Detail: When I unlocked my car with my key the alarm wouldn't go off. I turned the key to the right and it eventually went off.
Solution: Getting into a car that has the security system by unlocking the door with the key will set the alarm off. Usually you can relock and unlock the door with the key and the alarm will be turned off. There are several things that can set off an alarm depending on the sensors, so do you have a remote key FOB and if so does it work. I am including a link to Honda Tech article that may help you out: , Hi, a 6ya Mechanic can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck!