light MERCEDES-BENZ C-CLASS COUPE 2015 Owners Manual

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 PRE-SAFE Functions
PRE-SAFE Functions
limited limited
See
SeeOwner's
Owner's
Manual
Manual PRE
‑SAFE ®
PLU SorP RE‑SAFE ®
Brake is unavailable due to amal-
function .BAS PLU SwithC ross-Traffic Assis tmay also hav efailed.
X Consult aqualified specialist workshop immediately. Radar
Radar
sensors
sensors dirty
dirty
See Owner' sManual
See Owner' sManual At least on
eofthefollowin gdrivin gsystems or drivin gsafet ysystems
is temporarily restricted or inoperative:
R PRE-SAFE ®
PLUS
R PRE-SAFE ®
Brake
R COLLISION PREVENTION ASSIST PLUS
R Active Lan eKeepin gAssist
R Active Blind Spot Assist
R DISTRONI CPLUSw ithS teering Assis tand Stop&Go Pilot
If th eradar sensor system in fron tisdirty, Active Blind Spot Assis twill
no tp erfor mac ourse-correcting brak eapplication.
Possibl ecauses:
R thes ensor sintheradiato rtrima nd/o rinthebumpers are dirty
R thef unction of th edrivin gsystem or drivin gsafet ysystem is
impaire ddue to heav yrain or snow
Aw arning tone also sounds.
Once th ecauses listed abov enolonger apply, th edisplay message
goe sout.A lldrivin gsystems or drivin gsafet ysystems are operative
again.
If th edisplay message does no tdisappear:
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 Switc hoff th eengine.
X Clean th esensor s(Ypage 330) in th efollowin glocations:
R in th eradiato rtrim
R in th efront bumper
R in th erear bumper, particularly in th emiddle of th erear bumper
X Restart th eengine.
The display message disappears. 6
Restraint sys
.mal‐
Restraint sys .mal‐
function Consult function Consult
workshop workshop The restrain
tsystem is faulty. The 6warning lamp also lights up in
th ei nstrumen tcluster.
G WARNING
The airbags or belt tensioners may either be triggered unintentionally or, in th eevent of an accident, may no tbetriggered.
This poses an increased ris kofinjury.
X Consult aqualified specialist workshop immediately.
Fo rfurther information about th erestrain tsystem, see (Y page 39). Display
messages
261On-boardcomputer an ddisplays Z

Display messages
Possible causes/consequences and
M
MSolutions 6
Front lef
tmalfunc‐
Front lef tmalfunc‐
tio nC onsul twork‐
tio nC onsul twork‐
shop shop orFront right
Front right
malfunction
malfunction Consult
Consult
workshop
workshop The restrain
tsystem has malfunctioned at th efront on th eleftorr ight.
The 6 warning lamp also lights up in th einstrumen tcluster.
G WARNING
The airbags or belt tensioners may either be triggered unintentionally or, in th eevent of an accident, may no tbetriggered.
This poses an increased ris kofinjury.
X Consult aqualified specialist workshop immediately. 6
Rea
rl eftm alfunc‐
Rea rl eftm alfunc‐
tio nC onsul twork‐
tio nC onsul twork‐
shop shop orRea rr ight
Rea rr ight
malfunction
malfunction Consult
Consult
workshop
workshop The rear left-han
dorright-hand restrain tsystem has malfunctioned.
The 6 warning lamp also lights up in th einstrumen tcluster.
G WARNING
The airbags or belt tensioners may either be triggered unintentionally or, in th eevent of an accident, may no tbetriggered.
This poses an increased ris kofinjury.
X Consult aqualified specialist workshop immediately. 6
Lef
tw indowbag mal‐
Lef tw indowbag mal‐
function Consult function Consult
workshop workshop orRight
Right
windowbag malfunc‐
windowbag malfunc‐
tio nC onsul twork‐
tio nC onsul twork‐
shop shop The lef
torright windowbag is malfunctioning.
The 6 warning lamp also lights up in th einstrumen tcluster.
G WARNING
The lef torright windowbag may either be triggered unintentionally or,
in th eevent of an accident, may no tbetriggered.
This poses an increased ris kofinjury.
X Consult aqualified specialist workshop immediately. 262
Display
messagesOn-boardcomputer an ddisplays

Display messages
Possible causes/consequences and
M
MSolutions Further information on th
eautomatic front-passenger fron tairbag
deactivation feature (Y page 47).Lights
Display messages
Possible causes/consequences and
M
MSolutions b
Lef
td ipped beam
Lef td ipped beam
(Example) The correspondin
gbulb is faulty.
X Consult aqualified specialist workshop.
or X Chec kwhether you are permitte dtoreplace th ebulb yourself
(Y page 123).
i LE
Dl igh tbulbs :the display message for th ecorre spondin glamp
only appear swhen all th eLEDsint helamp hav efailed. b
Active Active
Light
LightSystem
System
inoperative
inoperative The active ligh
tfunction is faulty.
X Consult aqualified specialist workshop. b
Intell
.Light Sys‐
Intell .Light Sys‐
tem inoperative tem inoperative The Intelligent Light Syste
misfaulty. The lighting system continues to
function properly without th efunction softheIntelligent Light System.
X Consult aqualified specialist workshop. b
Malfunction Malfunction
See
SeeOwn‐
Own‐
er' sM anual
er' sM anual The exterio
rlighting is faulty.
X Consult aqualified specialist workshop. Vehicles wit
htrailer to whitch :af usem ay hav eblown.
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 Chec kthe fuses (Y page 350).
X If necessary, replace th eblown fuse. Observ ethe warning note sas
you do so.
If th edisplay message continues to be displayed:
X Consult aqualified specialist workshop. b
AUT
Ol ights inoper‐
AUT Ol ights inoper‐
ative ative The ligh
tsensor is faulty.
X Consult aqualified specialist workshop. b
Switch off lights Switch off lights You are leaving th
evehicl eand th elights are switched on .Awarning
tone also sounds.
X Turn th eligh tswitch to the Ãposition. Display
messages
265On-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 ¨
Sto
pv ehicl eVehi‐
Sto pv ehicl eVehi‐
cle too low cle too low You hav
epulled away while th evehicl elevel is still to olow.
AIRMATIC set sthe vehicl etotheselected level after ashort period.
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 Wait until th edisplay message disappear sbefore pullin gaway. AIRMATIC is faulty.
Awarning tone also sounds.
X Do no tdrive at speeds abov e80km/h.
X Mak eonlys light steering movements. Otherwise ,the fron twings or
th et yres could be damaged if th esteering movement is to ogreat.
X Liste nfor scraping sounds.
X Pull ove rand stop th evehicl esafely, payin gattention to roa dand
traffic conditions, and set ahigher vehicl elevel.
Dependin gonthemalfunction ,itmay be possibl etoraisethe vehi-
cle.
X Consult aqualified specialist workshop. ¨
Malfunction Malfunction The AIRMATIC function is restricted. The vehicle's handlin
gcharac-
teristics may be affected.
X Do no tdrive at speeds abov e80km/h.
X Consult aqualified specialist workshop. Lane
Lane
Keeping
Keeping Assist
Assist
currently unavaila‐
currently unavaila‐
ble ble See
SeeOwner's
Owner's Man‐
Man‐
ual
ual orActive Lane
Active Lane
Keepin gAssist cur‐
Keepin gAssist cur‐
rently unavailable
rently unavailable
See Owner' sManual
See Owner' sManual Lan
eKeepin gAssistorA ctiveLaneK eepin gAssistisd eactivated and
temporarily inoperative.
Possibl ecauses:
R thew indscree nisdirty in th ecamera' sfield of vision
R visibilit yisimpaire ddue to heav yrain ,sno worf og
R there hav ebeen no lan emarking sfor an extended period
R thel an em arking sare worn, dark or covered, e.g. by dir torsnow
Once th ecauses listed abov enolonger apply, th edisplay message
goe sout.
Lan eKeepin gAssistorA ctiveLaneK eepin gAssistiso perational
again.
If th edisplay message does no tdisappear:
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 Clean th ewindscreen. Lane Lane
Keeping
Keeping Assist
Assist
inoperative
inoperative or
Active
Active Lane
Lane Keeping
Keeping
Assist inoperative
Assist inoperative Lan
eKeepin gAssistorA ctiveLaneK eepin gAssistisf aulty.
X Consult aqualified specialist workshop. Display
messages
271On-boardcomputer an ddisplays Z

Display messages
Possible causes/consequences and
M
MSolutions Ð
Power steering mal‐ Power steering mal‐
function See Own‐ function See Own‐
er'
sM anual
er' sM anual The powe
rsteering assistanc eisfaulty.
Aw arning tone also sounds.
G WARNING
You will need to use mor eforce to steer.
There is ariskofana ccident.
X Chec kwhether you are able to apply th eextra force required.
If you ar eabletos teer safely:
X Drive on carefully.
X Consult aqualified specialist workshop immediately.
If you ar eunable to steer safely:
X Do no tdrive on.
X Consult aqualified specialist workshop. Ð
Steering malfunc‐ Steering malfunc‐
tio
nS ee Owner's
tio nS ee Owner's
Manual Manual Vehicl
ewithm anual transmission :the electric steering loc kismal-
functioning.
G WARNING
The steering may be locke dbytheelectric steering lock.
There is ariskofana ccident.
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 Do no tdrive on.
X Consult aqualified specialist workshop. _
Before Before
starting
starting the
the
engine ,turnt he
engine ,turnt he
steering wheel.
steering wheel. Vehicl
ewithm anual transmission :the electric steering loc kismal-
functioning.
X Remove th ekeyfrom th eignition lock.
X To unloc kthe steering ,movet he steering whee lslightly.
X Inser tthe keyintot he ignition loc kagain. Telephone Telephone
No
Noservice
service Your vehicl
eisoutside th enetwork provider' stransmitter/receiver
range.
X Wait until th emobile phone operational readiness symbol appears
in th emultifunction display. ¥
Top up washer fluid Top up washer fluid The washer flui
dlevel in th ewasher flui dreservoir has dropped below
th em inimum.
X Top up th ewasher flui d(Ypage 325). Display
messages
283On-boardcomputer an ddisplays Z

Warning and indicator lamps in the instrument cluster
General notes
Some systems carry out aself-diagnosis when the ignition is switched on. Severa lwarning and
indicator lamps can thereby temporarily light up or flash. This behaviou risnon-critical. These
warning and indicator lamps only indicate amalfunction if they light up or flas hafter the engine is
started or during ajourney. Safety
Seat belts Warning/
indicator
lamp
N N
Signal type
Possibl ecauses/consequencesa ndM
MSolutions ü
N
Only for certain countries :the red sea tbeltw arning lam plights up for 6seconds
after the engine starts.
The sea tbeltw arning lam preminds the drive rand front passenger to fasten their
sea tbelts.
X Fasten you rseatb elt( Y pag e43). ü
N
Only for certain countries :the red sea tbeltw arning lam plights up after the
engine starts. In addition, awarning tone sound sfor up to 6seconds.
The driver's sea tbeltisn ot fastened.
X Fasten you rseatb elt( Y pag e43).
The warning tone ceases. ü
N
The red sea tbeltw arning lam plights up after the engine starts, as soon as the
driver's or the front-passenger door is closed.
The drive rorpassenger has not fastened their sea tbelt.
X Fasten you rseatb elt( Ypag e43).
The warning lam pgoes out.
There are objects on the front-passenger seat.
X Remove the objects from the front-passenger sea tand stow them in asecure
place.
The warning lam pgoes out. ü
N
The red sea tbeltw arning lam pflashes and an intermittent audible warning
sounds.
The drive rorpassenger has not fastened their sea tbelt. At the same time, you are
driving faster than 25 km/h or have briefly drive nfaster than 25 km/h.
X Fasten you rseatb elt( Y pag e43).
The warning lam pgoes out and the intermittent warning tone ceases.
There are objects on the front-passenger seat. At the same time, you are driving
faster than 25 km/h or have briefly drive nfaster than 25 km/h.
X Remove the objects from the front-passenger sea tand stow them in asecure
place.
The warning lam pgoes out and the intermittent warning tone ceases. Warning and indicator lamps in the instrument cluster
285On-board computer and displays Z

Safety systems
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions J
N
The yellow brake system warning lamp lights up while the engine is running or
the ECO start/stop function is activated.
G WARNING
The brake system is malfunctioning and the braking characteristics may be affec- ted.
There is arisk of an accident.
X If the multifunction display shows adisplay message, please observe this.
X Drive on carefully.
X Consult aqualified specialist workshop immediately. J
N
The red brake system warning lamp is lit while the engine is running.
Aw arning tone also sounds.
G WARNING
The brake boosting effect is malfunctioning and the braking characteristics may be
affected.
There is arisk of an accident.
X Pull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances.
X Safeguard the vehicle against rolling away (Y page 172).
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction display. J
N
The red brake system warning lamp is lit while the engine is running.
Aw arning tone also sounds.
There is insufficient brake fluid in the brake fluid reservoir.
G WARNING
Braking efficiency may be impaired.
There is arisk of an accident.
X Pull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances.
X Safeguard the vehicle against rolling away (Y page 172).
X Do not top up the brake fluid. Topping up will not rectify the fault.
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction display. 286
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Warning/
indicator
lamp
N N
Signal type
Possiblec auses/consequences and M
MSolutions !
N
The yellow ABS warning lamp is lit while the engine is running.
ABS (Anti-lock Braking System) is faulty.
An additiona lwarning tone indicates that EBD (electronic brake force distribution)
is faulty.
Other driving and driving safety systems may alsobef aulty.
G WARNING
The brake system continues to function normally, but without the functions listed above. The front and rear wheels coul dtherefore lock, for example, if you brake
hard.
The steerability and braking characteristics may be severely affected. The braking
distance may increas einanemergency braking situation.
If ESP ®
is not operational ,ESP ®
is unable to stabilise the vehicle.
There is an increased dange rofskidding and risk of an accident.
X Observe the additiona ldisplay messages in the multifunction display.
X Drive on carefully.
X Consult aqualified specialist worksho pimmediately.
If the ABS control unit is faulty, there is alsoap ossibility that other systems,such
as the navigation system or the automatic transmission, willbeu navailable.J÷
!
N
The red brake system warning lamp and the yellow ESP ®
and ABS warning lamps
light up while the engine is running.
ABS and ESP ®
are faulty.
Other driving and driving safety systems may alsobef aulty.
G WARNING
The brake system continues to function normally, but without the functions listed above. The front and rear wheels coul dtherefore lock, for example, if you brake
hard.
The steerability and braking characteristics may be severely affected. The braking
distance may increas einanemergency braking situation.
If ESP ®
is not operational ,ESP ®
is unable to stabilise the vehicle.
There is an increased dange rofskidding and risk of an accident.
X Observe the additiona ldisplay messages in the multifunction display.
X Drive on carefully.
X Consult aqualified specialist worksho pimmediately. Warning and indicator lamps in the instrument cluster
287On-board computer and displays Z