2011 MERCEDES-BENZ C-CLASS COUPE keyless

Problems with the key
Problem Possible causes/consequences and
M Solutions
You cannot lock or
unlock the vehicle
using the key. The key battery is discharged or nearly discharged.
X
Try again to lock/unlock the vehicle using the remote control
function of the key. Point the tip of the key at the driver's door
handle from close range and press the %/&button.
If this does not work:
X Check the key battery and replace it if necessary (Y page 81).
X Lock (Y page 85) or unlock (Y page 85) the vehicle using
the emergency key element. The key is faulty.
X
Lock (Y page 85) or unlock (Y page 85) the vehicle using
the emergency key element.
X Have the key checked at a qualified specialist workshop. You can no longer lock
or unlock the vehicle
using KEYLESS-GO. There is interference from a powerful source of radio waves.
X
Lock/unlock the vehicle using the remote control function of
the key. Point the tip of the key at the driver's door handle from
close range and press the %/&button. There is a fault with KEYLESS-GO.
X
Lock/unlock the vehicle using the remote control function of
the key. Point the tip of the key at the driver's door handle from
close range and press the %/&button.
X Have KEYLESS-GO checked at a qualified specialist workshop.
If this does not work:
X Check the key battery and replace it if necessary (Y page 81).
X Lock (Y page 85) or unlock (Y page 85) the vehicle using
the emergency key element. You have lost a key. X
Have the key cancelled at a Mercedes-Benz Service Centre.
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. 82
KeyOpening and closing

Problem Possible causes/consequences and
M Solutions
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 325).
or
X Jump-start the vehicle (Y page 329).
or
X Consult a qualified specialist workshop. The engine cannot be
started using the key. The steering lock is mechanically blocked.
X
Remove the key and reinsert it into the ignition lock. While doing
this, turn the steering wheel in both directions. The engine cannot be
started using KEYLESS-
GO. The key is in the
vehicle. Ad
oor is open. Therefore, the key cannot be detected as easily.
X Close the door and try to start the vehicle again. There is interference from a powerful source of radio waves.
X Start your vehicle with the key in the ignition lock. Doors
Important safety notes
G
WARNING
Only for the United Kingdom: if the vehicle
has been locked with the key, the double lock
function is activated as standard. It is then not
possible to open the doors from inside the
vehicle.
Therefore, do not leave any people behind in
the vehicle, particularly children, elderly peo-
ple or people in need of special assistance if
the vehicle has been locked with the key. As
a result, they may not be able to free them-
selves in the event of an emergency. As a
result, they could be seriously or even fatally
injured by prolonged exposure to extremely
high or low temperatures, for example. In this
case, rescuing people from outside the vehi-
cle is difficult. Deactivate the interior motion sensor before
you lock the vehicle with the key. The doors
can then be opened from the inside after the
vehicle has been locked from the outside with
the key.
G
WARNING
If children are left unsupervised in the vehicle,
they could:
R open a door from inside the vehicle at any
time, even if it has been locked
R start the vehicle using akey which has been
left in the vehicle
R release the parking brake
They could thereby endanger themselves and
others. Never leave children unsupervised in
the vehicle. Always take the key with you
when leaving the vehicle, even if you are only
leaving it for a short time. Doors
83Opening and closing Z

Unlocking and opening the doors
from the inside
For all countries except the United King-
dom: you can open a door from inside the
vehicle even if it has been locked.
Only for the United Kingdom: if the vehicle
has been locked with the key, the double lock
function is activated as standard. It is then
not possible to open the doors from inside the
vehicle. Deactivate the interior motion sensor
(Y page 74) before you lock the vehicle with
the key. The doors can then be opened from
the inside after the vehicle has been locked
from the outside with the key. X
Pull door handle ;.
If the door is locked, locking knob :pops
up. The door is unlocked and can be
opened. Centrally locking and unlocking the
vehicle from the inside
You can centrally lock or unlock the vehicle
from the inside.
The central locking/unlocking button does
not lock or unlock the fuel filler flap.
i You cannot unlock the vehicle centrally
from the inside if the vehicle has been
locked with the key or KEYLESS-GO.
i It is only possible to lock the vehicle cen-
trally if the front-passenger door is closed. X
To unlock: press button :.
X To lock: press button ;. Automatic locking feature
The vehicle is locked automatically when the
ignition is switched on and the wheels are
turning.
You could therefore be locked out when:
R the vehicle is being pushed.
R the vehicle is being towed.
R the vehicle is being tested on a dynamom-
eter. X
To deactivate: press and hold button :
for about five seconds until a tone sounds.
X To activate: press and hold button ;for
about five seconds until a tone sounds.
On vehicles with a luxury multifunction steer-
ing wheel, you can also activate and deacti-
vate the automatic locking via the on-board
computer (Y page 226).84
DoorsOpening and closing

i
You will find details of the boot lid opening
dimensions in the Technical data section
(Y page 360).
The boot lid can be:
R opened and closed manually fro moutside
R opened automatically from outside
R opened automatically from inside
R locked separately
R unlocked with the emergenc ykey element Opening/closing manually
Opening X
Press the %button on the key. X
Pull handle :.
X Raise the boot lid.
Closing G
WARNING
Make sure that nobody can become trapped
when closing the boot lid. X
Pull the boot lid down using recess :.
X If necessary, lock the vehicle with
the & button on the key (Y page 78) or
with KEYLESS-GO (Y page 79).
i If a KEYLESS-GO key is detected in the
boot, the boot lid cannot be locked and
then opens again. Opening automatically from outside
Important safety notes G
WARNING
Only for the United Kingdom: if the vehicle
has been locked with the key, the double lock
function is activated as standard. It is then not
possible to open the doors from inside the
vehicle.
Therefore, do not leave any people behind in
the vehicle, particularly children, elderly peo-
ple or people in need of special assistance if
the vehicle has been locked with the key. As
a result, they may not be able to free them-
selves in the event of an emergency. As a
result, they could be seriously or even fatally
injured by prolonged exposure to extremely
high or low temperatures, for example. In this
case, rescuing people from outside the vehi-
cle is difficult.
Deactivate the interior motion sensor before
you lock the vehicle with the key. The doors
can then be opened from the inside after the
vehicle has been locked from the outside with
the key.
! The boot lid swings upwards when
opened. Therefore, make sure that there is
sufficien tclearance above the boot lid.
i You will find details of the boot lid opening
dimensions in the Technical data section
(Y page 360).
Opening You can open the boot lid automatically using
the key or the handle in the boot lid.86
BootOpening and closing

X
Press and hold the Fbutton on the key
until the boot lid opens.
or
X If the boot is unlocked, pull on the boot lid
handle and let it go again immediately. Opening automatically from inside
You can open the boot lid from the driver's
seat when the vehicle is stationary and
unlocked. X
To open: pull remote operating switch for
boot lid :until the boot lid opens. Locking the boot separately
In some countries, you can lock the boot sep-
arately. If you then unlock the vehicle cen-
trally, the boot remains locked and cannot be
opened.
X Close the boot lid.
X Take the emergency key element out of the
key (Y page 80). X
Inser tthe emergency key element into the
boot lid lock as far as the stop.
X Turn the emergency key element clockwise
from position 1to position 2.
X Remove the emergency key element.
X Insert the emergency key element into the
key. Unlocking the boot (emergency key
element)
! The boot lid swings upwards when
opened. Therefore, make sure that there is
sufficient clearance above the boot lid.
If the boot cannot be unlocked with the key
or KEYLESS-GO, use the emergency key ele-
ment.
If you use the emergency key element to
unlock and open the boot lid, the anti-theft
alarm system will be triggered (Y page 73).
X Take the emergency key element out of the
key (Y page 80).
X Insert the emergency key element into the
boot lid lock as far as the stop. X
Turn the emergency key element anti-
clockwise from position 1as far as it will
go to position 2.
The boot is unlocked.
X Turn the emergency key element back to
position 1and remove it.
X Insert the emergency key element into the
key. Boot
87Opening and closing Z

R
open the panorama sliding sunroof and the
roller sunblind
R switch on the seat ventilation for the driv-
er's seat
i The convenience opening feature can
only be operated using the key. The key
must be close to the driver's door handle.
X Point the tip of the key at the driver's door
handle.
X Press and hold the %button until the
side windows and the panorama sunroof
are in the desired position.
If the roller sunblind of the panorama sliding
sunroof is closed, the roller sunblind is
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
General notes When you lock the vehicle, you can simulta-
neously:
R close the side windows
R close the panorama sliding sunroof
On vehicles with a panorama sliding sunroof,
you can then close the roller sunblind. G
WARNING
When using the convenience closing feature,
make sure that nobody can become trapped.
Proceed as follows if there is a risk of entrap-
ment:
With the key:
R release the &button.
R press and hold the %button until the
side windows and the panorama sliding
sunroof open again. With KEYLESS-GO:
R
release the sensor surface on the door han-
dle.
R pull the door handle immediately and hold
it.
The side windows and the panorama sliding
sunroof open.
Using the key i
The key must be close to the driver's door
handle.
X Point the tip of the key at the driver's door
handle.
X Press and hold the &button until the
side windows and the panorama sliding
sunroof are fully closed.
X Make sure that all the side windows and the
panorama sliding sunroof are closed.
On vehicles with a panorama sliding sunroof:
X Press and hold the &button again until
the roller sunblind of the panorama sliding
sunroof closes.
X To interrupt convenience closing:
release the &button.
Using KEYLESS-GO The KEYLESS-GO key must be outside the
vehicle. All the doors must be closed. Side windows
89Opening and closing Z

Adjusting the steering wheel electri-
cally
:
To adjust the steering wheel height
; To adjust the steering wheel position
(fore-and-aft adjustment)
i Related topics:
R EASY-ENTRY/EXIT feature
(Y page 102)
R Storing settings (Y page 105)EASY-ENTRY/EXIT feature
Important safety notes The EASY-ENTRY/EXIT feature makes getting
in and out of your vehicle easier.
You can activate and deactivate the EASY-
ENTRY/EXIT feature in the on-board com-
puter (Y page 228). G
WARNING
Make sure that nobody can become trapped
when you activate the EASY-ENTRY/EXIT fea-
ture.
If there is a risk of someone becoming trap-
ped, stop the adjustmen tprocedure. To halt
the procedure:
R press the steering column adjustment but-
ton.
R briefly press one of the memory function
position buttons.
The steering column stops moving immedi-
ately. Do not keep the memory function position
button pressed down, otherwise the memory
function will start and the steering wheel and
seat will begi nto move.
Never leave children unsupervised in the vehi-
cle. They could open the driver's door and
thereby unintentionally activate the EASY-
ENTRY feature and become trapped.
Position of the steering wheel when the
EASY-ENTRY/EXIT feature is active The steering wheel tilts upwards if you:
R
remove the key from the ignition lock
R open the driver's door and KEYLESS-GO is
in position 1
R open the driver's door and the key is in
position 0or 1in the ignition lock
i The steering wheel only moves upwards if
it has not already reached the upper end
stop.
If you insert the key into the ignition lock with
the driver's door closed, the steering wheel is
automatically moved to the previously set
position.
Position of the steering wheel for driv-
ing The steering wheel is moved to the previously
set position if:
R the driver's door is closed
R you insert the key into the ignition lock
or
R you press the Start/Stop button once on
vehicles with KEYLESS-GO.
If you close the driver's door with the key
inserted into the ignition lock, the steering
wheel is automatically moved to the previ-
ously set position.
The last position of the steering wheel is
stored after each manual setting or when you
store the setting with the memory function
(Y page 105). 102
Steering wheelSeats, steering wheel and mirrors

Combination switch
1
$ Windscreen wipers off
2 Ä Intermittent wipe, low 7
3 Å Intermittent wipe, high 8
4 ° Continuous wipe, slow
5 ¯ Continuous wipe, fast
B í Single wipe/ îTo wipe the
windscreen using washer fluid
X Turn the key to position 1or 2in the ignition
lock.
X Turn the combination switch to the corre-
sponding position.
! Intermittent wiping with rain sensor: due
to optical influences and the windscreen
becoming dirty in dry weather conditions,
the windscreen wipers may be activated
inadvertently. This could damage the wind-
screen wiper blades or scratch the wind-
screen.
For this reason, you shoul dalways switch
off the windscreen wipers in dry weather.
In the ÄorÅ position, the appropriate
wiping frequency is set automatically accord-
ing to the intensity of the rain. In the Å
position, the rain sensor is more sensitive
than in the Äposition, causing the wind-
screen wiper to wipe more frequently. Replacing the wiper blades
Important safety notes G
WARNING
The wiper arms could star tmoving and cause
an injury if you leave the windscreen wipers
switched on.
Remove the key from the ignition lock before
replacing the wiper blades.
! To avoid damaging the windscreen wiper
blades, make sure that you touch only the
wiper arm of the windscreen wiper.
! Never open the bonnet if a windscreen
wiper arm has been folded away from the
windscreen.
Never fold a windscreen wiper arm without
a wiper blade back onto the windscreen.
Hold the windscreen wiper arm firmly when
you change the wiper blade. If you release
the windscreen wiper arm without a wiper
blade and it falls onto the windscreen, the
windscreen may be damaged by the force
of the impact.
Mercedes-Benz recommends that you have
the wiper blades replaced by aqualified
specialist workshop, e.g. at a Mercedes-
Benz Service Centre.
Replacing the wiper blades Removing the wiper blades
X
Remove the key from the ignition lock or
tur nthe key to position 0(KEYLESS-GO).
X Fold the wiper arm away from the wind-
screen until it engages.
X Set the wiper blade at right angles to the
wiper arm.
7 Rain sensor set to low sensitivity.
8 Rain sensor set to high sensitivity. Windscreen wipers
119Lights and windscreen wipers Z