See also:

Signal tones
When approaching an object, an intermittent tone is sounded that indicates the position of the object. For example, if an object is detected to the left rear of the vehicle, a signal tone sounds ...

2011 BMW X3 Review by Mike Hanley
The BMW X3 may have been a pioneer among compact luxury crossovers, but a number of competitors — including the Audi Q5, Mercedes-Benz GLK-Class and Volvo XC60 — have entered the fray since its de ...

Interior motion sensor
For the sensor to function properly, the windows and glass sunroof/panoramic glass sunroof must be closed. ...