Hi, I just bought a 2003 Lincoln Navigator. I loved my truck and I'm trying to learn everyday from all the buttons it has. I have read the manual looking for something. The car alarm doesn't sound when I press the button in the beeper to loock the car. I know the car is closed because I looked and heard the sound of the loocks. I read in the manual looking for information about how to fix that but I couldn't find anything. Does anyone know how I can do that? Thanks!!!