[Wesley Yee]

I was adding some antifreeze fluid and slightly bump the car with my knee. All of a sudden, (first time ever) the alarm horn goes off. I didn't know how to stop it, but after 30 secs the horn went off by itself. I asked to myself why would the alarm horn go off when I didn't set the alarm. I tried setting the alarm and opening the door, the alarm didn't go off which further my suspicions that the two might be tied together somehow. I wonder if the alarm fails, does it fail open (meaning it doesn't work) or fail closed (which arms the unit, which is why I want to know how do I disarm the alarm system!)