:doh:

valet mode.

its a pretty basic function. Chances are your alarm arms automatically after 30sec or so. The valet mode shuts this off so if you take your car to get worked on or something, the alarm isn't going off all the time.

put your key in the ignition, and turn it to on, but don't start the car. Then press the killswitch button for the alarm, and that should deactivate the valet mode.