2019 MERCEDES-BENZ CLA COUPE check engine light

Only
replace abattery withabattery thathas
been recommended byMercedes-Benz .
Remove theSmartKey ifyou park thevehicle
and donot require anyelectrical consumers.
The vehicle willthen usevery little energy, thus
conserving batterypower.
If the power supply hasbeen interrupted, e.g.if
you reconnec tthe battery, youwillhave to:
R set the clock using themultimedia system
(see theDigital Operator's Manual)
R reset thefunction forfolding theexterior mir-
rors in/out automaticall y,by folding themir-
rors outonce (Ypage 98) Charging
thebatter y G
WARNING
During charging andjump-startin g,explosive
gases canescape fromthebattery. Thereisa
risk ofan explosion.
Particularl yavoid fire,open flames, creating
sparks andsmoking. Ensurethereissufficient
ventilation whilecharging andjump-startin g.
Do not lean over abattery. G
WARNING
Battery acidiscaustic. Thereisarisk ofinjury.
Avoid contactwith skin, eyesorclothing. Do
not inhale anybattery gases.Donot lean over
the battery. Keepchildren awayfrom batter-
ies. Wash awaybattery acidimmediately with
plenty ofclean water andseek medical atten-
tion. G
WARNING
A discharged batterycanfreeze attempera-
tures below freezing point.Whenjump-start-
ing the vehicle orcharging thebattery, gases
can escape fromthebattery. Thereisarisk of
an explosion.
Allow thefrozen battery tothaw outbefore
charging itor jump-startin g.
! Only
usebattery chargers withamaximum
charging voltageof14.8 V.
! Only
charge thebattery usingthejump-
starting connectionpoint. The
jump-startin gconnec tionpoint isin the
engine compartment (Ypage 282).
X Open thehood.
X Connect thebattery charger tothe positive
terminal andground pointinthe same order
as when connec tingthedonor battery inthe
jump-startin gprocedure (Ypage 282).
If the <004C00510047004C004600440057005200550012005A004400550051004C0051
004A[ lampsdonot light upin
the instrument clusteratlow temperatures, itis
very likely thatthedischarged batteryhasfro-
zen. Inthis case youmay neither jump-start the
vehicle norcharge thebattery. Theservice lifeof
a thawed-out batterymaybeshorter. Thestart-
ing characteristics canbeimpaired ,particularl y
at low temperatures. Havethethawed-out bat-
tery checked ataqual ified speciali stworkshop.
Only charge theinstalled batterywithabattery
charger whichhasbeen tested andapproved by
Mercedes-Benz .A battery charger unitspeciall y
adap tedforMercedes-Benz vehiclesandtested
and approved byMercedes-Benz isavail able as
an accessory. Itpermits thecharging ofthe bat-
tery inits installed position. Contactanauthor-
ized Mercedes-Benz Centerforfurther informa-
tion andavail ability. Read thebattery charger's
operating instructionsbefore charging thebat-
tery. Replacing
the12Vbatter y
Observe thenotes onthe 12Vbattery
(Y page 279).
Mercedes-Benz recommendsthatyouhave the
12 Vbattery replaced ataqual ified speciali st
workshop, e.g.atan authorized Mercedes-Benz
Center.
If you want toreplace thebattery yourself,
observe thefollowi ngnotes:
R Alway sreplace adefective batterywithabat-
tery which meets thespecific requirements of
the vehicle.
The vehicle isequip pedwith abattery using
AGM (absorbe ntglass mat)technology ora
battery usingEFB(enhanced floodedbattery)
technology. Fullvehicle functionality isguar-
anteed onlywith anAGM orEFB battery. If
replacement isnecessary, alwaysuse thebat-
tery technology originallyinstalled. Switching
between thebattery technologies isnot per-
mitted. Forsafety reasons, Mercedes-Benz
recommends thatyouonly usebatteries Bat
tery (vehic le)
281Breakdown assistance Z

If
the indicator/wa rninglampsdo not light upinthe instrument clusteratlow temperature s,itis very
likely thatthedischa rgedbattery hasfrozen. Inthis case youmay neither jump-start thevehicle nor
charge thebattery. Letthe battery thawfirst.Theservice lifeofathawed -outbattery maybeshorter.
The starting characteristics canbeimpa ired,particul arlyatlow temperature s.Have thethawed -out
battery checked ataqua lifiedspecia listworkshop.
Do not start thevehicle usingarapi dcharging device.Ifyou rvehicle 'sbattery isdischa rged,the
engine canbejump-started fromanother vehicleorfrom asecond batteryusingjumper cables.
Observe thefollow ingpoints:
R The battery isnot accessib lein all vehicle s.Ifthe other vehicle 'sbattery isnot accessib le,jump-
start thevehicle usingasecond batteryorajump-starting device.
R You may onlyjump-start thevehicle whentheengine andexhau stsystem arecold.
R Do not start theengine ifthe battery isfrozen. Letthe battery thawfirst.
R Only jump-start frombatteries witha12 Vvoltage rating.
R Only usejumper cablesthat arenot dama gedand have asufficie ntcross-section andinsula ted
terminal clamps.
R Make surethatthetwo vehicle sdo not touch.
Make surethat:
R The jumper cablesare not dama ged.
R Non-insula tedparts ofthe terminal clampsdonot come intocontact withother metal partswhile
the jumper cablesare connected tothe battery.
R The jumper cablescannot comeintocontact withparts thatcanmove whentheengine isrunning,
such asthe V-belt pulley orthe fan.
X Secure thevehicle byappl ying theelectric parking brake.
X Shift thetransmission topositio n005D.
X Turn theSmartKey topositio n005A inthe ignition lockandremove it.
X Switch offallelectrical consumers, e.g.rear window defroster, lighting,etc.
X Open thehood. Jump-st
arting
283Breakd ownassis tance Z

Position
number0084identifies thecharged batteryofthe other vehicle oran equivalent jump-starting
device.
X Press togethercover 0043ofpositive clamp0044and slide itback.
X Connec tpositive terminal0044 onyour vehicle topositive terminal0087 ofdonor battery 0084using the
jumper cable,beginnin gwith your ownbattery.
X Start theengine ofthe donor vehicle andrunitat idling speed.
X Connec tnegative terminal0085 ofdonor battery 0084toground point0083ofyour vehicle usingthe
jumper cable,connectin gthe jumper cabletobattery ofother vehicle 0084first.
X Ifthe battery isfully discharged, leavethebattery thatisbeing usedtojump-st artconn ected for
a few minutes beforeattemptingtostart .This charges thebattery slightly.
X Start theengine.
X Before disconn ectingthe jumper cables,letthe engine runforseveral minutes.
X First ,remove thejumper cablesfromground point0083and negative terminal0085, then from pos-
itive termin al0044 and positive terminal0087. Begin eachtimeatthe cont acts onyour ownvehicle
first.
X Close cover0043ofpositive terminal0044 after removin gthe jumper cables.
X Close thehood.
X Have thebattery checkedataqualified specialist workshop.
i Jump-start
ingisnot cons idered tobe anormal operating condition.
i Jumper
cablesandfurther informationregarding jump-startingcanbeobtained atany qualified
specialist workshop. Towing
andtow-sta rting Impor
tantsafety notes G
WARNIN
G
Funct ionsrelevant tosafety arerestr icted or
no longer availabl eif:
R the engine isnot runnin g
R the brake system orthe power steerin gis
malfunct ioning
R there isamalfunct ioninthe power supply
or the vehicle's electricalsystem
When yourvehicle istowed awayortowed
start ed,you may require considerably more
effort tosteer andbrake. Thereisarisk ofan
accident .
In such cases, useatow bar. Before being
towed awayortow start ed,make surethe
steerin gmoves freely. G
WARNIN
G
You cannolonger steerthevehicle ifthe
steerin gwheel lockhasbeen engaged. There
is arisk ofan accident .
Always switchoffthe ignition whentowing the
vehicle withatow cable oratow bar. G
WARNIN
G
When towing ortow-st arting another vehicle
and itsweight isgreater thanthepermissible
gross weight ofyour vehicle, the:
R the towing eyecould detach itself
R the vehicle/t railercombinat ioncould roll-
over.
There isarisk ofan accident .
When towing ortow-st arting another vehicle,
its weight should notbegreater thantheper-
missible grossweight ofyour vehicle.
Det ails onthe permissible grossvehicle weight
of your vehicle canbefound onthe vehicle iden-
tificat ionplate (Ypage 318). 284
Towing
andtow-sta rtingBr eakdown assistance