The stock alarm is crap. Easiest way to bypass it is to jam a large flat head screw driver (with some good vise grips clamped to the end) into the key hole and turn. Alarm off, no broken glass and no noise. This is what they did to my car when they stole the stereo among other things I had in the car. Car was in my driveway right in front of the house and my bedroom window was right above it. Aftermarket alarm and fuel pump cutoff are some of the best deterrents.