The light on the upper console only seems to come on when I first start the car and then go off even if there is no one in the front seat. Is this normal b/c in the benz the passenger airbag off light stays on until someone sits in the seat?

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2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options