ignition MERCEDES-BENZ C-CLASS SALOON 2014 Owner's Manual

Problem
Possible causes/consequences and
M
MSolutions The engine cannot be
started using the key. 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 416).
or
X Jump-start the vehicle (Y page 418).
or
X Consult a qualified specialist workshop. The engine cannot be
started using the Start/
Stop button. The key is
in the vehicle. The vehicle is locked.
X Unlock the vehicle and try to start the vehicle again. The key battery is discharged or nearly discharged.
X Check the key battery (Y page 94) and replace it if necessary
(Y page 94).
If this does not work: X Start your vehicle with the key in the ignition lock. There is interference from a powerful source of radio waves.
X Start your vehicle with the key in the ignition lock. You have lost a key. X
Have the key 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 emer-
gency key element. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. Doors
Important safety notes
United Kingdom only: G
WARNING
When the double locks are activated, the
doors can no longer be opened from the
inside. People in the vehicle can no longer get out, e.g. in hazardous situations. There is a
risk of injury. Therefore, do not leave any people unsuper-
vised in the vehicle, particularly children, eld- erly people or people in need of special assis-
tance. Do not activate the double lock when
people are in the vehicle.
If the vehicle has been locked from the out-
side, the double-lock function is activated as
standard. It is then not possible to open the
doors from inside the vehicle. You can deac-
tivate the double lock function by deactivat-
ing the interior motion sensor (Y page 86).96
DoorsOpening and closing

X
To unlock: press button :.
X To lock: press button ;.
If the front-passenger door is closed, the
vehicle locks.
This does not lock or unlock the fuel filler flap. You cannot unlock the vehicle centrally from
the inside if the vehicle has been locked with
the key or KEYLESS-GO.
For all countries except the United King-
dom:
The doors can be opened from the inside. You can only open the rear doors from inside the
vehicle if they are not secured by the child-
proof locks (Y page 73).
If the vehicle has previously been locked with the key or with KEYLESS-GO, opening a door
from the inside will trigger the anti-theft alarm system. Switch off the alarm (Y page 85).
United Kingdom only: if the vehicle has
been locked with the key or with KEYLESS-
GO, the double lock function is activated as
standard. It is then not possible to open the
doors from inside the vehicle. You can deac-
tivate the double lock function by deactivat-
ing the interior motion sensor (Y page 86). It
is then possible to operate the doors as fol-
lows. The doors can be opened from the
inside. You can only open the rear doors from
inside the vehicle if they are not secured by
the child-proof locks (Y page 73).
When a locked door is opened from inside the vehicle, the previous unlocking process will
be observed if the vehicle has been:
R locked with the locking button for the cen-
tral locking or
R locked automatically
The vehicle will be fully unlocked if it had pre- viously been fully unlocked. Only the door
which has been opened form the inside is
unlocked if only the driver's door had been
previously unlocked. Automatic locking feature
X
To deactivate: press and hold button :
for approximately five seconds until a tone sounds.
X To activate: press and hold button ;for
approximately five seconds until a tone
sounds.
If you press one of the two buttons and do not hear a tone, the relevant setting has already
been selected.
The vehicle is locked automatically when the
ignition is switched on and the wheels are
turning.
Therefore, you could be locked out if:
R the vehicle is being pushed.
R the vehicle is being towed.
R the vehicle is being tested on a dynamom-
eter.
i You can also activate and deactivate the
automatic locking function via COMAND
Online or Audio 20 (see the separate oper-
ating instructions). Unlocking the driver's door (emer-
gency key element)
If the vehicle can no longer be locked or
unlocked with the key or KEYLESS-GO, use
the emergency key element.
X Take the emergency key element out of the
key (Y page 93).
Vehicles with KEYLESS-GO: 98
DoorsOpening and closing

:
Front left
; Front right
= Rear right
? Rear left
X Turn the key to position 1or 2in the ignition
lock (Y page 181).
X To open manually: press and hold the cor-
responding button.
X To open fully: press the button beyond the
point of resistance and release it.
Automatic operation is started.
X To close manually: pull the corresponding
button and hold it.
X To close fully: pull the button beyond the
point of resistance and release it.
Automatic operation is started.
X To interrupt automatic operation:
press/pull the corresponding switch again.
If you press/pull the switch beyond the point
of resistance and release, automatic opera-
tion is started in the corresponding direction. You can stop automatic operation by press-
ing/pulling again.
You can continue to operate the side windowsafter switching off the engine or removing the
key. This function remains active for five
minutes or until you open a front door.
The side windows cannot be operated from
the rear when the override feature for the side
windows is activated (Y page 73).
i Information on opening and closing the
roller sunblinds on the rear side windows
(Y page 378). Convenience opening feature
General notes Vehicles with KEYLESS-GO or KEYLESS-
GO start function: you can ventilate the vehi-
cle before you start driving.
If the key is in the immediate vicinity to the
vehicle, the convenience opening function is
available.
To do this, the key is used to carry out the
following functions simultaneously:
R unlock the vehicle
R open the side windows
R open the sliding sunroof or the panorama
sliding sunroof and the roller sunblind
R switch on the seat ventilation for the driv-
er's seat
Convenience opening feature X
Press and hold the %button until the
side windows and the sliding sunroof or the panorama sliding sunroof are in the desired
position.
If the roller sunblinds of the panorama slid- ing sunroof are closed, the roller sunblinds
are opened first.
X Press and hold the %button again until
the panorama sliding sunroof is in the
desired position.
X To interrupt convenience opening:
release the %button. Convenience closing feature
Important safety notes G
WARNING
When the convenience closing feature is oper- ating, parts of the body could become trapped
in the closing area of the side window and the
sliding sunroof. There is a risk of injury.
Observe the complete closing procedure
when the convenience closing feature is oper- Side windows
107Opening and closing
Z

ating. When closing make sure that no parts of
the body are in the closing area.
Vehicles with KEYLESS-GO or KEYLESS-
GO start function: if the key is in the imme-
diate vicinity to the vehicle, the convenience
closing function is available.
When you lock the vehicle, you can simulta-
neously:
R close the side windows
R close the sliding sunroof or the panorama
sliding sunroof
On vehicles with a panorama sliding sunroof, you can then close the roller sunblinds.
Notes on the automatic reversing feature for:
R the side windows (Y page 106)
R the sliding sunroof or the panorama sliding
sunroof (Y page 111)
Using the key X
Press and hold the &button until the
side windows and the sliding sunroof or the
panorama sliding sunroof are fully closed.
X Make sure that all the side windows and the
sliding sunroof or panorama sliding sunroof
are closed.
X Vehicles with panorama sliding sun-
roof: press and hold the &button until
the roller sunblinds of the panorama sliding
sunroof close.
X To interrupt convenience closing:
release the &button.
Using KEYLESS-GO The driver's door and the door at which the
handle is used, must both be closed. The key
must be outside the vehicle. The gap between
the key and the corresponding door handle
should not be greater than 1 m. X
Touch recessed sensor surface :on the
door handle until the side windows and the sliding sunroof or the panorama sliding
sunroof are fully closed.
Make sure you only touch recessed sensor surface :.
X Make sure that all the side windows and the
sliding sunroof or panorama sliding sunroof
are closed.
X Vehicles with panorama sliding sun-
roof: touch recessed sensor surface :on
the door handle again until the roller sun-
blinds of the panorama sliding sunroof
close.
X To interrupt convenience closing:
release recessed sensor surface :on the
door handle. Resetting the side windows
If a side window can no longer be closed fully, you must reset it.
X Close all doors.
X Turn the key to position 1or 2in the ignition
lock (Y page 181).
X Pull the corresponding switch on the door
control panel until the side window is com- pletely closed (Y page 106).
X Hold the switch for an additional second. 108
Side windowsOpening and closing

!
Only open the panorama sliding sunroof if
it is free of snow and ice. Otherwise, mal-
functions may occur.
Do not allow anything to protrude from the sliding sunroof. Otherwise, the seals could
be damaged.
Resonance noises can occur in addition to the
usual airflow noises when the sliding sunroof is open. They are caused by minor pressure
fluctuations in the vehicle interior. Change
the position of the sliding sunroof or open a
side window slightly to reduce or eliminate
these noises.
Only for vehicles with panorama sliding
sunroof: G
WARNING
At high speeds the raised sliding sunroof auto- matically lowers slightly at the rear. This could
trap you or other persons. There is a risk of
injury. Make sure that nobody reaches into
the sweep of the sliding sunroof whilst the
vehicle is in motion.
If somebody becomes trapped, immediately
pull back the sliding sunroof switch. The slid- ing sunroof lifts during opening. Sliding sunroof reversing feature
Your vehicle may be fitted with a sliding sun-
roof or a panorama sliding sunroof. In this
section, the term "sliding sunroof" refers to
both types of sliding sunroof.
The sliding sunroof is equipped with an auto- matic reversing feature. If an object blocks or
restricts the sliding sunroof during the closing process, the sliding sunroof opens again
automatically. The automatic reversing fea-
ture is only an aid and is no substitute for your
attention when closing the sliding roof. G
WARNING
The reversing function does not react:
R to soft, light and thin objects, e.g. small fin-
gers
R over the last 4 mm of the closing movement R
during resetting
R when closing the sliding sunroof again man-
ually immediately after automatic reversing
This means that the reversing function cannot prevent someone being trapped in these sit-
uations. There is a risk of injury.
When closing make sure that no parts of the
body are in the closing area.
If someone is trapped:
R release the switch immediately or
R during automatic operation, press the
switch briefly in any direction
The closing process is stopped. Operating the sliding sunroof
Opening and closing Overhead control panel
:
To raise
; To open
= To close/lower
X Turn the key to position 1or 2in the ignition
lock (Y page 181).
X Press or pull the 3switch in the corre-
sponding direction.
If you press or pull the 3switch beyond
the point of resistance, automatic operation
is started in the corresponding direction. You can stop automatic operation by pressing or
pulling again.
The sun protection cover automatically opens
along with the sliding sunroof. You can open Sliding sunroof
111Opening and closing Z

or close the sun protection cover manually
when the sliding sunroof is raised or closed.
You can continue to operate the sliding sun-
roof after switching off the engine or remov-
ing the key. This function remains active for
five minutes or until the driver's or front-
passenger door is opened.
Rain-closing feature When the key is in position
0in the ignition
lock or is removed, the sliding sunroof closes
automatically:
R if it starts to rain.
R at extreme outside temperatures.
R after six hours.
R if there is a malfunction in the power sup-
ply.
The rear of the sliding sunroof is then raised in order to ventilate the vehicle interior.
If the sliding sunroof is obstructed when
being closed by the rain-closing feature, it
opens again slightly. The rain-closing feature
is then deactivated.
The sliding sunroof does not close if:
R it is raised at the rear.
R it is blocked.
R no rain is falling on the area of the wind-
screen being monitored by the rain sensor,
e.g. because the vehicle is under a bridge.
Resetting !
If the sliding sunroof still cannot be
opened or closed fully after resetting, con- tact a qualified specialist workshop.
Reset the sliding sunroof if it does not operate
smoothly.
X Turn the key to position 1or 2in the ignition
lock.
X Raise the sliding sunroof fully at the rear
(Y page 111).
X Keep the 3switch pressed for another
second. X
Make sure that the sliding sunroof can be
fully opened and closed again
(Y page 111).
X If this is not the case, repeat the steps
above again. Operating the panorama sliding sun-
roof
Opening and closing Overhead control panel
:
To raise
; To open
= To close/lower
The panorama sliding sunroof can only be
operated when the roller sunblind is open.
X Turn the key to position 1or 2in the ignition
lock (Y page 181).
X Press or pull the 3switch in the corre-
sponding direction.
If you press or pull the 3switch beyond
the point of resistance, automatic operation
is started in the corresponding direction. You can stop automatic operation by pressing or
pulling again.
If the panorama sliding sunroof is raised at
the rear, it automatically lowers slightly at
higher speeds. The noise level in the vehicle
interior is reduced as a result. At low speeds it
raises again automatically.
You can continue to operate the panorama
sliding sunroof after switching off the engine
or removing the key. This function remains 112
Sliding sunroofOpening and closing

active for five minutes or until you open a
front door.
The panorama sliding sunroof cannot be
opened if a roof carrier is fitted. In order to
allow ventilation of the vehicle interior, you
can raise the panorama sliding sunroof. If a
roof carrier approved by Mercedes-Benz
makes contact with the panorama sliding
sunroof, the sunroof will lower slightly but
remain raised at the rear.
Rain-closing feature when the engine is
switched off If the key is in position
0in the ignition lock or
if it is removed, the panorama sliding sunroof
closes automatically:
R if it starts to rain.
R at extreme outside temperatures.
R after six hours.
R if there is a malfunction in the power sup-
ply.
The panorama sliding sunroof remains raised
at the rear in order to allow ventilation of the vehicle interior.
If the panorama sliding sunroof is obstructed
when being closed by the rain-closing feature,
it opens again slightly. The rain-closing fea-
ture is then deactivated.
The panorama sliding sunroof does not close if:
R it is raised at the rear.
R it is blocked.
R no rain is falling on the area of the wind-
screen being monitored by the rain sensor. If the vehicle, for example, is under a bridge
or in a carport, the field of the sensor may
be covered.
Rain-closing feature when driving The raised sliding sunroof automatically low-
ers at the rear when driving if it starts to rain.
The sliding sunroof is lowered depending on:
R the road speed and
R the intensity of the rain You can manually cancel the automatic clos-
ing procedure. Press or pull the
3switch
in any direction.
To raise the sliding sunroof again, press the
3 switch in direction :.
The "Rain-closing feature when driving" func-
tion is deactivated, until you:
R press or pull the 3switch in any direc-
tion or
R turn the key to another position in the igni-
tion lock (Y page 181). Operating the panorama sliding sun-
roof roller sunblinds
Important safety notes G
WARNING
When opening or closing the roller sunblind
parts of the body could be trapped between
the roller sunblind and the frame or sliding
sunroof. There is a risk of injury.
When opening or closing make sure that no
parts of the body are in the sweep of the roller sunblind.
If someone is trapped:
R release the switch immediately or
R during automatic operation, press the
switch briefly in any direction
The opening/closing process is stopped.
The roller sunblinds shield the vehicle interior from sunlight. The front roller sunblind can
only be opened and closed when the sliding
sunroof is closed.
Roller sunblinds reversing feature The roller sunblinds are equipped with an
automatic reversing feature. If a solid object
blocks or restricts the roller blind during the
closing process, the roller blind opens again
automatically. However, the automatic
reversing feature is only an aid, not a substi-
tute for your attention when closing the roller
sunblind. Sliding sunroof
113Opening and closing Z

G
WARNING
The reversing feature especially does not
react to soft, light and thin objects, such as
small fingers. This means that the reversing
feature cannot prevent someone being trap-
ped in these situations. There is a risk of
injury.
When closing make sure that no parts of the
body are in the sweep of the roller sunblind.
If someone is trapped:
R release the switch immediately or
R during automatic operation, press the
switch briefly in any direction
The closing process is stopped.
Opening and closing roller sunblinds Overhead control panel
:
To open
; To open
= To close
You can only close the roller sunblinds when
the panorama sliding sunroof is closed.
X Turn the key to position 1or 2in the ignition
lock (Y page 181).
X Press the 3switch in direction :.
Both roller sunblinds open, then the sliding
roof is raised.
X Pull the 3switch in direction ;.
The sunblinds open
X Pull the 3switch in direction =.
The roller sunblinds close when the pano-
rama sliding roof is closed. If you press or pull the
3switch beyond
the point of resistance, automatic operation
is started in the corresponding direction. You
can stop automatic operation by pressing or
pulling again. Resetting the panorama sliding sun-
roof or the front roller sunblind
Reset the panorama sliding sunroof or the
front roller sunblind if the panorama sliding
sunroof or the roller sunblinds does not move smoothly.
X Turn the key to position 1or 2in the ignition
lock (Y page 181).
X Pull the 3switch repeatedly to the point
of resistance in the direction of arrow :
until the panorama sliding sunroof is fully
closed.
X Keep the 3switch pulled for an addi-
tional second.
X Pull the 3switch in the direction of
arrow :repeatedly until the front roller
sunblind is closed.
X Keep the 3switch pulled for an addi-
tional second.
X Make sure that the panorama sliding sun-
roof (Y page 112) and the front roller sun-
blind (Y page 114) can be fully opened
again.
X If this is not the case, repeat the steps
above again. 114
Sliding sunroofOpening and closing

The seat belt should:
R fit snugly across your body
R be routed across the middle of your shoul-
der
R be routed across your hips in the pelvic
area
X Before starting off, adjust the rear-view mir-
ror and the exterior mirrors so that you
have a good view of the road and traffic
conditions (Y page 128).
X Vehicles with memory function: you can
store the seat, steering wheel, exterior mir-
ror and head-up display settings with the
memory function (Y page 131). Seats
Important safety notes
G
WARNING
If children adjust the seats, they could
become trapped, especially if they are unat-
tended. There is a risk of injury.
When leaving the vehicle, always take the key with you and lock the vehicle. Never leave
children unattended in the vehicle.
The seats can still be adjusted when there is
no key in the ignition lock. G
WARNING
When adjusting a seat, you or another vehicle occupant could become trapped by the guiderail of the seat, for instance. There is a risk of
injury.
Make sure that no one has any part of their
body within the sweep of the seat when
adjusting it.
Observe the safety notes on "Airbags"
(Y page 51) and "Children in the Vehicle"
(Y page 63). G
WARNING
If the driver's seat is not engaged, it can move unexpectedly while the vehicle is in motion. This could cause you to lose control of the
vehicle. There is a risk of an accident.
Always make sure that the driver's seat is
engaged before starting the engine.
G
WARNING
You could lose control of the vehicle while
driving if you:
R adjust the driver's seat, 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 mirrors 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 andthereby 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. G
WARNING
The head restraints cannot provide the inten-
ded protection unless they are fitted and
adjusted correctly. There is an increased risk of injury to the head and neck in the event of
an accident or sudden braking, for example.
Always drive with the head restraints fitted.
Ensure that the centre of the head restraints
support the back of each vehicle occupant's
head at eye level before driving off. G
WARNING
The seat belt does not offer the intended level of protection if you have not moved the back-
rest to an almost vertical position. When brak-
ing or in the event of an accident, you could
slide underneath the seat belt and sustain Seats
119Seats, steering wheel and mirrors
Z

X
Release the rear seat backrest and fold it
slightly forwards (Y page 372).
X To remove: pull the head restraint up to
the stop.
X Press release catch :and pull the head
restraint out of the guides.
X To refit: insert the head restraint so that
the notches on the bar are on the left when
viewed in the direction of travel.
X Push the head restraint down until you hear
it engage in position.
X Fold back the rear seat backrest until it
engages. Adjusting the 4-way lumbar support
:
To raise the backrest contour
; To soften the backrest contour
= To lower the backrest contour
? To harden the backrest contour
You can adjust the contour of the front seat
backrests individually to provide optimum
support for your back. Switching the seat heating on/off
Activating/deactivating G
WARNING
If you repeatedly switch on seat heating, the
seat cushion and backrest padding may
become very hot. The health of vehicle occu-
pants with limited temperature sensitivity or a limited ability to react to excessively high temperatures may be affected or they may
even suffer burn-like injuries. There is a risk of
injury.
Therefore, do not switch on the seat heating
repeatedly. The three red indicator lamps in the button
indicate the heating level you have selected.
The system automatically switches from level
3 to level 2after approximately eight
minutes.
The system automatically switches from level 2 to level 1after approximately ten minutes.
The system automatically switches off
approximately 20 minutes after it is set to
level 1.
X Turn the key to position 1or 2in the ignition
lock (Y page 181).
X To switch on: press button:repeatedly
until the desired heating level is set.
X To switch off: press button:repeatedly
until all the indicator lamps go out.
i If the battery voltage is too low, the seat
heating may switch off.
i If drive program Eis selected, the power
of the seat heating is reduced.
R Manual transmission (Y page 192)
R Automatic transmission (Y page 197) Seats
123Seats, ste ering wheel and mirrors Z