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52 Occupant safety<br />
Safety<br />
situations (on vehicles with DISTRONIC<br />
PLUS)<br />
Rin critical driving situations, e.g. when<br />
physical limits are exceeded and the<br />
vehicle understeers or oversteers severely<br />
or when having to swerve to avoid an<br />
obstacle at a speed above 85 mph<br />
(140 km/h).<br />
PRE-SAFE ® takes the following measures<br />
depending on the hazardous situation<br />
detected:<br />
Rthe front seat belts are pre-tensioned.<br />
Runder accident conditions, the frontpassenger<br />
seat is adjusted if it is in an<br />
unfavorable position.<br />
Rincreases the air pressure in the side<br />
bolsters of the seat cushion and seat<br />
backrest of the active multicontour seats in<br />
the front.<br />
Rif the vehicle skids, the sliding roof with<br />
power tilt/sliding panel and the side<br />
windows are closed so that only a small gap<br />
remains.<br />
If the hazardous situation passes without<br />
resulting in an accident, PRE-SAFE ® slackens<br />
the belt pretensioning. The air pressure in the<br />
side bolsters on the active multicontour seat<br />
is reduced again. All settings made by PRE-<br />
SAFE ® can then be reversed.<br />
If the seat belts are not released:<br />
X When the vehicle is stationary, move the<br />
backrest or seat back slightly.<br />
The belt pretensioning is reduced and the<br />
locking mechanism is released.<br />
G Warning<br />
Make sure that nobody can become trapped<br />
as you adjust the seat.<br />
! Make sure that there are no objects in the<br />
footwell or behind the seats when resetting<br />
the seats. There is a risk that the seats<br />
and/or the objects could be damaged.<br />
More information about belt adjustment, a<br />
convenience function integrated into PRE-<br />
SAFE ® , can be found in the "Belt adjustment"<br />
section (Y page 56).<br />
NECK-PRO head restraints<br />
The NECK-PRO head restraints increase<br />
protection for the driver's and frontpassenger's<br />
head and neck. In the event of a<br />
rear collision of a certain severity, the NECK-<br />
PRO head restraints on the driver's and frontpassenger<br />
seats are moved forwards and<br />
upwards. This provides better head support.<br />
G Warning<br />
Do not secure any objects (e.g. coat hangers)<br />
on the NECK-PRO head restraints. Otherwise,<br />
the NECK-PRO head restraints may not<br />
function properly, or in the event of a rear-end<br />
collision may not be able offer the level of<br />
protection they are designed to provide.<br />
G Warning<br />
Only use seat covers/head restraint covers<br />
that have been tested and approved by<br />
<strong>Mercedes</strong>-<strong>Benz</strong> for your model.<br />
Using seat covers and head restraint covers<br />
other than those recommended may cause a<br />
malfunction when NECK-PRO head restraints<br />
are triggered or front side impact air bags/<br />
pelvis air bags may be prevented from<br />
deploying.<br />
Contact an authorized <strong>Mercedes</strong>-<strong>Benz</strong> Center<br />
for availability.<br />
If the NECK-PRO head restraints have been<br />
triggered in an accident, you must reset the<br />
NECK-PRO head restraints on the driver's and<br />
front-passenger seat (Y page 53).<br />
Otherwise, the additional protection will not<br />
be available in the event of another rear-end<br />
collision. You can recognize that NECK-PRO<br />
head restraints have been triggered by the<br />
fact that they have moved forwards and can<br />
no longer be adjusted.
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