
Seat beltsAdjusting the driver's and front-
passenger seat belt .........................4 5
Automatic comfort-fit feature .......... 44
Cleaning ......................................... 269
Correct usage .................................. 43
Fastening ......................................... 43
Important safety guidelines ............. 42
Introduction ..................................... 41
Releasing ......................................... 44
Switching belt adjustment on/off
(on-board computer) ...................... 201
Warning lamp ................................. 225
Warning lamp (function) ................... 45
Seats
Adjusting (electrically) ..................... 97
Adjusting the 4-way lumbar sup-
port ................................................ 100
Adjusting the head restraint ............ 98
Adjusting the multicontour seat ..... 100
Cleaning the cover ......................... 268
Correct driver's seat position ........... 96
Folding the backrests forward/
back ................................................. 99
Important safety notes .................... 96
Overview .......................................... 96
Seat backrest display message ..... 222
Seat heating .................................. 100
Seat heating problem .................... 102
Storing settings (memory func-
tion) ............................................... 108
Switching AIRSCARF on/off .......... 102
Switching seat heating on/off ....... 100
Switching seat ventilation on/
off .................................................. 101
Section
Trunk ............................................... 80
Securing cargo .................................. 242
Selector lever
Cleaning ......................................... 268
Sensors (cleaning instructions) ....... 267
Service menu (on-board com-
puter) .................................................. 198
Service message
see ASSYST PLUS
Service products
Brake fluid ..................................... 315
Coolant (engine) ............................ 316 Engine oil ....................................... 315
Fuel ................................................ 313
Important safety notes .................. 312
Refrigerant (air-conditioning sys-
tem) ............................................... 317
Washer fluid ................................... 316
Setting the air distribution ............... 122
Setting the airflow ............................ 123
Setting the date
 /time format
see also Digital Operator's Man-
ual .................................................. 234
Setting the language
see also Digital Operator's Man-
ual .................................................. 234
Setting the time
see also Digital Operator's Man-
ual .................................................. 234
Settings
Factory (on-board computer) ......... 201
On-board computer ....................... 198
Side impact air bag ............................. 47
Side marker lamp (display mes-
sage) ................................................... 211
Side windows
Cleaning ......................................... 266
Important safety information ........... 82
Opening/closing .............................. 83
Opening/closing (all) ....................... 83
Problem (malfunction) ..................... 85
Resetting ......................................... 84
Reversing feature ............................. 82
SIRIUS services
see also Digital Operator's Man-
ual .................................................. 234
SmartKey
Changing the battery ....................... 76
Changing the programming ............. 74
Checking the battery ....................... 76
Display message ............................ 223
Door central locking/unlocking ....... 73
Important safety notes .................... 73
Loss ................................................. 77
Mechanical key ................................ 75
Opening/closing soft top ................. 87
Overview .......................................... 73
Positions (ignition lock) ................. 128
Problem (malfunction) ..................... 77
Starting the engine ........................ 130
16Index 

Rif the vehicle skids, the front side windows are
closed.
Rthe air pressure in the side bolsters of the seat
backrests of the front multicontour seats is
raised.
If the hazardous situation passes without result-
ing in an accident, PRE-SAFE
®slackens the belt
pre-tensioning. On vehicles with multicontour
seats, the air pressure in the side bolsters is
reduced again. All settings made by PRE-SAFE
®
can then be reversed.
If the seat belt pre-tensioning is not reduced:
XMove the seat backrest or seat back slightly
when the vehicle is stationary.
The seat belt pre-tensioning is reduced and
the locking mechanism is released.
The seat-belt adjustment is an integral part of
the PRE-SAFE
®convenience function. Informa-
tion about the convenience function can be
found under "Belt adjustment" (
Ypage 45).
PRE-SAFE®PLUS (anticipatory occu-
pant protection system PLUS)
Introduction
PRE-SAFE®PLUS is only available in vehicles
with the Driving Assistance package.
Using the radar sensor system, PRE-SAFE
®
PLUS is able to detect that a head-on or rear-end
collision is imminent. In certain hazardous sit-
uations, PRE-SAFE
®PLUS takes pre-emptive
measures to protect the vehicle occupants.
Important safety notes
The intervention of PRE-SAFE®PLUS cannot
prevent an imminent collision.
The driver is not warned about the intervention
of PRE-SAFE
®PLUS.
PRE-SAFE®PLUS does not intervene if the vehi-
cle is backing up.
When driving, or when parking or exiting a park-
ing space with assistance from Active Parking
Assist, PRE-SAFE
®PLUS will not apply the
brakes.
Function
PRE-SAFE®PLUS intervenes in certain situa-
tions if the radar sensor system detects an
imminent head-on or rear-end collision.
PRE-SAFE
®PLUS takes the following measures
depending on the hazardous situation detected:
Rif the radar sensor system detects that a
head-on collision is imminent, the seat belts
are pre-tensioned.
Rif the radar sensor system detects that a rear-
end collision is imminent:
-the brake pressure is increased if the driver
applies the brakes when the vehicle is sta- tionary.
-the seat belts are pre-tensioned.
The PRE-SAFE®PLUS braking application is can-
celed:
Rif the accelerator pedal is depressed when a
gear is engaged
Rif the risk of a collision passes or is no longer
detected
Rif DISTRONIC PLUS indicates an intention to
pull away
If the hazardous situation passes without result-
ing in an accident, the original settings are
restored.
Automatic measures after an acci-
dent
Immediately after an accident, the following
measures are implemented, depending on the
type and severity of the impact:
Rthe hazard warning lamps are activated
Rthe emergency lighting is activated
Rthe vehicle doors are unlocked
Rthe front side windows are lowered
Rvehicles with a memory function: the electri-
cally adjustable steering wheel is raised
Rthe engine is switched off and the fuel supply
is cut off
Rvehicles with mbrace: automatic emergency
call
56Occupant safety
Safety 

Folding the seat backrest forward
The seat moves forwards if you have folded the
backrest forwards and th eseat is in th erear half
of th erange. This makes it easie rfor passenger s
to get int oand out of th erear compartment. The
head restrain tis lowered simultaneously.
XPull seat release handle :forwards and fol d
th ebackrest forwards as far as it will go.
The seat automatically moves to th eforemost
position and th ehead restrain tis lowered.
Folding the seat backrest back
XSwing bac kth eseat backrest .
The seat moves automatically to th estore d
position .
Adjusting the multicontour seat
:To adjust th ethigh cushion
;To adjust th ebackrest contour in th elumba r
region
=To adjust th ebackrest contour in th eupper
bac kregion
?To adjust th eside bolsters of th eseat back-
res t You can adjust th
econtour of th efron tseat
individually so as to provide optimum support
for your bac kand sides.
XTurn th eSmartKey to position 2in th eignition
loc k (Ypage 128).
Adjusting the 4-way lumbar support
:To rais eth ebackrest contour
;To softe nth ebackrest contour
=To lower th ebackrest contour
?To harden th ebackrest contour
You can adjust th econtour of th efron tseat
backrest sindividually to provide optimum sup-
por tfor your back.
Seat heating and seat ventilation
Switching the seat heating on/off
GWARNIN G
Repeatedly switching on th eseat heating can
caus eth eseat cushion and backrest pads to
become ver yhot .The healt hof person swit h
limite dtemperature sensitivit yor alimite d
abilit yto reac tto excessively high tempera-
tures may be affected or they may eve nsuffer
burn-like injuries. Ther eis aris kof injury.
Therefore, do no tswitch th eseat heating on
repeatedly.
100Seats
Seats, steering wheel and mirrors