2017 MERCEDES-BENZ C-Class COUPE Owner's Manual

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

Unlocking and opening doors from
the inside
You can openadoor from inside the vehicle
even if it has been locked. If the vehicle has been
locked with the SmartKey or with KEYLESS-GO,
openin gadoor from the inside will trigger the
anti-theft alarm system .Switc hoff the alarm
(
Ypage 73).
XPull door handle ;.
If the door is locked, locking knob :pops up.
The door is unlocked and opens.
Centrally locking and unlocking the
vehicle from the inside
You can centrally lock and unlock the vehicle
from the inside. The switches are on the driver’s
door.
XTo unlock: press button :.
XTo lock:press button ;.
When the front-passenge rdoor is closed, the
vehicle is locked.
Meanwhile, the fuel filler flap will not be locked
or unlocked. You cannot unlock the vehicle centrally from the
inside if the vehicle has been locked with the
SmartKey or KEYLESS-GO.
The doors can be opened from the inside.
If the vehicle has been locked with the SmartKey
or with KEYLESS-GO, openin gadoor from the
inside will trigger the anti-theft alarm system.
Switc hoff the alarm (
Ypage 73).
When alocked door is opened from inside the
vehicle, the previous unlocking process will be
acknowledged if the vehicle:
Rhas been locked with the locking button for
the central locking or
Rhas been locked automatically
The vehicle will be fully unlocked if it had previ-
ously been fully unlocked. If only the driver's
door had been previously unlocked, only the
door which has been opened from the inside is
unlocked.
Automatic locking feature
XTo deactivate: press and hold button :for
approximately five seconds until atone
sounds.
XTo 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 relevants etting has already
been selected.
The vehicle is locked automatically when the
ignition is switched on and the wheels are turn-
ing.
You could therefore be locked out if:
Rthe vehicle is being pushed.
Rthe vehicle is being towed.
Rthe vehicle is on aroller dynamometer.
Doors81
Opening and closing
Z

iYou can activate and deactivate the auto-
matic locking mechanism via the multimedia
syste m(see the Digital Operator's Manual).
Unlocking/locking th edriver' sdoor
using th emechanical key
i
If you want to centrally lock the vehicle using
the mechanical key, begin by pressing the
locking button for the interior locking mech-
anism while the driver's door is open. Then
lock the driver's door using the mechanical
key.
XInsert the mechanical key int oopening :in
the protective cap.
XPull and hold the door handle.
XPull the protective cap on the mechanical key
as straight as possible away from the vehicle
until it releases.
XRelease the door handle.
XTo unlock: turn the mechanical key counter-
clockwise as far as it will go to position 1.
XTo lock:turn the mechanical key clockwise as
far as it will go to position 1.
If you use the mechanical key to unloc kand
open the driver's door, the anti-theft alarm sys- tem will be triggered.S
witch off the alarm
(
Ypage 73).
Trunk
Important safetyn otes
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbo nmonoxide. Exhaust
gases can enter the vehicle interior if the
trunk lid is open when the engin eisrunning,
especially if the vehicle is in motion. There is a
risk of poisoning.
Always switc hoff the engin ebeforeo pening
the trunk lid. Never drive with the trunk lid
open.
GWARNING
If objects, luggage or loads are not secured or
not secured sufficiently, the ycould slip, tip
over or be flung around and thereby hit vehicle
occupants. There is arisk of injury, particu-
larly in the eventofs udden braking orasud-
den change in direction.
Always store object ssothat the ycannot be
flung around .Secure objects, luggage or
loads against slipping or tippin gbeforet he
journey.
!The trunk lid swings upwards when opened.
Therefore, make sure that there is sufficient
clearance above the trunk lid.
The openin gdimensionsoft he trunk lid can be
foundint he "Vehicle data" section
(
Ypage 349).
You can limit the openin gangle of the trunk lid in
the multimedia syste m(see the Digital Opera-
tor's Manual).
Do not leave the SmartKey in the trunk .You
could otherwise lock yourself out.
You should preferably place luggage or loads in
the trunk .Observe the loading guidelines
(
Ypage 268).
82Trunk
Opening and closing

Obstacle detection with reversing
feature for the trunk lid
Vehicles with trunk lid remoteclosing fea-
ture:
The trun klid is equipped with automatic obsta-
cle detection with areversingf eature. Ifasolid
objec tblocks or restrictst he trunklid when
automatically opening ,this procedure is stop-
ped. If asolid objec tblocks or restrictst he trunk
lid when automatically closing, the trun klid
opens again automatically. The automatic
obstacle detection with reversingf eature is only
an aid. It is not asubstitute for your attentive-
ness when opening and closing the trun klid.
GWARNING
The reversingf eature does not respond:
Rto soft,light and thin objects, e.g. fingers
Rover the last 1/3 in (8 mm) of the closing
movement
The reversingf eature cannot prevents ome-
one being trapped in these situation sinpar-
ticular. There is arisk of injury.
Make sure that no body parts are in close
proximit yduring the closing procedure.
If somebody becomes trapped:
Rpress the Fbutton on the SmartKey, or
Rpull or press the remoteo peratingswitch
on the driver's door or
Rpress the closing or lockin gbutton on the
trun klid
Vehicles with HANDS-FREE ACCESS:
It is also possible to stop the closing process by
performing akicking movementu nder the rear
bumper.
Opening and closing manually
Opening
XPress the Fbutton on the SmartKey.
The trun klid opens.
Closing
XPull the trun klid down using recess :and
push it closed.
XLock the vehicle if necessary with the &
button on the SmartKey or with KEYLESS-GO
(
Ypage 75).
Opening/closing automatically from
outside
Important safetyn otes
GWARNING
Parts of the body could become trapped dur-
ing automatic closing of the trun klid. More-
over, people, e.g. children,m ay be standing in
the closing area or may enter the closing area
during the closing process.T here isarisk of
injury.
Make sure that nobody is in the vicinity of the
closing area during the closing process.
Use one of the following option stostop the
closing process:
Rpress the Fbutton on the SmartKey.
Rpull or press the remoteo peratingswitch
on the driver's door.
Rpress the closing or lockin gbutton on the
trun klid.
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the
trun klid is open when the engin eisrunning,
Trunk83
Opening and closing
Z

especially if the vehicle is in motion.There is a
risk of poisoning.
Always switch off the engine before opening
the trun klid. Never drive with the trun klid
open.
Vehicles with HANDS-FREE ACCESS:
It is also possible to stop the closing process by
performing akicking movementu nder the rear
bumper.
!The trun klid swings upwards when opened.
Therefore, make sure that there is sufficient
clearanc eabove the trun klid.
The opening dimension softhe trun klid can be
found in the "Vehicle data" section
(
Ypage 349).
Opening automatically
You can open the trun klid automatically using
the SmartKey.
XPress and hold the Fbutton on the Smart-
Key until the trun klid opens.
Closing automatically
:Closing button
;Locking button
XPress closing button :in the trun klid. Vehicles with trunk lid remot
eclosing fea-
tur eand KEYLESS-GO: when the driver's door
is closed you can simultaneously close the trunk
lid and lock the vehicle. The KEYLESS-GO key
must be in the rear detection range of the vehi-
cle.
XPress lockin gbutton ;in the trun klid.
If KEYLESS-GO detect saSmartKey outside
the vehicle, the trun klid closes. The vehicle is
locked.
If KEYLESS-GO detect saSmartKey in the trunk,
the trun klid opens again after it is closed.
If KEYLESS-GO detect sasecondS martKey out-
side the vehicle, the trun klid remains closed.
If KEYLESS-GO detect saSmartKey in the trunk
before the closing procedure starts, the trun klid
remains open.
HANDS-FREE ACCESS
Important safety notes
GWARNING
The vehicle's exhaust system may be very hot. You could burn yourself by touchin gthe
exhaust system if you use HANDS-FREE
ACCESS. There is arisk of injury. Always
ensure that you only make the kicking move-
ment within the detection range of sensors.
!If the SmartKey is within the rear detection
range of KEYLESS-GO, the following situa-
tions, for example, could lead to the uninten-
tional opening of the trunk:
Rusing acar wash
Rusing apower washer
Make sure that the SmartKey is at least 10 ft
(3 m) away from the vehicle.
General notes
With KEYLESS-GO and HANDS-FRE EACCESS,
you can open or close the trun klid or stop the
procedure without using your hands. This is use- ful if you have your hands full. To do this, make
ak icking movementu nder the bumper with your
foot.
84Trunk
Opening and closing

Observe the following points:
RCarry your KEYLESS-GO key aboutyour per-
son. The KEYLESS-GO key must be in the rear
detection range of the vehicle.
RWhen making the kicking movement, make
sure that you are standing firmly on the
ground and that there is sufficient clearance
to the rear of the vehicle. You could otherwise
lose your balance e.g. on ice.
RAlwayse nsure that you only make the kicking
movement within the detection range of sen-
sors :.
RStand at least 12 in (30 cm) awayf rom the
rear area while doing so.
RDo not come into contact with the bumper
while making the kicking movement. Other-
wise, the sensors may not function correctly.
RHANDS-FREE ACCESS does not function
when the engine is started.
RDirt caused by road salt around sensors :
may restrict functionality.
Using the HANDS-FREE ACCESS with apros-
thetic leg may restrict functionality.
RIf aK EYLESS-GO key is within the rear detec-
tion range of KEYLESS-GO, HANDS-FREE
ACCESS could be triggered. The trunk lid
could thus be opened or closed unintention-
ally,f or example, if you:
-sit on the edge of the trunk.
-set something down or lift something up
behind the vehicle.
-polish the rear of the vehicle.
Do not carry the KEYLESS-GO key abouty our
person in these situations or in situations sim-
ilar to these. This will prevent the uninten-
tional opening/closing of the trunk.
Operation
XTo open/close: kick into sensor detection
range :under the bumper with your foot.
Aw arning tone will sound while the trunk lid is
opening or closing.
XIf the trunk lid does not open/close after
several attempts: wait at least ten seconds
and then using your foot kick under the
bumper again.
If you hold your foot under the bumper for too
long, the trunk lid does not open or close.
Repeatt he leg movement more quickly if this
occurs.
To stop the opening or closing procedure:
Rkick with your leg in the sensor detection
range :under the bumper or
Rpress the closing button on the trunk lid, or
Rpress the Fbutton on the SmartKey
If the trunk lid closing procedure has been stop-
ped:
Rmove your foot under the bumper againa nd
the trunk lid will open
If the trunk lid opening procedure has been
stopped:
Rmove your foot under the bumper againa nd
the trunk lid will close
Opening/closing automatically from
inside
Important safety notes
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the
Trunk85
Opening and closing
Z

trunk lidisopenw hent he engine is running,
especiall yifthe vehicl eisinmotion. There is a
ris kofp oisoning.
Alway sswitch off the engine befor eopening
the trunk lid. Never drive with the trunk lid
open.
GWARNING
The reversing featur edoesn ot respond:
Rto soft, light and thino bjects ,e.g.f ingers
Rove rthe last 1/3 in (8 mm) of the closing
movement
The reversing featur ecannot prevent some-
one being trapped in these situations in par-
ticular. There is ariskofi njury.
Make sure thatnob odyp arts ar einc lose
proximity durin gthe closing procedure.
If somebod ybecome strapped:
Rpress the Fbutton on the SmartKey, or
Rpull or press the remote operating switch
on the driver's door or
Rpress the closing or locking button on the
trunk lid
Vehicle swithH ANDS-FREE ACCESS:
It is also possibl etostop the closing proces sby
performing akicking movement under the rear
bumper.
!The trunk li dswing su pwar ds when opened.
Therefore ,makes uret hatt here is sufficient
clearance above the trunk lid.
The opening dimensions of the trunk li dcan be
found in the "Vehicl edata" section
(
Ypage 349).
Opening and closing
XTo open: pull remote operating switch :for
the trunk li duntilthe trunk li dopens.
XTo close: press and hol dremote operating
switch :for the trunk li duntilthe trunk li dis
completel yclosed.
When the vehicl eisstationary, yo ucan close the
trunk li dfromt he driver's seat. When the vehicle
is also unlocked, yo ucan also open the trunk lid
fromi nside.
Lockin gthe trunk separately
Youc an lock the trunk separately. If yo uthen
unlock the vehicl ecentrally ,the trunk remains
locked and cannot be opened.
Activating the functio ntolockt he trunk sepa-
rately:
XClose the trunk lid.
XOpen the glove box.
XPush the switch to position :.
If the vehicl eisunlocke dcentrally ,the trunk
remains locked.
iYo uc an also lock the glove box
(Ypage 269).
86Trunk
Opening and closing