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After travel has begun, the system is trained
about the driver, so that increasing lack of alert‐
ness or fatigue can be detected.
This procedure takes the following criteria into
account:
▷ Personal driving style, for example, steering
behavior.
▷ Driving conditions, for example, length of
trip.
Starting at approximately 43 mph/70 km/h, the
system is active and can display a recommen‐
dation to take a break.
Break recommendation
If the driver becomes increasingly less alert or
fatigued, a message is displayed in the Control
Display with the recommendation to take a
break.
A recommendation to take a break is displayed
only once during an uninterrupted trip.
After a break, another recommendation to take
a break cannot be displayed until after approxi‐
mately 45 minutes.
System limits
The function may be limited in the following sit‐
uations, for instance, and will either output an
incorrect warning or no warning at all:
▷ When the clock is set incorrectly.
▷ When the vehicle speed is mainly below
about 43 mph/70 km/h.
▷ With a sporty driving style, such as during
rapid acceleration or when cornering
quickly.
▷ In active driving situations, such as when
changing lanes frequently.
▷ When the road surface is poor.
▷ In the event of strong side winds.
PreCrash
The concept
The system is used to detect critical driving sit‐
uations that might lead to an accident. In these
situations, preventative protection measures
are automatically undertaken to minimize the
risk in the event of an accident as much as pos‐
sible.
Critical driving situations may include:
▷ Full brake applications.
▷ Severe understeering.
▷ Severe oversteering.
If the vehicle includes the collision warning or
collision warning with braking feature, impend‐
ing collisions with vehicles driving ahead or
stopped in front of you can also be detected
within the system's range.
Personal responsibility
The system cannot serve as a substitute
for the driver's personal judgment of the traffic
situation. The system may not always detect
critical situations reliably and in a timely manner.
Adapt speed to traffic situation and drive alertly;
otherwise, a risk to safety may result.◀
Function
After the safety belt is buckled, the front belts
are automatically pretensioned once after the
vehicle is driven is away.
In critical driving situations, the following indi‐
vidual functions become active as needed:
▷ The front belts are automatically preten‐
sioned.
▷ Automatic closing of the windows.
▷ Automatic closing of the glass sunroof.
▷ For vehicles equipped with power seat ad‐
justment: automatic positioning of the back‐
rest for the front passenger seat.
After a critical driving situation without an acci‐
dent, the front belts are loosened again. All other
systems can be restored to the desired setting.
Seite 109
Safety Controls
109
Online Edition for Part no. 01 40 2 917 825 - II/13
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