Why does my car make a loud sound from under the hood when I unlock my car? on 2006 Chrysler 300

My car makes a sound when I unlock it with the wireless key remote. It's getting louder and very annoying. I've taken my car to the dealership twice for this problem and the service advisor told me the tech cannot locate the problem. This is not normal. It started out happening first thing in the morning when I unlocked my car. Now it's happening every time I unlock my car. Grrr!

Asked by for the 2006 Chrysler 300