Problem Possible causes/consequences and
0050
0050Solutions The engine cannot be
started using the
SmartKey. The on-board voltage is too low.
X
Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
X Check the starter battery and charge it if necessary
(Y page 371).
or
X Jump-start the vehicle (Y page 373).
or
X Consult a qualified specialist workshop. The engine cannot be
started using the Start/
Stop button. The
SmartKey is in the
vehicle. The vehicle is locked.
X
Unlock the vehicle and try to start the vehicle again. There is interference from a powerful source of radio waves.
X
Start your vehicle with the SmartKey in the ignition lock. You have lost a
SmartKey. X
Have the SmartKey deactivated at a qualified specialist
workshop.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. Doors
Important safety notes
G
WARNING
If children are left unsupervised in the vehicle,
they could:
R open the doors, thus endangering other
people or road users.
R get out and disrupt traffic.
R operate the vehicle's equipment. Additionally, children could set the vehicle in
motion if, for example, they:
R
release the parking brake.
R shifting the automatic transmission out of
park position P
R Start the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children. G
WARNING
If persons, particularly children are subjected
to prolonged exposure to extreme heat or 90
DoorsOpening and closing
close. Repeat the leg movement more
quickly if this occurs.
To stop the opening or closing procedure:
R move your foot in the sensor detection
range under the bumper or
R pull the handle on the outside of the trunk
lid or
R press the closing button in the trunk lid or
R press the 0054button on the SmartKey
If the trunk lid closing procedure has been
stopped:
R move your foot under the bumper again and
the trunk lid will open.
If the trunk lid opening procedure has been
stopped:
R move your foot under the bumper again and
the trunk lid will close. Opening/closing automatically from
inside
Important safety notes G
WARNING
Parts of the body could become trapped
during automatic closing of the trunk lid.
Moreover, people, e.g. children, may be
standing in the closing area or may enter the
closing area during the closing process. There
is a risk of injury.
Make sure that nobody is in the vicinity of the
closing area during the closing process.
Use one of the following options to stop the
closing process:
R Press the 0054button on the key.
R press the remote operating switch on the
driver's door.
R Press the closing or locking button on the
trunk lid.
R Pull the trunk lid handle. G
WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the
trunk lid is open when the engine is running,
especially if the vehicle is in motion. There is
a risk of poisoning.
Always switch off the engine before opening
the trunk lid. Never drive with the trunk lid
open.
! The trunk lid swings upwards when
opened. Therefore, make sure that there is
sufficient clearance above the trunk lid.
i The opening dimensions of the trunk lid
can be found in the "Vehicle data" section
(Y page 429).
Opening and closing You can open and close the trunk lid from the
driver's seat when the vehicle is stationary
and unlocked.
X
To open: pull remote operating switch for
trunk lid 0043until the trunk lid opens.
X To close: press remote operating switch
for trunk lid 0043until the trunk lid is
completely closed. Locking the trunk separately
You can lock the trunk separately. If you then
unlock the vehicle centrally, the trunk
remains locked and cannot be opened. Trunk
97Opening and closing Z
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 131).
X Vehicles with a memory function: save
the seat, steering wheel and exterior mirror
settings with the memory function
(Y page 133). Seats
Important safety notes
G
WARNING
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. Never
leave children unsupervised in the vehicle. G
WARNING
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,
steering wheel and mirror and fasten your
seat belt before starting the engine. G
WARNING
If you adjust the seat height carelessly, you or
other vehicle occupants could be trapped and
thereby injured. Children in particular could
accidentally press the electrical seat
adjustment 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
system. G
WARNING
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 one
has any body parts in the sweep of the seat. G
WARNING
If head restraints are not installed and
adjusted 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
installed. 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. G
WARNING
The seat belt does not offer the intended level
of protection if you have not moved the
backrest to an almost vertical position. When
braking or in the event of an accident, you
could slide underneath the seat belt and
sustain abdomen or neck injuries, for
example. This poses an increased risk of
injury or even fatal injury.
Adjust the seat properly before beginning
your journey. Always ensure that the backrest
is in an almost vertical position and that the
shoulder section of your seat belt is routed
across the center of your shoulder.
! 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 "Interior care". Seats
111Seats, steering wheel and mirrors Z
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
materials, e.g. blankets, coats, bags,
seat covers, child seats or booster seats.
! 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. Adjusting the seats
Vehicles with standard head restraints
or luxury head restraints 0043
Head restraint height
0044 Head restraint height
0087 Seat height
0085 Seat cushion angle
0083 seat cushion length
0084 Seat fore-and-aft adjustment
006B Backrest angle
i If PRE-SAFE ®
is triggered, the front-
passenger seat will be moved to a better
position if it was previously in an
unfavorable position (Y page 78).
i You can store the seat settings using the
memory function (Y page 133). i
To ensure the largest possible range of
seat settings, certain seat adjustment
functions will automatically activate other
seat adjustment functions.
i The head restraint height is adjusted
automatically when you adjust the seat
height or the seat fore-and-aft position.
Vehicles with an EASY ADJUST luxury
head restraint 0043
Head restraint height
0044 Head restraint fore-and-aft position
0087 Seat height
0085 Seat cushion angle
0083 seat cushion length
0084 Seat fore-and-aft adjustment
006B Backrest angle
i If PRE-SAFE ®
is triggered, the front-
passenger seat will be moved to a better
position if it was previously in an
unfavorable position (Y page 78).
i You can store the seat settings using the
memory function (Y page 133).
i To ensure the largest possible range of
seat settings, certain seat adjustment
functions will automatically activate other
seat adjustment functions.
i The head restraint height is adjusted
automatically when you adjust the seat
height or the seat fore-and-aft position. 112
SeatsSeats, steering wheel and mirrors
You can exit the reclined position and
adjust the seat position by:
R calling up a stored position using
memory buttons 1or 2(Y page 134)
R manually adjusting the seat to the
desired position ( Ypage 112).
i The steps for setting the reclined position
are not always carried out simultaneously.
The legrest folds down if overloaded. If this is
the case fold up the legrest and engage it. Adjusting the front-passenger seat
from the driver’s seat
Important safety notes G
WARNING
The front-air bags for could also injure the
vehicle occupants in the front If the front
seats are positioned too close to the
dashboard or steering wheel. This poses an
increased risk of injury or even fatal injury.
Always adjust the front seats so that they are
as far from the front air bags as possible. Also
observe the notes on the correct adjustment
of the seats. G
WARNING
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. Never
leave children unsupervised in the vehicle. G
WARNING
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 one
has any body parts in the sweep of the seat.
! Do not move the front-passenger seat
fully forwards if there are objects in the parcel net in the front-passenger footwell.
The objects could otherwise be damaged.
Adjusting the front-passenger seat X
To select the front-passenger seat:
press button 0043repeatedly until the
indicator lamp in the button lights up.
When the indicator lamp in button 0043lights
up, for the front-passenger seat you can
adjust:
R adjust the seat (Y page 112)
R seat heating/ventilation
R the memory function to call up or save
settings (Y page 133). Adjusting the front-passenger seat
from the rear
Important safety notes G
WARNING
The front-air bags for could also injure the
vehicle occupants in the front If the front
seats are positioned too close to the
dashboard or steering wheel. This poses an
increased risk of injury or even fatal injury.
Always adjust the front seats so that they are
as far from the front air bags as possible. Also
observe the notes on the correct adjustment
of the seats. 114
SeatsSeats, steering wheel and mirrors
G
WARNING
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. Never
leave children unsupervised in the vehicle. G
WARNING
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 one
has any body parts in the sweep of the seat.
! Do not move the front-passenger seat
fully forwards if there are objects in the
parcel net in the front-passenger footwell.
The objects could otherwise be damaged.
i You can use the rear-compartment
override button to disable the setting of the
front-passenger seat from the rear
(Y page 69).
Adjusting the rear seat 0043
Selects rear-compartment seat
0044 Head restraint height
0087 Head restraint fore-and-aft position
0085 Backrest angle
0083 Combined seat cushion angle and length
0084 Combined seat cushion angle and length X
To select the rear seat: press button0043
repeatedly until the indicator lamp in the
button is not lit.
The rear-compartment seat is selected if
the indicator lamp in the button is not lit.
X Adjust the rear seats with buttons 0044to
0084.
Adjusting the front-passenger seat 0043
Selects the front-passenger seat
0044 Head restraint height
0087 Backrest angle
0085 Seat height
0083 Seat fore-and-aft adjustment
X To select the front-passenger seat:
press button 0043repeatedly until the
indicator lamp in the button lights up.
The front-passenger seat is selected if the
indicator lamp in the button lights up.
X Adjust the front-passenger seat with
buttons 0044to0083. Seats
115Seats, steering wheel and mirrors Z
Problems with the seat ventilation
Problem Possible causes/consequences and
0050
0050Solutions The seat ventilation has
switched off
prematurely or cannot
be switched on. The on-board 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.
Once the battery is sufficiently charged, the seat ventilation can
be switched back on. Steering wheel
Important safety notes
G
WARNING
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,
steering wheel and mirror and fasten your
seat belt before starting the engine. G
WARNING
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. Never
leave children unsupervised in the vehicle. Adjusting the steering wheel
0043
To adjust the steering wheel position
(fore-and-aft adjustment)
0044 To adjust the steering wheel height
i Further related subjects:
R EASY-ENTRY/EXIT feature
(Y page 129)
R Storing settings (Y page 133)
R Operating the on-board computer
(Y page 249). Steering wheel
127Seats, steering wheel and mirrors Z
Problems with the steering wheel heating
Problem Possible causes/consequences and
0050
0050Solutions The steering wheel
heating has switched
off prematurely or
cannot be switched on. The on-board 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. EASY-ENTRY/EXIT feature
Important safety notes G
WARNING
When the EASY-ENTRY/EXIT feature adjusts
the steering wheel and the driver's seat, you
and other vehicle occupants – particularly
children – could become trapped. There is a
risk of injury.
While the EASY-ENTRY/EXIT feature is
making adjustments, make sure that no one
has any body parts in the sweep of the seat
and the steering wheel.
If there is a danger of entrapment by the
steering column:
R move the steering wheel adjustment lever.
If there is a danger of entrapment by the seat:
R press the switch for seat adjustment.
The adjustment process is stopped. G
WARNING
If children activate the EASY-ENTRY/EXIT
feature, they can become trapped,
particularly when unattended. There is a risk
of injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle. G
WARNING
If you drive off while the EASY-ENTRY/EXIT
feature is making adjustments, you could lose
control of the vehicle. There is a risk of an
accident. Always wait until the adjustment process is
complete before driving off.
The EASY-ENTRY/EXIT feature makes getting
in and out of your vehicle easier.
You can activate and deactivate the EASY-
ENTRY/EXIT feature using COMAND (see the
separate operating instructions).
Position of the steering wheel and the
driver's seat when the EASY-ENTRY/
EXIT feature is active The steering wheel tilts upwards and the
driver's seat moves backwards if you:
R
remove the SmartKey from the ignition lock
R with KEYLESS-GO: open the driver's door;
KEYLESS-GO must be in position 1
R with the SmartKey: open the driver's
door; the SmartKey must be in position 0
or 1in the ignition lock (Y page 171)
R open the driver's door when the ignition is
switched off
i The steering wheel only tilts upwards and
the driver's seat only moves backwards, if
this driving position is stored after seat or
steering wheel adjustment (Y page 133).
The last position of the steering wheel or seat
is stored if:
R the ignition is switched off.
R the setting is stored with the memory
function (Y page 133).
i The steering wheel only moves upwards if
it has not already reached the upper end
stop. The driver's seat only moves Steering wheel
129Seats, steering wheel and mirrors Z