
Safety systemsee Driving safety systems
Seat belts
Adjusting the driver's and front-
passenger seat belt ......................... 59
Adjusting the height ......................... 59
Belt force limiters ............................ 60
center rear-compartment seat ......... 59
Cleaning ......................................... 31 2
Correct usage .................................. 57
Emergency Tensioning Devices ........ 60
Fastening ......................................... 58
Important safety guidelines ............. 56
Releasing ......................................... 59
Safety guidelines ............................. 43
Switching belt adjustment on/off
(on-board computer) ...................... 233
Warning lamp ................................. 260
Warning lamp (function) ................... 60
Seats
Adjusting (electrically) ................... 101
Adjusting lumbar support .............. 104
Adjusting the 4-way lumbar sup-
port ............................................... . 104
Adjusting the head restraint .......... 102
Cleaning the cover ......................... 311
Correct driver's seat position ........ 100
Folding the backrest (rear com-
partment) forwards/back .............. 276
Folding the rear bench seat for-
wards/back ................................... 276
Important safety notes .................. 101
Seat heating problem .................... 106
Storing settings (memory func-
tion) .............................................. . 112
Switching seat heating on/off ....... 105
Sensors (cleaning instructions) ....... 309
Service menu (on-board com-
puter) .................................................. 2 30
Service products
Brake fluid ..................................... 377
Coolant (engine) ............................ 378
DEF special additives ..................... 376
Engine oil ....................................... 377
Fuel ............................................... . 373
Important safety notes .................. 373
Refrigerant (air-conditioning sys-
tem) ............................................... 379Washer fluid ................................... 379
Setting the air distribution ............... 140
Setting the airflow ............................ 141
Settings
Factory (on-board computer) ......... 234
On-board computer ....................... 230
Side impact air bag ............................. 47
Side marker lamp (display mes-
sage) ................................................... 245
Side windows
Cleaning ......................................... 30 8
Convenience closing feature ............ 93
Convenience opening feature .......... 93
Important safety information ........... 91
Opening/closing .............................. 92
Problem (malfunction) ..................... 94
Resetting ......................................... 94
Sliding sunroof
see Panorama roof with power
tilt/sliding panel
SmartKey
Changing the battery ....................... 81
Changing the programming ............. 80
Checking the battery ....................... 81
Convenience closing feature ............ 93
Convenience opening feature .......... 93
Display message ............................ 258
Door central locking/unlocking ....... 78
Important safety notes .................... 78
Loss ................................................. 83
Mechanical key ................................ 80
Positions (ignition lock) ................. 149
Problem (malfunction) ..................... 83
Starting the engine ........................ 151
Snow chains ...................................... 335
Sockets
Center console .............................. 285
General notes ................................ 284
Rear compartment ......................... 285
Special seat belt retractor .................. 64
Specialist workshop ............................ 27
Speed, controlling
see Cruise control
Speedometer
Digital ............................................ 224
In the Instrument cluster ................. 33
Segments ...................................... 221
16Index

RNever 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.
GWARNING
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.
Never attempt to make modifications to seat
belts. This could impair the effectiveness of
the seat belts.
Fastening seat belts
GWARNING
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 prop- erly secured in an appropriately sized child
restraint system or booster seat recommen-
ded 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 sig-
nificantly 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 100).
X Pull the seat belt smoothly through belt
sash guide :.
X Without twisting it, guide the shoulder sec-
tion of the seat belt across the middle of
your shoulder and the lap section across
your pelvis.
X Engage belt tongue ; in buckle =.
Seat-belt adjustment: if necessary, the
driver's and front-passenger seat belts
automatically adjust to the upper body
( Y page 59).
X If necessary, adjust the seat belt to the
appropriate height ( Y page 59).
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 tosecurely fasten child restraint systems in the
vehicle. For further information on special
seat belt retractors, see ( Y page 64).
For more information about releasing the seat
belt with release button ?, see "Releasing
seat belts" ( Y page 59).
58Occupant safety
Safety

Seat belt adjustment
The seat-belt adjustment function adjusts thedriver's and front-passenger seat belt to the
upper body of the occupants.
The belt strap is tightened slightly when:
R the belt tongue is engaged in the buckle
and
R the ignition is switched on
The seat-belt adjustment will apply a retrac-
tion force if any slack is detected between the occupant and the seat belt. Do not hold on tothe seat belt tightly while it is adjusting. You
can switch the seat-belt adjustment on and
off in the on-board computer ( Y page 233).
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 pro-
tection system)" section ( Y page 54).
Belt height adjustment
You can adjust the seat belt height on the
driver's seat and the front-passenger seat.
Adjust the height so that the upper part of the
seat belt is routed across the center of your
shoulder.
X To raise: slide the belt sash guide upwards.
The belt sash guide engages in various posi- tions.
X To lower: press and hold belt sash guide
release :. X
Slide the belt sash guide downwards.
X Release belt sash guide release : and
make sure that the belt sash guide has
engaged.
Using the rear center seat belt
If the left-hand rear seat backrest is folded
down and back up again, the rear center seat
belt may lock. The seat belt can then not be
pulled out.
X To release the rear center seat belt: pull
the seat belt out approximately 1 in
(25 mm) at the belt outlet on the backrest
and then release it again.
The seat belt is retracted and released.
Releasing seat belts
X Press release button ? on belt buckle =.
X Guide belt tongue ; to belt sash guide :.
! Make sure that the seat belt is fully rolled
up. Otherwise, the seat belt or belt tongue
will be trapped in the door or in the seat
mechanism. This could damage the door,
the door trim panel and the seat belt. Dam- aged seat belts can no longer fulfill their
protective function and must be replaced.
Visit a qualified specialist workshop.
Occupant safety59
Safety
Z

settings with the memory function
(Y page 112).
Seats
Important safety notes
GWARNING
Children could become trapped if they adjust
the seats, particularly when unattended.
There is a risk of injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Neverleave children unsupervised in the vehicle.
The seats can still be adjusted when there is
no SmartKey in the ignition lock.
GWARNING
You could lose control of your vehicle if you do the following while driving:
R adjust the driver's seat, head restraint,
steering wheel or mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the engine.
GWARNING
If you adjust the seat height carelessly, you orother vehicle occupants could be trapped and thereby injured. Children in particular could
accidentally press the electrical seat adjust-
ment buttons and become trapped. There is a
risk of injury.
While moving the seats, make sure that your
hands or other body parts do not get under the
lever assembly of the seat adjustment sys-
tem.
GWARNING
When you adjust a seat, you or other vehicle
occupants could become trapped, e.g. on the seat guide rail. There is a risk of injury.
Make sure when adjusting a seat that no onehas any body parts in the sweep of the seat.
Observe the safety notes on "Air bags"
( Y page 44) and "Children in the vehicle" .
! To avoid damage to the seats and the seat
heating, observe the following information:
R keep liquids from spilling on the seats. If
liquid is spilled on the seats, dry them as
soon as possible.
R if the seat covers are damp or wet, do not
switch on the seat heating. The seat
heating should also not be used to dry
the seats.
R clean the seat covers as recommended;
see the "Interior care" section.
R do not transport heavy loads on the
seats. Do not place sharp objects on the
seat cushions, e.g. knives, nails or tools. The seats should only be occupied by
passengers, if possible.
R when the seat heating is in operation, do
not cover the seats with insulating mate-
rials, e.g. blankets, coats, bags, seat cov- ers, child seats or booster seats.
! Make sure that there are no objects in the
footwell under or behind the seats when
moving the seats back. There is a risk that
the seats and/or the objects could be dam- aged.
iThe rear-compartment head restraints
can be removed ( Y page 104).
For more information, contact a qualified
specialist workshop.
iFurther related subjects:
R Cargo compartment enlargement (fold-
ing down the rear bench seat)
(Y page 276)
Adjusting the seats
iVehicles without Memory function: the
seats can be adjusted within three minutes
of a front door being opened.
Seats101
Seats, steering wheel and mirrors
Z

The time period starts over again if, within
these three minutes, you:R open or close a front door
R insert the SmartKey into the ignition lock
or remove it from the ignition lock
R switch the ignition on or off
If the SmartKey is in position 2 in the igni-
tion lock ( Y page 149), the seats can be
adjusted at any time.
Depending on the equipment, the seat adjust-
ment buttons are either located on the side of the seat or on the door control panel.
:Seat cushion angle
;Seat height
=Seat fore-and-aft adjustment
?Backrest angle
:Seat cushion angle
;Seat height
=Seat fore-and-aft adjustment
?Backrest angle
AHead restraint height 4
iYou can store the seat settings using the
memory function ( Y page 112).
Adjusting the head restraints
GWARNING
You could lose control of your vehicle if you do
the following while driving:
R adjust the driver's seat, head restraint,
steering wheel or mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the engine.
GWARNING
If head restraints are not installed and adjus-
ted correctly, they cannot provide protection
as intended. There is an increased risk of
injury in the head and neck area, e.g. in the
event of an accident or when braking.
Always drive with the head restraints instal-
led. Before driving off, make sure for every
vehicle occupant that the center of the head
restraint supports the back of the head at
about eye level.
Do not rotate the head restraints of the front and rear seats. Otherwise, you cannot adjust
the height and angle of the head restraints to
the correct position.
Using the fore-and-aft adjustment, adjust the head restraint so that it is as close as possible to your head.
Pay attention to the important safety notes
( Y page 101).
4
For vehicles with memory function only.
102Seats
Seats, steering wheel and mirrors

Adjusting the head restraints manually
Adjusting the head restraint height5
X
To raise: pull the head restraint up to the
desired position.
X To lower: press release catch : in the
direction of the arrow and push the head
restraint down to the desired position.
Adjusting the angle of the head restraints
X Push or pull the lower edge of the head
restraint in the direction of the arrow.
Adjusting the height of the head
restraints electrically
X To adjust the head restraint height: slide
the switch for head restraint adjustment
( Y page 101) up or down in the direction of
the arrow.
Adjusting the luxury head restraints
X To adjust the side bolsters of the head
restraint: push or pull right and/or left-
hand side bolster : into the desired posi-
tion.
X To adjust the angle of the head
restraint: push or pull the head restraint in
the direction of arrow ;.
iAdjust the head restraint so that the back
of your head is as close to the head
restraint as possible.
Rear seat head restraints
Adjusting the rear seat head restraint
height
Once the head restraint is fully lowered, press release catch :.
X To raise: pull the head restraint up to the
desired position.
5 For vehicles without memory function only.
Seats103
Seats, steering wheel and mirrors
Z

Problems with the seat heating
ProblemPossible causes/consequences and M Solutions
The seat heating has
switched off prema-
turely or cannot be
switched on.The on-board voltage is too low because too many elect rical con-
sumers are switched on.
X Switch off electrical consumers that you do not need, such as
the rear window defroster or interior lighting.
Steering wheel
Important safety notes
GWARNING
You could lose control of your vehicle if you do
the following while driving:
R adjust the driver's seat, head restraint,
steering wheel or mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the engine.
GWARNING
If the steering wheel is unlocked while the
vehicle is in motion, it could change position
unexpectedly. This could cause you to lose
control of the vehicle. There is a risk of an
accident.
Before starting off, make sure the steering
wheel is locked. Never unlock the steering
wheel while the vehicle is in motion.
GWARNING
Children could injure themselves if they
adjust the steering wheel. There is a risk of
injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Neverleave children unsupervised in the vehicle.
The electrically adjustable steering wheel can
still be adjusted when there is no SmartKey in
the ignition lock.
Adjusting the steering wheel man-
ually
GWARNING
If the steering wheel is unlocked while the
vehicle is in motion, it could change position
unexpectedly. This could cause you to lose
control of the vehicle. There is a risk of an
accident.
Before starting off, make sure the steering
wheel is locked. Never unlock the steering
wheel while the vehicle is in motion.
:Release lever
;To adjust the steering wheel height
=To adjust the steering wheel position
(fore-and-aft adjustment)
X Push release lever : down completely.
The steering column is unlocked.
X Adjust the steering wheel to the desired
position.
X Push release lever : up completely.
The steering column is locked.
X Check if the steering column is locked.
When doing so, try to push the steering
106Steering wheel
Seats, steering wheel and mirrors

wheel up or down or try to move it in the
fore-and-aft direction.
Adjusting the steering wheel electri-
cally
:To adjust the steering wheel height
;To adjust the steering wheel position
(fore-and-aft adjustment)
The steering wheel can also be adjusted when the SmartKey is removed from the ignition
lock.
iFurther related subjects:
R EASY-ENTRY/EXIT feature
(Y page 108)
R Storing settings ( Y page 112)
Steering wheel heating
Switching on/off
X Turn the SmartKey to position 2 in the igni-
tion lock ( Y page 149).
X To switch on/off: turn the lever in the
direction of arrow : or ;.
Indicator lamp = lights up or goes out.
Vehicles without KEYLESS-GO: when you
remove the SmartKey from the ignition lock,
the steering wheel heating is deactivated.
Vehicles with KEYLESS-GO: when you switch
off the ignition and open the driver's door, the steering wheel heating is deactivated.
iThe steering wheel heating may switch off
temporarily if:
R the temperature in the vehicle interior is
above 86 ‡ (30 †)
R the temperature of the steering wheel is
above 95 ‡ (35 †).
Indicator lamp = remains on.
Steering wheel107
Seats, steering wheel and mirrors
Z