm just talking about killing the horn, where applicable.

YOU MAY HAVE A DEFECTIVE HORN ASSEMBLY,OR A BLOWN HORN FUSE, ONE COMMON FAILURE IS THE RELAY, HAVE SOMEONE CHECK THE RELAY & FUSE FIRST THEN THE CONDITION OF THE HORN SWITCH ASSEMBLY AND CONTACTS IN STEERING ASSEMBLY THEY TEND TO WEAR AND WARP OUT OF SHAPE AND SOME BENDING BACK IN SHAPE SOMETIMES HELP,

locate the horn under tha headlamp and unplug it or remove horn relay from fuse box

To Larry Crowley,
Did you ever correct the problem to your 2000 Jeep Grand Cherokee and did you in fact determine that the problem was in fact the Body Control Module (BCM)?
I too have a 2000 Jeep Grand Cherokee Ltd with 162,000 miles. Up until just a few months ago, I never had any major problems with the car however in early December one evening the car was turned off and parked in my garage and the horn just went off out of nowhere, a solid horn...it was deafening! We unplugged the battery for the night so it wouldn't drain the battery. The next day I took the car to the mechanic who replaced the horn switch and relay. We thought that had fixed the problem. An hour after I left the mechanic with the car both the BRAKE and ABS lights on my dash went on and my speedometer stopped working (very scary to drive that way). When I stopped the car and went to lock it with my keyfob, the solid horn went off again so obviously the problem was not the horn switch and relay!?!? Over the past few months I have had my car to three different mechanics as well as the Jeep dealer and they have all concluded that the problem must be the BCM but they said that the only was they can properly diagnose the car is if it is acting up with the above mentioned symptoms while in the shop. Unfortunately it only acts up intermitently, not all the time. I am at such a loss. Currently we have removed the fuse for the horn so I am driving with no horn which is extremely unsafe! I look forward to any advice you have in this regard. Thank you!

Download From Internet ...Go to Google.com and Type Exemple
download Jeep Grand Cherokee 1996 Electrical Diagram ..then choose the on you need ..good luck

Sounds like the switch in the steering wheel is stuck if the horn won't stop sounding. They get rusty and stick. Sometimes you can take apart and sand them.

it is fuse # 13 (20AMP), check the horn relay (in relay center) and in Power Distribution Center fuse # F14

 You should check to see if you have power at the horn first. If you do, you need a new horn. I believe there is also a relay involved. Sometimes these are interchangable. You can take a relay like the one for the A/C and swap it with the horn one and see if the horn works. That will at least eliminate the relay.

Under the hood of your jeep on the passenger side there is the Power Distrubution Center (PDC). Remove the lid and thered will be fuses and relays in there. I could not locate the exact location of the horn reley, but if you start removing them one by one you can find the horn relay. You will know the right one when the horn stops.