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

X
Position the trailer horizontally behind the
vehicle.
X Couple up the trailer.
X Establish the electrical connection between
the vehicle and the trailer.
X Check that the trailer lighting system is work-
ing.
X Push the combination switch upwards/down-
wards
X Check whether the corresponding turn signal
on the trailer is flashing.
Ac onnected trailer is only detected when the
electrical connection is established correctly
and when the lighting system is working prop- erly. The function of other systems, such as
ESP ®
,P ARKTRONIC, Active Parking Assist,
Active Blind Spot Assist or Lane Keeping
Assist also depends on this. Uncoupling
atrailer G
WARNING
If you uncouple atrailer with an engaged over-
run brake, you could trap your hand between
the vehicle and the trailer drawbar. This poses ar isk of injury.
Do not uncouple atrailer with an engaged
overrun brake. G
WARNING
Vehicles with level control:
If you disconnect the trailer cable, the vehicle is lowered. This can cause you or others to
become trapped between the vehicle body
and tyres, or underneat hthe vehicle. This
poses arisk of injury.
Make sure that no-one is in the immediate
vicinit yofthe wheel arch or underneat hthe
vehicle when disconnectin gthe trailer cable.
! Do not disconnect
atrailer with an engaged
overrun brake. Otherwise, your vehicle could
be damaged by the rebounding of the overrun
brake.
! Remove the installed adapter cable before
folding in the ball coupling. Otherwise, dam-
age may occur to the rear bumper and the
adapter cable. X
Make sure that the transmission is in position
P.
X Apply the electric parking brake.
X Secure the trailer against rolling away.
X Remove the trailer cable and decouple the
trailer. Trailer power supply
! You can connect accessories to the perma-
nent power supply up to amaximum of 240 W.
You cannot charge atrailer battery using the
power supply.
When it leaves the factory, your vehicle's trailer
socket is equipped with apermanen tpower
supply and apower supply that is switched on
via the ignition lock.
The permanen tpower supply is supplied via
trailer socket pin 9.
The power supply that is switched on via the
ignition lock is supplied via trailer socket pin 10.
The trailer's permanen tpower supply is
switched off in the event of low vehicle supply
voltage and after six hours at the latest.
You can find more information about fitting the
trailer electric sataqualified specialist work-
shop.
X To switch the connected power supply on
or off: turn the key to position 2or 0respec-
tively (Y page 145). Failure check for LEDs
If LED lamps are fitted in the trailer, amalfunc-
tion message may appear in the multifunction
display even if there is no fault. The reason for
the error message may be that the curren thas
fallen below the minimum of 50 mA.
To ensure reliable operation of the failure indi-
cator, each LED chain in the trailer lighting must
be guaranteed aminimum curren tof50mA. Trailer with 7-pin connector
General notes Trailer with 7-pin connector:
you can connect
to the 13-pin socket on the ball coupling using
an adapter or, if necessary, an adapter cable. Towing
atrailer
229Driving and parking Z

Displaying th
erange an dcurrent fuel
consumption Mercedes-AMG vehicles
:the men uonlyd is-
plays approximat erange :.
X Press òon thesteerin gwhee ltoo pent he
men ulist.
X Press :or9 on thesteerin gwhee lto
selec tthe Trip
Trip menu.
X Press 9or: to selec tthe display with
approximat erange :and curren tfue lcon-
sumption ;.
Approximat erange :that can be covered is
calculated accordin gtoyour curren tdriving
style and th eamount of fue linthetank .If
there is only asma ll amount of fue llef tint he
fue ltank, avehicle bein grefuelled C
appears instead of approximat erange :.
Recuperation display =shows you if energy
has bee nrecuperated from th ekinetic energy
in overrun mode and saved in th ebattery.
Recuperation display =depend sonthe
engin einstal led and is therefore no tavailable
in all vehicles.
ECO display The EC
Odisplay is no tavailable in Mercedes-
AM Gvehicles.
X Press òon thesteerin gwhee ltoo pent he
men ulist.
X Press :or9 on thesteerin gwhee lto
selec tthe Trip
Trip menu.
X Confir mbyp ressing aon thesteering
wheel.
X Press :or9 to selec tECO display.
If th eignition remain sswitched of ffor longer
than four hours, th eECO display will be auto-
matically reset. Further information on th
eECO display
(Y page 176).
Trip compute r"From start" or "From
reset" :
Distance
; Driving time
= Average speed
? Average fue lconsu mption
X Press òon thesteerin gwhee ltoo pent he
men ulist.
X Press :or9 on thesteerin gwhee lto
selec tthe Trip
Trip menu.
X Confir mbyp ressing aon thesteering
wheel.
X Press :or9 to select Froms tart
Fro ms tart or
Fro mr eset
Fro mr eset.
The values in the From
Fromstart
start submen uare cal-
culated from th estart of ajou rney whilst the
values in the Fromr eset
Fro mr eset submen uare calcu-
lated from th elast time th esubmen uwas reset
(Y page 238).
In th efollowin gcases th etripc om pute risa uto-
matically reset Froms tart
Fro ms tart:
R thei gnition has bee nswitched of ffor more
than four hours.
R 99 9h our shaveb eene xcee ded.
R 9,999 kilometres hav ebeene xcee ded.
Whe n9,999 hour sor99,99 9k ilometres have
bee nexcee ded, th etripc om pute risa utomati-
cally reset Fromr eset
Fro mr eset.
Digital speedometer X
Press òon thesteerin gwhee ltoo pent he
men ulist.
X Press :or9 on thesteerin gwhee lto
selec tthe Trip
Trip menu. Menus an
dsubmenus
237On-boardcompu tera nd displays Z

Display messages
Possible causes/consequences and
M
MSolutions !
Parkin
gbrake inop‐
Parkin gbrake inop‐
erative erative The yellow
!warning lamp lights up. The red !indicator lamp
flashes for about te nseconds after th eelectric parking brak ehas been
applie dorreleased. It then goe sout or remain slit.
The electric parking brak eismalfunctioning ,e.g.b ecause of over-
voltag eorundervoltage.
X Rectify th ecaus eoft heovervoltage or undervoltage, e.g. by charg-
ing th ebattery or restarting th eengine.
X Apply or release th eelectric parking brake.
If th eelectric parking brak estill canno tbeappliedorr eleased:
X Switc hoff th eignition and tur nitbacko n.
X Apply or release th eelectric parking brake.
If th eelectric parking brak estill canno tbereleased:
X Consult aqualified specialist workshop.
If it is still no tpossibl etoapply th eelectric parking brake:
X Consult aqualified specialist workshop. The yellow
!warning lamp lights up and th ered ! indicator
lamp flashes.
It is no tpossibl etoapply th eelectric parking brak emanually.
X Vehicles wit hmanua ltra nsmission: engage first gear.
X Vehicles wit hautomatic transmission: shift thetransmission to
position P.
X Consult aqualified specialist workshop. J
Check brake fluid Check brake fluid
level level There is insufficien
tbrak efluid in th ebrak efluid reservoir.
In addition ,the red J warning lamp lights up in th einstrument
cluste rand aw arning tone sounds.
G WARNING
Braking efficiency may be impaired.
There is ariskofana ccident.
X Pull ove rand stop th evehicl esafely as soo naspossible, paying
attention to roa dand traffic conditions. Do no tcontinue driving
under any circumstances.
X Safeguar dthe vehicl eagainst rollin gaway (Y page 172).
X Consult aqualified specialist workshop.
X Do no ttop up th ebrak efluid .This does no tcorrect thef ault. #
Check Check
brake
brakepad
padwear
wear The brak
epads/linings hav ereached their wear limit.
X Consult aqualified specialist workshop. G
Inoperative Inoperative On
eorm orem ain features of th eMercedes-Ben zContac tsystem are
malfunctioning.
X Consult aqualified specialist workshop. Display
messages
259On-boardcomputer an ddisplays Z

Display messages
Possible causes/consequences and
M
MSolutions ?
Coolan
tStopv ehi‐
Coolan tStopv ehi‐
cle Switch engine cle Switch engine
off off The coolan
tistoohot.
Aw arning tone also sounds.
G WARNING
Never drive wit hanoverheate dengine. Drivin gwhen your engin eis
overheate dcan caus esom efluid swhichm ay hav eleaked int othe
engin ecom partmen ttocatch fire.
In addition ,steam from an overheate denginec an caus eserious
burns, whic hcan occur jus tbyopening th ebonnet.
There is ariskofi njury.
X Stop th evehicl eimmediately, payin gattention to roa dand traffic
conditions, and switch off th eengine.
X Safeguar dthe vehicl eagainst rollin gaway (Y page 172).
X Wait until th eengineh as cooled down.
X Mak esuret hatthe air supply to th eenginer adiato risnotblocked,
e.g. by frozen slush.
X Do no tstart th eenginea gain until th edisplay message goe sout and
th ec oolan ttem perature is belo w120†. The engin emay otherwise
be damaged.
X Pay attention to th ecoolan ttem perature display.
If th etemperatur eincreases again:
X Consult aqualified specialist workshop immediately.
Under normal operating condition sand wit hthe specified coolant
level, th ecoolan ttem perature may ris eto1 20 †. #
See Owner'
sManual
See Owner' sManual The battery is no
tbein gcharged.
Aw arning tone also sounds.
Possibl ecauses:
R fault yalternator
R torn poly-V-belt
R am alfunction in th eelectronics
! Do no
tcontinue driving. The engin ecould otherwise overheat.
X Stop th evehicl eimmediately, payin gattention to roa dand traffic
conditions, and switch off th eengine.
X Safeguar dthe vehicl eagainst rollin gaway (Y page 172).
X Consult aqualified specialist workshop. Display
messages
267On-boardcomputer an ddisplays Z

Display messages
Possible causes/consequences and
M
MSolutions #
Sto
pv ehicl eSee
Sto pv ehicl eSee
Owner' sManual
Owner' sManual The battery is no longer bein
gcharged and th ebattery charg elevel is
to ol ow.
Aw arning tone also sounds.
X Stop th evehicl eimmediately, payin gattention to roa dand traffic
conditions, and switch off th eengine.
X Safeguar dthe vehicl eagainst rollin gaway (Y page 172).
X Observ ethe instruction sinthe# See SeeOwner's
Owner's Manual
Manualdisplay
message.
X Consult aqualified specialist workshop. #
Sto
pv ehicl eLeave
Sto pv ehicl eLeave
engine running engine running The battery charg
elevel is to olow.
X Pull ove rand stop th evehicl esafely as soo naspossible, paying
attention to roa dand traffic conditions. Do no tcontinue driving
under any circumstances.
X Start th eengine.
X Wait until th edisplay message disappear sbefore pullin gaway. #
Start engine See Start engine See
Owner'
sManual
Owner' sManual The engin
eisoff and th ebattery charg elevel is to olow.
X Switc hoff electrical consumer sthaty ou do no tneed, suc hasthe
rear window heating and interior lighting.
X Leav ethe engin erunnin gfor afew minutes, or drive for alonger
distance.
The battery charges. 4
Check Check
eng.
eng.oil
oillev.
lev.
when
when next
nextrefuelling
refuelling The engin
eoil level has dropped to th eminimum level.
Aw arning tone also sounds.
! Avoid lon
gjou rneys when there is to olittl ec oolan tint hecooling
system. Otherwise th eenginew ill be damaged.
X Chec kthe oil level when next refuelling, at th elatest (Y page 323).
X If necessary, to puptheengin eoil (Y page 323).
If you have to top up th eengin eoil frequently:
X Contac taqualified specialist workshop and hav ethe engine
checked.
Information on approve dengineo ils can be obtained from aqualified
specialist workshop or on th eInterne tath ttp:// bevo.mercedes-
benz.com. 268
Display
messagesOn-boardcomputer an ddisplays

Display messages
Possible causes/consequences and
M
MSolutions j
Check Check
trailer
trailer hitch
hitch
lock
lock The trailer to
whitch is no tcorrectly engaged.
Aw arning tone also sounds.
G WARNING
If th eball couplin gisnotengaged, th etrailer may come loose. There
is ar iskofana ccident.
X Stop th evehicl eimmediately, payin gattention to roa dand traffic
conditions, and switch off th eengine.
X Safeguar dthe vehicl eagainst rollin gaway (Y page 172).
X Engage th etrailer coupling's ball couplin gintheendp osition
(Y page 228). &
Function available Function available
again after engine again after engine
start start Vehicles wit
hthe BlueEFFICIENCY package:
Wit hthe engin eswitched off ,you hav eattempte dtoswitch on remote
activation of heating and ventilation systems mor ethant hree times.
X Let th eenginer un for te nseconds.
Afte rrunnin gthe engine, th epre-entry climat econtro lisopera-
tional again. &
inoperative inoperative
Battery
Battery
low
low th
eo n-bo ardv oltag eistoolow.
The auxiliary heating (Y page 138) has switched itself off .The auxiliary
heating or remot eactivation of heating and ventilation systems can-
no tbes witched on.
X Drive for aconsid erable distance.
The battery charges. The auxiliary heating or remot eactivation of
heating and ventilation systems is operational again as soo nasthe
on-boar delectrical system voltag eissufficient. &
inoperative Refuel inoperative Refuel
vehicle vehicle There is to
olittl efuel in th efuel tank. The auxiliary heating canno tbe
switched on (Y page 138).
X Refue lattheneares tfilling station. &
inoperative inoperative
See
SeeOwn‐
Own‐
er' sM an.
er' sM an. The auxiliary heating is temporarily malfunctioning or faulty.
X Whe nthe vehicl eisonal evel surfac eand th eengineh as cooled
down ,makeuptof oura ttempts to switch on th eauxiliary heating,
waiting several minute sbetween eac hattemp t(Y page 138).
If th eauxiliary heating does no tswitch on:
X Consult aqualified specialist workshop. 282
Display
messagesOn-boardcomputer an ddisplays

Key
Display messages
Possible causes/consequences and
M
MSolutions Â
Key Key
does
does not
notbelong
belong
to vehicle
to vehicle You hav
eput th ewrong ke yintheignition lock.
X Use th ecorrect key. Â
Replac
ekey
Replac ekey The ke
yneeds to be replaced.
X Consult aqualified specialist workshop. Â
Change Change
key
keybatteries
batteries The ke
ybattery is discharged.
X Replac ethe batterie s(Ypage 83). Â
Key not detected Key not detected
(whit
edisplay message) The ke
yiscurrentl yundetected.
X Change th elocation of th ekeyin th evehicle.
If th ekeystill canno tbedetected:
X Inser tthe keyintot he ignition loc kand tur nittot hedesire dposi-
tion. Â
Key not detected Key not detected
(re
dd isplay message) The ke
yisnotin th evehicle.
Aw arning tone also sounds.
If th eengineiss witched off ,you can no longer loc kthe vehicl ecen-
trally or start th eengine.
X Pull ove rand stop th evehicl esafely as soo naspossible, paying
attention to roa dand traffic conditions.
X Safeguar dthe vehicl eagainst rollin gaway (Y page 172).
X Locate th ekey.
X Press aon thesteering whee ltoc onfir mthedisplay message. Becaus
ethe re is interferenc efromas tron gs ource of radi owaves, the
ke yisn otdetecte dwhilstthe engin eisrunning.
Aw arning tone also sounds.
X Pull ove rand stop th evehicl esafely as soo naspossible, paying
attention to roa dand traffic conditions.
X Safeguar dthe vehicl eagainst rollin gaway (Y page 172).
X Inser tthe keyintot he ignition loc kand bring int okeymode. Â
Remove Remove
starting
starting but‐
but‐
ton,
ton, then
theninsert
insert key
key The ke
yiscontinually undetected.
The ke ydetection function has atem porar ymalfunction or is faulty. A
warning tone also sounds.
X Inser tthe keyintot he ignition loc kand tur nittot hedesire dposi-
tion.
X Consult aqualified specialist workshop. 284
Display
messagesOn-boardcomputer an ddisplays

i
You can remove the ashtray inser
tand use
the resulting compartmen tfor stowage.
Rear-compartment ashtray X
To open: pull cover ;out by its top edge.
X To remove th einsert: push ribbing =from
the left side and pull insert :upwards.
X To fit th einsert: fit insert :intot he holder
from above and press down int othe holder
until it engages. Cigarett
elighter G
WARNING
You can burn yourself if you touc hthe hot
heatin gelemen torthe socket of the cigarette
lighter.
In addition ,flammable materials can ignit eif:
R the hot cigarett elighter falls
R ac hild holds the hot cigarett elighter to
objects, for example
There is arisk of fire and injury.
Always hold the cigarett elighter by the knob.
Always make sure that the cigarett elighter is
out of reach of children. Never leave children unattended in the vehicle.
Your attention must always be focused on the
traffic conditions. Only use the cigarett elighter
when road and traffic condition spermit. Example
X Turn the key to position 2in the ignition lock
(Y page 145).
X To open: open the stowage compartment
(Y page 309).
X Press in cigarett elighter ;.
Cigarette lighter ;will pop out automatically
when the heatin gelemen tisred-hot.
X To close: push cover :of the stowage com-
partmen tclosed. 12
Vsockets
Genera lnotes X
Turn the key to position 1in the ignition lock
(Y page 145).
The sockets can be used for accessories with a
maximum draw of 180 W(15 A). Accessories
include such item sasmobile phon echargers.
If you use the sockets for long periods when the engin eisswitched off, the battery may dis-
charge.
An emergenc ycut-of fensures that the on-board
voltage does not drop too low. If the on-board
voltage is too low, the power to the sockets is
automatically cut .This ensures that there is suf-
ficient power to star tthe engine.
If you have connected adevic etot he 12 V
socket, leave the cover of the stowage com-
partmen topen. This prevent sthe cover from
being blocked. 316
FeaturesStowing and features

Problems with the 230
Vpower socket Problem
Possible causes/consequences and
M
MSolutions The warning lamp on the
230 Vpower socket is
not lit. The on-board voltage is too low because the battery is too weak.
X Start the engine.
or X Charge the battery (Y page 343).
If the indicator lamp still does not light up: X Consult aqualified specialist workshop. The temperature of the DC/AC converter is temporarily too high.
X Remove the electronic device connector from the 230 Vsocket.
X Let the DC/AC converter cool down.
If the indicator lamp still does not light up after the converter cools
down:
X Consult aqualified specialist workshop. You have connected an electronic device that has
aconstant nominal
power of less than 150 watts, but has avery high switch-on current.
This device will not work. If you connect such adevice, the 230 V
power socket will not supply it with power.
X Connect asuitable electronic device. Mercedes-Benz emergency call sys-
tem
Information on these requirements can be found in the separate multimedia system operating
instructions. X
To open: press cover :for at least one sec-
ond.
X To make an emergency call: press SOS but-
ton ;briefly.
The indicator lamp in SOS button ;flashes
until the emergency call is concluded. X
Wait for avoice connection to the Mercedes-
Benz emergency call centre.
X After the emergency call, close cover :.
You will see amessage if:
R ac onnection to the Mercedes-Benz emer-
gency call centre cannot be made
R ac all has not been automatically forwarded
to the public emergency call centre
In this case, dial the 112emergency number
on your mobile phone.
You can find more information on the Mercedes- Benz emergency call system in the separate
multimedia system operating instructions. Mercedes-Benz Contact
General notes Mercedes-Benz Contact offers fast assistance
at the touch of
abutton –around the clock. For
any queries about the vehicle, Mercedes-Benz
Contact offers afast and easy connecting call to
the Mercedes-Benz Customer Centre. You can, 318
FeaturesStowing and features

X
Turn cap :further anti-clockwise and
remove it.
If the coolant is at the level of marker bar =
in the filler neck when cold, there is enough
coolant in coolant expansion tank ;.
If the coolant level is approximately 1.5 cm
above marker bar =in the filler neck when
warm, there is enough coolant in coolant
expansion tank ;.
X If necessary, top up with coolant that has
been tested and approved by Mercedes-Benz.
X Replace cap :and turn it clockwise as far as
it will go.
Further information on coolant (Y page 376).
Topping up the windscreen washer sys- tem X
To open: pull cap:upwards by the tab and
open.
X Top up with the premixed washer fluid.
X To close: press cap :ontot he filler neck
until it engages.
If the washer fluid level drops below the recom- mended minimum of 1litre, amessage appears
in the multifunction display promptin gyou to
top up the washer fluid (Y page 283).
Further information on windscreen washer
fluid/antifreez e(Ypage 377). ASSYST PLUS
Service message
The ASSYST PLUS service interval display
inform syou of the next service due date.
Information on the type of service and service
intervals (see the separate Servic eBooklet). You can obtain further information from a
Mercedes-Benz Servic
eCentre.
i The ASSYST PLUS service interval display
does not show any information on the engine oil level. Observe the notes on the engine oil
level (Y page 323).
The multifunction display shows aservice mes-
sage for afew seconds, e.g.:
R Service AinXXd ays
Service AinXXd ays
R Service Adue
Service Adue
R Service Aoverdue by XX days
Service Aoverdue by XX days
Dependin gonthe operating conditions of the
vehicle, the remaining time or distance until the
next service due date is displayed.
The letter indicates which service is due. A A
stands for aminor service and B
Bfor am ajor ser-
vice. Anumber or another letter may be dis-
played after the letter.
Only for certain countries: the position after the
letter A
A or B Bindicates any necessary additional
maintenance work. If you notify aqualified spe-
cialist workshop of this display ,you will receive
as tatement on the associated costs.
The ASSYST PLUS service interval display does
not take into account any periods of time during which the battery is disconnected.
Maintaining the time-dependent service sched-
ule:
X Note down the service due date displayed in
the multifunction display before disconnect-
ing the battery.
or
X After reconnecting the battery, subtract the
battery disconnection periods from the ser-
vice date shown on the display. Hiding service messages
X Press the aor% button on the steering
wheel. Displaying service messages
X Switch the ignition on.
X Use ò on the steerin gwheel to call up the
list of menus. ASSYST PLUS
325Maintenance and care Z