engine MERCEDES-BENZ SLC-Class 2017 R172 Owner's Guide

Correct driver's seat position
GWARNING
You coul dlose control of your vehicle if you do
th ef ollowingw hile driving:
Radjust thedriver'ss eat,head restraint,
steering wheel or mirrors
Rfasten th eseat belt
Thereisar iskofana ccident.
Adjust th edriver'ss eat,head restraint ,steer-
ing wheel and mirror and fasten your seat belt before starting th eengine.
XObserv ethe safety guideline sonseat adjust-
men t(Ypage 82).
XMakes ure that seat =is adjusted properly.
Manual seat adjustmen t(
Ypage 84)
Electrical seat adjustmen t(
Ypage 84)
When adjusting th eseat,m akes ure that:
Ryou are as far away from th edriver'sa ir bag as
possible
Ryou are sittin ginanormalupright position
Ryou can fasten th eseat belt properly
Ryou have moved th ebackres ttoana lmost
vertical position
Ryou have set th eseat cushion angle so that
your thighs are gently supported
Ryou can depress th epedals properly
XCheckw hether th ehead restraint is adjusted
properly. When doings
o, makesure that you have
adjusted th ehead restraint so that th eback of
your head is supported at eye leve lbythe
cente rofthehead restraint.
XObserv ethe safety note sonsteering column
adjustmen t(Ypage 86).
XMakesure that steering wheel :is adjusted
properly.
Adjusting th esteering wheel man-
ually(
Ypage 86)
Adjusts th esteering wheel electrically
(
Ypage 87)
When adjusting th esteering wheel column,
mak esure that:
Ryou can hold th esteering wheel withy our
arm sslightly bent
Ryou can mov eyour legs freely
Ryou can see all th edisplays in th einstrument
cluste rclearly
XObserv ethe safety guideline sfor seat belts
(Ypage 39).
XCheckw hether you have fastened seat
belt ;properl y(Ypage 40).
The seat belt should:
Rfit snugly across your body
Rbe routed across th emiddle of your shoulder
Rbe routed in your pelvic area across th ehip
joints
XBefore starting off ,adjust th erear-view mirror
and th eexteri or mirror s(Ypage 88) in such
aw ay that you have agood view of road and
traffic conditions.
XVehicles with amemory function: save the
seat,s teering wheel and exterior mirror set-
tings (
Ypage 91).
Seats
Important safety notes
GWARNING
Children coul dbecome trapped if they adjust
th es eats, particularly when unattended.
Thereisar iskofi njury.
When leaving th evehicle ,always tak ethe
SmartKey withy ou and lockthevehicle .Never
leave childre nunsupervised in th evehicle.
82Seats
Seats, steerin gwheel and mirrors

The seats can still be adjusted when there is no
SmartKey in the ignition lock.
GWARNING
When you adjust aseat, you or other vehicle
occupantsc ould become trapped, e.g. on the
seat guide rail. There is arisk of injury.
Make sure when adjusting aseat that no one
has any body parts in the sweep of the seat.
Observe the safety notes on "Air bags"
(
Ypage 42) and "Children in the vehicle"
(Ypage 51).
GWARNING
If the driver's seat is not engaged, it could
move unexpectedly while the vehicle is in
motion .This could cause you to lose control of
the vehicle. There is arisk of an accident.
Always make sure that the driver's seat is
engaged before starting the vehicle.
GWARNING
If you adjust the seat height carelessly, you or
other vehicle occupantsc ould be trapped and
thereby injured. Children in particular could
accidentally press the electrical seat adjust-
ment button sand become trapped. There is a
risk of injury.
While moving the seats, make sure that your
hands or other body parts do not get under the
lever assembly of the seat adjustmen tsys-
tem.
GWARNING
If the head restraints are not installed or not
adjusted correctly, they cannot provide pro-
tection as intended. There is an increased risk
of injury in the head and neck area, e.g. in the event of an accident or when braking.
Always drive with the head restraints instal-
led. Before driving off, make sure for every
vehicle occupant that the center of the head
restraint supports the back of the head at
about eye level.
GWARNING
You could lose control of your vehicle if you do the following while driving:
Radjust the driver's seat, head restraint,
steerin gwheel or mirrors
Rfasten the seat belt
There is arisk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the engine.
!To avoid damage to the seats and the seat
heating, observe the following information:
Rkeep liquids from spilling on the seats. If
liquid is spilled on the seats, dry them as
soon as possible.
Rif the seat covers are damp or wet, do not
switch on the seat heating. The seat heat-
ing should also not be used to dry the seats.
Rclean the seat covers as recommended;
see the "Interior care" section.
Rdo not transport heavy loads on the seats.
Do not place sharp object sonthe seat
cushions, e.g. knives, nails or tools. The
seats should only be occupied by passen-
gers, if possible.
Rwhen the seat heating is in operation, do
not cover the seats with insulating materi-
als, e.g. blankets ,coats, bags, seat covers,
child seats or booster seats.
!Make sure that there are no object sinthe
footwell under or behind the seats when mov-
ing the seats back. There is arisk that the
seats and/or the object scould be damaged.
iThe head restraints are equipped with the
NECK-PRO system (Ypage 50). For this rea-
son, it is not possible to remove the head
restraints from the seats.
For more information, contact aqualified spe-
cialist workshop.
Seats83
Seats, steering wheel and mirrors
Z

Adjusting theseats manually
XSea tfore-and-aft adjustment: lift lever:
and slid ethe seat forward sorbackwards .
XReleaselever :again .
Mak esuret haty ou hear th eseat engage in
position .
XTo adjust th ebackres tangle: relievethe
pressur eonthebackrest .
XPull handle ;and mov ebackrest to th e
desired angle.
XReleas ehandle ;again .
The backrest mus taudibly engage .
XTo adjust theseath eight :pull handle =
upwards or push it down repeatedly until th e
seat has reached th edesired height .
Adjusting th eseats electri cally
:Backrest angle
;Seat fore-and-af tadjustmen t
=Seat cushion angle
?Seat height
iYou can store th eseat setting susingthe
memory function (Ypage 91).
Adjusting th eheadr estraints
GWARNIN G
You could lose control of your vehicl eifyou do
th ef ollowin gwhile driving:
Radjust th edriver's seat ,head restraint,
steering whee lormirrors
Rfaste nthe seat belt
There is ariskofana ccident.
Adjus tthe driver's seat ,head restraint, steer -
ing whee land mirror and faste nyour seat belt
before starting th eengine.
XTo raise/lower: push thehead restrain t
upwards or pull it down int othe desired posi-
tion .
Adjusting th e4-wa ylumbar support
:Raises th ebackrest contour
;Soften sthe backrest contour
=Lowers th ebackrest contour
?Harden sthe backrest contour
84Seats
Seats ,steering wheel and mirrors

XPress button:repeatedly until the desired
heating level is set.
XTo switch off: press button:repeatedly
until all the indicator lamps go out.
iThe blower continues runnin gfor seven sec-
onds to cool down the heating elements.
iIf 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
consumers are switched on.
XSwitc hoff electrical consumers that you do
not need, such as the rear window defroster
or interior lighting.
XSwitc honA IRSCARF again.
Steering wheel
Important safety notes
GWARNING
You could lose control of your vehicle if you do the following while driving:
Radjust the driver's seat, head restraint,
steerin gwheel or mirrors
Rfasten the seat belt
There is arisk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the engine.
GWARNING
Children could injure themselves if they
adjust the steerin gwheel. There is arisk of
injury.
When leaving the vehicle, alwayst ake the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
The electrically adjustable steerin gwheel can
still be adjusted when there is no SmartKey in
the ignition lock.
Adjusting the steering wheel man-
ually
GWARNING
If the steerin gwheel is unlocked while the
vehicle is in motion ,itcould change position
unexpectedly. This could cause you to lose
control of the vehicle. There is arisk of an
accident.
Before starting off, make sure the steering
wheel is locked. Never unlock the steering
wheel while the vehicle is in motion.
:Release lever
;Adjust sthe steerin gwheel height
=Adjust sthe steerin gwheel position (fore-
and-aft adjustment)
XPush release lever :down completely in the
direction of the arrow.
The steerin gcolumn is unlocked.
XAdjust the steerin gwheel to the desired posi-
tion.
XPush release lever :up completely.
The steerin gcolumn is locked.
XCheck if the steerin gcolumn is locked. When
doing so, try to push the steerin gwheel up or
down or try to move it in the fore-and-aft
direction.
86Steering wheel
Seats, steering wheel and mirrors

Position of the steering wheel when the
EASY-ENTRY/EXIT featureisactive
The steering wheel swings upwards when you:
Rremove the SmartKey from the ignition lock
Ropen the driver's door with KEYLESS-GO in
position1
Ropen the driver's door and the SmartKey is in
position0or 1in the ignition lock
iThe steering wheel only moves upwards if it
has not already reached the upper end stop.
Position of the steering wheel for driv-
ing
The steering wheel is moved to the last selected
position when:
Rthe driver's door is closed
Ryou insert the SmartKey into the ignition lock
or
Ryou press the Start/Stop button once on vehi-
cles with KEYLESS-GO
When you close the driver's door with the igni-
tion switched on, the steering wheel is also
automatically moved to the previously set posi-
tion.
The last position of the steering wheel is stored
when you switch off the ignition or when you
store the settingw ith the memory function
(
Ypage 91).
Crash-responsive EASY-EXIT feature
If the crash-responsive EASY-EXIT feature is trig-
gered in an accident, the steering column will
move upwards when the driver's door is opened.
This occurs irrespective of the position of the
SmartKey in the ignition lock. This makes it eas- ier to exit the vehicle and rescue the occupants.
The crash-responsive EASY-EXIT feature is only
operational if the EASY-EXIT/ENTRY feature is
activated in the on-board computer
(
Ypage 174).
Mirrors
Rear-view mirror
XAnti-glare mode: flick anti-glare lever :for-
wards or back.
Exterior mirrors
Adjusting the exterior mirrors
GWARNING
You could lose control of your vehicle if you do the following while driving:
Radjust the driver's seat, head restraint,
steering wheel or mirrors
Rfasten the seat belt
There is arisk of an accident.
Adjust the driver's seat, head restraint,s teer-
ing wheel and mirror and fasten your seat belt before startin gthe engine.
GWARNING
The exterior mirror on the front-passenger
side reduces the size of the image. Visible
object sare actually closer than they appear.
This means that you could misjudge the dis-
tance from road users traveling behind, e.g.
when changing lane. There is arisk of an acci-
dent.
For this reason, always make sure of the
actual distance from the road users traveling
behind by glancing over your shoulder.
88Mirrors
Seats, steering wheela nd mirrors

Exteriorlighting
General notes
For reasonsofs afety, Mercedes-Ben zrecom-
mends that you driv ewith th elightss witched on
even durin gthe daytime. In somec ountries,
operatio noftheheadlamps varies due to legal
requirement sand self-imposedo bligations.
Settingthe exterio rlighting
Settin goptions
Exterior lighting can be set using:
Rthel ight switch
Rthec ombinatio nswitch (Ypage 94)
Rtheo n-board compute r(Ypage 172)
Light switch
Operation
1WLeft-hands tanding lamps
2 XRight-hand standing lamps
3TParking lamps ,licens eplatea nd
instrumen tcluste rlighting
4 ÃAutomatic headlampm ode, controlled
by th elight sensor
5 LLow-beam/high-beam headlamps
BRRear fog lamp
If you hear awarning tone when you leave the
vehicle ,the lightsm ay still be switched on.
XTurn thelight switch to Ã.
The exteriorl ighting (excep tthe parking/stand-
ing lamps )switches off automaticall yifyou:
Rremove th eSmartKey from th eignition lock
Ropen th edriver'sd oor with th eSmartKey in
position 0
Automatic headlamp mode
GWARNING
When th elight switch is set to Ã,thelow-
beam headlamps may no tbeswitched on
automaticall yifthere is fog ,sno woro ther
causes of poor visibilityd ue to theweather
conditionss uchasspray. Thereisar isk of an
accident.
In suchs ituations,tur nt he light switch to
L.
The automatic headlampf eature is only an aid.
The driver is responsible for th evehicle's light-
ing at all times.
à is thefavore dlight switch setting. The light
settin gisautomaticall yselecte daccording to
th eb rightnes softheambient light (exception:
poor visibilityd ue to weather conditionss uchas
fog ,sno wors pray):
RSmartKey in position 1in th eignition lock: the
parking lamps are switched on or off auto-
maticall ydependingont hebrightnes softhe
ambient light.
RWitht heengine running: if you have activated
th ed aytime runnin glamps function via the
on-board computer, th edaytime running
lamps or th eparking lamps and th elow-beam
headlamps are switched on or off automati-
cally dependingont hebrightnes softheambi-
ent light.
XTo switch on automatic headlamp mode:
tur nthe light switch to Ã.
Only for Canada:
The daytime runnin glamps improve th evisibility
of your vehicle durin gthe day. The daytime run-
nin glamps function is required by law in Can-
ada. It canno tthe refore be deactivate d.
When t

h ee ngine is runnin gand th evehicle is
stationary: if you mov ethe selecto rleve rfro ma
driv eposition to P,thedaytime runnin glamps/
low-beam headlamps go out after three
minutes.
When th eengine is running, th evehicle is sta-
tionar yand in bright ambient light:ify ou turnthe
light switch to T,thedaytime runnin glamps
and parking lamps switch on.
If th eengine is runnin gand you tur nthe light
switch to L,themanual settings tak eprec-
edence ove rthe daytime runnin glamps.
USA only:
Exterior lighting93
Lightsa nd windshield wipers
Z

The daytime runninglamps improve the visibility
of your vehicle during the day. To do this, the
daytime runnin glamps function must be
switched on using the on-board computer
(
Ypage 172).
If the engine is runnin gand you turn the light
switch to TorL,t he manual settings
take precedenceo ver the daytime running
lamps.
Low-beam headlamps
GWARNING
When the light switch is set to Ã,the 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 arisk of an
accident.
In such situations, turn the light switch to
L.
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 Lposition.
This is aparticularly useful function in the event
of rain and fog.
XTo switch on the low-beam headlamps:
turn the SmartKey in the ignition lock to posi- tion 2or start the engine.
XTurn the light switch to L.
The green Lindicator 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 noteoft he country-specific
regulations for the use of rear fog lamps.
XTo switch on the rear fog lamps: turn the
SmartKey to position 2in the ignition lock or
start the engine.
XTurn the light switch to LorÃ.
XPress the Rbutton.
The yellow Rindicator lamp in the instru-
ment cluster lights up.
XTo switch off the rear fog lamp: press the
R button.
The yellow Rindicator lamp in the instru-
ment cluster goes out.
Parking lamps
!If the battery charge is very low, the parking
lamps or standin glamps are automatically
switched off to enable the next engine start.
Always park your vehicle safely and suffi-
ciently lit according to legal standards. Avoid
using the parking lamps Toveraperiod of
several hours. If possible, switch on the right-
hand X or left-hand Wstandin glamp.
XTo switch on: turn the light switch to T.
The green Tindicator lamp in the instru-
ment cluster lights up.
Standing lamps
Switching on the standin glamps ensures the
corresponding side of the vehicle is illuminated.
XTo switch on the standing lamps: the
SmartKey is not in t
he ignition lock or it is in
position 0.
XTurn the light switch to W(left-han dside of
the vehicle) or X(right-hand side of the
vehicle).
Combination switch
:High-beam headlamps
;Turn signal, right
=High-beam flasher
?Turn signal, left
XTo indicate briefly: press the combination
switch briefly to the pressure point in the
direction of arrow ;or?.
The corresponding turn signal flashes three
times.
XTo indicate: press the combination switch
beyond the pressure point in the direction of
arrow ;or?.
94Exterior lighting
Lights and windshield wipers

XTo switchonthe high-beam headlamps:
turn the light switch to LorÃ.
XPress the combinatio nswitch beyond the
pressure point in the direction of arrow :.
In the Ãposition, the high-bea mhead-
lamps are onlys witched on when it is dark and
the engine is running.
The blue Kindicator lamp in the instru-
ment cluster lights up when the high-beam
headlamps are switched on.
XTo switc hoff the high-beam headlamps:
move the combinatio nswitch back to its nor-
malp osition.
The blue Kindicator lamp in the instru-
ment cluster goe sout.
Hazard warning lamps
XTo switc honthe hazard warning lamps:
press button :.
All turn signals flash. If yo unow switch on a
turn signalu sing the combinatio nswitch ,only
the turn signall ampont he corresponding
side of the vehicl ewillf lash.
XTo switc hoff the hazard warning lamps:
press button :.
The hazard warning lamps automaticall yswitch
on if:
Ran ai rbag is deployed or
Rthe vehicl edecelerates rapidly from aspeed
of above 45 mph (70 km/h )and come stoa
standstill
The hazard warning lamps switch off automati-
cally if the vehicl ereachesas peed of above
6m ph (10 km/h )again afteraf ullb rake appli-
cation.
iThe hazard warning lamps stil lope rate if the
ignition is switched off.
Cornerin glight function
The cornering light functio nimprove sthe illu-
minatio nofthe roa doveraw idea ngle in the
direction yo uare turning, enabling better visi-
bility in tight bends, for example. The cornering
light functio ncan onlybea ctivatedwhent he
low-bea mheadlamps are switched on.
Active:
Rif yo uare driving at speed sbelow 25 mph
(40 km/h )and switch on the turn signalo r
turn the steering wheel
Rif yo uare driving at speed sbetween 25 mph
(40 km/h )and 45 mph (70 km/h )and turn
the steering wheel
The cornering lamp mayr emainlitfor ashort
time ,but is automaticall yswitched off afte rno
more thant hreem inutes.
Cornerin glight functio nwitht rafficc ircle
function:
The cornering light functio nisa ctivate donboth
side sbefore entering atraffic circle throug han
evaluation of the current GP Sposition of the
vehicle. It remains active unti lafte rthe vehicle
hasl eftt he traffic circle .Inthisw ay,pedes trians
crossing the road, for example, are illuminated
by your vehicl eingoodt ime.
Active light function
The active light functio nisas ystem thatm oves
the headlamps according to the steering move-
ments of the front wheels .Inthisw ay,relevant
areas remai nillum inated whil edriving .This
allows yo utoidentify pedestrians ,cyclists and
animals.
Active: when the lights are switched on.
Vehicles with Lane Keeping Assist: the active
light functio nevaluate sthe course of the lane in
which yo uare driving and pre-emptively con-
trol sthe active light function.
Adaptiv eHighbeam Assist
General notes
Yo uc an us ethisf unctio ntoset the headlamps
to change between lo wbeama nd high beam
automatically. The system recognizes vehicles
with thei rlights on, either approaching from the
opposite direction or traveling in front of your
Exterior lighting95
Lights and windshield wiper s
Z

Problems with the windshield wipers
ProblemPossible causes/consequences andMSolutions
The windshield wipers
are jammed.Leaves or snow, for example, may be obstructing the windshield wiper
movement.The wiper motor has been deactivated.
XFor safety reasons, you should remove the SmartKey from the igni-
tion lock.
or
XSwitch off the engine using the Start/Stop button and open the
driver's door.
XRemove the cause of the obstruction.
XSwitch the windshield wipers back on.
The windshield wipers
fail completely.The windshield wiper drive is malfunctioning.
XSelect another wiper speed on the combination switch.
XHave the windshield wipers checked at aqualified 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.
XHave the spray nozzles adjusted at aqualified specialist workshop.
Windshield wipers101
Lights and windshieldw ipers
Z

ASwitches cooling with airdehumidification on/off (Ypage 107)
BSwitches air-recirculation mod eon/off (Ypage 111)
CSets the airflo w(Ypage 109)
DSwitches the rea rwindow defroste ron/off (Ypage 110)
Notesonu sing the air-conditioning
system
Air-conditioning system
Below,y oucan find anumber of notes and rec-
ommendations to hel pyou uset he air-condi-
tioning system optimally.
RSwitch on cooling with ai rdehumidification
using the ¿button. The indicator lamp in
the ¿ button lights up.
RSet the temperature to 72 ‡(22 †).
RRecommendation for air distributio nin
winter: set theOand¯ settings.
Recommendation for air distributio nin
summer: set thePsetting.
ROnly us ethe "Windshieldd efrosting" function
briefl yuntilthe windshield is clear again.
ROnly us eair-recirculation mod ebriefly, e.g. if
there are unpleasant outsid eodors or when in
at unnel .The window scould otherwise fog up,
since no fres hairis drawn into the vehicl ein
air-recirculation mode.
EC Os tart/stop function
During automatic engine switch-off, the climate
control system only operate satareducedcapa-
city .Ify ourequire ful lclimate control capacity,
the ECO start/stop function can be deactivated by pressing the ECO button (
Ypage 119).
104Overvie wofclimate control systems
Climate control