For your own safety
See also:
Operation
Adjusting the volume
Turn the knob until the desired volume is reached. The setting is stored for
the remote control currently in use.
The vehicle automatically adjusts the volume of the microphon ...
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.
...