See also:

Functional readiness of the airbag system
When the ignition is switch on, the warning lamp in the instrument cluster lights up briefly and thereby indicates the operational readiness of the entire airbag system and the belt tensione ...

Controls
Controls 1. Press: switch the DVD system on/off Turn: left headphone volume and vehicle volume 2. Eject CD/DVD 3. Beginning of track     Stop     Play ...

Activating HDC
Press the button; the LED above the button lights up. ...