[shorod]

If it truly is the factory system, I would suspect you have a flakey door ajar switch. The switch is located in the latch assembly, so you either have to replace the latch or clean it. I suggest spraying electrical contact cleaner into the door latch area and working the latch a few times. Some people use WD-40, but in my mind that is a short term fix. WD-40 is not a contact cleaner, and contains a lubricant which will collect dust and dirt and gunk, likly gum up, and only last a short time.

I don't believe that the factory alarm system has a shock sensor, only door, hood, and trunk pin switches. It is part of the Generic Electronic Module (GEM). If you have the remote keypad, you will also have a Remote Anti-theft Personality (RAP) module for the keypad.

I would bet that a door pin switch is your problem though.

-Rod