Hi, I have had several cars that each have a "Passenger Airbag Light Deactivated " light on the center column. This light only ever activated when there was weight on the seat, but not enough weight to be a person. E.g. You have groceries on the seat and the car is letting you know the airbag is off. My question is, why is this light always on on my new CLA with nothing in the seat? Is this normal?