BMW GRAN COUPE 4 Series Owner's Manual page 142

Controls
The setting is stored for the driver profile cur‐
rently used.
Display
Lamp in the exterior mirror housing
Prewarning
The dimmed lamp in the exterior mirror hous‐
ing indicates when there are vehicles in the
blind spot or approaching from behind.
Acute warning
If the turn signal is set while a vehicle is in the
critical zone, the steering wheel vibrates briefly
and the lamp in the exterior mirror housing
flashes brightly.
The warning stops when the turn signal is
switched off, or the other vehicle leaves the
critical zone.
Brief flashing
A brief flashing of the lamp during vehicle un‐
locking serves as system self-test.
System limits
Safety information
WARNING
The system can react incorrectly or not
at all due to the system limits. There is a risk of
accidents or risk of property damage. Observe
the information regarding the system limits
and actively intervene, if needed.◀
142
Safety
Online Edition for Part no. 01402978272 - II/17
Functional limitations
The system may not be fully functional in the
following situations:
▷ When a vehicle is approaching at a speed
much faster than your own.
▷ In heavy fog, rain or snowfall.
▷ In tight curves or on narrow lanes.
▷ If the bumper is dirty or iced up, or covered
with stickers.
▷ If cargo protrudes.
A Check Control message is displayed when
the system is not fully functional.
Brake force display
Concept
Additional brake lamps indicate emergency
braking to the traffic behind. This can reduce
the risk of a rear-end collision.
General information
▷ During normal brake application, the bot‐
tom brake lights light up.
▷ During heavy brake application, the top
brake lights additionally light up.
Attentiveness assistant
Concept
The system can detect decreasing alertness or
fatigue of the driver during long, monotonous