check engine light MERCEDES-BENZ SLC 2018 Owners Manual

Assistance men u( on-boar dc om-
puter) .................................................. 170
ASSYS TP LUS
Dis playin gas ervic em essage ........ 237
Hiding as ervic em essage .............. 237
Resetting th es ervic ei nterval dis-
play ................................................ 237
Se rvice message ............................ 237
Spe cial servic er equirements ........ .2 38
ATA (Anti-Theft Alarm system)
Activating/deactivating ................... 64
Function .......................................... .6 4
Switching off the alarm .................... 64
ATTENTIO NA SSIS T
Activating/deactivating ................. 171
Displa ym essage ............................ 193
Function/note s. ............................ 158
Audi om en u( on -board computer) .... 168
Audi os ystem
see Digital Operator's Manual
Authorized Mercedes-Benz Center
see Qualifie ds pecialist workshop
Authorized workshop
see Qualifie ds pecialist workshop
AUTO lights
Displa ym essage ............................ 189
see Lights
Automatic car was h( ca re) ............... 238
Automatic engine start (ECO start/
sto pf unction) .................................... 119
Automatic engine switch-off (ECO
start/sto pf unction) .......................... 119
Automatic headlamp mode ................ 95
Automatic transmission
Accelerator peda lp osition ............. 125
Changing gea r. .............................. 125
Displa ym essage ............................ 198
Drive progra m. ............................... 125
Drive progra md is play .................... 122
Driving tip s. ................................... 125
DYNAMIC SELECT button .............. 121
Emergency running mod e. ............. 129
Eng ag
ing drive position .................. 124
Engaging neutral ............................ 123
Engaging park position automati-
cally ............................................... 123
Engaging reverse gea r. .................. 123 Engaging the park position ............ 123
Gearshift recommendation ............ 128
Kickdow n. ...................................... 125
Manua ls hifting .............................. 126
Oil temperature (on-board com-
puter, Mercedes-AM GS LC 43) ...... 175
Overview ........................................ 122
Problem (malfunction) ................... 129
Pulling away ................................... 118
Selector lever ................................ 122
Starting the engine ........................ 117
Steering whee lp addl es hifters ...... 126
Transmission position display ........ 122
Transmission positions .................. 124
Automatic transmissio ne mer-
genc ym ode ....................................... 129
B Back button ....................................... 212
BAS (Brake Assist System) ................. 57
Battery (SmartKey)
Checking .......................................... 68
Important safety notes .................... 67
Replacing ......................................... 68
Battery (vehicle)
Charging ........................................ 253
Displa ym essage ............................ 191
Important safety notes .................. 251
Jump starting ................................. 253
Overview ........................................ 251
Belt
see Sea tb el ts
Bel tw arning ......................................... 42
Blind Spo tA ssis t
Activating/deactivating ................. 171
Displa ym essage ............................ 194
Notes/function .............................. 159
Bluetooth ®
Searching for am obil ep hone ........ 215
Searching for am obil ep hone
(device manager ). .......................... 216
see also Digital Operator's Man-
ua l. ................................................. 211
Telephony ...................................... 215
Brake Assist System
see BAS (Brake Assist System) Index 5

SmartKey
Changing the battery ....................... 68
Changing the programming ............ .6 6
Checkin gt he battery ...................... .6 8
Display message ............................ 201
Doo rc entral locking/unlocking ....... 65
Important safety note s. ................... 65
Los s. ................................................ 69
Mechanical key ................................ 67
Opening/closing the roo f. ............... 79
Overview .......................................... 65
Positions (ignition lock) ................. 116
Problem (malfunction) ..................... 69
Starting the engine ........................ 118
SMS
see also Digital Operator's Man-
ua l. ................................................. 211
Sno wc hains ...................................... 262
Sockets
Center console .............................. 223
Genera ln otes ................................ 223
Sound
Switching on/of f. .......................... 212
Special seat belt retractor .................. 54
Specialist workshop ............................ 27
Speed, controlling
see Cruise control
Speedometer
Digital ............................................ 167
In the Instrument cluster ................. 32
Segments ...................................... 163
Selecting the display uni t. .............. 172
Sport handlin gm ode
Activating/deactivating
(Mercedes-AM GS LC 43) ................. 62
Warning lamp ................................. 206
Standin gl amps
Displa ym essage ............................ 189
Switching on/of f. ............................. 96
Start/sto pf unction
see ECO start/stop function
Startin g( engine ) ................................ 117
Steering
Displa ym essage ............................ 200
Steering wheel
Adjusting (electrically) ..................... 89
Adjusting (manually) ........................ 88
Butto no verview ............................... 33 Buttons (on-board computer) ......... 164
Important safety notes .................... 88
Storing settings (memory func-
tion) ................................................. 93
Steering whee lp addle shifters ........ 126
Stopwatch (RACETIMER) ................... 175
Stowag ea reas ................................... 219
Stowag ec om partments
Armrest (under ). ............................ 219
Cente r console .............................. 220
C u ph olders ................................... 221
Door ............................................... 220
Eyeglasses compartment ............... 220
Glove box ....................................... 219
Important safety information ......... 219
Rear wall ........................................ 220
Stowag en et ................................... 220
Stowag en et ....................................... 220
Summe rt ires ..................................... 262
Sun visor ............................................ 222
Surround lighting (on-board com-
puter) .................................................. 173
Switchin ga ir-recirculatio nm ode
on/off ................................................. 112
Switchin gonm edi am ode
Via the device list .......................... 217
T
Tachometer ........................................ 163
Tail lamps
Displa ym essage ............................ 189
see Lights
Tank content
Fue lg auge ....................................... 32
Technical data
Capacities ...................................... 290
Emergency spare whee l. ................ 286
Information .................................... 288
Tires/wheels ................................. 284
Vehicl ed at a. .................................. 295
TELEAID
Call priority .................................... 227
Emergency cal l. ............................. 225
Genera ln otes ................................ 224
MB info cal lb ut ton ........................ 226
Roadsid eA ssistance button .......... 226
Self-test ......................................... 224 Index 17

regular interval sw hile the engine is running.
Therefore, malfunctions can be detected in
good time.
The u restraint system warning lamp on the
instrument cluster lights up when the ignitio ni s
switched on. It goes out no later than af ew sec-
onds after the vehicl eiss tarted. The compo-
nents of the restraint system are in operational
readiness.
Am alfunction has occurred if the u restraint
system warning lamp: R
does not light up after the ignitio niss witched
on R
does not go out after af ew seconds with the
engine running R
lights up again while the engine is running
G WARNING
If the restraint system is malfunctioning,
restraint system components may be trig-
gered unintentionally or may not deploy as
intended during an accident. This can affect
for exampl et he Emergency Tensioning
Device or the air bag .T his poses an increased
risk of injury or even fatal injury.
Have the restraint system checked and
repaired in aq ualified specialist workshop as
soon as possible.
PASSENGER AI RB AG indicator lamp
PASSENGER AIR BAG ON indicator lamp C and
PASSENGER AIR BAG OFF indicator lamp D are
part of the Occupant Classification System
(OCS). The indicator lamp sd isplay the status of the
front-passenge rf ront air bag. R
PASSENGER AIR BAG ON lights up for 60 sec-
onds, subsequently both indicator lamp sa re
off (PASSENGER AIR BAG ON and OFF): the
front-passenge rf ront air bag is abl etod eploy
in the event of an accident. R
PASSENGER AIR BAG OFF lights up: the front-
passenger front air bag is deactivated. It will
then not be deploye dint he event of an acci-
dent.
If the PASSENGER AIR BAG ON indicator lamp is
off, only the PASSENGER AIR BAG OFF indicator
lamp shows the status of the front-passenger
front air bag .T he PASSENGER AIR BAG OFF
indicator lamp may be lit continuously or be off.
Depending on the person in the front-passenger
seat, the front-passenge rf ront air bag must
either be deactivated or enabled; see the fol-
lowing points. You must make sure of this both
before and during aj ourney.R
Children in ac hil dr estraint system:
whethe rt he front-passenge rf ront air bag is
enabled or deactivated depends on the instal-
led child restraint system, and the age and
size of the child .T herefore, be sure to observe
the notes on the "Occupant Classification
System (OCS)" ( Y
pag e4 5) and on "Chil-
dren in the vehicle" ( Y
pag e5 3). There you
wil la ls of ind instructions on rearward and
forward-facing child restraint systems on the
front-passenge rs eat. R
All other persons: depending on the classi-
ficatio noft he person in the front-passenger
seat, the front-passenge rf ront air bag is ena-
bled or deactivated ( Y
pag e4 5). Be sure to
observe the notes on "Seat
belts“ ( Y
pag e3 9) and "Air bags"
( Y
pag e4 3) .T here you can als of ind infor-
mation on the correct seat position.
Seat belts
Introduction
Seat belts are the most effective means of
restricting the movement of vehicl eo ccupants
in the event of an accident or the vehicl er olling
over. This reduces the risk of vehicl eo ccupants
coming into contact with parts of the vehicle
interior or being ejected from the vehicle. Fur-
thermore, the seat belt help stok eep the vehicleOccupant safety 39
Safety Z

Problem
Possible causes/consequences and P Solutions
The engine cannot be
started using the Smart-
Key. The on-board voltage is too low. X
Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work: X
Check the starter battery and charge it if necessary ( Y
page 253).
or X
Jump-start the vehicle ( Y
page 253).
or X
Consult aq ualified specialist workshop.
The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle. The vehicle is locked. X
Unlock the vehicle and try to start the vehicle again.
The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 68) and replace it if necessary
( Y
page 68).
If this does not work: X
Start your vehicle with the SmartKey in the ignition lock.
There is interference from ap owerful source of radio waves.X
Start your vehicle with the SmartKey in the ignition lock.
You have lost aS mart-
Key. X
Have the SmartKey deactivated at aq ualified specialist workshop.X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
The side windows cannot
be opened or closed
using the convenience
opening/closing fea-
ture. The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 68) and replace it if necessary
( Y
page 68).
Doors
Important safety notes
G WARNING
If children are left unsupervised in the vehicle,
they could: R
operate the vehicle's equipment. Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake R
shift the automatic transmission out of park
position P R
start the engine
There is ar isk of an accident and injury.
Never leave children or animals unattended in
the vehicle.70
Doors
Opening and closing

Problems with the windshield wipers Problem
Possible causes/consequences and P Solutions
The windshield wipers
are jammed. Leaves or snow, for example, may be obstructing the windshield wiper
movement .T he wiper motor has been deactivated. X
For safety reasons, you should remove the SmartKey from the igni-
tion lock.
or X
Switch off the engine using the Start/Stop button and open the
driver's door. X
Remove the cause of the obstruction. X
Switch the windshield wipers back on.
The windshield wipers
fail completely. The windshield wiper drive is malfunctioning. X
Select another wiper speed on the combination switch. X
Have the windshield wipers checked at aq ualified specialist work-
shop.
The windshield washer
fluid from the spray noz-
zles no longer hits the
center of the windshield. The spray nozzles are misaligned. X
Have the spray nozzles adjusted at aq ualified specialist workshop.Windshield wipers 103
Lights and windshiel dw ipers Z

As soo na st he ignition is switched on, al lt he
indicator lamps in the instrument cluster light
up .F urther informatio nons it uations where an
indicator lamp either fails to go ou ta fte rs tarting
the engine or lights up whil ed riving
( Y
page 204).
If Start/Stop button C ha sn ot ye tb ee n
pressed, thi sc orrespond stot he key being
remove df rom the ignition.X
To switc hont he power supply: press
Start/Stop button C once.
The powe rs uppl yiss wi tched on. Yo uc an now
activate the windshield wipers, for example.
The powe rs uppl yiss wi tched off agai ni f:R
the driver's door is opene da ndR
yo up ress Start/Stop button C twice when
in thi sp ositionX
To switc hont he ignition: press Start/Stop
button C twice.
The ignition is switched on.
If yo up ress Start/Stop button C once when
in thi sp osit ion, the ignition is switched off
again.
Removing the Start/Sto pb uttonYo uc an remove the Start/Stop button from the
ignition lock and start the vehicl easn ormal
using the SmartKey. X
Remove Start/Stop button C from ignition
lock D .
Yo udon ot have to remove the Start/Stop but-
ton from the ignition lock when yo ul eave the
vehicle. Yo us hould, however, always take the
SmartKe yw it hy ou when leaving the vehicle. As
long as the Sma rtKe y isint h
e vehicle:R
the vehicl ec an be started using the Start/
Stop button R
the electrically powered equipment can be
operated
Starting the engine
Important safety notes
G WARNING
If children ar el ef tu nsupervised in the vehicle,
they could: R
operate the vehicle's equipment. Additionally, children could set the vehicl ei n
motion if, for example, they: R
release the parking brake R
shift the automatic transmission ou tofp ar k
position P R
start the engine
There is ar is kofana ccident and injury.
Never leav ec hildren or animals unattended in
the vehicle.
Whe nl eavi ng the vehicle, always take the
SmartKe yw it hy ou and lock the vehicle. This
also applie stom obil ep hones if the "Digital
Ca rK ey in smartphone "f un ctio ni sa ctivated
via the Mercedes me connect we ba pp .
G WARNING
Combustion engine se mi tp oiso nou se xhaust
gases such as carbo nm onoxide. Inhaling
thes ee xhaus tg as es lead stop oiso ning. There
is ar is koff ata li njury .T herefore neve rl eave
the engine running in enclose ds paces with-
ou ts uf ficient ventilation.
G WARNING
Flammabl em at erial si ntroduced through
environmenta li nfluence or by animals can
ignite if in contact with the exhaus ts ys tem or
parts of the engine tha th ea tu p. There is ar isk
of fire.
Carry ou tr egular checks to make sure that
ther ea re no flammabl ef oreig nm at erial si n
the engine compartment or in the exhaust
system.
During ac ol ds tart, the engine runs at higher
speed stoe nabl et he catalytic converter to
reach its operating temperature .T he sound of
the engine ma yc hange during thi st ime.
Automati ct ransmission X
Depres st he brake peda la nd kee pi t
depressed. X
Shift the transmission to position ] .
Transmission positio nd is play ] is shown in
the multifunctio nd is play.Driving 117
Driving an dp arking Z

Problem
Possible causes/consequences and P Solutions
The engine is not running
smoothly and is misfir-
ing. There is am alfunction in the engine electronics or in am echanical
componen toft he engine management system.X
Only depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it. X
Have the cause rectified immediately at aq ualified specialist work-
shop.
The coolant temperature
gauge shows av alue
above 248 ‡( 120 †).
The coolant warning
lamp may also be on and
aw arning tone may
sound. The coolant level is too low. The coolant is too hot and the engine is no
longer being cooled sufficiently. X
Stop as soon as possible and allow the engine and the coolant to
cool down. X
Check the coolant level ( Y
page 235). Observe the warning notes
as you do so and add coolant if necessary.
If the coolant level is correct ,t he engine radiator fan may be faulty. The
coolant is too hot and the engine is no longer being cooled sufficiently. X
At coolant temperatures below 248 ‡( 120 †), drive to the nearest
qualified specialist workshop. X
Avoid heavy loads on the engine as you do so, e.g. driving in moun-
tainou st errai na nd stop-and-go traffic.
DYNAMIC SELEC Tb uttonUse the DYNAMIC SELECT button to change the
drive program. Depending on the drive program
selected the following vehicle characteristics
wil lc hange: R
the drive (engine and transmission manage-
ment) R
the suspensio nort he adaptive adjustable
damping (only on vehicles with AMG RIDE
CONTROL sports suspension) R
the sound of the exhaust system (vehicles
with sports exhaust system) R
the steering R
the availability of the ECO start/stop function
Each time you start the engine with the Smart-
Key or the Start/Stop button, drive program C is
activated. For further information about starting
the engine, see ( Y
pag e1 17). X
Press DYNAMIC SELECT button C as many
times as necessary until the desired drive
progra miss elected.
The selected drive progra ma ppears in the
multifunction display. After as hort period of
time, the displa yg oes out and the symbol for
the selected drive progra ma ppears.
In addition, the current drive progra ms ettings
are displayed briefly in the multimedi as ystem
display.
i In af ew countries, the ECO start/stop func-
tion is deactivated at the factory due to the
available fuel grade. In this case, the ECO
start/stop function is not available in anyDYNAMI CS ELEC Tb utton 121
Driving and parking Z

X
Reac hi nt ot he gap, pull hoo dc atch handle D
up and lift hoo d C .
If you lift th eh oo dbya pproximately 15 in
(40 cm), th eh oo diso pened and held open
automatically by th eg as-filled strut .
Closin gt he hoodX
Lowe rt he hoo da nd let it fall from ah eight of
approximately 8in( 20 cm).X
Chec kt ha tt he hoo dh as engage dp roperly.
If th eh oo dc an be raised slightly, it is no t
properly engaged. Open it again and close it
wit hal ittl em or ef orce .
Engine oil
Notes on th eo il levelDependin gony our driving style, th ev ehicl e
consumes up to 0. 9USq t( 0.8 liters )ofo il pe r
60 0m iles (1,000 km). Th eo il cons umption may
be higher than th is when th ev eh icle is ne wori f
you frequently driv eath igh engin es peeds.
Depen din gont he engine, th eo il dipst ick may be
in ad ifferent location.
When checking th eo il leve l:R
park th ev eh icle on al eve ls urfaceR
th ee ng in es hould be swit ched off for appr ox-
imately fiv em in ute sift he engin eisatn orma l
operatin gt em pe ratureR
if th ee ng in eisn ot at normal operatin gt em -
perature, e.g .ift he engin ew as on ly started
brie fly, wait about 30 minute sb efore carrying
out the measurement Checking the oil level using the oil dip-
stick
G WARNING
Certain component sint he engine compart-
ment ,s uch as the engine, radiator and parts
of the exhaust system, can become very hot.
Workin gint he engine compartment poses a
risk of injury.
Only touch the following component sd escri-
bed.
Example X
Pull oil dipstick C out of the dipstick guide
tube. X
Wipe off oil dipstick C .X
Slowly slide oil dipstick C into the guide tube
to the stop, and take it out again.
If the level is between MIN mark

G WARNING
During the charging process ,ab attery produces hydrogen gas. If as hort circui to ccurs or sparks
are created ,t he hydrogen gas can ignite. There is ar isk of an explosion.R
Make sure that the positive terminal of ac onnected battery does not come into contact with
vehicl ep arts.R
Never place metal objects or tools on ab attery.R
It is important that you observe the described order of the battery terminal sw hen connecting
and disconnecting ab attery.R
When jump-starting, make sure that the battery pole sw ith identical polarity are connected.R
It is particularl yi mportant to observe the described order when connecting and disconnecting
the jumper cables. R
Never connect or disconnect the battery terminal sw hile the engine is running.
G WARNING
Ad ischarged battery can freeze at temperatures below freezing point. When jump-starting the
vehicl eorc harging the battery ,g ase sc an escap ef rom the battery .T here is ar isk 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 db e
damaged by the non-combusted fuel.
If the indicator/warning lamp sdon ot light up at low temperatures, it is very likel yt hat the dis-
charge db attery has frozen. In this case, you may neither charge the battery nor jump-start the
vehicle. The service life of at hawed-out battery may be shorter. The starting characteristics can be
impaired ,p articularl yatl ow temperatures. Have the thawed-out battery checked at aq ualified
specialist workshop.
Do not start the vehicl eu sing ar api dc harging device. If you rv ehicle's battery is discharged, the
engine can be jump-started from another vehicl eorf rom as econd battery using jumper cables.
Observe the following points: R
The battery is not accessible in all vehicles. If the other vehicle's battery is not accessible ,j ump-
start the vehicl eu sing as econd battery or aj ump-starting device.R
You may only jump-start the vehicl ew hen the engine and exhaust system are cold.R
Do not start the engine if the battery is frozen. Let the battery thaw first. R
Only jump-start from batterie sw ith a12Vv oltag er ating.R
Only use jumper cables which have as ufficient cross-section and insulated terminal clamps.R
If the battery is full yd ischarged, leave the battery that is being used to jump-start connected for
af ew minutes before attempting to start. This charge st he battery slightly.R
Make sure that the two vehicles do not touch.
Make sure that: R
The jumper cables are not damaged. R
Bare parts of the terminal clamp do not come into contact with other metal parts while the jumper
cables are connected to the ba ttery.R
The jumper cables cannot come into contact with parts which can move when the engine is
running, such as the V-belt pulley or the fan. X
Secure the vehicl ebya pplying the electric parking brake.X
Shift the transmission to position ] .254
Jump-starting
Breakdown assistance