It is probably clogged with dirt and water. Either pull the old one out ant clean it or just buy a replacement horn. These are really easy to install, the hardest part is trying to find where the horn is.
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Re: I can barely hear my horn.
Hello it sounds like the is a problem with the contacts in your horn. nissan uses a disk type horn that when it starts going out may make a weird type tone or pop. It sounds as if its time for a replacement.Thank You
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pushing on the horn pad and listening you should hear the relay click. if so then find the horn and hit it while someone is pushing the horn pad. if it starts to work the horn diaphragm has dried out and needs replacing. if not then use a test light and check the power to the horn. if you have power and ground then the horn is bad. if not check for which ever one is missing until you find the broken or shorted wire.
you can switch between beeping and no beeping. the way to change it back to beeping, hold the lock and unlock button on your ikey for a couple seconds. the horn will go off to signal that it has worked.
The security module sends a signal to the horn when applying the lock button. The module is starting to go bad on you. I would replace it before you get stranded on the road for if totally bad the car will not start
Diagram should be on the inside of the fuse box or relay cluster lid/cover. If Test light has 1 wire and a sharp tip? Yes, but only if you push the horn button too ;-)
My guess is that the horn lost its ground, but you can check this with the light. The horn only beeps when both GROUND and Pos 12v are present. The horn button gives the relay 12v to close, and the relay gives the horn 12v to operate. The ground is always connected.
Connect tester clipwire to 12v source (battery, headlight (has to be on) and touch its tip to metal of car. Does it light? Good. the tester is working and the 12v is a good source.
Touch one of the 2 horn connection or wires (poke it thru the plastic - why tip is sharp). Does it light? Touch the other, does it?
If both light, (1 will be brighter) we can assume the horn coil is good and it is getting a good ground and I was wrong (it happens... but not often). The side that is BRIGHTER is the ground wire side.
Now have someone mash the horn button. Do you hear a tiny click? That is the horn relay. If not, look for the horn relay fuse and replace it. If you DID hear the click, the relay coil is good and is trying to switch 12v to drive the horn.
Now is time to locate and replace the horn fuse or the relay may have bad contacts. Look at the other relay part numbers in the cluster and see if there is a match for the horn one. Swap it out and try the horn.
Hope this all helps. To 'test' the horn, touch the dim side again anf listen for a scratching sound. That is the 12v going thru the tiny bulb in the tester (a resistance) and trying to drive the horn.
If you hear a click the power is working the relay. If no click under dash, possibly bad fuse or relay. If you hear relay, test horn. Unplug horn and run a 12V jumper to see if it beeps. If it doesn't, try to redo the ground and then test. Then if that doesn't work, replace horn.