See also:

The concept
The following can be operated using the buttons and the thumbwheel on the steering wheel: Current audio source. Redial on telephone*. Activation of the voice activation system*. ...

Switching on/off
Switching on/off Press button 1 on the steering wheel. ▷ On: lane markings 2 are lit. ▷ Off: lane markings 2 go out. The system can issue warnings at speeds above approx. 40 mph/65 ...

Tire inflation pressure values up to100 mph/160 km/h
X3 28i X3 35i ...