2017 MERCEDES-BENZ C-Class COUPE battery

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

Deactivating the functiontolockt he trunk sep-
arately:
XOpen the glove box.
XPush the switch to position ;.
If the vehicl eisunlocke dcentrally, the trunk
will also be unlocked.
Trunk emergenc yrelease
Youc an unlock the trunk li dfromt he insid ewith
the emergency release button.
XPress emergency release button :briefly.
The trunk li dunlocks and opens.
The trunk li dcan be unlocke dwitht he trunk lid
emergency release when the vehicl eisstation-
ar yorw hiledriving.
The trunk li demergency release does not unlock
the trunk li difthe battery is disconnecte dor
discharged.
Trunk li demergency release light:
Remergency release button :flashe sfor
30 minute safter the trunk li disopened
Remergency release button :flashe sfor
60 minute safter the trunk li disclosed
Side windows
Important safety notes
GWARNING
Whil eopening the side windows ,bod yp arts
could become trapped between the side win-
do wa nd the door frame as the side window
moves .There is ariskofi njury.
Make sure thatn obodytouche sthe side win-
do wd uringt he opening procedure. If some-
body become strapped ,release the switch or
pull the switch to close the side windo wagain .
GWARNING
Whil eclosing the side windows ,bod yp arts in
the closing area could become trapped .There
is ar iskofi njury.
When closing make sure thatnop arts of the
body ar einthe closing area .Ifsomebody
become strapped ,release the switch or press
the switch to open the side windo wagain .
Side windo wreversin gfeature
The side windows ar eequippe dwithana uto-
matic reversing feature. If asolid object blocks
or restricts asidew indo wf romt raveling
upwards durin gthe automatic closing process,
the side windo wopens agai nautomatically. Dur-
ing the manua lclosing process, the side window
onl yopens agai nautomaticall yafter the corre-
sponding switch is released. The automatic
reversing featur eisonlyana idand is no substi-
tute for your attentio nwhenc losing asidew in-
dow.
GWARNING
The reversing featur edoesn ot react:
Rto soft, light and thino bjects ,e.g.s mall fin-
gers
Rwhil eresetting
Thi sm eans thatt he reversing featur ecannot
prevent someone being trapped in these sit-
uations. There is ariskofi njury.
Make sure thatnob odyp arts ar einc lose
proximity durin gthe closing procedure. If
someone become strapped ,press the switch
to open the side windo wagain .
Opening and closin gthe side win-
dows
The switches for the side windows ar eloc ated
on the driver's door. There is also aswitch for
the front-passenge rsidew indo wont he front-
passenge rdoor.
Side windows87
Openin gand closing
Z

The three red indicator lamps in the button indi-
cate the heating level you have selected.
The system automatically switches down from
level3to level 2after approximately eight
minutes.
The system automatically switches down from
level 2to level 1after approximately ten
minutes.
The system automatically switches off approx-
imately 20 minutes after it is set to level 1.
XTurn the SmartKey to position1or 2in the
ignition lock (Ypage 131).
XTo switch on: press button:repeatedly
until the desired heating level is set.
XTo switch off: press button:repeatedly
until all the indicator lamps go out.
iIf the battery voltage is too low, the seat
heating may switch off.
iIf drive program E(Ypage 144) is selected,
the power of the seat heating is reduced.
Switching the seat ventilation on/off
The three blue indicator lamps in the buttons
indicate the ventilation level you have selected.
XTurn the SmartKey to position 1or 2in the
ignition lock (Ypage 131).
XTo switch on: press button:repeatedly
until the desired ventilation level is set.
XTo switch off: press button:repeatedly
until all the indicator lamps go out.
iIf the battery voltage is too low, the seat
ventilation may switch off.
iYou can open the side windows and the slid-
ing sunroof using the "Convenienc eopening"
feature (
Ypage 88). The seat ventilation of
the driver's seat automatically switches to the
highest level.
iWhen the vehicle is stationary, the fan
speed can be reduced automatically. This
reduces the noises of the seat ventilation.
102Seats
Seats, steering wheel and mirrors

Problems with the seat heating or seat ventilation
ProblemPossible causes/consequences andMSolutions
The seat heating or seat
ventilation has switched
off prematurely or can-
not be switched on.The on-board voltage is too low because too many electrical consum-
ers are switched on.
XSwitch off electrical consumers that you do not need, such as the
rear window defroster or interior lighting.
Once the battery is sufficiently charged, the seat heating or seat
ventilation can be switched back on manually.
Steering wheel
Important safety notes
GWARNING
You could lose control of your vehicle if you do the following while driving:
Radjust the driver's seat, head restraint,
steering wheel or mirrors
Rfasten the seat belt
There is arisk of an accident.
Adjust the driver's seat, head restraint,s teer-
ing wheel and mirror and fasten your seat belt before startin gthe engine.
GWARNING
Children could injure themselves if they
adjust the steering wheel. There is arisk of
injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
The electrically adjustable steering wheel can
still be adjusted when there is no key in the igni-
tion lock.
Adjusting the steering wheel man-
ually
:Release lever
;Adjustst he steering wheel height
=Adjuststhe steering wheel position (fore-
and-aft adjustment)
XPush release lever :down completely.
The steering column is unlocked.
XAdjust the steering wheel to the desired posi-
tion.
XPush release lever :up completely.
The steering column is locked.
XCheck if the steering column is locked. When
doing so, try to push the steering wheel up or down or try to move it in the fore-and-aft
direction.
Steering wheel103
Seats, steering wheela nd mirrors
Z

dow defroster is switched on and the outside
temperature is low.
Folding the exterior mirrorsinorout
electrically
XTurn the SmartKey to position 1or 2in the
ignition lock (Ypage 131).
XBriefly press :.
Bothe xterior mirrorsf old in or out.
iMake sure that the exterior mirrorsa re
always folded out fully while driving .They
could otherwise vibrate.
iIf you are driving faster than 30 mph
(47 km/h), you can no longer fold in the exte-
rior mirrors.
Setting the exterior mirrors
If the battery has been disconnected or com-
pletely discharged, the exterior mirrorsm ust be
reset.T he exterior mirrorsw ill otherwise not
fold in when you select the Automatic
MirrorFoldingfunction in the multimedia system.
XTurn the SmartKey to position 1or 2in the
ignition lock (Ypage 131).
XBriefly press :.
Folding the exterior mirror sinorout
automatically
When the Automatic Mirror Foldingfunc-
tion is activated in the multimedia system (see
the separate operatin ginstructions):
Rthe exterior mirrorsf old in automatically as
soon as you lock the vehicle from the outside.
Rthe exterior mirrorsf old out automatically
again as soon as you unlock the vehicle.
iIf the exterior mirrorsh ave been folded in
manually, they do not fold out.
Exterior mirror pushed out of position
If an exterior mirror has been pushed out of
position ,proceed as follows:
XVehicles without electrically folding exte-
rior mirrors: move the exterior mirror into
the correct position manually.
XVehicles with electrically folding exterior
mirrors: press and hold button :until you
hear aclick and then the mirror engaging in
position (
Ypage 107).
The mirror housing is engaged again and you
can adjust the exterior mirrorsasu sual
(
Ypage 106).
Automatic anti-glare mirrors
GWARNING
Electrolyte may escape if the glass in an auto-
matic anti-glare mirror breaks. The electrolyte
is harmful and causes irritation. It must not
come int ocontact with your skin ,eyes, res-
piratory organs or clothing or be swallowed.
There is arisk of injury.
If you come int ocontact with the electrolyte,
observe the following:
RRinse off the electrolyte from your skin
immediately with water.
RImmediately rinse the electrolyte out of
your eyes thoroughly with clean water.
RIf the electrolyte is swallowed, immediately
rinse your mouth out thoroughly. Do not
induce vomiting.
RIf electrolyte comes int ocontact with your
skin or hair or is swallowed, seek medical
attention immediately.
RImmediately chang eout of clothing which
has come int ocontact with electrolyte.
RIf an allergic reaction occurs, seek medical
attention immediately.
Mirrors107
Seats, steering wheel and mirrors
Z

light switchtotheT position, the daytime
running lamps and parking lamps switc hon.
If the engin eisrunning and you turn the light
switc htotheL position, the manual settings
tak eprecedenc eover the daytime running
lamps.
USA only:
The daytime running lamps improve the visibility
of your vehicle duringt he day. To do this,the
daytime running lamps function must be
switched on using the on-board computer
(
Ypage 214).
If the engin eisrunning and you turn the light
switc htotheT orL position, the manual
settings tak eprecedenc eover the daytime run-
nin glamps.
Low-beam headlamps
Even if the light sensor does not detect that it is
dark,t he parking lamps and low-beam head-
lamps switc honwhen the ignition is switched on
and the light switc hisset to the Lposition.
This is aparticularly useful function in the event
of rain and fog.
XTo switch on th elow-beam headlamps:
turn the SmartKey in the ignition lock to posi-
tion 2or star tthe engine.
XTurn the light switc htotheL position.
The green Lindicator lamp in the instru-
mentc luster lightsu p.
Rear fog lamp
The rear fog lamp improves visibilityofy our
vehicle for the traffic behindint he eventofthick
fog. Please tak enoteoft he country-specific
regulations for the use of rear fog lamps.
XTo switch on th erearfog lamp: turn the
SmartKey in the ignition lock to position 2or
star tthe engine.
XTurn the light switc htotheL orÃ
position.
XPress the Rbutton.
The yellow Rindicator lamp in the instru-
mentc luster lightsu p.
XTo switch off th erearfog lamp: press the
R button.
The yellow Rin
dicator lamp in the instru-
mentc luster goes out.
Parking lamps
!If the battery charge is very low, the parking
lamps or standing lamps are automatically
switched off to enable the nex tengin estart.
Always park your vehicle safely and suffi-
ciently lit accordingtol egal standards. Avoid
using the parking lamps Toveraperiod of
several hours. If possible,s witchont he right-
hand X or left-hand Wstanding lamp.
XTo switch on: turn the light switc htothe
T position.
The green Tindicator lamp in the instru-
mentc luster lightsu p.
Standing lamps
Switchingonthe standing lamps ensures the
correspondin gside of the vehicle is illuminated.
XTo switch on th estanding lamps: the
SmartKey should not be in the ignition lock or
it should be in position 0.
XTurn the light switchtotheW (left-hand
side of the vehicle) or X((right-han dside
of the vehicle) position.
Combination switch
:High-beam headlamps
;Turn signal, right
=High-beam flasher
?Turn signal, left
XTo indicate briefly: press the combination
switc hbriefly to the pressure point in the
direction of arrow ;or?.
The correspondin gturn signal flashes three
times.
XTo indicate: press the combination switch
beyond the pressure point in the direction of
arrow ;or?.
Exterior lighting111
Lightsa nd windshield wipers
Z

Adaptive Highbeam Assist cannottake into
account road, weather or traffic conditions.
Adaptive Highbeam Assist is onlyana id.Y ou are
responsibl efor adjusting the vehicle's lighting
to the prevailing light, visibility and traffic con-
ditions.
In particular, the detection of obstacle scan be
restricte difthereis:
Rpoor visibility ,e.g.d ue to fog ,heavy rain or
snow
Rdirt on the sensors or the sensors are
obscured
Switchin gAdaptiv eHighbeam Assist
on/off
XTo switc hon:turn the light switch to Ã.
XPress the combinationswitch beyond the
pressure point in the direction of arrow :.
The _ indicator lamp in the multifunction
display lights up if it is dark and the light sen-
sor activates the low-bea mheadlamps.
If yo uaredriving at speed sabove 25 km/h:
If yo uaredriving at speed sabove approx-
imately16m ph (25 km/h):
The headlam prange is set automatically
depending on the distance between the vehi-
cle and othe rroa du sers.
If yo uaredriving at speed sabove approx-
imately1 9mph (30 km/h )and no othe rroad
users have been detected:
The high-bea mheadlamps ar eswitched on
automatically. The Kindicator lamp in the
instrument cluster also lights up.
If yo uaredriving at speed sbelow approx-
imately16m ph (25 km/h)orotherroa du sers
have been detecte dorthe roads ar eade-
quately lit:
The high-bea mheadlamps ar eswitched off
automatically. The Kindicator lamp in the
instrument cluster goe sout.T he_ indi-
cato rlam pint he multifunctio ndisplay
remains lit.
XTo switc hoff:move the combinatio nswitch
back to its norma lposition or move the light
switch to another position.
The _ indicator lamp in the ins trume
nt
cluster goe sout.
Headlamps fogged up on the inside
Certai nclimatic and physical conditions may
cause moisture to form in the headlamp. This
moisture does not affect the functionality of the
headlamp.
Interior lighting
Overvie wofinterior lighting
Front overhead controlp anel
:pSwitchest he left-hand front reading
lamp on/off
;| Switchest he automatic interio rlight-
ing contro lon/off
=c Switchest he front interio rlighting on/
off
?u Switchest he rearcompartment inte-
rio rlighting on/off
Ap Switchest he right-hand front reading
lamp on/off
Interior lighting control
General notes
In order to prevent the vehicle's battery from
discharging, the interio rlighting functions are
automaticall ydeactivated afte rsom etime
except when the SmartKeyisinp osition2in the
ignition lock.
The color, brightness and display lighting for the
ambient lighting ar eset using the multimedia
system (see the separate operating instruc-
tions).
Interior lighting113
Lights and windshield wiper s
Z