Close the windows and glass sunroof
Driving with the glass sunroof and windows open results in increased air resistance and raises fuel consumption.
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.
...
1982: the second generation - four-door, Convertible, Touring and BMW M3,
plus the first diesel engine for the sports sedan
The new BMW 3-Series oozed progress and variety out of every pore, as its
fresh new design, optimised aerodynamics, improved space and comfort, higher
output and additional body and engine variant ...
Issuing a warning
If the vehicle begins leaving the lane and a lane
marking has been detected, the steering wheel
begins vibrating.
If the turn signal is set before the lane is
changed, a warning is not issued.
...