2017 MERCEDES-BENZ C-Class COUPE Owner's Manual

To avoid hazardous situations, alwaysmake
sure that all of the vehicle's occupants:
Rhave fastened their seat belts correctly,
including pregnant women
Rare sittin gcorrectly and maintain the great-
est possible distance to the air bags
Rfollow the following instructions
Always make sure that there are no objects
between the air bag and the vehicle's occu-
pants.
RAdjust the seats properly before beginning
your journey. Always make sure that the seat
is in an almost upright position. The center of
the head restraint must support the head at
about eye level.
RMove the driver's and front-passenger seats
as far back as possible. The driver's seat posi-
tion must allow the vehicle to be driven safely.
ROnly hold the steerin gwheel on the outside.
This allows the air bag to be fully deployed.
RAlways lean against the backrest while driv-
ing. Do not lean forwards or lean against the
door or side window. You may otherwise be in
the deployment area of the air bags.
RAlways keep your feet in the footwell in front
of the seat. Do not put your feet on the dash-
board, for example. Your feet may otherwise
be in the deployment area of the air bag.
RFor this reason, alwayss ecure persons less
than 5ft(1.50 m) tall in suitable restraint sys-
tems. Up to this height, the seat belt cannot
be worn correctly.
If ac hild is traveling in your vehicle, also
observe the followingn otes:
RAlways secure children under twelve years of
age and less than5ft(1.50 m)tallins uitable
child restraint systems.
RChil drestraint systems shoul dbeinstalle don
the rea rseats.
ROnlys ecureac hild in arearward-facing child
restraint systemont he front-passengerseat
when the front-passenge rfront ai rbag is
deactivated .Ifthe PASSENGER AIR BAG OFF
indicator lamp is permanentl ylit,t he front-
pa sseng
e
rfront ai rbag is deactivated
(Ypage 42).
RAlway sobser ve the instructions and safety
note sont he "Occupant Classification System
(OCS) "(
Ypage 49) and on "Children in the vehicle" (
Ypage 57
)inadditiontot he child
restraint system manufacturer' sinstallation
and operating instructions.
Objects in the vehicle interior may prevent
an air bag from functioning correctly. Before
starting your journey and to avoid risks resulting from the speed of the ai rbag as it deploys, make
sure that:
Rther eare no people ,animals or objects
between the vehicl eoccupants and an air
bag.
Rther eare no objects between the seat, door
and B-pillar.
Rno hard objects, e.g .coa th angers, hang on
the gra bhandles or coa thooks.
Rno accessories, such as cup holders, are
attachedtot he vehiclewithint he deployment
are aofana irbag, e.g .todoors,s idew indows,
rea rsidet rim or side walls.
Rno heavy,s harp-edged or fragile objects are in
the pockets of your clothing. Store such
objects in asuitabl eplace.
GWARNING
If yo umodify the ai rbag cove rora ffix objects
such as stickers to it, the ai rbag can no longer
functio ncorrectly. There is an increased risk
of injury.
Never modify an ai rbag cove rora ffix objects
to it.
GWARNING
Sensors to contro lthe ai rbagsa re locate din
the doors .Modifications or work not per-
formed correctl ytothe doors or door panel-
ing ,asw ellasd amag ed doors ,can lead to the
functio nofthe sensors being impaired .The air
bags might therefore not functio nproperly
anymore .Consequently ,the ai rbagsc annot
protect vehicl eoccupants as they are
designed to do .There is an increased ris kof
injury.
Never modify the doors or parts of the doors.
Alway shavew orkont he doors or door pan-
eling carrie doutataq uali fied specialist work-
shop.
Occupant safety47
Safety
Z

Frontair bags
Driver's air bag :deploys in fron tofthesteer -
ing wheel. Front-passenger fron tair bag ;
deploys in fron tofand abov ethe glov ebox.
When deployed, th efront air bags offer addi-
tional head and thorax protection for th eoccu-
pants in th efront seats.
The PASSENGER AI RBAG OFFa nd PASSENGER
AI RB AG ON indicator lamp sinform you about
th es tatus of th efront-pa ssenger air bag
(
Ypage 42).
The front-passenger fron tair bag will only
deplo yif:
Rthes ystem, based on th eOCS weigh tsensor
readings, detect sthatthe front-passenger
seat is occupied (
Ypage 49).The
PASSENGER AI RBAG ON indicator lamp is lit
(
Ypage 49)
Rth er estrain tsystem control unit predicts a
high acciden tseverit y
Knee bags
Driver's knee bag :deploys underneat hthe
steering column and front-passenger knee
bag ;underneat hthe glov ebox.T he driver' s
and front-passenger knee bags are triggered
together wit hthe fron tair bags . The driver'
sand front-passenger knee bags
offer additional thigh, knee and lower leg pro -
tection for th eoccupant sinthefron tseats.
Sidei mpact air bags
GWARNIN G
Unsuitable seat cover scould restrict or eve n
preven tthe deploymen toftheair bags inte-
grated int othe seats. Consequently, th eair
bags canno tprotect vehicl eoccupant sas
they are designed to do. In addition ,the func-
tion of th eOccupant Classification Syste m
(OCS )cou ld be restricted. This poses an
increased ris kofinjury or eve nfatal injury.
You should only use seat cover sthath ave
been approve dfor th erespective seat by
Mercedes-Benz.
Fron tside impac tair bags :and rear side
impact air bags ;deplo ynexttot heouter bol-
ster of th eseat backrest .
When deployed, th eside impac tair bag offers
additional thorax protection .How ever, it does
no tp rotect the:
Rhead
Rneck
Rarm s
In th eevent of aside impact, th eside impac tair
bag is deployed on th eside on whic hthe impac t
occurs.
The side impac tair bag on th efront-pa ssenger
side (front) deploys under th efollowin gcondi -
tions:
Rth eO CS system detect sthatthe front-
passenger seat is occupied or
Rth eb elt tongue is engage dinthebelt buckle
of th efront-pa ssenger seat
48Occupant safety
Safety

If the belt tongue is engaged in the belt buckle,
the side impact air bag on the front-passenger
side deploys if an appropriate accident situation
occurs. In this case, deployment is independent
of whether the front-passenger seat is occupied
or not.
Window curtain air bags
Window curtain air bags:are integrated into
the side of the roof frame and deployed in the
area from the A-pillartot he C-pillar.
When deployed ,the window curtain air bag
enhances the level of protection for the head.
However, it does not protect the chest or arms.
In the event of aside impact, the window curtain
air bag is deployed on the side on which the
impact occurs.
If the system determines that they can offer
additional protection to that providedbyt he
seat belt, awindow curtain air bag may be
deployed in other accident situations
(
Ypage 53).
Occupant Classification System
(OCS)
Introduction
The Occupant Classification System (OCS) cat-
egorizes the person in the front-passenger seat.
Depending on that result, the front-passenger
front air bag is either enable dordeactivated.
The system does not deactivate:
Rthe side impact air bag
Rthe window curtain air bag
Rthe Emergency Tensioning Devices
Prerequisites
To be classified correctly, the front passenger
must sit:
Rwith the seat belt fastened correctly
Rin an almos tupright positionw ith their back
against the seat backrest
Rwith their feet resting on the floor, if possible
If the front passenger does not observe these
conditions, OCS may produce afalse classifica-
tion, e.g. because the front passenger:
Rtransfers their weight by supporting them-
selves on avehicle armrest
Rsits in such away that their weight is raised
from the seat cushion
If it is absolutely necessary to install achild
restraint system on the front-passenger seat, be
sure to observe the correct positioning of the
child restraint system. Never place objects
under or behind the child restraint system, e.g.
cushions. Full yretract the seat cushio nlength.
The entire base of the child restraint system
must always rest on the seat cushio nofthe
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.
The child restraint system must not touch the
roof or be subjected to aload by the head
restraint. Adjust the angle of the seat backrest
and the head restraint positiona ccordingly.
Only then can OCS be guaranteed to function
correctly. Alway sobserve the child restraint sys-
tem manufacturer's installation and operating
instructions.
Occupant Classification System opera-
tion (OCS)
:PASSENGER AIR BAG ON indicator lamp
;PASSENGER AIR BAG OFF indicator lamp
Occupant safety49
Safety
Z

The indicator lamps inform you whether the
front-passenger front air bag is deactivated or
enabled.
XPress the Start/Stop button once or twice, or
turn the SmartKey to position1or 2in the
ignition lock.
The system carries out self-diagnostics.
The PASSENGER AIR BAG OFF and PASSENGER
AIR BAG ON indicator lamps must light up simul-
taneously for approximately six seconds.
The indicator lamps display the status of the
front-passenger front air bag.
RPASSENGER AIR BAG ON lights up: the front-
passenger front air bag is enabled. If, in the
event of an accident ,all deployment criteria
are met, the front-passenger front air bag is
deployed.
RPASSENGER AIR BAG OFF lights up: the front-
passenger front air bag is deactivated. It will
then not be deployed in the event of an acci-
dent.
If the status of the front-passenger front air bag changes while the vehicle is in motion,ana ir bag
display message appears in the instrument clus-
ter (
Ypage 229). When the front-passenger
seat is occupied, alwaysp ay attention to the
PASSENGER AIR BAG ON and PASSENGER AIR
BAG OFF indicator lamps. Be aware of the status
of the front-passenger front air bag both before
and during the journey.
GWARNING
If the PASSENGER AIR BAG OFF indicator
lamp is lit, the front-passenger front air bag is
disabled. It will not be deployed in the event of
an accident and cannot perform its intended
protective function. Aperson in the front-
passenger seat could then ,for example, come
into contact with the vehicle's interior, espe-
cially if the person is sittin gtoo close to the
dashboard. This poses an increased risk of
injury or even fatal injury.
When the front-passenger seat is occupied,
alwayse nsure that:
Rthe classification of the person in the front-
passenger seat is correcta nd the front-
passenger front air bag is enabled or disa-
bled in accordanc ewith the person in the
front-passenger seat
Rthe front-passenger seat has been moved
back as far back as possible.
Rthe person is seated correctly.
Make sure, both before and during the jour-
ney, that the status of the front-passenger
front air bag is correct.
GWARNING
If you secure achild in arearward-facing child
restraint system on the front-passenger seat
and the PASSENGER AIR BAG ON indicator
lamp is lit up, the front-passenger front air bag may deploy in an accident .The child could be
struck by the air bag. This poses an increased
risk of injury or even fatal injury.
Make sure that the front-passenger front air
bag has been disabled. The PASSENGER AIR
BAG OFF indicator lamp must be lit.
If the PASSENGER AIR BAG OFF indicator lamp
remains off and/or the PASSENGER AIR BAG
ON indicator lamp lights up, do not install arear-
ward-facing child restraint system on the front-
passenger seat. You can find more information
on OCS under "Problems with the Occupant
Classification System" (
Ypage 53).
GWARNING
If you secure achild in aforward-facing child
restraint system on the front-passenger seat
and you position the front-passenger seat too close to the dashboard, in the event of an
accident ,the child could:
Rcome into contact with the vehicle's inte-
rior if the PASSENGER AIR BAG OFF indi-
cator lamp is lit, for example
Rbe struck by the air bag if the PASSENGER
AIR BAG ON is lit up
This poses an increased risk of injury or even fatal injury.
Always move the front-passenger seat as far
back as possible and fully retrac tthe seat
cushion length. Always make sure that the
shoulder belt strap is correctly routed from
the vehicle belt sash guide to the shoulder
50Occupant safety
Safety

belt guide on the child restraint system. The
shoulder belt strap must be routed forwards
and downwards from the vehicle belt sash
guide. If necessary, adjust the vehicle belt
sash guide and the front-passenger seat
accordingly. Always observe the child
restraint system manufacturer's installation
instructions.
If OCS determines that:
Rthe front-passenger seat is unoccupied, the
PASSENGER AIR BAGO FF indicator lamp
lights up after the system self-test and
remains lit. This indicates that the front-
passenger fronta ir bag is deactivated.
Rthe front-passenger seat is occupied by a
child of up to twelve months old, in astandard
child restraint system, the PASSENGER AIR
BAGO FF indicator lamp lights up after the
system self-test and remains lit. This indi-
cates that the front-passenger fronta ir bag is
deactivated.
But even in the case of atwelve-month-old
child, in astandard child restraint system, the
PASSENGER AIR BAGONc an light up perma-
nently after the system self-test. This indi-
cates that the front-passenger fronta ir bag is
activated. The result of the classification is
dependen ton, among other factors, the child
restraint system and the child's stature. It is
recommended that you install the child
restraint system on asuitable rear seat.
Rthe front-passenger seat is occupied by aper-
son of smaller stature (e.g. ateenager or
small adult), either the PASSENGER AIR BAG
ON or PASSENGER AIR BAGO FF indicator
lamp lights up and remains lit after the system
self-test dependin gonthe result of the clas-
sification.
-If the PASSENGER AIR BAGONi ndicator
lamp lights up, move the front-passenger
seat as far back as possible. Alternatively, a
person of smaller stature can sit on arear
seat.
-If the PASSENGER AIR BAGO FF indicator
lamp is lit, aperson of smaller stature
should not use the front-passenger seat.
Rthe front-passenger seat is occupied by an
adult or aperson of adult stature, the
PASSENGER AIR BAGONi ndicator lamp
lights up after the system self-test and remains lit. This indicates that the front-
passenger fronta
ir bag is activated.
If children are traveling in the vehicle, be sure to
observe the notes on "Children in the vehicle"
(
Ypage 57).
When OCS is malfunctioning, the red 6
restraint system warning lamp in the instrument
cluster and the PASSENGER AIR BAGO FF indi-
cator lamp light up simultaneously. The front-
passenger fronta ir bag is deactivated in this
case and does not deploy during an accident.
Have the system checked by qualified techni-
cians as soon as possible. Consult an authorized
Mercedes-Benz Center .The front-passenger
seat should only be repaired at an authorized
Mercedes-Benz Center.
If the front-passenger seat, the seat cover or the seat cushion is damaged, have the necessary
repair work carried out at an authorized
Mercedes-Benz Center.
For safety reasons ,Mercedes-Benz recom-
mends that you only use seat accessories that
have been approved by Mercedes-Benz.
If the driver'sa ir bag deploys, this does not
mean that the front-passenger fronta ir bag will
also deploy. The Occupant Classification Sys-
tem (OCS) categorizes the occupant in the front-
passenger seat. Depending on that result, the
front-passenger fronta ir bag is either enabled or
deactivated.
System self-test
GDANGER
If both the PASSENGER AIR BAGO FF and
PASSENGER AIR BAGONi ndicator lamps do
not light up during the system self-test, the
system is malfunctioning. The front-
passenger fronta ir bag might be triggered
unintentionally or might not be triggered at all
in the event of an accidentw ith high deceler-
ation. This poses an increased risk of injury or
even fatal injury.
In this case the front-passenger seat may not
be used. Do not install achild restraint system
on the front-passenger seat. Have the Occu-
pant Classification System (OCS) checked
and repaired immediately at aqualified spe-
cialist workshop.
Occupant safety51
Safety
Z

GWARNING
If the PASSENGER AIR BAG OFF indicator
lamp remains lit after the system self-test, the
front-passenge rfront air bag is disabled. It will
not be deploye dinthe event of an accident. In
this case, the front-passenge rfront air bag
cannot perform its intended protective func-
tion, e.g. when apersoniss eated in the front-
passenger seat.
That personc ould, for example, come into
contact with the vehicle's interior, especially
if the personiss itting too close to the dash-
board. This poses an increased risk of injury or
even fatal injury.
When the front-passenge rseat is occupied,
alway sensure that:
Rthe classification of the personint he front-
passenger seat is correct and the front-
passenger front air bag is enabled or disa-
bledina ccordance with the personint he
front-passenge rseat
Rthe personiss eated properly with acor-
rectly fastened seatbelt
Rthe front-passenge rseat has been moved
as far back as possible
If the PASSENGER AIR BAG OFF indicator
lamp remains lit when it should not, the front-
passenger seat may not be used .Donot
instal lachild restraint system on the front-
passenger seat. Have the Occupant Classifi-
cation System (OCS) checked and repaired
immediatel yataqualified specialist work-
shop.
GWARNING
Objects between the seat surface and the
child restraint system coul daffect OCS oper-
ation. This coul dresult in the front-passenger
air bag not functioning as intended during an
accident. This posesani ncreased risk of
injury or even fatal injury.
Do not place any objects between the seat
surface and the child restraint system. The
entire base of the child restraint system must
alway srest on the seat cushion of the front-
passenger seat. The backrest of the forward-
facing child restraint system must, as far as
possible,ber esting on the backrest of the
front-passenge rseat. Always comply with the
child restraint system manufacturer's instal-
lation instructions.
After the system self-test, the PASSENGER AIR
BAG OFF or PASSENGER AIR BAG ON indicator
lamp display sthe status of the front-passenger
front air bag (
Ypag e49).
For more information about the OCS, see "Prob-
lems with the Occupant Classification System"
(
Ypag e53).
52Occupant safety
Safety

Problems with the Occupant Classification System (OCS)
Be sure to observe the notes on "System self-test"(Ypage 51).
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 49).
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.
XMake sure that the seat cushion length is fully retracted.
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. It is recom-
mended that you install the child restraint system on asuitable rear
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-
Occupant safety53
Safety
Z

tection in an accident. There is an increased
riskofi njury.
Hav ethe vehicl etowed to aquali fied special-
is tw orkshop in order to have adeployed air
ba gr eplaced.
It is important for your safety and thatofy our
passenge rtohaved eployed airb agsr eplaced
and to have any malfunctioning ai rbags
repaired .Thisw illh elptom akes uret he ai rbags
continue to perform their protective functio nfor
the vehicl eoccupants in the event of acrash.
GWARNING
Pyrotechni cEmergency Tensioning Devices
thath aveb eend eployed arenol ongero pera-
tional and ar eunabl etop erform their inten-
de dp rotective function. Thi sposes an
increasedr iskofi njury or eve nfatal injury.
Therefore ,havep yrotechni cEmergency Ten-
sioning Devices which have been triggered
immediatel yreplaced at aquali fied specialist
workshop.
An electri cmotorisu sedbyP RE-SAFE
®to trig-
ge rthe tightening of the seat belt in hazardous
situations. Thi sprocedur eisreversible.
If Emergency Tensioning Devices ar etriggered
or ai rbagsa redeployed ,you will hear abang,
and asmall amount of powder maya lsob e
released. The 6restraint systemw arning
lamp lights up.
Onlyinr arec ases will the bang affect your hear-
ing .The powder thati sreleasedg enerall ydoes
not constitute ahealth hazard, bu titmaycause
short-ter mbreathing difficultie sinpeoplewith
asthma or othe rrespiratory problems .Provided
it is safe to do so, yo ushoul dleave the vehicle
immediatel yoropent he windo winorder to pre-
vent breathing difficulties.
Air bags and pyrotechni cEmergency Tensioning
Devi ces (
ETDs) contain perchlorate material,
which mayr equire special handling and regard
for the environment. National guideline smust
be observe dduringd ispo sal. In California ,see
www.dtsc.ca.gov/HazardousWaste/
Perchlorate/index.cfm.
Methodofo peration
During the first stage of acollision, the restraint
systemc ontrolunite valuate simportant physi-
cal data relating to vehicl edeceleratio noraccel-
eration, such as:
Rduration
Rdirection
Rintensity
Based on the evaluation of thisd ata, the
restraint systemc ontrol unittriggers the Emer-
gency Tensioning Devices durin gafrontal or
rea rcollision.
An Emergency Tensioning Device can onl ybe
triggered ,if:
Rthe ignition is switched on
Rthe components of the restraint systema re
operational .You can fin dfurthe rinformation
under: "Restraint systemw arning lamp"
(
Ypage 41)
Rthe belt tongue is engaged in the buckle on
the respectiv efront-passenge rseat
The Emergency Tensioning Devices in the rear
compartment ar etriggered independentl yofthe
lock status of the seat belts.
If the restraint systemc ontrol unitdetects a
mor eseverea ccident, furthe rcomponents of
the restraint systema reactivated independ-
entl yofe acho the rinc ertainfrontal collision
situations:
RFron tairbags as well as driver's and front-
passenge rknee bags
RWindo wcurtai nairbag, if the systemd eter-
mines thatd eployment can offer additional
protection to thatp rovided bythe s
eat belt
The front-passenge rfront ai rbag is activated or
deactivated depending on the perso nonthe
front-passenge rseat. The front-passenge rfront
ai rb ag can onl ydeplo yinana ccident if the
PASSENGER AIR BAG ON indicator lamp is lit.
Observe the information on the PASSENGER AIR
BAG indicator lamps (
Ypage 42).
Your vehicl ehastwo-stage front ai rbags. During
the first deployment stage ,the front ai rbag is
fille dwithp ropellant ga storeduce the ris kof
injuries. Th efront ai rbag is full ydeployed with
the maximum amount of propellant ga sifasec-
ond deployment threshold is reache dwithina
few milliseconds.
The activatio nthreshold of the Emergency Ten-
sioning Devices and the ai rbag ared etermined
by evaluating the rate of vehicl edeceleratio nor
54Occupant safety
Safety