See also:

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

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 tension ...

Lingering Issues
The X5 hasn't aged well. The styling — unchanged since the second generation hit dealerships in late 2006 — looks expressive up front but ham-handed in back. From the glove compartment to the cent ...