lock MERCEDES-BENZ C-CLASS COUPE 2015 Owner's Guide

Deactivating
X
Unloc kthe vehicle wit hthe keyorK EYLESS-
GO.
or X Inser tthe keyintot he ignition lock.
Tow-away protection is switched of fautomat-
ically.
Deactivating To preven
tafalsea larm, deactivat etow-a way
protection if you loc kyour vehicle and it:
R is bein gtransported
R is bein gloaded onto aferry or car transporter,
fo re xample
R is parke donam ovable surface, e.g. in asplit-
level garage
You can deactivat etow-a way protection via the
multimedia syste m(seet he Digital Owner's
Manual).
Tow-away protection remain sdeactivated until:
R thev ehicle is unlocke dagain and
R ad ooriso penedand close dagain and
R thev ehicle is locke dagain Interior motion sensor
Function Whe
nthe interio rmotion sensor is primed ,a
visual and audible alar mistriggere difm ove-
men tisd etecte dinthevehicle interior. Thi scan
occur if someon ereaches into th evehicle inte-
rior, fo rexample.
Priming X
Mak esuret hat:
R thes idew indows are closed
R thes lidin gsunroof or th epanorama sliding
sunroof is closed
R there are no objects ,e.g.m ascots ,hanging
on th erear-vie wmirrororont hegrab han-
dles on th erooftrim
Thi sw ill preven tfalse alarms.
X Mak esuret hat: R
thed oors are closed
R thes lidin gsunroof or th epanorama sliding
sunroof is closed
R theb ootlid is closed
Only then is th einterior motion sensor acti-
vated.
X Loc kthe vehicle wit hthe keyorK EYLESS-GO.
The interio rmotion sensor is primed after
approximately te nseconds.
Deactivating X
Unloc kthe vehicle wit hthe keyorK EYLESS-
GO.
or X Inser tthe keyintot he ignition lock.
or X Press th eStart/Sto pbutton.
The ke ymustbeint hevehicle.
The interio rmotion sensor is automatically
switched off.
Deactivating To preven
tafalsea larm, deactivat ethe interior
motion sensor if you loc kyour vehicle and:
R people or animals remain in th evehicle
R thes lidin gsunroof or panorama slidin gsun-
roof remain sopen
R thes idew indows remain open
You can deactivat ethe interio rmotion sensor
via th emultimedia syste m(seet he Digital Own-
er' sM anual).
The interio rmotion sensor remain sdeactivated
until:
R thev ehicle is unlocke dagain and
R ad ooriso penedand close dagain and
R thev ehicle is locke dagain Protection against theft
79Safety Z

Key
Important safety notes
United Kingdom only: G
WARNING
Whe nthe doubl elocks are activated, the
door scan no longer be opened from the
inside. People in th evehicl ecan no longer get
out ,e.g.inh azardous situations. There is a
ris kofi njury.
Therefore ,donotleav eany people unsuper-
vised in th evehicle, particularly children ,eld-
erl yp eople or people in need of special assis-
tance .Don otactivat ethe doubl eloc kw hen
people are in th evehicle.
If th evehicl ehas been locke dfromt heoutside,
th ed oubl eloc kf unction is activated as stand-
ard. It is then no tpossibl etoopen th edoors
from inside th evehicle. You can deactivat ethe
doubl eloc kfunction by deactivating th einterior
motion sensor (see th eseparat emultimedia
system operating instructions). The door scan
then be opened from th einside after th evehicle
has been locke dfromt heoutside .The anti-theft
alarm system is triggered if th edoor is opened
from th einside. Switc hoff th ealarm
(Y page 78).
All countries: G
WARNING
If children are lef tunsupervised in th evehicle,
they could:
R open doors, thereby endangering other per-
son sorr oad users
R get out and be struc kbyoncomingt raffic
R operate vehicl eequipmen tand become
trapped ,for example
In addition ,the children could also set the
vehicl einm otion,for example, if they:
R release th eparking brake
R shift th eautomatic transmission out of park
position Porshift manual transmission into
neutral
R start th eengine
There is ariskofana ccidentand injury. Whe
nleaving th evehicle, always tak ethe key
wit hyou and loc kthe vehicle. Never leave
children and animals unattended in th evehi-
cle .Keept he keys out of th ereac hofc hildren. G
WARNING
If you attach heav yorlargeobjects to th ekey,
th ek eycould be unintentionally turne dinthe
ignition lock. This could caus ethe engin eto
be switched off .There is ariskofana ccident.
Do no tattach any heav yorlargeobjects to the
key. Remove any bulk ykeyrings before insert-
ing th ekeyintot he ignition lock.
! Kee
pthe keya way from stron gmagnetic
fields. Otherwise ,the remot econtro lfunction
could be affected.
Stron gmagnetic fields can occur in th evicin-
it yofp owerful electrical installations.
Do no tkeept he key:
R wit he lectronic devices, e.g. amobile phone
or another key
R wit hm etallic objects ,e.g.c oins or metal film
R inside metallic objects ,e.g.a metal case
This can affec tthe key's functionality.
Vehicles wit hKEYLESS-G Ostart function: do
no tk eept he keyo nthe parcel shelf or in the
boot .Otherwise ,the keym ay no tbed etected,
e.g. when starting th eengineu singthe Start/
Stop button.
Ac heck whichperiodically establishes aradio
connection between th evehicl eand th ekey
determine swhether avalid ke yisint hevehicle.
This occurs, for example:
R when starting th eengine
R whils tdriving
R when th eexternal door handles are touched
R during convenience closing 80
KeyOpening and closing

Key functions
:
& Locks th evehicle
; F Opens/close sthe boot lid
= % Unlocks th evehicle
X To unlock centrally: press the%button.
If you do no topen th evehicl ewithin approx-
imately 40 seconds of unlocking:
R thev ehicl elocks again
R protection against theft is reactivated
X To lock centrally: press the&button.
The ke ycentra lly locks and unlocks th efollow-
ing components:
R thed oors
R theb oot lid
R thef uel filler flap
Whe nunlocking ,the turns ignals flas honce.
Whe nlocking ,the yflas hthree times.
You can also set an audibl esignal to confirm
that th evehicl ehas been locked. The audible
signal can be activated and deactivated via the
multimedia system (see th eDigital Owner's
Manual).
Only when all th ecom ponent shaveb een
locked, does th eoptical or acoustic locking con-
firmation sound.
Whe nthe locato rlighting is activated via the
multimedia system, it lights up when it is dark
after th evehicl eisu nlocke dwitht he key( see
th eD igital Owner' sManual).
X To open th
eboot lid automatically from
outsid ethe vehicle: press and hold the F
butto nuntil th eboot lid opens.
X To close th
eboot lid automatically from
outsid ethe vehicle: if thekeyis locate din th
ei mmediat evicinity of th evehicle, press
the F buttonont hekey.
Whe nthe boot lid closes you can then release
th eb utton. KEYLESS-GO
Genera lnotes Bear in min
dthatthe engin ecan be started by
any of th evehicl eoccupant sifthere is akeyin
th ev ehicl e(Ypage 148).
Lockin gand unlockin gcentrally You can start
,loc koru nlockthe vehicl eusing
KEYLESS-GO .Todothis, you need to carry the
ke yw ithy ou. You can combine th eKEYLESS-GO
function switht he function sofaconventional
key. Unloc kthe vehicl ebyu singK EYLESS-GO,
for instance ,and loc kitusingthe & button
on th ekey.
The driver's door and th edoor at whic hthe han-
dle is used mus tbothbec losed.The ke ymustbe
outside th evehicle. Whe nlocking or unlocking
wit hK EYLESS-GO ,the distanc ebetween th ekey
and th ecorre spondin gdoor handle mus tnotbe
greate rtha n1m.
Ab rief radi oconnectio nbetween th evehicle
and th ekeydetermine swhether avalid ke yisin,
or in th edirec tvicinity of, th evehicle. This
occurs, for example:
R when starting th eengine
R whils tdriving
R when usin gHANDS-F REEA CCESS
R when th eexternal door handles are touched
R during convenience closing Key
81Opening and closing Z

X
To unloc kthe vehicle: touch the inne rsur-
fac eoft he door handle.
X To lock the vehicle: touch sensor surface :
or ;.
Make sure tha tyou do not touch the inner
surface of the door handle.
X Convenience closin gfeature: touch
recesse dsensor surface ;for an extended
period.
For further informatio nonthe convenience
closing feature (Y page 94).
Deactivating and activating If yo
udon ot intend to us eakey for an extended
perio doftime,you can deactivate the KEYLESS-
GO functio nofthe key .The key will then us every
little power, thereb yconserving battery power.
For the purposes of activation or deactivation,
the vehicl edoesn ot have to be nearby.
X To deactivate: press the&button on the
key twice in rapid succession.
The battery check lamp (Y page 83)ofthe
key flashe stwice briefl yand lights up once,
then KEYLESS-GO is deactivated.
X To activate: press any button on the key.
or
X Insert the key into the ignition lock.
KEYLESS-GO and al lofits associate dfeatures
are available again. KEYLESS-GO start function
General notes Bea
rinm ind tha tthe engine can be started by
any of the vehicl eoccupants if ther eisakey in
the vehicl e(Ypage 148). Changin
gthe settings of the locking
system
Yo uc an change the settings of the locking sys-
tem. Thi smeans tha tonlyt he driver's door and
the fue lfille rflapa re unlocke dwhent he vehicle
is unlocked. Thi sisusefulify oufrequently travel
alone.
X To chang ethe setting: simultaneousl ypress
the % and& buttons for approximately si
xs econds unti lthe battery check lamp
(Y page 83) flashe stwice.
If the setting of the locking system is changed
withi nthe signa lrang eoft he vehicle, pressing
the & or% button:
R locks or
R unlocks the vehicle
The key now functions as follows:
X To unlock: press the%button once.
X To unloc kcentrally: press the %button
twice.
X To lock: press the &button.
The KEYLESS-GO functions can be changed as
follows: X To unloc kthe driver' sdoor: touch the inner
surface of the door handl eonthe driver's
door.
X To unloc kcentrally: touch the inne rsurface
of the front-passenger door handle.
X To lock centrally: touch the outer sensor
surface on one of the door handles.
X To restore the factory settings: press and
hol dthe % and& buttons simultane-
ousl yfor approximatel ysixseconds unti lthe
battery check lamp (Y page 83)flashes
twice. Emergenc
ykey element
General notes If the vehicl
ecan no longer be unlocke dwitht he
key or KEYLESS-GO ,use the emergency key ele-
ment.
If yo uusethe emergency key element to unlock
and open the driver' sdoor, the anti-thef talarm
system will be triggered .Switch off the alarm
(Y page 78).
If yo uunlock the vehicl eusing the emergency
key element, the fue lfille rflapw illn ot be
unlocke dautomatically.
X To unloc kthe fue lfille rflap: insert the key
into the ignition lock. 82
KeyOpening and closing

Removin
gthe emergenc ykey element X
Push release catch :in the direction of the
arrow and ,atthe same time ,remove emer-
gency key element ;from the key.
Further information:
R Unlocking the driver' sdoor(Ypage 88)
R Locking the vehicl e(Ypage 88)
Inserting the emergenc ykey element X
Push emergency key element ;completely
into the key unti litengages and release
catch :is back in its basic position. Battery of the key
Important safety notes G
WARNING
Batterie scontain toxic and corrosiv esubstan-
ces. If batteries are swallowed, it can resul tin
severe health problems .There is ariskoff atal
injury.
Kee pbatteries ou tofthe reach of children. If
ab attery is swallowed, see kmedica lattention
immediately. H
Environmental note Batterie
scontain pollutants.
It is illega ltodispose of them
with the househol drubbish.
The ym ustb ec ollected sep-
arately and disposed of in an environmentally responsible
recycling system.
Dispose of batteries in an
environmentally responsible
manner. Take discharged
batteries to
aquali fied spe-
cialist worksho portoacol-
lection point for used batter-
ies.
Mercedes-Benz recommend sthat yo uhavet he
batteries replaced at aquali fied specialist work-
shop.
Checking the battery X
Press the &or% button.
The battery is working properly if battery
check lamp :lights up briefly.
The battery is discharge difbattery check
lamp :doe snot light up briefly.
X Replace the battery (Y page 83).
If the key battery is checke dwithin the signal
reception rang eofthe vehicle, pressing the
& or% button:
R locks or
R unlocks the vehicle
i Yo
uc an obtain abattery from any qualified
specialist workshop.
Replacing the battery Yo
ur equire aCR20253Vc ellb attery.
X Take the emergency key element ou tofthe
key (Y page 83). Key
83Opening and closing Z

Problems with the key
Problem
Possible causes/consequences and
M
MSolutions You can no longer lock or
unlock the vehicle using
the key. The key battery is discharged or nearly discharged.
X Check the key battery (Y page 83) and replace if necessary
(Y page 83).
If this does not work: X Unlock (Y page 88) or lock (Y page 88) the vehicle using the
emergency key element. There is interference from
apowerful source of radio waves.
X Unlock (Y page 88) or lock (Y page 88) the vehicle using the
emergency key element. The key is faulty.
X Unlock (Y page 88) or lock (Y page 88) the vehicle using the
emergency key element.
X Have the key checked at aqualified specialist workshop. You can no longer lock or
unlock the vehicle using
KEYLESS-GO. KEYLESS-GO was deactivated.
X Reactivate KEYLESS-GO (Y page 81). The key battery is discharged or nearly discharged.
X Check the key battery (Y page 83) and replace if necessary
(Y page 83).
If this does not work: X Unlock (Y page 88) or lock (Y page 88) the vehicle using the
emergency key element. There is interference from
apowerful source of radio waves.
X Unlock (Y page 88) or lock (Y page 88) the vehicle using the
emergency key element. There is
afault with KEYLESS-GO.
X Lock/unlock the vehicle using the remote control function of the
key.
X Have the vehicle and key checked at aqualified specialist work-
shop.
If the vehicle can also not be locked/unlocked using the remote con-
trol function:
X Unlock (Y page 88) or lock (Y page 88) the vehicle using the
emergency key element.
X Have the vehicle and key checked at aqualified specialist work-
shop. Key
85Opening and closing Z

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 343).
or X Jump-start the vehicle (Y page 345).
or X Consult aqualified 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 83) and replace if necessary
(Y page 83).
If this does not work: X Start your vehicle with the key in the ignition lock. There is interference from
apowerful source of radio waves.
X Start your vehicle with the key in the ignition lock. You have lost
akey. X
Have the key deactivated at aqualified 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 outside,
the double lock function is activated as stand-
ard. It is then not possible to open the doors
from inside the vehicle. You can deactivate the
double lock function by deactivating the interior
motion sensor (see the separate multimedia
system operating instructions). The doors can
then be opened from the inside after the vehicle
has been locked from the outside. The anti-theft alarm system is triggered if the door is opened
from the inside. Switch off the alarm
(Y page 78).
All countries: 86
DoorsOpening and closing

G
WARNING
If children are left unsupervised in the vehicle, they could:
R open doors, thereby endangering other per-
sons or road users
R get out and be struck by oncoming traffic
R operate vehicl eequipment and become
trapped, for example
In addition, the children coul dalsos et the
vehicl einm otion, for example, if they:
R release the parking brake
R shift the automatic transmission out of park
position Porshift manua ltransmission into
neutral
R start the engine
There is arisk of an accident and injury.
When leaving the vehicle, alwayst ake the key
with you and lock the vehicle. Never leave
children and animals unattended in the vehi-
cle. Keep the keys out of the reach of children. Unlocking and opening the doors
from the inside
Unite dKingdom only: if the vehiclehas 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
insid ethe vehicle. You can deactivate the dou-
ble lock function by deactivating the interior
motion sensor (see the Digita lOwner's Manual).
The doors can then be opened from the inside
after the vehicl ehas been locked from the out-
side .The anti-theft alarm system is triggere dif
the door is opened from the inside. Switch off
the alarm (Y page78).
For all countries except the Unite dKingdom:
You can open adoor from insid ethe vehicle
even if it has been locked. If the vehicl ehas pre-
viously been locked with the key or with KEY-
LESS-GO, opening adoor from the insid ewill
trigger the anti-theft alarm system. Switch off
the alarm (Y page78). X
Pulld oor handle ;.
If the door is locked, locking knob :pops up.
The door is unlocked and opens. Centrally locking and unlockin
gthe
vehicle from the inside
You can centrally lock and unlock the vehicle
from the inside. The switches are on the driver's door. X
To unlock: press button :.
X To lock: press button ;.
When the front-passenge rdoor is closed ,the
vehicl eislocked.
This does not lock or unlock the fuel filler flap.
You cannot unlock the vehicl ecentrally from the
insid eifthe vehicl ehas been locked with the key
or KEYLESS-GO.
For all countries except the Unite dKingdom:
The doors can be opened from the inside.
If the vehicl ehas previousl ybeen locked with
the key or with KEYLESS-GO, opening adoor
from the insid ewillt rigger the anti-theft alarm
system. Switch off the alarm (Y page78).
Unite dKingdom only: if the vehiclehas been
locked with the key or with KEYLESS-GO, the Doors
87Opening and closing Z

double lock function is activated as standard. It
is then not possible to open the doors from
inside the vehicle. You can deactivate the dou-
ble lock function by deactivating the interior
motion sensor (see the Digital Owner' sManual).
Opening/closing doors is then possible as fol-
lows: the doors can be opened from inside.
When alocked door is opened from inside the
vehicle, the previous unlocking proces swill be
acknowledged if the vehicle:
R has been locked with the locking butto nfor
the central locking or
R has been locked automatically
The vehicle will be fully unlocked if it had previ-
ously been fully unlocked. Only the door which
has been opened from the inside is unlocked if
only the driver' sdoor had been previously
unlocked. Automatic locking feature
X
To deactivate: press and hold button :for
approximately five seconds until atone
sounds.
X To activate: press and hold button ;for
approximately five seconds until atone
sounds.
If you press one of the two buttons and do not
hear atone, the relevant setting has already
been selected.
The vehicle is locked automatically when the
ignition is switched on and the wheels are turn-
ing.
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 adynamometer i
You can activate and deactivate the auto-
matic locking mechanism via the multimedia
system (see the Digital Owner' sManual). Unlocking/locking the driver's door
using the emergency key element
i If you want to centrally lock the vehicle using
the emergency key element ,begin by press-
ing the locking butto nfor the interior locking
mechanism while the driver' sdoor is open.
Then lock the driver' sdoor using the emer-
genc ykey element. X
Inser tthe emergency key element int oopen-
ing :in the protective cap.
X Pull and hold the door handle.
X Pull the protective cap on the emergency key
as straight as possible away from the vehicle until it releases.
X Release the door handle. X
To unlock: turn the emergency key element
anti-clockwise as far as it will go to position
1.
X To lock: turn the emergency key element
clockwise as far as it will go to position 1.88
DoorsOpening and closing

Right-hand-drive vehicle:
turn the emergency
key element in the opposite direction in both
cases.
If yo uusethe emergency key element to unlock
and ope nthe driver' sdoor, the anti-theft alarm
system will be triggered. Switch off the alarm
(Y page 78). Boot
Important safety notes
G
WARNING
Combustio nengines emi tpoisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the boot
li diso penw hent he engine is running, espe-
ciall yift he vehicle is in motion. There is arisk
of poisoning.
Alway sswitch off the engine before opening
the boo tlid.N eve rdrive with the boo tlid
open. G
WARNING
If objects, luggage or loads are not secured or not secured sufficiently ,they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is ariskofi njury, especially
whe nbraking or abruptly changing directions.
Alway sstore objects so that they cannot be
flung around .Secure objects, luggage or
loads against slipping or tipping before the
journey.
! The boo
tlid swings upwards whe nopened.
Therefore, make sure that there is sufficient
clearance above the boo tlid.
The opening dimensions of the boo tlid can be
found in the "Vehicl edata" section
(Y page 377).
You can limit the opening angl eofthe boo tlid in
the multimedi asystem (se ethe Digital Owner's
Manual).
Do not leave the key in the boot. You could oth- erwise lock yoursel fout.
Stow luggage or loads preferabl yinthe boot.
Observe the loading guidelines (Y page 308). Obstacl
edetection with boot lid
reversin gfeature
Vehicles with boot li dremote closing fea-
ture:
The boo tlid is equipped with automatic obstacle
detection with reversing feature .Ifasolid object
blocks or restricts the boo tlid whe nautomati-
cally opening, this procedure is stopped .Ifa
solid object blocks or restricts the boo tlid when
automaticall yclosing, the boo tlid opens again
automatically. The automatic obstacl erecogni-
tion with reversing function is only an aid. It is
not asubstitute for your attentivenes swhen
opening and closing the boo tlid. G
WARNING
The reversing function doe snot react:
R to soft, light and thin objects, e.g. fingers
R over the last 8mmofthe closing path
The reversing feature cannot prevent some-
one being trapped in these situations in par-
ticular. There is ariskofi njury.
Whe nclosing make sure that no bod yparts
are in the closing area.
If someone is trapped:
R press the Fbutton on the key or
R pull or press the remote operating switch
on the driver' sdooror
R press the closing or locking button on the
boo tlid.
Vehicles with HANDS-FREE ACCESS:
It is also possible to stop the closing process by performing akicking movement under the rear
bumper. Opening and closin
gmanually
Opening X
Press the Fbutton on the key.
The boo tlid opens. Boot
89Opening and closing Z