2017 MERCEDES-BENZ SLC-Class warning light

Problems with the Occupant Classification System (OCS)
Be sure to observe the notes on "System self-test"(Ypage 47).
ProblemPossible causes/consequences andMSolutions
The PASSENGER AIR
BAG OFF indicator lamp
lights up and remains lit,
even though the front-
passenger seat is occu-
pied by an adult oraper-
son of astature corre-
sponding to that of an
adult.The classification of the person on the front-passenger seat is incor-
rect.
XMake sure the conditionsf orac orrect classification of the person
on the front-passenger seat are met (Ypage 44).
XIf the PASSENGER AIR BAG OFF indicator lamp remains lit, the front-
passenger seat may not be used.
XHave OCS checked as soon as possible at an authorized Mercedes- Benz Center.
The PASSENGER AIR
BAG OFF indicator lamp
does not light up and/or
does not stay on.
The front-passenger seat
is:
Runoccupied
Roccupied with the
weight of achild up to
twelve months old in a
child restraint system
OCS is malfunctioning.
XMake sure there is nothin gbetween the seat cushion and the child
seat.
XMake sure that the entire base of the child restraint system rests on
the seat cushion of the front-passenger seat. The backrest of the
forward-facing child restraint system must lie as flat as possible
against the backrest of the front-passenger seat. If necessary,
adjust the position of the front-passenger seat.
XWhen installing the child restraint system, make sure that the seat belt is tight. Do not pull the seat belt tight using the front-passenger
seat adjustment .This could result in the seat belt and the child
restraint system being pulled too tightly.
XCheck for correct installation of the child restraint system.
Make sure that the head restraint does not apply aload to the child
restraint system. If necessary, adjust the head restraint accord-
ingly.
XMake sure that no object sare applying additional weight onto the
seat.
XIf the PASSENGER AIR BAG OFF indicator lamp remains off and/or
the PASSENGER AIR BAG ON indicator lamp lights up, do not install ac hild restraint system on the front-passenger seat.
XHave OCS checked as soon as possible at an authorized Mercedes-
Benz Center.
Deployment of Emergency Tensioning
Devices and air bags
Important safety notes
GWARNING
The air bag parts are hot after an air bag has
been deployed. There is arisk of injury.
Do not touch the air bag parts. Have a
deploye dair bag replaced at aqualified spe-
cialist workshop as soon as possible.
GWARNING
Ad eployeda ir bag no longer offers any pro-
tection and cannot provide the intended pro-
tection in an accident. There is an increased
risk of injury.
Have the vehicle towed to aqualified special-
ist workshop in order to have adeployeda ir
bag replaced.
For your own safety and that of your front
passenger, it is important that you have
48Occupant safety
Safety

deployed air bags replaced and faulty air bags
repaired. This will help to make sure the air bags
continue to performtheir protective function for
the vehicle occupants in the event of acrash.
GWARNING
Emergenc yTensioning Devices that have
deployed pyrotechnically are no longer opera-
tional and are unable to performt heir inten-
ded protective function .This poses an
increased risk of injury or even fatal injury.
Have pyrotechnically triggered Emergency
Tensioning Devices replaced immediately at a
qualified specialist workshop.
An electric moto risused by PRE-SAFE
®to trig-
ger the tightenin gofthe seat belt in hazardous
situations. This procedure is reversible.
If Emergenc yTensioning Devices are triggered
or air bags are deployed, you will hear abang,
and asmall amount of powder may also be
released. The 6restraint system warning
lamp lights up.
Only in rare cases will the bang affect your hear-
ing. The powder that is released generally does
not constitute ahealth hazard, but it may cause
short-term breathin gdifficulties in people with
asthma or other respiratory problems. Provided
it is safe to do so, you should leave the vehicle
immediately or open the window in order to pre-
vent breathin gdifficulties.
Air bags and pyrotechnic Emergenc yTensioning
Devices (ETDs) contain perchlorate material,
which may require special handling and regard
for the environment. National guidelines must
be observed during disposal. In California, see
www.dtsc.ca.gov/HazardousWaste/
Perchlorate/index.cfm .
Method of operation
Duringthe first stage of acollision, the restraint
system control unit evaluates important physi-
cal data relatin gtovehicle deceleration or accel-
eration ,such as:
Rduration
Rdirection
Rintensity
Based on the evaluation of this data, the
restraint system control unit triggers the Emer-
genc yTensioning Devices during afrontal or
rear collision. An Emergenc
yTensioning Devic ecan only be
triggered, if:
Rthe ignition is switched on
Rthe component softhe restraint system are
operational. You can find further information
under: "Restraint system warning lamp"
(
Ypage 37)
Rthe belt tongue has engaged in the belt buckle
of the respective seat
If the restraint system control unit detects a
more severe accident, further component sof
the restraint system are activated independ-
ently of each other in certain frontal collision
situations:
RFronta ir bags as well as driver'sa nd front-
passenger knee bags
The front-passenger fronta ir bag is activated or
deactivated dependin gonthe person on the
front-passenger seat. The front-passenger front
air bag can only deploy in an accidentift he
PASSENGER AIR BAGONi ndicator lamp is lit.
Observe the information on the PASSENGER AIR
BAGi ndicator lamps (
Ypage 38).
Your vehicle has two-stage fronta ir bags. During
the first deployment stage, the fronta ir bag is
filled with propellant gas to reduce the risk of
injuries. The fronta ir bag is fully deployed with
the maximum amount of propellant gas if asec-
ond deployment threshold is reached within a
few milliseconds.
The activation threshold of the Emergenc yTen-
sionin gDevices and the air bag are determined
by evaluating the rate of vehicle deceleration or
acceleration which occurs at various point sin
the vehicle. This processisp re-emptive in
nature. Deploymen tshould take place in good
time at the start of the collision.
The rat

e of vehicle deceleration or acceleration
and the direction of the forcea re essentially
determined by:
Rthe distribution of forces during the collision
Rthe collision angle
Rthe deformation characteristic softhe vehicle
Rthe characteristic softhe objec twith which
the vehicle has collided
Factors which can only be seen and measured
after acollision has occurred do not play adeci-
sive role in the deployment of an air bag. Nor do
they provide an indication of air bag deploy-
ment.
The vehicle can be deformed considerably, with-
out an air bag being deployed. This is the case if
Occupant safety49
Safety
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Resetting triggeredNECK-PRO head
restraints
Do not insert your finger between the upholstery of the hea drestraint and the seat. Payp articular
attention whil eresetting the NECK-PROh ead
restraints.
XTilt the top of the NECK-PROh eadr estraint
cushio nforward sinthe direction of arrow :.
XPush the NECK-PROh eadr estraint cushion
dow nasfar as it will go in the direction of
arrow ;.
XFirmly push the NECK-PROh eadr estraint
cushio nbackint he direction of arrow =until
the cushio nengages.
XRepea tthis procedure for the second NECK-
PROh eadr estraint.
iResetting the NECK-PROh eadr estraints
requires alot of strength. If yo uhaved ifficulty
resetting the NECK-PROh eadr estraints, have
this work carrie doutataq uali fied specialist
workshop.
PRE-SAFE®(anticipatory occupant
protection system)
PRE-SAFE®informs yo uofcertain critical driving
situations and take spre-emptive measures to
protect the vehicl eoccupants.
PRE-SAFE
®can take the following measures
independentl yofeacho ther:
Rpre-tensioning the driver' sand front-
passenger seatbelt.
Rclosing the sid ewindows.
Rvehicles with amemory function: setting a
more favorabl eseatp osition for the front-
passenger seat.
!Make sure that there are no objects in the
footwell or behind the seats. There is adanger
that the seats and/or objects could be dam-
aged when PRE-SAFE
®is activated.
Should an accident not occur, the preventative
measures take nare reversed. Certai nsettings
mus tbem adey ourself.
XIf the sea tbeltp re-tensioning is not reduced,
move the sea tbackrest back slightly.
Seatb eltp re-tensioning is released.
Automatic measures after an acci-
dent
Immediately afte ranaccident, the following
measures are implemented, depending on the
typ eand severity of the impact:
Rthe hazard warning lamps are activated
Rthe emergency lighting is activated
Rthe vehicl edoors are unlocked
Rthe front sid ewindow sare lowered
Rvehicles with amemory function: the electri-
cally adjustabl esteering wheel is raised
Rthe engine is switched off and the fue lsuppl y
is cut off
Rvehicles with mbrace: automatic emergency
call
Childrenint he vehicle
Important safety notes
Ifac hild younger than twelve years olda nd
under 5ft(1.50 m) in height is traveling in the
vehicle:
Ralways secur ethe child in achild restraint
systems uitabl efor Mercedes-Benz vehicles.
The child restraint systemm ustbea ppropri-
ate to the age, weight and size of the child
Rbe sure to observe the instructions and safety
note sint hissectio nina dditiontot he child
restraint systemm anufacturer's installation
instructions
Rbe sure to observe the instructions and safety
note sont he "Occupant classification system
(OCS) "(
Ypage 44)
Children in the vehicle51
Safety
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GWARNING
If you leave children unsupervised in the vehi-
cle, they coul dset it in motion by, for example:
Rrelease the parking brake.
Rshift the automatic transmission out of the
parking position P.
Rstart the engine.
In addition, they may operate vehiclee quip-
ment and become trapped. There is arisk of
an accident and injury.
When leaving the vehicle, alway stake the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
GWARNING
If persons, particularl ychildren are subjected
to prolonged exposure to extreme heato r
cold, there is arisk of injury ,possibly even
fatal .Never leave children unattended in the
vehicle.
GWARNING
If the child restraint system is subjected to
direct sunlight, parts may get very hot. Chil-
dren may burn themselves on these parts,
particularl yonthe metal parts of the child
restraint system. There is arisk of injury.
If you leave the vehicle, taking the child with
you ,alway sensure that the child restraint
system is not exposedtod irect sunlight. Pro-
tect it with ablanket, for example. If the child
restraint system has been exposedtod irect
sunlight, let it cool downb efore securing the
child in it. Never leave children unattended in
the vehicle.
Always ensure that all vehicleo ccupants have
their seat belts fastened correctly and are sitting
properly.P articular attention must be pai dto
children.
Observe the safety notes on the seat belt
(
Ypag e39) and the notes on correct use of seat
belts (Ypag e40).
Ab ooster seat may be necessary to achieve
propers eat beltp ositioning for children over
41 lbs (18 kg )until they reach aheight where a three-point seat beltc
an be properly fastened
without abooster seat.
Special seat bel tretractor
GWARNING
If the seat beltisr eleased while driving, the
child restraint system wil lnolonger be
secure dproperly.T he special seat beltr etrac-
tor is disable dand the inertia real draw sina
portion of the seat belt. The seat beltc annot
be immediatel yrefastened. There is an
increased risk of injury,p ossibly even fatal.
Stop the vehiclei mmediately, paying atten-
tion to road and traffic conditions. Reactivate
the special seat beltr etractor and secure the
child restraint system properly.
The seat beltont he front-passenge rside is
equipped with aspecial seat beltr etractor.
When activated, the special seat beltr etractor
ensure sthat the seat beltw illn ot slacken once
the child restraint system has been secured.
Installing achild restraint system:
XAlways comply with the child restraint system
manufacturer's installation instructions.
XPul lthe seat belts moothly out of the belt
loop.
XEngage the seat beltt ongue in the beltbuckle.
Activating the special seat beltr etractor:
XPullthe seat belto ut fullyand let the inertia
reel retract it again.
Whil ethe seat beltisr etracting, you should
hear aratcheting sound .The special seat belt
retractor is activated.
XPush the child seat restraint system downs o
that the seat beltist ight and does not loosen.
Removing achild restraint system and deacti-
vating the special seat beltr etractor:
XAlways comply with the child restraint system
manufacturer's installation instructions.
XPress the release button of the beltb uckle,
hold the beltt ongue firmly and guide it back
toward sbeltl oop.
The special seat beltr etractor is deactivated.
52Children in the vehicle
Safety

good time, and for staying in lane. Always adapt
your driving style to suit the prevailing road and
weather conditions and maintainasafe distance
from the vehicle in front.D rive carefully.
The driving safety systems described only work
as effectively as possible when there is ade-
quate contact between the tires and the road
surface. Pay particular attention to the informa-
tion regarding tires, recommended minimum
tire tread depths etc. in the "Wheels and tires"
section (
Ypage 255).
In wintry driving conditions, always use winter
tires (M+S tires) and if necessary, snow chains.
Only in this way will the driving safety systems
described in this section work as effectively as
possible.
ABS (Anti-lock Braking System)
General information
ABS regulates brake pressure in such away that
the wheels do not lock when you brake. This
allows you to continue steering the vehicle when
braking.
The ! ABS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goes out when the engine is running.
ABS works from aspeed of about 5mph
(8 km/h), regardless of road-surface conditions.
ABS works on slippery surfaces, even when you
only brake gently.
Important safety notes
iObserve the "Important safety notes" sec-
tion (Ypage 54).
GWARNING
If ABS is faulty, the wheels could lock when
braking. The steerability and braking charac-
teristics may be severely impaired. Addition-
ally,f urther driving safety systems are deac-
tivated. There is an increased danger of skid-
ding and accidents.
Drive on carefully. Have ABS checked imme-
diately at aqualified specialist workshop.
When ABS is malfunctioning, other systems,
including driving safety systems, will also
become inoperative. Observe the information
on the ABS warning lamp (
Ypage 204) and dis- play messages which may be shown in the
instrument cluster (
Ypage 179).
Braking
XIf ABS intervenes:
continue to depress the
brake pedal vigorously until the braking sit-
uation is over.
XTo make afull brake application: depress
the brake pedal with full force.
If ABS intervenes when braking, you will feel a
pulsing in the brake pedal.
The pulsating brake pedal can be an indication
of hazardous road conditions, and functions as a reminder to take extr acare while driving.
BAS (Brake Assist System)
General information
BAS operates in emergencyb raking situations.
If you depress the brake pedal quickly, BAS
automatically boosts the braking force, thus
shortening the stopping distance.
Important safety notes
iObserve the "Important safety notes" sec-
tion (Ypage 54).
GWARNING
If BAS is malfunctioning, the braking distance
in an emergencyb raking situation is
increased. There is arisk of an accident.
In an emergencyb raking situation, depress
the brake pedal with full force. ABS prevents
the wheels from locking.
Braking
XKeep the brake pedal firmly depressed until
the emergencyb raking situation is over.
ABS prevent sthe wheels from locking.
The brakes will function as usual once you
release the brake pedal. BAS is deactivated.
Driving safety systems55
Safety
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Function
Starting at aspeedofa pproximately 4mph
(7 km/h), th edistanc ewarning function warns
you ifyou rapid ly approachav ehicle in front. An
intermittentw arning tonewillthen sound, and
the · distancewarning lamp willlight up in
th ei nstrumen tcluster.
XBrake immediately inorder to increas ethe
dist ancefromt heveh icle in front.
or
XTakee vasive action,p rovide ditiss afe todo
so.
Due to th enature of th esystem, particularly
co mpli cated but non-critical driving conditions
may also caus ethe system to displayaw arning.
Witht hehelp of th eradar sensor system, the
dist ancewarning function can detect obstacles
that are inthep athofy our veh iclefor an exten-
ded period of time.
Up to aspeedofa pproximately 44 mph
(70 km/ h),t he distance warnin gfunction can
also react to stationary obstacles, such as stop-
ped or parked vehicles.
Autonomous braking function
If the driver does not react to the distance warn-
ing signal in acritical situation, Active Brake
Assis tcan assist with the autonomous braking
function.
If the autonomous brakin gfunction requires a
particularly high brakin gforce, preventative
passenger protection measures (PRE-SAFE
®)
are activated simultaneously.
Vehicles without Distance Pilot DISTRONIC:
the autonomous brakin gfunction is available in
the following speed ranges:
R4-65m ph (7-105 km/ h)for moving objects
R4-31m ph (7-50km/h)for stationary
objects
Vehicles with Distance Pilot DISTRONIC: the
autonomous braking function is available in the
following speedr anges:
R4-124 mph (7 -200 km/h )for moving
objects
R4-31m ph (7-50km/h)for stationary
objects
Due to the nature of the system ,particularly
complicated but non-critical driving conditions
may als ocaus ethe Autonomou sBraking Func-
tion to intervene. If the autonomous braking function requires a
particularly high braking force, preventative
passenger protection measures (PRE-SAFE
®)
are activated simultaneousl y(Ypage51).
Adaptive Brake Assist
General information
iObservet he "Important safety notes" sec-
tion (Ypag e54).
With the help of adaptive Brake Assist, the dis-
tance warning signa lcan detect obstacles that
are in the path of you rvehiclef or an extended
period of time.
If adaptive Brake Assist detects arisk of colli-
sion with the vehicl einfront, it calculate sthe
braking force necessary to avoi dacollision. If
you apply the brakes forcefully ,adaptive Brake
Assist wil lautomatically increas ethe braking
force to alevels uitabl efor the traffic conditions.
Adaptive Brake Assist provides braking assis-
tance in hazardouss ituations at speeds above
4m ph (7 km/h) .Itusesrada rsensor technology
to assess the traffic situation.
Up to aspeedofa pproximately 155 mph
(250 km/h) ,adaptive Brake Assist is capable of
reacting to moving objects that have already
been detected as such at least once over the
period of observation.
Up to aspeedofa pproximately 44 mph
(70 km/h), adaptive Brake Assist reacts to sta-
tionary obstacles.
If adaptive Brake Assist demands particularly
high braking force, preventative passenger pro-
tection measures (PRE-SAFE
®)a re activated
simultaneousl y(Ypage51).
XKeep the brake pedald epressed until the
emergency braking situation is over.
ABS prevents the wheels from locking.
The brakes wil lwork normally again if:
Ryou release the brake pedal.
Rthere is no longe rany dange rofacollision.
Rno obstacle is detected in front of you rvehi-
cle.
Adaptive Brake Assist is then deactivated.
Driving safety systems57
Safety
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Important safety notes
GWARNING
Adaptive Brake Assist canno talways clearly
iden tifyo bject sand co mplextraffic situa-
tions.
In suchc ases, Adaptive Brake Assist can:
Rinterveneu nnecessarily
Rnotintervene
Thereisar iskofana cciden t.
Always pay careful attentio ntothetraff icsit-
uation and beread ytob rake. Terminate the
interventio ninanon-criticaldriving situation.
GWAR NING
Adaptive Brake Assist does no treact:
Rto people or animals
Rto oncomin gvehicle s
Rto crossing traff ic
Rwhen cornering
As aresult, th eAdaptive Brake Assist may not
interveneina llcritical conditions. Thereisa
ris kofana cciden t.
Always pay careful attentio ntothetraff icsit-
uation and beread ytob rake.
Due to th enature of th esystem, particularly
co mpli cated but non-critical driving conditions
may also caus eBrake Assist to intervene.
If adaptive Brake Assist isno tavailab ledue to a
malfunctio nintheradar sensor system, the
brak esystem remains availab le withfull brake
boostin geffect and BA S.
ESP®(Electronic Stability Program)
General notes
iObserv ethe "Im portan tsafety notes" sec-
tio n(Ypage 54).
ESP
®monitors driving stabilit yand traction,i .e.
power transmission between th etires and the
road surface.
If ESP
®detect stha tthe veh icle is deviating from
th ed irection desired bythed river, oneorm ore
wheelsa re braked to stabiliz ethe veh icle.The
engineo utputisalso mod ifiedtok eept he veh i- cle on th
edesired course within physical limits.
ESP
®assists th edriver when pullingaway on
wet or slippery roads. ESP®can also stabilize
th ev ehicle durin gbraking.
ETS (Electronic Traction System)
iObserv ethe "Importan tsafety notes" sec-
tio n(Ypage 54).
ET St raction control is part of ESP
®.
ET Sb rakes th edrivew heelsi ndivid ually if they
spin.T his enables you to pull away and acceler-
ate on slippery surfaces, for example if th eroad
surface is slippery on ones ide.Inaddition,m ore
drivet orque istransferred to th ewheel or
wheelsw itht raction.
ET Sr emains active when you deactivate ESP
®.
Important safety notes
GWARNING
If ESP
®is malfunctioning, ESP®is unab leto
stabilizet hevehicle .Add itionally, further driv-
ing safety systems are deactivate d.This
increases th eriskofs kiddin gand an accident.
Drive on carefully. Hav eESP
®checked at a
qualified specialist workshop.
When to wingthe vehicle witht herear axle
raised, observ ethe note sonE SP
®
(Ypage 252).
If the å ESP®OFFw arning lamp lightsu p
continuously, then ESP®is deactivate d.
If the ÷ ESP®warning lamp and the å
ESP®OFFw arning lamp are lit continuously,
ESP®is no ta vailab ledue to amalfunction.
Observ ethe information on warning lamps
(
Ypage 205) and display messagesw hichmay
be shown in thei nstrumen tcluster
(
Ypage 179).
iOnly use wheelsw itht he recommended tire
sizes. Only then willESP®function properly.
Characteristics of ESP®
General information
Ifthe ÷ ESP®warning lamp goes out before
beginnin gthe journey, ESP®is automatically
active.
58Driving safety systems
Safety

If ESP®intervenes, the÷ESP®warning lamp
flashe sinthe instrument cluster.
If ESP
®intervenes:
XDo not deactivate ESP®under any circum-
stances.
XOnly depresst he accelerator pedalasf ar as
necessary when pulling away.
XAdapt you rdriving style to suit the prevailing
road and weather conditions.
ECO start/stop function
The ECO start/stop function switches the
engine off automatically when the vehicle stops
moving. The engine starts automatically when
the driver wants to pul lawa ya gain. ESP
®
remains in its previously selected status, e.g. if
ESP®was deactivated before the engine was
automatically switched off.
Deactivating/activating ESP®(except
SLC 43 AMG)
Important safety notes
iObserve the "Important safety notes" sec-
tion (Ypage 54).
You can select between the following states of
ESP
®:
RESP®is activated.
RESP®is deactivated.
GWARNING
If you deactivate ESP
®,E SP®no longer sta-
bilizes the vehicle.T here is an increased risk
of skidding and an accident.
Only deactivate ESP
®in the situations descri-
bed in the following.
It may be best to deactivate ESP
®in the follow-
ing situations:
Rwhen using snow chains
Rin deep snow
Ron sand or gravel
Spinning the wheel sresults in acutting action
which providesb etter grip.
iActivate ESP®as soon as the situations
describeda bove no longer apply. ESP®will
otherwise not be abl etostabilize the vehicle if the vehicle starts to skid or
awheel starts to
spin.
!Avoid spinning the driven wheel sfor an
extended period with ESP®deactivated. You
could otherwise damage the drivetrain.
Deactivating/activating ESP®
XTo deactivate: press button:.
The å ESP®OFF warning lamp in the
instrument cluster lights up.
XTo activate: press button :.
The å ESP®OFF warning lamp in the
instrument cluster goes out.
Characteristic swhen ESP®is deactivated
If ESP®is deactivated and one or more wheels
start to spin, the ÷ESP®warning lamp in the
instrument cluster flashes. In such situations,
ESP
®wil lnot stabilize the vehicle.
If you deactivate ESP®:
RESP®no longer improves driving stability.
REngine torque is no longer limited and the
drive wheel sare abl etospin.
RTraction control is still activated.
RActive Brake Assist is not available and is not
activated even if you brake firmly with assis-
tance from ESP
®
RPRE-SAFE®is no longer available, nor is it
activated if you brake firmly and ESP®inter-
venes.
RESP®still providess upport when you brake
firmly.
Driving safety systems59
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