2018 MERCEDES-BENZ CLA COUPE jump start

Remove theSmartKey if you park th evehicl e
and do no trequire any electrical consumers.
The vehicl ewill then use ver ylittl ee nergy, thus
conserving battery power .
If th epower suppl yhas been interrupted, e.g. if
you reconnect th ebattery, you will hav eto:
Rset th eclock usin gthe multimedia system;
see th eseparat eoperating instruction s
Rreset thefunction for foldin gthe exterio rmir-
ror sin/out automatically, by foldin gthe mir -
ror so ut once (
Ypage 97)
Charging th ebattery
GWARNIN G
During charging and jump-starting ,explosive
gase scan escape from th ebattery. There is a
ris kofane xplosion .
Particularly avoi dfire, open flames, creating
sparks and smoking. Ensur ethe re is sufficien t
ventilation while charging and jump-starting .
Do no tlean ove rabattery.
GWARNIN G
Battery acid is caustic. There is ariskofi njury.
Avoid contact wit hskin, eyes or clothing .Do
no tinhale any battery gases. Do no tlean ove r
th eb attery. Kee pchildren away from batter-
ies. Wash away battery acid immediately wit h
plenty of clean water and seek medical atten -
tion .
GWARNIN G
Ad ischarged battery can freez eattempera-
tures belo wfreezing point. When jump-start -
ing thevehicl eorc harging th ebattery, gase s
can escape from th ebattery. There is arisko f
an explosion .
Allow th efroze nbattery to thaw out before
charging it or jump-starting .
!Only use battery chargers wit hamaximum
charging voltag eof14.8V .
!Only charge th ebattery usin gthe jump-
starting connection point.
The jump-starting connection poin tisinthe
engin ecom partmen t(
Ypage 278).
XOpen thehood.
XConnect th ebattery charge rtothepositive
termina land ground poin tinthesam eorder
as when connecting th edonor battery in th e
jump-starting procedure (
Ypage 278).
If th eindicator/warning lamp sdonotligh tupi n
th ei nstrumen tcluste ratlow temperatures ,itis
ver ylikely that th edischarged battery has fro-
zen. In this cas eyou may neither jump-start th e
vehicl enorcharge th ebattery. The servic elife of
at hawed-out battery may be shorter. The start -
ing characteristics can be impaired, particularly
at low temperatures .Havet he thawed-out bat -
tery checke dataqualified specialist workshop.
Only charge th einstalled battery wit habattery
charge rwhic hh as been tested and approve dby
Mercedes-Benz .Abattery charge runi
ts p
ecially
adapted for Mercedes-Benz vehicles and tested
and approve dbyMercedes-Benz is available as
an accessory. It permit sthe charging of th ebat-
tery in it sinstalled position .Contac tana uthor-
ized Mercedes-Benz Cente rfor further informa-
tion and availability. Read th ebattery charger's
operating instruction sbefore charging th ebat-
tery.
Jump-starting
Fo rthe jump-starting procedure ,use only th ejump-starting connection point, consisting of apos-
itive termina land aground point, in th eenginec om partment.
GWARNIN G
Battery acid is caustic. There is ariskofi njury.
Avoid contact wit hskin, eyes or clothing .Donotinhale any battery gases. Do no tlean ove rthe
battery. Kee pchildren away from batteries. Wash away battery acid immediately wit hplenty of
clean water and seek medical attention .
278Jump-starting
Breakdown assistance

GWARNING
During charging and jump-starting, explosive gasesc an escapefrom the battery .There is arisk
of an explosion.
Particularl yavoi dfire, open flames, creating sparks and smoking. Ensure there is sufficient ven-
tilation while charging and jump-starting. Do not leano verabattery.
GWARNING
During the charging process,ab attery produces hydrogen gas. If ashort circui toccurs or sparks
are created ,the hydrogen gas can ignite. There is arisk of an explosion.
RMake sure that the positive terminal of aconnected battery does not come into contact with
vehiclep arts.
RNever place metal objects or tools on abattery.
RIt is important that you observe the described order of the battery terminal swhen connecting
and disconnecting abattery.
RWhen jump-starting, make sure that the battery polesw ith identical polarity are connected.
RIt is particularlyimportant to observe the described order when connecting and disconnecting
the jumper cables.
RNever connect or disconnect the battery terminal swhile the engine is running.
GWARNING
Ad ischarged battery can freeze at temperatures below freezing point. When jump-starting the
vehicleorc harging the battery,g asescan escapef rom the battery.T here isarisk of an explosion.
Allow the frozen battery to thaw out before charging it or jump-starting.
!Avoid repeated and lengthy starting attempts. Otherwise, the catalytic converter coul dbe
damaged by the non-combusted fuel.
If the indicator/warning lamp sdonot light up in the instrument cluster at low temperatures, it is very
likelyt hat the discharged battery has frozen. In this case you may neither jump-start the vehiclen or
charge the battery.L et the battery thaw first. The service life of athawed-out battery may be shorter.
The starting characteristics can be impaired,p articularlyatlow temperatures. Have the thawed-out
battery checked at aqualified specialist workshop.
Do not start the vehicleu singarapi dc harging device. If you rvehicle's battery is discharged, the
engine can be jump-started from another vehicleorf romasecond battery using jumper cables.
Observe the following points:
RThe battery is not accessible in all vehicles. If the other vehicle's battery is not accessible,j ump-
start the vehicleu singasecond battery or ajump-starting device.
RYou may only jump-start the vehiclew hen the engine and exhaust system are cold.
RDo not start the engine if the battery is frozen. Let the battery thaw first.
ROnly jump-start from batterieswitha12Vv oltagerating.
ROnly use jumper cables that are not damaged and have asufficient cross-section and insulated
terminal clamps.
RMake sure that the two vehicles do not touch.
Jump-starting279
Breakdown assistance
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Make sure that:
RThe jumper cables are not damaged.
RNon-insulated parts of the terminal clamps do not come into contact with other metal parts while
the jumper cables are connected to the battery.
RThe jumper cables cannot come into contact with parts that can move when the engine is running,
such as the V-belt pulleyorthe fan.
XSecure the vehicle by applying the electric parking brake.
XShift the transmission to position j.
XTurn the SmartKey to positiongin the ignition lock and remove it.
XSwitch off all electrical consumers, e.g. rear window defroster, lighting, etc.
XOpen the hood.
Position number Bidentifies the charged battery of the other vehicle or an equivalent jump-starting
device.
XPress together cover :of positive clamp ;and slide it back.
XConnect positive terminal ;on your vehicle to positive terminal =of donor battery Busing the
jumper cable, beginning with your own battery.
XStart the engine of the donor vehicle and run it at idling speed.
XConnect negative terminal ?of donor battery Bto ground point Aof your vehicle using the
jumper cable, connecting the jumper cable to battery of other vehicle Bfirst.
XIf the battery is fully discharged, leave the battery that is being used to jump-start connected for
afew minutes before attempting to start. This charges the battery slightly.
XStart the engine.
XBefore disconnecting the jumper cables, let the engine run for several minutes.
XFirst, remove the jumper cables from ground point Aand negative terminal ?,then from pos-
itive terminal ;and positive terminal =.Begin each time at the contacts on your own vehicle
first.
XClose cover :of positive terminal ;after removing the jumper cables.
XClose the hood.
XHave the battery checked at aqualified specialist workshop.
iJump-starting is not considered to be anormal operating condition.
280Jump-starting
Breakdown assistance

iJumper cablesand further informatio nregardingj ump-startin gcan be obtaine datany qualified
specialist workshop.
Towing and tow-starting
Important safety notes
GWARNING
Functionsr elevanttos afety are restricted or
no longer available if:
Rth ee ngine is no trunning.
Rtheb rakes ystem or th epower steering is
malfunctioning.
Rthere is amalfunctio ninthevoltage supply
or th evehicle's electrical system.
If your vehicle is beingt owed, muchm ore
force may be necessaryt osteer or brake.
Thereisar isk of an accident.
In such cases, use atow bar. Before towing,
makes ure that th esteering moves freely.
GWARNING
You can no longer steer th evehicle if the
steering wheel lockh as been engaged. There
is ar isk of an accident.
Always switch off th eignitio nwhen towing the
vehicle with atow cable or atow bar.
GWARNING
When towing or tow-startin ganother vehicle
and its weight is greater than th epermissible
gross weight of your vehicle ,the :
Rthet ow ing eye could detach itself
Rthev ehicle/trailer combinatio ncould roll-
over.
Thereisar isk of an accident.
When towing or tow-startin ganother vehicle,
its weight shouldn otbe greater than th eper-
missible gross weight of your vehicle.
Details on th epermissible gross vehicle weight
of your vehicle can be foun donthevehicle iden-
tification plate(
Ypage 314).
!When Activ eBrake Assist,D istance Pilot
DISTRONIC or th eHOLDfunction is activated, th
ev ehicle brakes automatically in certain
situations.
To avoid damage to th evehicle ,deactivate
these systems in th efollowing or similar sit-
uations:
Rwhen towing th evehicle
Rin th ecar wash
!Makes ure that th eelectric parking brak eis
released. If th eelectric parking brakeisf aulty,
visitaq ualifiedspecialist workshop.
!Only secure th etow rope or to wbar at the
towing eyes. Otherwise, th evehicle coul dbe
damaged.
!Do no tuse th etow ing eyes for recoveryp ur-
posesast hisc oul dd amage th evehicle .Ifin
doubt,r ecover th evehicle with acrane.
!When towing ,pull away slowly and
smoothly. If th etractive power is to ohigh,t he
vehicle scoul dbed amaged.
!The vehicle can be towed amaximum of
30 miles (50km ). The towing speed of 30 mph
(50km/h) must no tbeexceeded.
If th evehicle has to be towed moret han
30 miles (50km), th efront axle must be raised
or th eentire vehicle raiseda nd transported.
!Do nottow with sling-type equipment .This
coul ddamage th evehicle.
!When towing vehicle swith KEYLESS-GO,
use th ekey instead of th eStart/Sto pbutton.
Otherwise, th eautomatic transmission may
shifttop ositionPwhen th edriver' sorf ront-
passenger door are opened, whichc ouldlead
to damage to th etransmission.
!Vehicles with automatic transmission must
no tbes tarted by tow-starting. This coul doth-
erwis edamage th etransmission.
It is bette rtohave th evehicle transported than
to have it towed away.
If th evehicle can no longer be driven because of
an accidentorb reakdown,you have thefollow-
ing options:
RTransportin gthe vehicle.
Towing and tow-starting281
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Noteson4 MATIC vehicles
!
Vehicle swith4 MATIC must not be towed
with eithe rthe front or the rea raxler aised, as
doing so will damage the transmission.
Vehicle swith4 MATIC mayo nlye ithe rbet owed
away with both axles on the ground or be loaded
up and transported.
If the vehicle' stransmission, front, or rea raxlei s
damaged, have the vehicl etransporte dona
truck or trailer.
In the even tofdamagetot he electrical sys-
tem:
If the battery is defective, the automatic trans-
mission will be locked in position j.Tos hift the
automatic transmission to position i,you
must provide powe rtothe vehicle' son-board
electrica lsys temint he same wa yaswhenjump-
starting (
Ypage 278).
Have the vehicl etransporte donatransporte ror
trailer.
Tow-startin g(em ergency engine
starting)
!
Vehicle switha utomatic transmission must
not be tow-started .You could otherwis edam -
ag et he automatic transmission.
iYouc an find information on "Jump-starting"
under (Ypage 278).
Fuses
Important safety notes
GWARNING
If yo umanipulate or bridg eafaulty fuse or if
yo ur eplace it with afusew ithah igheramper -
age, the electric cable scould be overloaded.
This could resul tinafire. There is ariskofa n
accident and injury.
Alway sreplace faulty fusesw itht he specified
new fusesh avingthe correc tamperage.
!Onlyu sefusest hath aveb eena pproved for
Mercedes-Benz vehicles and which have the
correc tfus er ating for the systemc oncerned.
Onlyu sefusesm arked with an "S" .Other- wise,c
omponents or systems could be dam-
aged.
!Make sure tha tnomoisture can ente rthe
fuse bo xwhent he cover is open.
!When closing the cover, make sure tha titis
lying correctly on the fuse box. Moistur eseep-
ing in or dirt could otherwis eimpair the oper-
ation of the fuses.
Th ef uses in your vehicl eserve to close down
faulty circuits .Ifafuse blows, al lthe compo-
nents on the circuit and their functions stop
operating.
Blown fusesm ustber eplaced with fusesoft he
same rating ,which yo ucan recognize by the
color and value. Th efuser ating sarelistedint he
fuse allocation chart.
Th efusea lloc atio
nc h
art is in the fuse bo xinthe
front-passenge rfootwell (Ypage 285).
If an ewly inserte dfusea lsob lows ,havet he
cause traced and rectifie dataqualified special-
is tw orkshop ,e.g.ana uthorized Mercedes-Benz
Center.
Before changin gafuse
XSecure the vehicl eagain st rolling away
(Ypage 141).
XSwitch off al lelectrica lconsumers.
XVehicle swithout KEYLESS-GO: remove the
SmartKeyf romthe ignition lock.
XVehicle swithK EYLESS -GOs tart-function
or KEYLESS-GO: open the driver's door.
Th ev ehicl eelectronics ar enow in position
g .Thisc orresponds to the SmartKeyb eing
remove dfromt he ignition.
Th ef uses arel oc ated in variou sfuseb oxes:
RFuse bo xinthe engine compartment on the
left-hand side of the vehicle, when viewed in
the directio noftravel
RFuse bo xinthe front-passenge rfootwell
Th efus ea lloc atio nchart is on the fuse bo xinthe
front-passenge rfootwell (
Ypage 285).
284Fuses
Breakdow nassistance