Original horn got stuck and burn up, I installed

You may have wires that have become crossed. The wire to the horn and a hot wire have probably lost the outer insulation and crossed each other causing the horn to start honking when it is connected. Check the wires with an electrical tester.

Could be a short in the steering wheel or column. Or a faulty horn relay.
You may need a wiring diagram to trace the circuits from the relay.
Usually the black wire is the ground and the green is voltage from the relay.

1Buy a horn kit. Direct replacement kits for the Jeep Grand Cherokee models will have only one horn, but many aftermarket kits consist of two horns.

2Locate the original manufacturer's horn. The horn for the Jeep Grand Cherokee is mounted under the right turn signal behind the front bumper. The easiest way to access it is from underneath the front of your Jeep.

3Disconnect the power connector from the horn, unscrew the mounting bolts with a socket wrench and remove the original horn. If you are installing a factory replacement, you can simply attach the old wiring harness to the new horn and mount it in the original location. However, if you are installing two horns, you will need to find a sturdy location with minimal vibrations.

4Splice the original pair of wires to the two horns according to the instructions for the new horns. The kit should include the connectors that you will need. Generally, you will splice a Y connection to each original wire to produce two pairs of wires that are connected to a new wiring harness. You will then connect each harness to one of the new horns.

5Test the new horns to ensure they work.

*I've done this myself on a few of my Jeeps, these directions are the simplest though, but do not take into account any "issues" . For the simplest fix, i would by a replacement horn (same year and model) from a breakers and install, if you're brave you can buy a cheap one form amazon or ebay.

Most vehicles have a horn relay, which should be in a fuse box under the hood. Toyota is usually pretty good at identifying the various relays and fuses in the fuse box. If your original horn was shorted, it very well could have welded the contacts in the horn relay together. Also an aftermarket horn could be drawing more amperage than an original equipment unit, causing the fuse to burn. This last statement is purely conjecture.

http://www.explorerforum.com/forums/showthread.php?t=180814

Make sure you are in the right box for the horn. Looks like 10 (PD) and 29 (Interior)

I'd raise the hood, find the horn and remove the wire's from it. Should be a plug that you can release the tab and pull the plug off. You may have a relay stuck or the physical horn button. Look in the fuse block and see if you have a horn relay. You may also be able to remove a fuse to disable the horn.

• Locate the original manufacturer's horns by looking under the hood.the most likely location is under the passenger side headlight.

• Remove the passenger headlight. Unscrew two nuts on each side of the headlight with a socket wrench and remove it to expose the horns. Loosen the mounting bolt for the old horns with a socket wrench and unplug the power connectors. Remove the two horns.

• Mount the new horns with the attachments that came in the kit. You should be able to simply mount the new horns in the old brackets if your kit is a direct factory replacement. Some custom horn kits include air compressors that may require you to install the horns in a non-standard location.

• Plug the old wiring harnesses into the new horns if they are compatible to retain the factory wiring. Some aftermarket horn kits may include a custom wiring harness that you will need to connect to your car's original wiring using a wire/crimper splitter.
  

• Test the new horns to ensure they work. Be aware that horns that use a compressor will be extremely loud.
  
  
  
  
  

Luckily the horn system is fairly primitive. The likely causes in order of likelyhood are:

1- Horns failed (common from water intrusion). Relatively inexpensive to replace.

2- Relay stuck/burned out or fuse burned out. Inexpensive to replace, but may have underlying cause

3- Wiring fault of some sort. Depends on severity of damage

4- Horn button fault. Expensive to replace (part of airbag)

I have replaced many many Toyota LC and LX470 horns from water damage/age. Your problem is likely horn or fuse related.

You can use any horn of your choice.It's like you are buying a pair of tyres and it varies from made to price and check with the seller if it is road legal as it varies from countries.Hope this helps.

OK, here is a step by step guide to help you replace the horn at hand.


Step1 Locate the stock horn. It will be in the front under-hood area of the truck and may be under the battery or inside the area between the fender and the inner fender. Behind the grille is also a possible location for the stock horn.
Disconnect the power wire, which will be attached to a spade on the horn. If possible, remove the horn. The horn will be held in place with a small bolt. Step2 Purchase a replacement horn, either from the dealer or a universal aftermarket model from an automotive parts dealer. Step3 Install the horn in the original mount if a stock horn is the replacement choice. Reconnect the power wire. Step4 Mount a universal horn in the stock bracket if possible, or use a large self-tapping screw and mount in a convenient location using the bracket that is supplied with it. Step5 Connect the wire connector to the horn. In most cases the stock wire connector will simply plug on to the spade connection of the new horn. If it does not fit, cut off the original connector and replace it with a solderless female spade connector and plug that onto the horn terminal. If the horn has two terminals, the other is to be grounded to the car body using a self-tapping screw.


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