2017 MERCEDES-BENZ C-Class COUPE key

iThe immobilizer is alwaysdeactivated when
you start the engine.
In the event that the engine cannot be started
(yet the vehicle's battery is charged), the sys-
tem is not operational. Contact an authorized
Mercedes-Benz Center or call
1-800-FOR-MERCedes (in the USA)o r
1-800-387-0100 (in Canada).
ATA (anti-theft alarms ystem)
XTo arm:lock the vehicle with the SmartKey or
KEYLESS-GO.
Indicator lamp :flashes. The alarm system
is armed after approximately ten seconds.
XTo deactivate: unlock the vehicle with the
SmartKey or KEYLESS-GO.
or
XInsert the SmartKey into the ignition lock.
Av isual and audiblea larm is triggered if the
alarm system is armed and you open:
Rad oor
Rthe vehicle with the mechanical key
Rthe trunk lid
Rthe hood
XTo deactivatet he alarm with the Smart-
Key: press the %or& button on the
SmartKey.
The alarm is switched off.
or
XVehicles with KEYLESS-GO start-function
or KEYLESS-GO: remove the Start/Stop but-
ton from the ignition lock (
Ypage 131).
XInsert the SmartKey into the ignition lock.
The alarm is switched off.
XTo stop the alarm using KEYLESS-GO:
grasp the outside door handle. The SmartKey
must be outside the vehicle.
The alarm is switched off.
or
XPress the Start/Stop button on the dash-
board. The SmartKey must be inside the vehi- cle.
The alarm is switched off.
The alarm is not switched off, even if you close
the open door that triggered it, for example.
iIf the alarm continues for more than
30 seconds, the mbrace emergencyc all sys-
tem automatically notifies the Customer
Assistance Center. This is done either by text message or data connection.
The emergencyc all system sends amessage
or establishes adata connection provided
that:
Ryou have subscribed to the mbrace service.
Rthe mbrace service has been activated
properly.
Rthe necessary mobile phone network is
available.
Protection against theft73
Safety
Z

SmartKey
Important safety notes
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangering other
people or road users.
Rget out and disrupt traffic.
Roperate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake.
Rshifting the automatic transmission out of
park position P
RStart the engine.
There is arisk 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.
GWARNING
If you attach heavy or large object stothe
SmartKey, the SmartKey could be uninten-
tionally turned in the ignition lock. This could
cause the engine to be switched off. There is a risk of an accident.
Do not attach any heavy or large object stothe
SmartKey. Remove any bulky key rings before
insertingt he SmartKey into the ignition lock.
!Keep the SmartKey away from stron gmag-
netic fields. Otherwise, the remote control
function could be affected.
Strong magnetic fields can occur in the vicin-
ity of powerful electrical installations.
Do not keep the SmartKey:
Rwith electronic devices, e.g. amobile phone
or another SmartKey.
Rwith metallic objects, e.g. coins or metal foil.
Rinside metallic objects, e.g. ametal case.
This can affect the functionality of the Smart- Key. Vehicles with KEYLESS-GO startf
unction:do
not keep the SmartKey on the parcel shelf or in
the trunk.O therwise, the SmartKey may not be
detected, e.g. when startin gthe engine using
the Start/Stop button.
Ac heck which periodically establishes aradio
connection between the vehicle and the Smart-
Key determines whether avalid SmartKey is in
the vehicle. This occurs, for example:
Rwhen startin gthe engine
Rwhile driving
Rwhen the external door handles are touched
Rduring convenience closing
SmartKey functions
:& To lock the vehicle
;FTo open/close the trunk lid
=%To unlock the vehicle
XTo unlock centrally: press the%button.
If you do not open the vehicle within approx-
imately 40 seconds of unlocking:
Rthe vehicle is locked again.
Ranti-theft protection is reactivated.
XTo lock centrally: press the&button.
The SmartKey centrally locks and unlocks the
following components:
Rthe doors
Rthe trunk lid
Rthe fuel filler flap
The turn signals flash once when unlocking and
three times when locking.
You can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated and deactivated via the
multimedia system (see the Digital Operator's
Manual).
74SmartKey
Opening and closing

You will receive visual and acoustic locking con-
firmation if all components were able to be
locked.
When the locator lighting is activatedvia the
multimedia system, it lightsupw hen it is dark
afte rthe vehicle is unlocked with the SmartKey
(see the Digital Operator's Manual).
XTo open th etrunk lid automaticall yfrom
outside th evehicle: press and hold the F
button until the trunk lid opens.
XTo open th etrunk lid automaticall yfrom
outside th evehicle: if the SmartKey is loca-
ted in the immediatev icinity of the vehicle,
press the Fbutton on the SmartKey.
When the trunk lid close syou can then
release the button.
KEYLESS-GO
Genera lnotes
Bear in mind that the engin ecan be started by
any of the vehicle occupant sifthere is aSmart-
Key in the vehicle (
Ypage 133).
Locking/unlocking centrally
You can start, lock or unloc kthe vehicle using
KEYLESS-GO. To do this ,you only need carr ythe
SmartKey with you. You can combine the func-
tion sofK EYLESS-GO with those of aconven-
tional SmartKey. Unlock the vehicle by using
KEYLESS-GO, for instance, and lock it using the
& button on the SmartKey.
The driver's door and the door at which the han-
dle is used, must both be closed. The SmartKey
must be outsid ethe vehicle. When locking or
unlockin gwith KEYLESS-GO, the distance
betwee nthe SmartKey and the corresponding
door handle must not be greater than 3ft(1m ).
Ab rief radio connection betwee nthe vehicle
and the SmartKey determine swhether avalid
SmartKey is in, or in the directv icinity of, the
vehicle. This occurs, for example:
Rwhen startin gthe engine
Rwhile driving
Rwhen using HANDS-FREE ACCESS
Rwhen the external door handles are touched
Rduring convenienc eclosing
XTo unlock th evehicle: touchthe inner sur-
face of the door handle.
XTo lock th evehicle: touchsensor surface :
or ;.
Make sure that you do not touc hthe inner
surfaceoft he door handle.
XConvenience closing feature: touch
recessed sensor surface ;for an extended
period.
Further information on the convenienc eclos-
ing feature (
Ypage 88).
Deactivating and activating
If you do not intend to use aSmartKey for an
extended period of time, you can deactivate the
KEYLESS-GO function of the SmartKey. The
SmartKey will the nuse very little power, thereby
conserving battery power. For the purposes of
activation/deactivation, the vehicle must not be
nearby.
XTo deactivate: press the&button on the
SmartKey twic einrapid succession.
The battery chec klamp (
Ypage 77) of the
SmartKey flashes twic ebriefly and lightsu p
once, the nKEYLESS-GO is deactivated.
XTo activate: press any button on the Smart-
Key.
or
XInsert the SmartKey int othe ignition lock.
KEYLESS-GO and all of its associated features
are available again.
SmartKey75
Opening and closing
Z

KEYLESS-GOstartfun ction
Gene raln otes
Bear in min dthatthe engin ecan be started by
any of th evehicl eoccupant sifthere is aSmart-
Key in th evehicl e(
Ypage 133).
Changing th esettings ofthel ocki ng
system
You can chang ethe setting softhelocking sys-
tem. This mean sthato nlyt he driver's door and
th ef uel filler flap are unlocke dwhen th evehicl e
is unlocked. This is useful if you frequentl ytravel
alone.
XTo change th esetting: press and hold down
th e% and& buttons simultaneousl y
for approximately six seconds until th ebat-
tery chec klamp (
Ypage 77) flashes twice .
If th esetting of th elocking system is changed
within th esignal range of th evehicle, pressing
th e& or% button:
Rlocks or
Runlocks th evehicl e
The SmartKey no wfunction sasfollows :
XTo unlock: press the% buttononce.
XTo unlock centrally: press the% button
twice .
XTo lock: press the& button.
The KEYLESS-GO function scan be changed as
follows :
XTo unlock th edriver's door :touch th einner
surfac eofthedoor handle on th edriver's
door .
XTo unlock centrally: touch theinner surfac e
of th efront-pa ssenger door handle.
XTo lock centrally: touch theouter sensor
surfac eono neof th edoor handles .
XTo restorethe factory settings: press and
hold th e% and& buttons simultane -
ousl yfor approximately six seconds until th e
bat tery che
c klamp (Ypage 77) flashes
twice .
Mechanical key
Gene raln otes
If th evehicl ecan no longer be locke dor
unlocke dwitht he SmartKey or KEYLESS-GO ,
use th emechanical key.
If you use th emechanical ke ytou nloc kand
open th edriver's door ,the anti-thef talarm sys-
te mw ill be triggered .Switc hoff th ealarm
(
Ypage 73) .
If you unloc kthe vehicl eusingthe mechanical
key, th efuel filler flap will no tbeunlocke dauto -
matically.
XTo unlock th efuelfiller flap: insert the
SmartKey int othe ignition lock.
Removing th emechanicalk ey
XPush release catch :in th edirection of th e
arrow and at th esam etimer emove mechan -
ical ke y; from th eSmartKey.
Further information :
RUnlocking thedriver's door (Ypage 82)
RLocking th evehicl e(Ypage 82 )
Inserting th emechanicalk ey
XPush mechanical ke y; completely int othe
SmartKey until it engage sand release
catch :is bac kinitsbasic position .
76SmartKey
Opening and closing

SmartKey battery
Important safety notes
GWARNING
Batteries contain toxic and corrosive substan- ces. If batteries are swallowed, it can result in
severe health problems. There is arisk of fatal
injury.
Keep batteries out of the reach of children. If
ab attery is swallowed, seek medical attention
immediately.
HEnvironmental note
Batteries contain dangerous
substances. It is against the
law to dispose of them with
the household rubbish. They
must be collected separately and recycled to protect the
environment.
Dispose of batteries in an
environmentally friendly
manner. Take discharged
batteries to aqualified spe-
cialist workshop or aspecial
collection point for used bat-
teries.
The SmartKey batteries contain perchlorate
material, which may require special handling
and regard for the environment. National guide-
lines must be observed during disposal. In Cal-
ifornia, see www.dtsc.ca.gov/
HazardousWaste/Perchlorate/index.cfm .
Mercedes-Benz recommends that you have the
batteries replaced at aqualified specialist work-
shop.
Checking the battery
XPress the &or% button.
The battery is working properly if battery
check lamp :lights up briefly.
The battery is discharged if battery check
lamp :does not light up briefly.
XChange the battery (Ypage 77).
If the SmartKey battery is checked within the
signal reception range of the vehicle, pressing
the & or% button:
Rlocks or
Runlocks the vehicle
iYou can get abattery at any qualified spe-
cialist workshop.
Replacing the battery
You require aCR20253Vc ell battery.
XTake the mechanical key out of the SmartKey
(Ypage 76).
XPress mechanical key ;into the SmartKey
opening in the direction of the arrow until bat-
tery compartmentc over:opens. Do not
hold battery compartmentc over:closed
while doing so.
XRemove battery compartmentc over:.
SmartKey77
Opening and closing
Z

XRepeatedly tap theSmartKey against your
palm until battery =falls out .
XInsertthe newb attery wit hthe positive ter-
minal facing upwards. Use alint-free cloth to
do so.
XMak esuret hatthe surfac eofthebattery is
free of lint, grease and other contaminants.
XInser tthe fron ttab sofb attery compartmen t
cover :intothe housing first and then press
to close it .
XInsertmechanical ke y; intot he SmartKey
(Ypage 76).
XChec kthe function of all SmartKey buttons on
th ev ehicle.
78SmartKey
Opening and closing

Problems with the SmartKey
ProblemPossible causes/consequences andMSolutions
You can no longer lock or
unlock the vehicle using
the SmartKey.The SmartKey battery is discharged or nearly discharged.
XCheck the SmartKey battery (Ypage 77) and replace it if necessary
(Ypage 77).
If this does not work:
XUnlock (Ypage 82) or lock (Ypage 82) the vehicle using the
mechanical key.
There is interference from apowerful source of radio waves.
XUnlock (Ypage 82) or lock (Ypage 82) the vehicle using the
mechanical key.
The SmartKey is faulty.
XUnlock (Ypage 82) or lock (Ypage 82) the vehicle using the
mechanical key.
XHave the SmartKey checked at aqualified specialist workshop.
You can no longer lock or
unlock the vehicle using
KEYLESS-GO.KEYLESS-GO was deactivated.
XReactivate KEYLESS-GO (Ypage 75).
The SmartKey battery is discharged or nearly discharged.
XCheck the SmartKey battery (Ypage 77) and replace it if necessary
(Ypage 77).
If this does not work:
XUnlock (Ypage 82) or lock (Ypage 82) the vehicle using the
mechanical key.
There is interference from apowerful source of radio waves.
XUnlock (Ypage 82) or lock (Ypage 82) the vehicle using the
mechanical key.
KEYLESS-GO is malfunctioning.
XLock/unlock the vehicle using the remote control function of the
SmartKey.
XHave the vehicle and SmartKey checked at aqualified specialist
workshop.
If the vehicle can also not be locked/unlocked using the remote con-
trol function:
XUnlock (Ypage 82) or lock (Ypage 82) the vehicle using the
mechanical key.
XHave the vehicle and SmartKey checked at aqualified specialist
workshop.
SmartKey79
Opening and closing
Z

ProblemPossible causes/consequences andMSolutions
The engine cannot be
started using the Smart-
Key.The on-board voltage is too low.
XSwitch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
XCheck the starter battery and charge it if necessary (Ypage 307).
or
XJump-start the vehicle (Ypage 308).
or
XConsult aqualified specialist workshop.
The engine cannot be
started using the Start/
Stop button. The Smart-
Key is in the vehicle.The vehicle is locked.
XUnlock the vehicle and try to start the vehicle again.
The SmartKey battery is discharged or nearly discharged.
XCheck the SmartKey battery (Ypage 77) and replace it if necessary
(Ypage 77).
If this does not work:
XStart your vehicle with the SmartKey in the ignition lock.
There is interference from apowerful source of radio waves.
XStart your vehicle with the SmartKey in the ignition lock.
You have lost aSmart-
Key.XHave the SmartKey deactivated at aqualified specialist workshop.
XReport the loss immediately to the vehicle insurers.
XIf necessary, have the locks changed as well.
You have lost the
mechanical key.XReport the loss immediately to the vehicle insurers.
XIf necessary, have the locks changed as well.
Doors
Important safety notes
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangering other
people or road users.
Rget out and disrupt traffic.
Roperate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake.
Rshifting the automatic transmission out of
park position P
RStart the engine.
There is arisk 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.
80Doors
Opening and closing