Just yesterday my Honda Fit 13' Sport started having an issue where the alarm keeps going off. I almost got ticketed and towed but I was able to get home just in time to disarm it. I suspect there is a broken sensor in one of the doors for the locks, the passenger door lock was making some weird sounds. The horn doesn't beep when I lock the car and the red blinky light doesn't turn on in the dash reliably. I did eventually manage to get it to beep upon lock and the red light turned on and I didn't have any issues overnight then it just started randomly going off again this morning.

Is there a fuse I can pull to disarm the system? There is no alarm marked in the fuse box. I plan to try to take it in next week to a dealer but if there was just a way to disarm it that would be preferable, it's in such a sad state no one would steal it. Currently I'm just keeping the doors unlocked, but I'm still worried to leave my house this weekend now because I'm worried it'll start going off at any moment and I'm gonna end up with a $500 bill for the ticket and towing fees. I was thinking I might pull either the Horn/Hazard fuse or the Stop/Horn fuse, and if those don't work just unhook the car battery.

 

As I remember there are two stock horns in the '13 Fit. One is bolted to the upper radiator support under an upper plastic panel that is accessible by raising the hood. That plastic panel can be removed by removing 8-10 plastic push pins. They can be removed with a push pin removal tool or a medium flat bladed screw driver. I believe that horn is sounded by pressing the horn button on the steering wheel. The second horn can be accessed through the driver side fog light hole by simply removing one screw and removing the fog light assembly and then reaching up into the area behind the fog light and removing a bolt that secures the horn. You can also access that horn by removing the front bumper cover. This horn is the one that goes off with the alarm. As a temporary fix, you can simply unplug that horn by removing the attached horn wire until it can be determined what the cause is of the alarm/horn going off.

You won't find a simple fuse fix for shutting the horn off. The horns are powered by a relay found in the under the hood fuse box..By removing the under hood fuse box cover I believe the horn relay is marked by a diagram printed on the under side of the cover. Good luck in finding the fix.

 

Thanks Dan ~ I was wondering where the alarm system horn Is I was just gonna take a towel or something and plug it up so I won’t ignore the neighbors hopefully when I just connect the wire it won’t prevent me from putting my car into gear because if you pull out the fuse for the horn on the driver side fuel panel fuse panel. Everything seems great until you try to put it into gear and by disabling the horn with the fuse, you disable the shift liver from going into Drive. It won’t even come out a park, but I’ll give this a try tomorrow. It’s 12° here in Connecticut, but luckily a big ass raccoon knocked out my driver side. light and I think I might be able to sit my hand in there and hopefully find a horn in the wire so thanks for the info

 

The alarm horn is behind the front bumper cover at the level of the driver's side fog light- bolted to the front metal structure. If you have a sport model, you can access the horn by removing the driver side fog light by removing one screw holding it to the bumper cover.
You can then simply disconnect the horn wire from the horn to disable it.