Seat belts
Adjusting the driver's and front-
passenger seat belt .........................56
Adjusting the height ......................... 56
Belt force limiters ............................ 58
center rear-compartment seat .........57
Cleaning .........................................
309
Correct usage .................................. 55
Emergency Tensioning Devices ........ 58
Fastening ......................................... 56
Important safety guidelines .............54
Releasing ......................................... 57
Safety guidelines ............................. 41
Switching belt adjustment on/off
(on-board computer) ...................... 229
Warning lamp ................................. 257
Warning lamp (function) ................... 57
see Seat belts
Seats
Adjusting (electrically) .....................98
Adjusting lumbar support ..............100
Adjusting the 4-way lumbar
support .......................................... 101
Adjusting the head restraint ............ 99
Cleaning the cover ......................... 309
Correct driver's seat position ........... 96
Folding the backrest (rear
compartment) forwards/back .......272
Folding the rear bench seat
forwards/back ............................... 272
Important safety notes .................... 97
Seat heating problem .................... 101
Storing settings (memory
function) ........................................ 106
Switching seat heating on/off ....... 101
Sensors (cleaning instructions) .......307
Service menu (on-board computer) . 226
Service products Brake fluid ..................................... 370
Coolant (engine) ............................ 371
DEF special additives .....................369
Engine oil ....................................... 369
Fuel ................................................ 365
Important safety notes .................. 365
Refrigerant (air-conditioning
system) .......................................... 372
Washer fluid ................................... 372Settings
Factory (on-board computer) ......... 230
On-board computer ....................... 226
Setting the air distribution ...............133
Setting the airflow ............................ 134
Side impact air bag ............................. 45
Side marker lamp (display
message) ............................................ 241
Side windows Cleaning ......................................... 306
Convenience closing feature ............ 88
Convenience opening feature .......... 87
Important safety information
...........86
Opening/closing .............................. 87
Problem (malfunction) .....................89
Resetting ......................................... 89
Sliding sunroof
see Panorama roof with power
tilt/sliding panel
SmartKey
Changing the battery ....................... 77
Changing the programming ............. 75
Checking the battery ....................... 77
Convenience closing feature ............ 88
Convenience opening feature .......... 87
Display message ............................ 256
Door central locking/unlocking ....... 74
Important safety notes .................... 74
Loss ................................................. 78
Mechanical key ................................ 76
Positions (ignition lock) ................. 141
Problem (malfunction) .....................78
Starting the engine ........................ 143
Snow chains ...................................... 331
Sockets Center console .............................. 280
General notes ................................ 280
Luggage compartment ................... 281
Rear compartment ......................... 281
Spare wheel
Storage location ............................ 360
Stowing .......................................... 361
Specialist workshop ............................ 27
Special seat belt retractor .................. 61
Speed, controlling see Cruise control 16
Index
PRE-SAFE
®
(anticipatory occupant
protection system) G
WARNING
The PRE-SAFE ®
system reduces the impact of
an accident on vehicle occupants, as long as
their seat belts have been fastened correctly.
Although your vehicle is equipped with a PRE-
SAFE ®
system, the possibility of injury in the
event of an accident cannot be ruled out. You
should therefore always drive carefully and
adapt your driving style to the prevailing road,
weather and traffic conditions.
PRE-SAFE ®
takes preemptive measures to
protect occupants in certain hazardous
situations.
PRE-SAFE ®
intervenes:
R if BAS PLUS intervenes powerfully on
vehicles with DISTRONIC PLUS
R if, on vehicles with DISTRONIC PLUS, the
radar sensor system detects an imminent
danger of collision in certain situations
R in critical driving situations, e.g. when
physical limits are exceeded and the
vehicle understeers or oversteers severely
If the seat belts are not released:
X When the vehicle is stationary, move the
backrest or seat back slightly.
The seat belt pre-tensioning is
reduced and
the locking mechanism is released. G
WARNING
Make sure that nobody can become trapped
as you adjust the seat.
! Make sure that there are
no objects in the
footwell or behind the seats when resetting
the seats. There is a risk that the seats
and/or the objects could be damaged.
More information about seat belt adjustment,
a convenience function integrated into PRE-
SAFE ®
, can be found in the "Seat belt
adjustment" section ( Y page 56). NECK-PRO head restraints/NECK-
PRO luxury head restraints
NECK-PRO head restraints/NECK-PRO luxury
head restraints increase protection of the
driver's and front-passenger's head and
neck. In the event of a rear collision of a
certain severity, the NECK-PRO head
restraints/NECK-PRO luxury head restraints
on the
driver's and the front-passenger seats
are moved forwards and upwards. This
provides better head support. G
WARNING
Do not attach any objects (e.g. a coat hanger)
to the NECK-PRO head restraints/NECK-PRO
luxury head restraints. Otherwise, the NECK-
PRO head restraints/NECK-PRO luxury head
restraints may not function properly and in
the
event of a rear-end collision may not offer
the protection they are designed to provide. G
WARNING
Seat or head restraint covers can cause a
malfunction when the NECK-PRO head
restraints/NECK PRO luxury head restraints
are activated or when the
side impact air bags
or pelvis air bags are deployed, or they can
prevent this completely. The NECK-PRO head
restraints/NECK PRO luxury head restraints
or side impact air bags/pelvis air bags can
therefore not provide the intended protection.
Do not use any seat or head restraint covers.
If the NECK-PRO head restraints/NECK-PRO
luxury head restraints have been triggered in
an accident, reset the NECK-PRO head
restraints/NECK-PRO luxury head restraints
on the driver's and front-passenger seats
(Y page 53). Otherwise, the additional
protection will not be available in the event of
another rear-end collision. NECK-PRO head
restraints/NECK-PRO luxury head restraints
that have been triggered are moved forwards
and can no longer be adjusted. 52
Occupant safety
Safety
Correct use of the seat belts
G
WARNING
USE SEAT BELTS PROPERLY
R Seat belts can only work when used
properly. Never wear seat belts
in any other
way than as described in this section, as
that could result in serious injuries in the
event of an accident.
R Each occupant should wear their seat belt
at all times, because seat belts help reduce
the likelihood of and potential severity of
injuries in accidents, including rollovers.
The integrated restraint system includes
SRS (driver front air bag, driver's side knee
bag, front-passenger front air bag, side
impact air bags, pelvis air bags, window
curtain air bags for the side windows),
Emergency Tensioning Devices, seat belt
force limiters, and front seat knee bolsters.
The system is designed to enhance the
protection offered to properly belted
occupants in certain frontal (front air bags,
driver's side knee bag and ETDs) and side
(side impact air bags, window curtain air
bags, and ETDs) impacts which exceed
preset deployment thresholds and in
certain rollovers (window curtain air bags
and ETDs).
R Never wear the shoulder belt under your
arm, across your neck or off your shoulder.
In a frontal crash, your body would move
too far forward. That would increase the
chance of head and neck injuries. The seat
belt would also apply too much force to the
ribs or abdomen, which could severely
injure internal organs such as your liver or
spleen.
Adjust the seat belt so that the shoulder
section is located as close as possible to
the middle of the shoulder. It should not
touch the neck. Never pass the shoulder
portion of the seat belt under your arm. For
this purpose, you can adjust the height of
the seat belt outlet. R
Position the lap belt as low as possible on
your hips and not across the abdomen. If
the lap belt is positioned across your
abdomen, it could cause serious
injuries in
a crash.
R Never wear seat belts over rigid or
breakable objects in or on your clothing,
such as eyeglasses, pens, keys etc., as
these might cause injuries.
R Make sure the seat belt is always fitted
snugly. Take special care of this when
wearing loose clothing.
R Never use a seat belt for more than one
person at a time. Do not fasten a seat belt
around a person and another person or
other objects at the same time.
R Seat belts should not be worn twisted. In a
crash, you would not have the full width of
the seat belt to distribute impact forces.
The twisted seat belt against your body
could cause injuries.
R Pregnant women should also always use a
lap-shoulder belt. The lap belt portion
should be positioned as low as possible on
the hips to avoid any possible pressure on
the abdomen.
R Place the seat backrest in a position that is
as upright as possible.
R Check your seat belt during travel to make
sure it is properly positioned.
R Never place your feet on the instrument
panel, dashboard, or on the seat. Always
keep both feet on the floor in front of the
seat.
R When using a seat belt to secure infant
restraints, toddler restraints, or children in
booster seats, always follow the child seat
manufacturer's instructions. G
WARNING
Do not pass seat belts over sharp edges. They
could tear.
Do not allow the seat
belt to get caught in the
door or in the seat adjustment mechanism.
This could damage the seat belt. Occupant safety
55
Safety
Z
Never attempt to make modifications to seat
belts. This could impair the effectiveness of
the seat belts.
Fastening seat belts G
WARNING
According to accident statistics, children are
safer when properly restrained on the rear
seats than on the front-passenger
seat. Thus,
we strongly recommend that children be
placed in the rear seat whenever possible.
Regardless of seating position, children 12
years old and under must be seated and
properly secured in an appropriately sized
child restraint system or booster seat
recommended for the size and weight of the
child. For additional information, see the
"Children in the vehicle" section.
A child's risk of serious or fatal injuries is
significantly increased if the child restraints
are not properly secured in the vehicle and/
or the child is not properly secured in the child
restraint. X
Adjust the seat and move the backrest to
an almost vertical position ( Y page 96).
X Pull the seat belt smoothly through belt
sash guide 0043.
X Without twisting it, guide the shoulder
section of the seat belt across the middle of your shoulder and the lap section across
your pelvis.
X Engage belt tongue 0044 in buckle 0087.
X If necessary, adjust the seat belt to the
appropriate height (Y page 56).
X If necessary, pull upwards on the shoulder
section of the seat belt to tighten the belt
across your body.
All seat belts
except the driver's seat belt are
equipped with a special seat
belt retractor to
securely fasten child restraint systems in the
vehicle. For further information on special
seat belt retractors, see (Y page 61).
For more information about releasing the seat
belt with release button 0085, see "Releasing
seat belts" ( Y page 57).
Seat belt adjustment The seat-belt adjustment function adjusts the
driver's and front-passenger seat belt to the
upper body of the occupants.
The belt strap is tightened slightly when:
R
you engage the belt tongue in the belt
buckle and you then turn the SmartKey to
position 2 in the ignition lock.
The seat-belt adjustment will apply a
retraction force if any slack is detected
between the occupant and the seat belt. Do
not hold on to the seat belt tightly while it is
adjusting. You can switch the seat-belt
adjustment on and off in the on-board
computer (Y page 229).
The seat-belt adjustment is an
integral part of
the PRE-SAFE ®
convenience function. More
information about PRE-SAFE ®
can be found
in the "PRE-SAFE ®
(anticipatory occupant
protection system)" section ( Y page 52).
Belt height adjustment You can adjust the seat belt height on the
driver's seat and the front-passenger seat.56
Occupant safety
Safety
Child-proof locks
Important safety notes G
WARNING
When leaving the vehicle, always remove the
SmartKey from the ignition lock. Always take
the SmartKey with you and lock the vehicle.
Do not leave children unattended in the
vehicle, even if they are secured in a child
restraint system, or with access to an
unlocked vehicle. A child's unsupervised
access to a vehicle could
result in an accident
and/or serious personal injury. The children
could:
R injure themselves on parts of the vehicle
R be seriously or fatally injured through
excessive exposure to extreme heat or cold
R injure themselves or cause an accident with
vehicle equipment that can be operated
even if the SmartKey is removed from the
ignition lock or removed from the vehicle,
such as seat adjustment, steering wheel
adjustment, or the memory function
If children open a door, they could injure other
persons or get out of the vehicle and injure
themselves or be injured by following traffic.
Do not expose the child restraint system to
direct sunlight. The child restraint system's
metal parts, for example, could become very
hot, and the child could be burned on these
parts.
Child-proof locks for the rear doors G
WARNING
Children could open a rear door from inside
the vehicle. This could result in serious
injuries or an accident. Therefore, when
children ride in the rear
always secure the rear
doors with the child-proof locks.
You secure each door individually with the
child-proof locks on the rear doors. A door
secured with a child-proof lock cannot be
opened from inside the vehicle. When the vehicle is unlocked, the door can be opened
from the outside.
X
To activate: press the child-proof lock
lever up in the direction of arrow 0043.
X Make sure that the child-proof locks are
working properly.
X To deactivate: press the child-proof lock
lever down in the direction of arrow 0044.
Override feature for the rear side
windows G
WARNING
When children ride on the vehicle's rear seats,
activate the override switch. Otherwise, the
children could be injured, e.g. by trapping
themselves in the rear side window. X
To activate/deactivate: press button 0044.
If indicator lamp 0043 is lit, operation of the
rear
side windows is disabled. Operation is
only possible using the switches in the
driver's door. If indicator lamp 0043 is off, Children in the vehicle
63
Safety Z
Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your
vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Read the information on qualified
specialist workshops: ( Y page 27).Correct driver's seat position
X
Observe the safety guidelines on seat
adjustment ( Y page 97).
X Make sure that seat 0087 is adjusted
properly.
Electrical seat adjustment ( Y page 98)
When adjusting the seat, make sure that:
R you are as far away
from the driver's air bag
as possible.
R you are sitting in a normal upright position.
R you can fasten the seat belt properly. R
you have moved the backrest
to an almost
vertical position.
R you have set the seat cushion angle so that
your thighs are gently supported.
R you can depress the pedals properly.
X Check whether the head restraint is
adjusted properly.
When doing so, make sure that you have
adjusted the head restraint so
that the back
of your head is supported at eye level by
the center of the head restraint.
X Observe the safety guidelines on steering
wheel adjustment ( Y page 102).
X Make sure that steering wheel 0043 is
adjusted properly.
Adjusting the steering wheel manually
(Y page 102)
Adjusting the steering wheel electrically
(Y page 102)
When adjusting the steering wheel, make
sure that:
R you can hold the steering wheel with your
arms slightly bent.
R you can move your legs freely.
R you can see all the displays in the
instrument cluster clearly.
X Observe the safety guidelines for seat belts
(Y page 54).
X Check whether you have fastened the seat
belt 0044 properly ( Y page 56).
The seat belt should:
R fit snugly across your body
R be routed across the middle of your
shoulder
R be routed in your
pelvic
area across the hip
joints
X Before starting off, adjust the rear-view
mirror and the exterior mirrors in such a
way that you have a
good view of road and
traffic conditions (Y page 103).
X Vehicles with a memory function: save
the seat, steering wheel and
exterior mirror96
Correct driver's seat position
Seats, steering wheel and mirrors
settings with the memory function
(Y page 106).
Seats
Important safety notes
G
WARNING
The seats can still be adjusted when there is
no key in the ignition lock. For this reason,
children should never be left unsupervised in
the vehicle. They could otherwise become
trapped when adjusting the seat. G
WARNING
Make sure that the back of your head is
supported at eye level by the central area of
the head restraint. If your head is not
supported correctly by the head
restraint, you
could suffer a severe neck injury in the event
of an accident. Never drive if the head
restraints are not engaged and set correctly. G
WARNING
In order to avoid possible loss of vehicle
control, all seat, head restraint, steering
wheel and rear view mirror adjustments, as
well as fastening of seat belts, must be done
before setting the vehicle in motion. G
WARNING
Do not adjust the driver's seat while driving.
Adjusting the seat while driving could cause
the driver to lose control of the vehicle.
Never travel in a moving
vehicle with the seat
backrest in an excessively reclined position as
this can be dangerous. You could slide under
the seat belt in a collision. If you slide under
it, the seat belt would apply force at the
abdomen or neck. This could cause serious or
fatal injuries. The seat backrest and seat belts
provide the best restraint when the wearer is
in a position that is as upright as possible and
seat belts are properly positioned on the
body. G
WARNING
Your seat belt must be adjusted so that you
can correctly fasten your seat belt.
Observe the following points:
R adjust the seat backrest until
your arms are
slightly angled when holding the steering
wheel.
R adjust the seat to a comfortable seating
position that still allows you to reach the
accelerator/brake pedal safely. The
position should be as far back as possible
with the driver still able to operate the
controls properly.
R adjust the head restraint so that it is as
close to the head as possible and the center
of the head restraint supports the back of
the head at eye level.
R never place hands under the seat or near
any moving parts while a seat is being
adjusted.
Failure to do so could result in an accident
and/or serious personal injury. G
WARNING
According to accident statistics, children are
safer when properly restrained on the rear
seats than on the front-passenger
seat. Thus,
we strongly recommend that children be
placed in the rear seat whenever possible.
Regardless of seating position, children 12
years old and under must be seated and
properly secured in an appropriately sized
child restraint system or booster seat
recommended for the size and weight of the
child. For additional information, see the
"Children in the vehicle" section.
A child's risk of serious or fatal injuries is
significantly increased if the child restraints
are not properly secured in the vehicle and/
or the child is not properly secured in the child
restraint. G
WARNING
For your protection, drive only with properly
positioned head restraints. Seats
97
Seats, steering wheel and mirrors
Z
X
Move adjustment lever 0043 in the direction
of the arrow until the desired backrest
contour is achieved. Adjusting the 4-way lumbar support
You can adjust the contour of the front seat
backrests individually to provide optimum
support for your back. 0043
To raise the backrest contour
0044 To soften the backrest contour
0087 To lower the backrest contour
0085 To harden the backrest contour Switching the seat heating on/off
Activating/deactivating G
WARNING
Repeatedly setting the seat heating to level
3 may result in excessive seat temperatures.
The health of passengers that have limited
temperature sensitivity or a limited ability to
react to excessively high temperatures may
be affected or they may even suffer burn-like
injuries. Therefore, do not use seat heating
level 3 repeatedly.
The three red indicator lamps in the button
indicate the heating level you have selected.
i If the battery voltage is too low, the seat
heating may switch off. Driver's and front-passenger seat
The system automatically switches down
from level 3 to level 2 after approximately
eight minutes.
The system automatically switches down
from level
2 to level 1
after approximately ten
minutes.
The system automatically switches off
approximately 20 minutes after it is set to
level 1.
X Make sure that the SmartKey is in position
1 or 2 in the ignition lock.
X To switch on: press button 0043 repeatedly
until the desired heating level is set.
X To switch off: press button 0043 repeatedly
until all the indicator lamps go out.
Problems with the seat heating The seat heating has switched off
prematurely or cannot be switched on. The
vehicle's electrical system voltage is too low
because too many electrical consumers are
switched on.
X
Switch off electrical consumers that you do
not need, such as the rear window
defroster or interior lighting. Seats
101
Seats, steering wheel and mirrors Z