This is caused by the door jamb switch. This is the sensor that, if the door is open, the dome light goes on and the alarm beeps if keys are in the ignition, or even the headlights are on. Sometimes they just fall apart b/c they are plastic. It costs only a few bucks. Pull it out with pliers and and plug in the new on. Takes 1-2 minutes to do. Just make sure you do not lose the wire harness in the door when you pull out the junk one. You can also break, crack, or do whatever to the old one.
One way to test this is to open one door at a time, and if you do not here the alarm buzz when the door is open, that is the one that is busted. Good luck
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