BMW 3 SERIES SEDAN Owner's Manual page 109

Safety Controls
If the belt tension does not loosen automatically,
stop the vehicle and unbuckle the belt using the
red button in the buckle. Fasten the belt before
continuing on your trip.
PostCrash
If an accident above a certain degree of severity,
the system automatically brakes the vehicle to a
standstill. This can reduce the risk of a further
collision and the consequences thereof.
Depressing the brake pedal can cause the vehi‐
cle to brake harder. This interrupts automatic
braking. Depressing the accelerator pedal also
interrupts automatic braking.
After coming to a halt, the brake is released au‐
tomatically. Secure the vehicle against rolling.
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