Rep Power: 0

Honda Civic 2006
My alarm kept going off after some one attempted to break into my car. This caused my car to set its alarm off anytime the door opened. I got that part fixed but when it happened my brother pulled a fuse or unplugged something to make the horn stop. Neither me or the people at autozone can figure out what is missing or un plugged. I really don’t want to spend a lot of money at the dealership so any advice is helpful. I hear a click when I press the horn button so I’m sure that’s the relay.
Also I don’t speak to my brother because he’s a very rude person who I’m sure wouldn’t help anyway just out of spite.

 
Rep Power: 222

Find the horn see if its disconnected. Otherwise you're going to have to pay a shop

 
Rep Power: 126

Not sure if this generation civic is like this but the fuse for the 7th gen that powers the horn also powers the rear brake lights. I’d see if your rear brake light is working.

 
Rep Power: 512

looks like it does. It's fuse 12 in the engine bay