2018 MERCEDES-BENZ SLC warning light

This could result in burns in the immediate
vicinit yoft he air vents. There is ar isk of injury.
Reduce the heater output before it becomes
too hot.
The AIRSCARF function warms the head and
neck area of vehicle occupant sw ith warm air.
The warm air flows out of the holes in the head
restraints.
The three red indicator lamps in the button indi-
cate the heating level you have selected. X
Ensure that the SmartKey is in position H in
the ignition lock. X
To switch on: press button C .
Three red indicator lamps in the button light
up. The blower start supa fter ap reheating
phase of seven seconds. X
Press button C repeatedly until the desired
heating level is set. X
To switch off: press button C repeatedly
until all the indicator lamps go out.
i The blower continues runnin gf or seven sec-
onds to cool down the heating elements.
i If the battery voltage is too low, AIRSCARF
may switch off.
Problems with AIRSCARF AIRSCARF has switched off prematurely or will
not switch on. The vehicle's electrical system
voltage is too low because too many electrical
consumer sa re switched on.X
Switch off electrical consumer st hat you do
not need, such as the rear window defroster
or interior lighting. X
Switch on AIRSCARF again. Steering wheel
Important safety notes
G WARNING
You could lose control of your vehicle if you do
the following while driving: R
adjust the driver's seat, head restraint,
steerin gw heel or mirrors R
fasten the seat belt
There is ar isk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt
before starting the engine.
G WARNING
Children could injure themselves if they
adjust the steerin gw heel. There is ar isk of
injury.
When leaving the vehicle, alway st ake the
SmartKey with you and lock the vehicle. This
also applies to mobile phones if the "Digital
Car Key in smartphone" function is activated
via the Mercedes me connect web app. Never
leave children unsupervised in the vehicle.
The electrically adjustable steerin gw heel can
still be adjusted when there is no SmartKey in
the ignition lock.
Adjusting the steering wheel man-
ually
G WARNING
If the steerin gw heel is unlocked while the
vehicle is in motion ,itc ould change position
unexpectedly. This could cause you to lose
control of the vehicle. There is ar isk of an
accident.
Before starting off, make sure the steering
wheel is locked. Never unlock the steering
wheel while the vehicle is in motion.88
Steering wheel
Seats, steering wheel and mirrors

the no pe nt he driver's or front-passenger
door.
i The exterio rm ir rors do not fol do ut if they
have been folde dinm an ually.
Exterior mirro rp ushed ou to fp ositionIf an exterio rm ir ro rh as been pushe do ut of
position, procee dasf ollows:X
Vehicle sw it hout electricall yf ol ding exte-
rio rm irrors: mov et he exterio rm ir ro ri nto
the correct positio nm an ually.X
Vehicle sw it he lect ricall yf ol ding exterior
mirrors: press and hol dm ir ror-folding button
unti ly ou hear the mirro rc lick into place
( Y
page 91).
The mirro rh ousing is engaged agai na nd you
can adjus tt he exterio rm ir rors as usual
( Y
page 91).
Automati ca nti-glare mirrors
G WARNING
Electrolyte ma ye sc ap eift he glas sinana ut o-
matic anti-glar em irror breaks. Th ee le ctrolyte
is harmfu la nd cause si rritation. It must not
come into contact with your skin, eyes ,r es-
piratory organs or clothing or be swallowed.
There is ar is kofi njury.
If yo uc ome into contact with the electrolyte,
observe the following: R
Rinse off the electrolyte fro my ou rs kin
immediatel yw it hw at er.R
Immediately rinse the electrolyte ou to f
your eyes thoroughl yw it hc lean water.R
If the electrolyte is swallowed, immediately
rinse your mouth ou tt horoughly. Do not
induce vomiting. R
If electrolyte come si nto contact with your
ski norh ai roriss wallowed ,s ee km edical
attentio ni mm ediately.R
Immediately change ou tofc lothing which
ha sc ome into contact with electrolyte.R
If an allergi cr eactio no ccurs, seek medical
attentio ni mm ediately. The rear-view mirro ra nd the exterio rm ir ro ro n
the driver's side automaticall ygoi nto anti-glare
mod eift he following conditions ar em et simul-
taneously: R
the ignition is switched on and R
incident light fro mh eadlam ps strikes the sen-
sor in the rear-view mirror
The mirrors do not go into anti-glar em od ei f
re v
ers eg ea rise ngaged or if the interio rl ig hting
is switched on.
Parking position fo rt he exterior mir-
ror on the front-passenge rs id e
Settin ga nd storin gt he parking positionUsin gr evers eg ea r
Yo uc an stor et he parking positio noft he front-
passenger-side exterio rm ir ro ru si ng memory
button M

The daytime runnin gl amps improve the visibility
of your vehicle during the day. To do this, the
daytime runnin gl amps function must be
switched on using the on-board computer
( Y
page 172).
If the engine is runnin ga nd you turn the light
switch to ` or X ,t he manual settings
take precedenc eo ver the daytime running
lamps.
Low-beam headlamps
G WARNING
When the light switch is set to X ,t he low-
beam headlamps may not be switched on
automatically if there is fog, snow or other
causes of poor visibility due to the weather
conditions such as spray. There is ar isk of an
accident.
In such situations, turn the light switch to
X .
Even if the light sensor does not detect that it is
dark, the parking lamps and low-beam head-
lamps switch on when the ignition is switched on
and the light switch is set to the X position.
This is ap articularly useful function in the event
of rain and fog. X
To switch on the low-beam headlamps:
turn the SmartKey to position H in the igni-
tion lock or start the engine. X
Turn the light switch to X .
The green X indicator lamp in the instru-
ment cluster lights up.
Rear fog lamp
The rear fog lamp improves visibility of your
vehicle for the traffic behind in the event of thick
fog. Please take not eoft he country-specific
regulations for the use of rear fog lamps. X
To switch on the rear fog lamp: turn the
SmartKey to position H in the ignition lock or
start the engine. X
Turn the light switch to X or X .X
Press the ^ button.
The yellow ^ indicator lamp in the instru-
ment cluster lights up. X
To switch off the rear fog lamp: press the
^ button.
The yellow ^ indicator lamp in the instru-
ment cluster goes out. Parking lamps
! If the battery charge is very low, the parking
lamps or standin gl amps are automatically
switched off to enable the next engine start.
Always park your vehicle safely and in aw ell lit
area, in accordanc ew ith the relevant legal
stipulations. Avoid using the ` parking
lamps over ap eriod of several hours. If pos-
sible, switch on the right-hand d or left-
hand c standin gl amps.X
To switch on: turn the light switch to ` .
The green ` indicator lamp in the instru-
ment cluster lights up.
Standing lamps Switching on the standin gl amps ensures the
corresponding side of the vehicle is illuminated. X
To switch on the standing lamp s: the
SmartKey is not in the ignition lock or it is in
position

X
To switc hont he high-beam headlamps:
turn the light switch to X or X .X
Press the combinatio ns wi tch beyond the
pressure point in the direction of arrow C .
In the X position, the high-bea mh ead-
lamps are onl ys wi tched on when it is dark and
the engine is running.
The blue W indicator lamp in the instru-
ment cluster lights up when the high-beam
headlamps are switched on. X
To switc ho ff the high-beam headlamps:
move the combinatio ns wi tch back to its nor-
ma lp osition.
The blue W indicator lamp in the instru-
ment cluster goe so ut .
Hazard warning lamps
X
To switc hont he hazard warning lamps:
press button C .
All turn signals flash. If yo un ow switch on a
turn signa lu si ng the combinatio ns wi tch ,o nly
the turn signa ll am pont he corresponding
side of the vehicl ew il lf lash.X
To switc ho ff the hazard warning lamps:
press button C .
The hazard warning lamps automaticall ys wi tch
on if: R
an ai rb ag is deployed orR
the vehicl ed ec elerates rapidly from as peed
of above 45 mph (70 km/h )a nd come stoa
standstill
The hazard warning lamps switch off automati-
cally if the vehicl er eache sas peed of above
6m ph (10 km/h )a gain afte raf ul lb rake appli-
cation.
i The hazard warning lamps stil lo pe rate if the
ignition is switched off. Cornerin gl ig ht functionThe cornering light functio ni mprove st he illu-
minatio noft he roa do ve raw id ea ngle in the
direction yo ua re turning, enabling better visi-
bility in tight bends, for example. The cornering
light functio nc an onl ybea ctivate dw he nt he
low-bea mh eadlamps are switched on.
Active: R
if yo ua re driving at speed sb elow 25 mph
(40 km/h )a nd switch on the turn signa lo r
turn the steering wheel R
if yo ua re driving at speed sb et ween 25 mph
(40 km/h )a nd 45 mph (70 km/h )a nd turn
the steering wheel
The cornering lamp ma yr emai nl it for as hort
time ,b ut is automaticall ys wi tched off afte rn o
more tha nt hre em inutes.
Cornerin gl ig ht functio nw it ht raffi cc ir cle
function:
The cornering light functio ni sa ctivate donb ot h
side sb ef ore entering at raffic circle throug ha n
evaluation of the current GP Sp osition of the
vehicle. It remains active unti la fte rt he vehicle
ha sl ef tt he traffic circle .Int hi sw ay ,p edes trians
crossing the road, for example, are illuminated
by your vehicl eing oo dt ime.
Active light function The active light functio ni sas ys tem tha tm oves
the headlamps according to the steering move-
ments of the front wheels .Int hi sw ay ,r elevant
areas remai ni llum inated whil ed riving .T his
allows yo utor ecognize pedestrians ,c yclists
and animals sooner.
Active: when the lights are switched on.
Vehicles with Lane Keeping Assist: the active
light functio ne valuate st he course of the lane in
which yo ua re driving and pre-emptively con-
trol st he active light function.
Adaptiv eH ighbeam Assist
General notes
Yo uc an us et hi sf unctio ntos et the headlamps
to change between lo wb ea ma nd high beam
automatically. The system recognizes vehicles
with thei rl ig hts on, either approaching from the
opposite direction or traveling in front of yourExterior lighting 97
Lights and windshield wiper s Z

vehicle, and consequently switches the head-
lamp sf rom high bea mtol ow beam.
The system automatically adapts the low-beam
headlamp range depending on the distance to
the other vehicle. Once the system no longer
detects any other vehicles, it reactivates the
high-beam headlamps.
The system' so ptical sensor is located behind
the windshiel dn ear the overhea dc ontrol panel.
Important safety notes
G WARNING
Adaptive Highbeam Assist does not recognize
road users: R
who have no lights, e.g. pedestrians R
who have poor lighting, e.g. cyclists R
whos el ighting is blocked ,e .g. by ab arrier
On very rare occasions, Adaptive Highbeam
Assist may fail to recognize other road users
that have lights, or may recognize them too
late. In this, or in similar situations, the auto-
matic high-beam headlamp sw il ln ot be deac-
tivated or wil lbea ctivated regardless. There is
ar isk of an accident.
Always carefully observe the traffic conditions
and switch off the high-beam headlamp si n
good time.
Adaptive Highbeam Assist cannot take into
account road ,w eather or traffic conditions.
Adaptive Highbeam Assist is only an aid .Y ou are
responsible for adjusting the vehicle's lighting
to the prevailing light, visibility and traffic con-
ditions.
In particular, the detection of obstacles can be
restricted if there is: R
poor visibility, e.g. due to fog, heavy rain or
snow R
dirt on the sensors or the sensors are
obscured Switching Adaptive Highbeam Assist
on/off X
To switch on: turn the light switch to X .X
Press the combination switch beyond the
pressure point in the directio nofa rrow C .
The

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

In addition to driving style, the actual consump-
tion is affected by other factors, such as: R
load R
tire pressure R
cold start R
choice of route R
active electrical consumers
These factors are not include dint he ECO dis-
play.
An economical driving style specially requires
driving at moderate engine speeds.
Achieving ah igher valu eint he categories
"Acceleration" and "Constant": R
observe the gearshift recommendations. R
drive the vehicle in drive program C or E .
In urba nt raffic and stop-start traffic, drive pro-
gram C is recommended.
On long journeys at ac onstant speed ,e .g. on the
highway, only the outer area for "constant" will
change.
The ECO display summarizes the driving style
from the start of the journey to its completion.
Therefore, there are more marked changes in
the outer area satt he start of aj ourney. On lon-
ger journeys, there are fewer changes. For more
marked changes, perform am anua lr est
( Y
page 167).
Further information on the ECO display
( Y
page 166).
Braking
Important safety notes
G WARNING
If you shift down on as lippery road surface in
an attempt to increase the engine's braking
effect, the drive wheel sc ould lose their grip.
There is an increased danger of skidding and
accidents.
Do not shift down for additional engine brak-
ing on as lippery road surface.
Downhill gradients
! On long, steep gradients, you must reduce
the load on the brakes. To use engine braking,
shift to al owe rg ear in good time. This helps you to avoid overheating the brakes and wear-
ing them out excessively.
When making use of the engine braking
effect, it is possible that ad rive wheel may not
turn for some time, e.g. in the case of sud-
denly changing or slippery road surface con-
ditions. This could cause damage to the drive
train. This type of damage is not covered by
the Mercedes-Benz warranty.
Change into al owe rg ear in good time on long
and steep downhill gradients. This is especially
important if the vehicle is laden.
This also applies if you have activated cruise
control or Distance Pilo tD ISTRONIC.
Heavy and light loads
G WARNING
If you rest you rf oot on the brake peda lw hile
driving, the braking system can overheat. This
increases the stopping distance and can even
cause the braking system to fail .T here is a
risk of an accident.
Never use the brake peda lasaf ootrest. Never
depres st he brake peda la nd the accelerator
peda latt he same time.
! Depressing the brake peda lc onstantly
results in excessive and premature wea rt o
the brake pads.
If the brakes have been subjected to ah eavy
load ,don ot stop the vehicle immediately ,b ut
drive on for as hort while. This allows the airflow
to cool the brakes more quickly.
Wet roads If you have driven for al ong time in heavy rain
withou tb raking, there may be ad elayed reac-
tion from the brakes when braking for the first
time. This may also occur after the vehicle has
been washed or driven through deep water.
You then have to depres st he brake peda lm ore
firmly .M aintai nag reater distance from the
vehicle in front.
After driving on aw et road or having the vehicle
washed, brake firmly whil ep aying attention to
the traffic conditions. This wil lw arm up the
brake discs, thereby drying them more quickly
and protecting them against corrosion.136
Driving tips
Driving and parking