it just indicates there is a fault, push one of the black knobs (the one opposite to the trip reset - I always confuse them) and hold and it will tell you what is wrong

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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