See also:

Automatic deactivation of the front passenger airbags
The occupation of the seat is detected by evaluating the impression on the occupied seat surface of the front passenger seat. The front and side airbags on the front passenger side are activate ...

Deactivating HDC
Press the button again; the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

Following part replacement
The same breaking in procedures should be observed if any of the components mentioned above have to be renewed in the course of the vehicle's operating life. ...