currently my honda insight 2011 facing this weird alarm problem. the car is come with cobra 4400 alarm installed.
the problem happen intermittent. when i arm the alarm, the siren will trigger one time and after few second to minutes the siren will continue to trigger. the siren only can be stop by disarm the car. from the alarm LED, it blink 8 times after the disarm.
you may refer to the youtube below to see how it happen
I had return n log this problem to Honda Service Center but due to the problem is happen intermittent, they say that they not able to detect it. Even in the ECU also dont have any error code.