See also:

Functional readiness of the airbagsystem
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 tensioner. ...

Wheels with electronics for TPM Tire Pressure Monitor
When mounting new tires or changing from summer to winter tires or vice versa, only use wheels with TPM electronics; otherwise, the Tire Pressure Monitor will not be able to detect a flat tire ...

Switching the interior lamps on and off
Switching the interior lamps on and off Press the button. To switch off permanently: press the button for approx. 3 seconds. To clear this setting: briefly press the button. ...