I have a 2006 charger sxt 3.5 . The problem is when I get out of the car and hit the door lock button, It seems the factory alarm is not arming. I know because the red dot on the dash doesnt flash like the manual says it should(except once when you first hit it) and second I have armed it while outside the car with the window down and waited 5 mins and then reached in to open the door from the inside, and nothing happens ?Help !!!! Any thoughts why its not working?