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. ...

The concept
The Check Control monitors vehicle functions and alerts you to any malfunctions in the systems monitored. A Check Control message consists of indicator and warning lamps in the instrument clust ...

Intermittent operation or rain sensor
The concept The rain sensor automatically controls the time between wipes depending on the intensity of the rainfall. The sensor is located on the windshield, directly behind the interior rearv ...