Rep Power: 0

I have a factory car alarm in my Honda Civic and my brother pressed something that now when I arm it the lights don't flash and the car doesn't honk like it used to to let me know I locked the doors. The panic button still works sounds when you push it. It's not the battery in the remote either cause I tried both remotes that I have. How do I get it to arm the way it used to? Please help!it's a 2003 Honda Civic LX