2018 MERCEDES-BENZ SLC ROADSTER ECU

Display messagesPossible causes/consequences andMSolutions
The yellow!warning lamp lights up and th ered F (USAonly)
or ! (Canada only) indicator lamp flashes .
It is no tpossibl etoapply th eelectric parking brak emanually.
XShift th etransmission to position j.
XVisitaqualified specialist workshop .
$(USAonly)
J(Canada only)
Check Brake Fluid
Level
There is no tenough brak efluid in th ebrak efluid reservoir .
In addition ,the $ (USAonly) or J (Canada only) warning lamp
lights up in th einstrumen tcluste rand aw arning tone sounds.
GWARNIN G
The braking effec tmay be impaired.
There is ariskofana ccident.
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions. Do no tcontinue driving
under any circumstances.
XSecur ethe vehicl eagainst rollin gaway (Ypage 131).
XConsult aqualified specialist workshop .
XDo notadd brak efluid .This does no tcorrect them alfunction .
#
CheckBrakePadWear
The brak epads/linings hav ereached their wear limit.
XVisit aqualified specialist workshop .
G
Inoperative
Oneorm orem ain features of th embrace system are malfunctioning .
XHavethe mbrace system checke dataqualified specialist work-
shop.
PRE-SAFE Inopera‐tiv eSeeOperator' sManual
Importantfunction sofPRE-SAF E®havefailed. Al lother occupant
safet ysystems ,e.g.a ir bags ,remain available.
XVisit aqualified specialist workshop immediately.
ActiveBrakeAssistFunctionsCurrentlyLimite dSee Opera‐tor's Manual
Active Brake Assis tistemporarily inoperative.
Possibl ecauses are:
RThe radar sensor system is temporarily inoperative, e.g. due to
electromagneti cradiation emitted by nearby TV or radi ostation sor
other source sofelectromagneti cradiation .
RThe system is outside th eoperating temperature range.
RThe on-boar dvoltag eistoolow.
Whe nthe causes state dabov enol onger apply, th edisplay message
disappears.
Active Brake Assis tisoperational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 131).
XRestart th eengine.
184Display messages
On-boardc omputer andd isplays

Display messagesPossible causes/consequences andMSolutions
ActiveBrakeAssistFunctions LimitedSee Operator'sMan‐ual
Active Brake Assis tisunavailable due to amalfunction .
XVisitaqualified specialist workshop .
RadarSensorsDirtySee Operator' sMan‐ual
The radar sensor system is malfunctioning .
Possibl ecauses are:
RDirt on sensor s
RHeavy rain or snow
RWhendrivin goni nter-urban roads without traffic or infrastructure,
e.g. in desert-like area s
At least on edrivin gsystem or drivin gsafet ysystem is malfunctioning
or is temporarily unavailable :
RActive Brake Assist
RDistancePilotD ISTR ONIC
Once th ecaus eoft heproblem is no longer present, th edrivin gand
drive safet ysystems will be available again .The display message dis-
appears.
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 131).
XSwitc hoff th eengine.
XClean all sensor s(Ypage 242).
XRestart theengine.
The display message disappears.
6
SRSMalfunctionSer ‐viceRequired
The restrain tsystem is malfunctioning .The 6 warning lamp also
lights up in th einstrumen tcluster.
GWARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th eevent of an accident, may no tbetriggered .
There is an increased ris kofinjury.
XVisit aqualified specialist workshop immediately.
Fo rfurther information about th erestrain tsystem, see (
Ypage 38).
6
Front Lef tMalfunc‐tionServic eRequiredorFrontRight MalfunctionServic eRequired
The restrain tsystem has malfunctioned at th efront on th eleftorr ight.
The 6 warning lamp also lights up in th einstrumen tcluster.
GWARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th eevent of an accident, may no tbetriggered .
There is an increased ris kofinjury.
XVisit aqualified specialist workshop immediately.
Display messages185
On-boardc omputer andd isplays
Z

Display messagesPossible causes/consequences andMSolutions
6
LeftSideC urtai nAirbag MalfunctionServic eRequiredor
Right Sid eCurtai n
Airbag MalfunctionServic eRequired
There is amalfunction in th eleft-han dand/o rright-hand head bag.
The 6 warning lamp also lights up in th einstrumen tcluster.
GWARNIN G
The lef torright head bag may either be triggered unintentionally or, in
th ee vent of an accident, may no tbetriggered .
There is an increased ris kofinjury.
XVisit aqualified specialist workshop immediately.
186Display messages
On-boardc omputer andd isplays

Display messagesPossible causes/consequences andMSolutions
FrontPassengerAir‐bag Disabled SeeOperator' sManual
The front-passenger air bag and front-passenger knee bag are deac -
tivated during th ejou rney, although:
Ran adult
or
Rap erson of th ecorre spondin gstatur eisont hefront-passenger seat
If additional force sare applie dtotheseat ,the system may interpret
th eo ccupant's weigh taslower than it actually is.
GWARNIN G
The front-passenger fron tair bag and fron tpassenger knee bag may
no tbet riggered in th eevent of an accident.
There is an increased ris kofinjury.
XPull ove rand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 131).
XSwitc hthe ignition off .
XHavethe occupant on th efront-pa ssenger seat get out of th evehi-
cle .
XKee pthe seat unoccupied ,close th efront-pa ssenger door and
switch on th eignition .
XObserv ethe PASSENGER AI RBAG indicator lamp sinthecenter
console and th emultifunction display and chec kthe following:
Seat unoccupied and ignition switched on :
Raself-diagnosis is carrie dout.T he PASSENGER AI RBAG OFFa nd
PASSENGER AI RBAG ON indicator lamp smustligh tups imulta-
neousl yfor approximately six seconds
RtheP ASSENG ER AIRBAG OF Findicator lamp mus tthe nligh tup
and remain lit after th eself-diagnosis .Iftheindicator lamp is on ,
OCS has deactivated th efront-pa ssenger fron tair bag and front-
passenger knee bag (
Ypage 46)
RtheFront Passenger Airbag Enable dSee Operator' sManualorFront Passenger Airbag Disabled See Opera‐tor's Manualdisplay message smustn otbe shown in th emul-
tifunction display
XWait for aperiod of at least 60 seconds until th eneces sarysystem
checks hav ebeen completed.
XMak esuret hatthe display message sdonotappear in th emulti-
function display.
If these condition sare fulfilled ,the front-passenger seat can be occu-
pied again .Whether th ePASSENG ER AIRBAG OFForONi ndicator
lamp remain slit or goe sout depend sonhow OCS classifies th eoccu-
pant.
If th econditi onsa re no tfulfilled ,the system is no toperating correctly.
XVisit aqualified specialist workshop immediately.
Observ ethe additional information on OCS (
Ypage 46).
Display messages187
On-boardc omputer andd isplays
Z

Display messagesPossible causes/consequences andMSolutions
FrontPassengerAir‐bag Enable dSeeOperator' sManual
The front-passenger air bag and front-passenger knee bag are enabled
during th ejou rney, eve nthough :
Rachild, asmall adult or an objec tweighing less than th esystem' s
weigh tthreshold is locate donthefront-passenger seat
or
Rth ef ront-pa ssenger seat is unoccupied
The system may detec tobjects or force sapplyin gadditional weigh ton
th es eat .
GWARNIN G
The front-passenger fron tair bag and th efront-pa ssenger knee bag
may be triggered unintentionally.
There is an increased ris kofinjury.
XPull ove rand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 131).
XSwitc hthe ignition off .
XOpenthe front-passenger door .
XRemove thechild and th echild restrain tsystem from th efront -
passenger seat .
XMakesuret hatthe re are no objects on th eseat addin gtothe
weight.
The system might otherwise detec tthe additional weigh tand inter-
pre tthe seat occupant's weigh tasgreatertha nita ctually is.
XKeepthe seat unoccupied ,close th efront-pa ssenger door and
switch on th eignition .
XObserv ethe PASSENGER AI RBAG indicator lamp sinthecenter
console and th emultifunction display and chec kthe following:
Seat unoccupied and ignition switched on :
Raself-diagnosis is carrie dout.T he PASSENGER AI RBAG OFFa nd
PASSENGER AI RBAG ON indicator lamp smustligh tups imulta-
neousl yfor approximately six seconds
RtheP ASSENG ER AIRBAG OFFindicator lamp mus tthe nligh tup
and remain lit after th eself-diagnosis .Iftheindicator lamp is on ,
OCS (Occupant Classification System) has deactivated th efront -
passenger fron tair bag and front-passenger knee bag
(
Ypage 46)
Rth eFront Passenger Airbag Enable dSee Operator' sManualorFront Passenger Airbag Disabled See Opera‐tor's Manualdisplay message smustn otbe shown in th emul-
tifunction display
XWait for aperiod of at least 60 seconds until th eneces sarysystem
checks hav ebeen completed.
XMak esuret hatthe display message sdonotappear in th emulti-
function display.
If these condition sare fulfilled ,the front-passenger seat can be occu-
pied again .Whether th ePASSENG ER AIRBAG OFForONi ndicator
188Display messages
On-boardc omputer andd isplays

Engine
Display messagesPossible causes/consequences andMSolutions
?
CheckCoolantLevelSee Operator'sMan‐ual
The coolant levelistoolow.
!Avoid making longj ourneys with to olittle coolant in th eengine
cooling system. The engine will otherwise be damaged.
XAdd coolant ,observing th ewarning note sbefore doings o
(Ypage 235).
XIf you nee dtoadd coolant mor eoften than usual, have th eengine
coolant system checked at aqualified specialist workshop.
?The fan motor is malfunctioning.
XIf th ecoolant temperatur egage is below the Hmarking
(Ypage 164), driv eontothenex tqualified specialist workshop.
XAvoid heavyl oads on theengine as you do so, e.g .driving in moun-
tainous terrain and stop-and-go traffic.
?
CoolantT oo HotStopVehicleT urnEngine Off
The coolant is to ohot.
Aw arning tone also sounds.
GWARNING
Do no tdrivew hen your engine is overheated. This can caus esome
fluids whichm ay have leaked int othe engine compartmen ttocatch
fire.
Steam from th eoverheate dengine can also caus eserious burn swhich
can occur jus tbyopening th ehood.
Thereisar isk of injury.
XPull overand stop th evehicle safely and switch off th eengine ,pay-
ing attention to road and traffic conditions.
XSecure th evehicle against rolling away (Ypage 131).
XLeavet hevehicle and keep asafe distanc efromt hevehicle until the
engine has cooled down.
XMakes ure that th eair supply to th eengine radiator is no tblocked,
e.g .bys now, slush or ice.
XDo no tstart th eengine again until th edisplay message goes out and
th ec oolant temperatur egage is below the Hmarkin g(Ypage 164).
Otherwise, th eengine coul dbedamaged.
XPay attention to th ecoolant temperatur egage, observing th ewarn-
ing note s(Ypage 235).
XIf thetem peratur eincreases again,v isitaq ualified specialist work-
shop immediately.
Under normal operatin gconditionsa nd at thecorrec tcoolant level,
th ec oolant temperatur egage may rise to the Hmarking
(
Ypage 164).
190Displa ymessages
On-boardc omputer and displays

Display messagesPossible causes/consequences andMSolutions
#
See Operator'sMan‐ual
The battery is no tbein gcharged.
Aw arning tone also sounds.
Possibl ecauses are:
Rad efective alternato r
Ratornp oly-V-belt
Ram alfunction in th eelectronics
!Do no tcontinue driving. The engin ecould otherwise overheat.
XPull ove rand stop th evehicl esafely and switch off th eengine, pay-
ing attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 131).
XConsult aqualified specialist workshop .
#
StopVehicl eSeeOperator' sManual
The battery is no longer bein gcharged and th econditi on of charg eis
to ol ow.
Aw arning tone also sounds.
XPull ove rand stop th evehicl esafely and switch off th eengine, pay-
ing attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 131).
XObserv ethe instruction sinthe# See Operator' sManualdisplay message .
XConsultaqualified specialist workshop .
4
CheckEngineOilAtNextRefueling
The engin eoil level has dropped to th eminimum level.
Aw arning tone also sounds.
!Avoid lon gjou rneys wit htoo littl eengineo il. The engin ewill oth-
erwise be damaged.
XChec kthe oil level when next refueling, at th elatest (Ypage 234).
XIf necessary, add engin eoil(Ypage 235).
XHav ethe engin echecked ataq ualified specialist workshop if you
need to add engin eoil mor eoften than usual.
Information on approve dengineo ils can be obtained from aqualified
specialist workshop or on th eInterne tath ttp:// bevo.mercedes -
benz.com.
4
Check Engine OilLevel (Ad d1quart)
Mercedes-AMG SL C43:
The engin eoil level is to olow.
!Avoid lon gjou rneys wit htoo littl eengineo il. The engin ewill oth-
erwise be damaged.
XChec kthe oil level when next refueling, at th elatest (Ypage 234).
XIf necessary, add engin eoil(Ypage 235).
XHav ethe engin echecked ataq ualified specialist workshop if you
need to add engin eoil mor eoften than usual.
Information on approve dengineo ils can be obtained from aqualified
specialist workshop or on th eInterne tath ttp:// bevo.mercedes -
benz.com.
Display messages19 1
On-boardc omputer andd isplays
Z

Display messagesPossible causes/consequences andMSolutions
4
Engine Oil LevelLow StopVehicl eTurnEngine Off
Mercedes-AMG SL C43:
The engin eoil level is to olow.
There is ariskofe ngined amage.
XPull ove rand stop th evehicl esafely and switch off th eengine, pay-
ing attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 131).
XChec kthe engin eoil level (Ypage 234).
XIf necessary, add engin eoil(Ypage 235).
8
Fue lLevel Low
The fuel level has dropped int othe reserv erange.
XRefue lattheneares tgas station .
CThere is only averys mall amount of fuel in th efuel tank.
XRefue lattheneares tgas station without fail .
8
Gas Cap Loose
The fuel filler cap is no tclosed correctl yorthefuel system is leaking .
XCheckthatthe fuel filler cap is correctl yclosed .
If th efuelfiller cap is not correctl yclosed :
XClosethe fuel filler cap .
If th efuelfiller cap is correctl yclosed :
XVisitaqualified specialist workshop .
Ø
Check additive SeeOwner'sManual
The DE Ftankise mpty.
XHaveDEFrefilled as soo naspossibleataq ualified specialist work-
shop.
Ø
Remainingstarts :10
Awarning tone also sounds. The DE Fsystem is still malfunctioning .If
you switch off th eengine, th eenginew ill no trestart.
XVisit or consult aqualified specialist workshop immediately.
Ø
Remainingstarts :16
The DEFlevel has fallen to aminimum .
XHaveDEFrefilled as soo naspossibleataq ualified specialist work-
shop.
192Display messages
On-boardc omputer andd isplays