MERCEDES-BENZ C-CLASS SALOON 2018 Service Manual

000E
NO
TEDeployment of the seat belt ten‐
sioner when the front passenger seat is
unoccupied If
th e seat belt tongue is engaged in the seat
belt buckle of the unoccupied front
passenger seat, the seat belt tensioner may
also depl oyintheev ent of an accident along
with other sy stems. 0007
Only one person should use each seat
belt at any one time. Seat belt adjustment function
Ve
hicles with PRE-SAFE ®
:if th e front seat belt
is not pulled tight across your body, the seat belt
adjustment may automatically apply a cer tain
tigh tening forc e. Do not hold the seat belt tightly
while it is adjusting.
Yo u can activate and deactivate the seat belt
adjustment function using the multimedia sys‐
te m (0013 page 38). Re
leasing a seat belt 0007
Press there lease button in the seat belt
buckle and guide the seat belt back with the
seat belt tongue. Ac
tivating/deactivating seat belt adjustment
via the multimedia sy stem Multimedia sy
stem:
0018 Vehicle 0019
î Vehicle settings
0019 Belt adjustment 0007
Activate 0073or deacti vate 0053 the function. Seat belt
warning function for the driver and
front passen ger The
00E9 seat belt warning lamp in the instru‐
ment display is a reminder that all vehicle occu‐
pants must weartheir seat belts cor rectly.
In addition, a warning tone may sound.
As soon as the driver and front passenger fasten
th eir seat belts, the seat belt warning goes out. Fu
nction of there ar seat belt status display The
rear seat belt status display is on lyavailable
fo r cer tain countries. The
rear seat belt status display informs you
which rear seat belt is not fastened.
Yo u can immediately dismiss there ar seat belt
st atus display using the back button on the left-
hand side of thesteering wheel
(0013 page271). 38
Occupant saf ety

Airbags
Overview of airbags
1
Knee airbag
2 Driver's airbag
3 Front passenger front airbag
4 Window airbag
5 Side impact airbag
The ins tallation location of an airbag is identified
by the AIRB AGsymbol.
When activated, an airbag can pr ovide additional
pr otection forth ere spective vehicle occupant. Pot
ential pr otection from each airbag: AIRB
AG Potential pr otection for
…
Knee airbag Thigh, knee and lo wer leg
Driver's airbag,
front passenger
front airbag Head and
ribcage
Wi ndow airba gHead
Side impact air‐
bag Ribcage, also pelvis
for
front seat occupants The front passenger front airbag can only be
depl
oyed in an accident if thePA SSENGER AIR
BA G OFF indicator lamp is off. If the front
passenger seat is occupied, make sure, bo th
before and during the journe y,that thest atus of
th e front passenger front airbag is cor rect
(0013 page 43). 000E
NO
TEImpo rtant points toremember if
th e front passenger seat is unoccupied In an accident,
the components of the
re stra int sy stem may deploy unnecessarily
on the front passenger side if:
R There are heavy objects on the front
passenger seat.
R The seat belt tongue is engaged in the
seat belt buckle of the front passenger
seat and the front passenger seat is
unoccupied. 0007
Stow objects in a suitable place. 0007
Only one person should use each seat
belt at any one time. Pr
otection bythe airbags Depending on
the accident situation, an airbag
may supplement the pr otection of fere dby a cor‐
re ctly fastened seat belt. Occupant saf
ety39

000A
WARNING Risk of inju ryor death due to
incor rect seat position
If yo u deviate from the cor rect seat position,
th e airbag cann otper form its intended pro‐
te ctive function and deployment may even
cause fur ther injuries.
To avo id hazardous situations, alw ays make
sure that all vehicle occupants:
R Have their seat belt fastened cor rectly,
including pregnant women.
R Are seated properly and keep as faraw ay
as possible from the airbags.
R Obser vethefo llowing information. 0007
Alw ays make sure that there are no
objects between the airbag and vehicle
occupant. To
avo idtherisks resulting from the deployment
of an airbag, each vehicle occupant must
obser vethefo llowing information:
R Before starting your journe y,adjust your seat
co rrectly ;th e driver's seat and front passenger seat should be mo
ved as far back
as possible.
When doing so, alw ays obser vethe informa‐
tion on the cor rect driver's seat position
(0013 page 100).
R Onlyhold thesteering wheel bythesteering
wheel rim. This allow sth e airbag tobe fully
deplo yed.
R Alw ays lean against the seat backrest when
th eve hicle is in motion. Do not lean forw ards
or against the door or side windo w.You may
ot herwise be in the deployment area of the
airbags.
R Alw ayske ep your feet on thefloor. Do not
put your feet on the cockpit, forex ample.
Yo ur feet may otherwise be in the deploy‐
ment area of the airbag.
R Ifch ildren are tra velling in theve hicle,
obser vethe additional no tes
( 0013 page 48).
R Alw aysstow and secure objects cor rectl y. Objects in
theve hicle interior may pr event an
airbag from functioning cor rectl y.Each vehicle
occupant must alw ays make sure of thefo llow‐
ing:
R There are no people, animals or objects
between theve hicle occupants and an air‐
bag.
R There are no objects between the seat, door
and door pillar (B-pillar).
R There are no hard objects, e.g. coat hangers,
hanging on the grab handles or coat hooks.
R There are no accessory parts, such as PNDs
(Personal Navigation Devices), mobile
phones or cup holders attached totheve hi‐
cle within the deployment area of an airbag,
e.g. on the cockpit, on doors, side windo ws
or side panelling.
In addition, no connecting cable, tensioning
st ra p or retaining stra p may be routed
th ro ugh or attached in the deployment area
of an airbag. Alw ays obser vethe accessory
manufacturer's ins tallation instructions, in
particular the information on suitable places
fo r ins tallation. 40
Occupant saf ety

R
There are no heavy, sharp-edged or fragile
objects in the poc kets of your clo thing. Store
such objects in a suitable place. Limited pr
otection from airbags 000A
WARNING Risk of inju rydue tomodifi‐
cations tothe airbag co ver
If yo u modify the co ver of an airbag or af fix
objects such as sticke rs to it,the airbag may
no longer function cor rectly. 0007
Never modify the co ver of an airbag and
do not af fix objects toit. The ins
tallation location of an airbag is identified
by the AIRB AGsymbol (0013 page 39). 000A
WARNING Risk of inju ryor death due to
th e use of unsuitable seat co vers
Un suitable seat co vers can obstruct or pre‐
ve nt the deployment of the airbags integra‐
te d into the seats. Consequentl
y,the airbags cann otprotect
ve hicle occupants as they are designed to
do. In addition, the operation of the auto‐
matic front passenger airbag shutoff could
be restricted. 0007
You should on lyuse seat co vers that
ha ve been appr oved forth e cor respond‐
ing seats byMercedes-Benz. 000A
WARNING Risk of inju rydue tomalfunc‐
tions of the sensors in the door panelling
Sensors tocontrol the airbags are located in
th e doors. Modifications or worknot per‐
fo rm ed cor rectly tothe doors or door panel‐
ling, as well as damaged doors, can lead to
th e function of the sensors being impaired.
The airbags might therefore not function
proper lyany more.
Consequent ly,th e airbags cann otprotect
ve hicle occupants as they are designed to
do. 0007
Never modify the doors or parts of the
doors. 0007
Alw ays ha vewo rkon the doors or door
panelling car ried out at a qualified spe‐
cialist workshop. 000A
WARNING Risk of inju rydue todeplo yed
airbag
A deplo yed airbag no longer of fers any pro‐
te ction and cannot pr ovide the intended pro‐
te ctive function in theeve nt of an accident. 0007
Have theve hicle towe dto aqu alified
specialist workshop in order tohave the
deplo yed airbag replaced. Ha
ve deplo yed airbags replaced immediately. St
atus of the front passenger front airbag Fu
nction of the automatic front passenger
front airbag shu toff
The automatic front passenger front airbag shut‐
off is able todetect whe ther the front passenger
seat is occupied bya person or a child restra int
sy stem. The front passenger front airbag is ena‐
bled or disabled accordingly. Occupant saf
ety41

When
fitting a child restra int sy stem tothe front
passenger seat, alw ays make sure of thefo llow‐
ing:
R Ensure that thech ild restra int sy stem is posi‐
tioned cor rectly (0013 page 54).
R Alw ays obser vethech ild restra int sy stem
manufacturer's ins tallation instructions.
R Never place objects, e.g. cushions, under or
behind thech ild restra int sy stem.
R Fully retract the seat cushion length adjust‐
ment.
R The entire base of thech ild restra int sy stem
must alw aysre st on the sitting sur face of the
front passenger seat.
R The backrest of thefo rw ard-facing child
re stra int sy stem must, as far as possible, be
re sting on the seat backrest of the front
passenger seat.
R The child restra int sy stem must not touch the
ro of or be put under stra in by the head
re stra ints. Adjust the seat backrest inclina‐
tion and the head restra int setting accord‐
ing ly. 000A
WARNING Risk of inju ryor death due to
objects between the seat sur face and
th ech ild restra int sy stem
Objects between the seat sur face and the
ch ild restra int sy stem could af fect the func‐
tion of the automatic front passenger front
airbag shutoff.
This could result in the front passenger front
airbag not functioning as intended during an
accident. 0007
Do not place any objects between the
sitting sur face and thech ild restra int
sy stem. 0007
The entire base of thech ild restra int
sy stem must alw aysre st on the sitting
sur face of the front passenger seat. 0007
The backrest of thefo rw ard-facing child
re stra int sy stem must, as far as possi‐
ble, be resting on the seat backrest of
th e front passenger seat. 0007
Alw ays comply with thech ild restra int
sy stem manufacturer's ins tallation
instructions. A person on
the front passenger seat must
obser vethefo llowing information:
R Fasten seat belts cor rectly (0013 page 34).
R Sit in an almost upright seat position with
their back against the seat backrest.
R Sit with their feet resting on thefloor, if pos‐
sible.
The front passenger front airbag may otherwise
be disabled bymis take ,fo rex ample in thefo l‐
lowing situations:
R The front passen ger transfers their weight by
supporting themselves on a vehicle armrest.
R The front passenger sits in such a wayth at
th eir weight is raised from the sitting sur‐
fa ce. 000A
WARNING Risk of inju ryor death due to
deactivated front passenger airbag
If th ePA SSENGER AIRB AGOFF indicator
lamp is lit, the front passenger airbag is disa‐
bled. It will not be deplo yed in theeve nt of
an accident and cannot pe rform its intended
pr otective function. 42
Occupant saf ety

A pe
rson in the front passenger seat could
th en, forex ample, come into con tact wi th
th eve hicle interior, especially if the person is
sitting too close tothe cockpit.
If th e front passenger seat is occupied,
alw ays ensure that:
R The classification of the person in the
front passenger seat is cor rect and the
front passenger airbag is enabled or disa‐
bled in accordance with the person in the
front passenger seat.
R The front passenger seat has been mo ved
as far back as possible.
R The person is seated cor rectl y. 0007
Ensu re, bo thbefore and during the jour‐
ne y,that thest atus of the front
passenger airbag is cor rect. If
th e front passenger seat is occupied, the clas‐
sification of the person or child restra int sy stem
on the front passenger seat take s place af terthe
front passenger front airbag shutoff self-test.
The PASSENGER AIR BAG indicator lamps dis‐ play
thest atus of the front passenger front air‐
bag.
Alw ays obser vethe no tes on the function of the
PA SSENGER AIR BAG indicator lamps
(0013 page 43).
Fu nction of thePA SSENGER AIR BAG indica‐
to r lamps Ve
hicles without automatic front passenger front
airbag shutoff ha vea special sticke r af fixe dto
th e side of the cockpit on the front passenger
side (0013 page67).
Self-test of automatic front passenger front
airbag shutoff
When the ignition is switched on, a self-test is
per form ed during which the two PASSENGER
AIR BAG ON and OFF indicator lamps light up
simul taneously.
The status of the front passenger front airbag is
displa yed af terth e self-tes t:
R PASSENGER AIR BAG ON lights up for
60 seconds, subsequently bo thindicator
lamps are off (PASSENGER AIR BAG ON and
OFF): the front passenger front airbag is able
to deploy in theeve nt of an accident.
R PASSENGER AIR BAG OFF lights up continu‐
ously: the front passenger front airbag is dis‐
abled. It will then not be deplo yed in the
eve nt of an accident.
If th ePA SSENGER AIR BAG ON indicator lamp is
off, on lythePA SSENGER AIR BAG OFF indicator
lamp sho wsthest atus of the front passenger Occupant saf
ety43

front airbag. The
PASSENGER AIR BAG OFF indi‐
cator lamp may be lit continuously or be off.
If th ePA SSENGER AIR BAG OFF indicator lamp
and the0075 restra int sy stem warning lamp
light up simultaneousl y,the front passenger seat
may not be used. Also in this case, do not fit a
ch ild restra int sy stem tothe front passenger
seat. Ha veautomatic front passenger front air‐
bag shutoff checked and repaired immediately at
a qu alified specialist workshop.
St atus display
If th e front passenger seat is occupied, ensure,
bo th before and during the journe y,that thest a‐
tus of the front passenger front airbag is cor rect
fo rth e cur rent situation.
Af terfitting a rear wa rd-facing child restra int
sy stem tothe front passenger seat:
PA SSENGER AIR BAG OFF must be lit continu‐
ousl y. 000A
WARNING Risk of inju ryor death from
using a rear wa rd-facing child restra int
sy stem when the front passenger front
airbag is enabled
If yo u secure a child in a rear wa rd-facing
ch ild restra int sy stem on the front passenger
seat and thePA SSENGER AIR BAG OFF indi‐
cator lamp is off, the front passenger airbag
can deploy in theev ent of an accident.
The child could be stru ck bythe airbag.
Alw ays ensure that the front passenger air‐
bag is disabled. The PASSENGER AIR BAG
OFF indicator lamp must be lit.
NEVER use a rear wa rd-facing child restra int
sy stem on a seat pr otected byan ENABLED
FRONT AIRB AGin front of it, DE ATH or SERI‐
OUS INJU RYtotheCH ILD can occur. When
fitting a child restra int sy stem tothe front
passenger seat, obser vetheve hicle-specific
information (0013 page 68).
Depending on thech ild restra int sy stem and the
st ature of thech ild, thePA SSENGER AIR BAG
OFF indicator lamp may be off. In this case, do not
fit th ere ar wa rd-facing child restra int sy stem
to the front passenger seat.
Ins tead, fit th ere ar wa rd-facing child restra int
sy stem toa suitable rear seat.
Af terfitting a forw ard-facing child restra int
sy stem tothe front passenger seat: depend‐
ing on thech ild restra int sy stem and thest ature
of thech ild, PASSENGER AIR BAG OFF may be lit
continuously or be off. Alw ays obser vethefo l‐
lowing information. 000A
WARNING Risk of inju ryor death due to
incor rect positioning of thefo rw ard-
fa cing child restra int sy stem
If yo u secure a child in a forw ard-facing child
re stra int sy stem on the front passenger seat
and you position the front passenger seat too
close tothe cockpit, in theev ent of an acci‐
dent, thech ild could:
R Come into con tact wi th theve hicle inte‐
ri or if thePA SSENGER AIR BAG OFF indi‐
cator lamp is lit, forex ample.
R Bestru ck bythe airbag if thePA SSENGER
AIR BAG OFF indicator lamp is off. 44
Occupant saf ety

0007
Alw ays mo vethe front passenger seat
as far back as possible and fully retract
th e seat cushion length adjustment.
Alw ays make sure that the shoulder belt
st ra p is cor rectly routed from the seat
belt outlet on theve hicle tothe shoul‐
der belt guide on thech ild restra int sys‐
te m. The shoulder belt stra p must be
ro uted forw ards and down wards from
th e seat belt outlet. If necessar y,adjust
th e seat belt outlet and the front
passenger seat accordingly. 0007
Alw ays obser vethech ild restra int sys‐
te m manufacturer's ins tallation instruc‐
tions. When
fitting a child restra int sy stem tothe front
passenger seat, obser vetheve hicle-specific
information (0013 page 68).
If a person is sitting on the front passenger
seat: PASSENGER AIR BAG OFF may be lit con‐
tinuously or be off, depending on the person's
st ature. A person on
the front passenger seat must
alw ays obser vethefo llowing information:
R Ifth e front passenger seat is occupied byan
adult or a person with a stature cor respond‐
ing tothat of an adult, thePA SSENGER AIR
BA G OFF indicator lamp must be off. This
indicates that the front passenger front air‐
bag is enabled.
If th ePA SSENGER AIR BAG OFF indicator
lamp is lit continuousl y,an adult or person
with a build cor responding tothat of an adult
should not use the front passenger seat.
Ins tead, they should use a rear seat.
R Ifth e front passenger seat is occupied by a
person of smaller stature (e.g. a teenager or
small adult), thePA SSENGER AIR BAG OFF
indicator lamp either lights up continuously
or remains off, depending on there sult of the
classi fication.
- Ifth ePA SSENGER AIR BAG OFF indicator
lamp is off: mo vethe front passenger
seat as far back as possible, or the per‐
son of smaller stature should use a rear
seat. -
Ifth ePA SSENGER AIR BAG OFF indicator
lamp is lit continuously: the person of
smaller stature should not use the front
passenger seat. 000A
WARNING Risk of inju ryor death when
th ePA SSENGER AIR BAG OFF indicator
lamp is lit
If th ePA SSENGER AIR BAG OFF indicator
lamp remains lit af terth e sy stem self-test,
th e front passenger airbag is disabled. It will
not be deplo yed in theeve nt of an accident.
In this case, the front passenger airbag can‐
not per form its intended pr otective function,
e.g. when a person is seated in the front
passenger seat.
That person could, forex ample, come into
contact with theve hicle interior, especially if
th e person is sitting too close tothe cockpit.
If th e front passenger seat is occupied,
alw ays ensure that:
R The classification of the person in the
front passenger seat is cor rect and the Occupant saf
ety45

front passenger airbag is enabled or disa‐
bled in accordance with the person in the
front passenger seat.
R The person is sea ted properly with a cor‐
re ctly fastened seat belt.
R The front passenger seat has been mo ved
as far back as possible. Be sure
toalso obse rveth efo llowing fur ther
re lated subjects:
R Child restra int sy stem on the front passenger
seat (0013 page 68).
R Suitable positioning of thech ild restra int sys‐
te m (0013 page54). PRE-SAFE
®
sy stem PRE-
SAFE®
(anticipa tory occupant pr otec‐
tion) PRE-
SAFE®
is able todetect cer tain critical driv‐
ing situations and implement pre-em ptive meas‐
ures toprotect theve hicle occupants. PRE-SAFE
®
can implement thefo llowing meas‐
ures independently of each other:
R Tightening the seat belts on the driver's seat
and front passenger seat.
R Closing the side windo ws.
R Vehicles with sliding sunroof: closingthe
sliding sunroof.
R Vehicles with memory function: moving
th e front passenger seat toa more favo ura‐
ble seat position.
R Vehicles with multicontour seat: increas‐
ing the air pressure in the seat side bols ters
of the seat backrest.
R PRE-SAFE ®
Sound: pr ovided that the multi‐
media sy stem is switched on, generates a
brief noise signal tostimulate the innate pro‐
te ctive mechanism of a person's hea ring.
000E NO
TEDama gecaused byobjects in the
fo ot we ll or behind the seat The automatic adjustment of
the seat posi‐
tion may result in damage tothe seat and/or
th e object. 0007
Stow objects in a suitable place. Re
versing the PRE- SAFE®
sy stem measures If an accident did not occur,
the pre-em ptive
measures that we retake n are reve rsed.
Yo u will need toper form certain settings your‐
self. 0007
Ifth e seat belt pre-tensioning is not reduced,
mo vethe seat backrest back slightl y.
The locking mechanism releases. Fu
nction of PRE-SAFE ®
PLUS (anticipatory
occupant pr otection plus) PRE-
SAFE®
PLUS can de tect cer tain impacts,
particular lyan imminent rear impact, and take
pre-em ptive measures toprotect theve hicle
occupants. These measures cannot necessarily
pr eve nt an imminent impact. 46
Occupant sa fety

PRE-SAFE
®
PLUS can implement thefo llowing
measures independently of each other:
R Tightening the seat belts on the driver's seat
and front passenger seat.
R Activating there ar hazard warning lights at a
higher flashing frequenc y.
R Increasing brake pressure when theve hicle
is stationar y.This brake application is cancel‐
led automatically when theve hicle pulls
aw ay.
If an accident did not occur, the pre-em ptive
measures that we retake n are reve rsed.
Sy stem limitations
The sy stem will not initiate any action in thefo l‐
lowing situations:
R when reve rsing
or
R when theve hicle is towing a trailer and there
is a risk of a rear impact The sy
stem will not initiate any braking applica‐
tion in thefo llowing situations:
R whilst driving
or
R when entering or exiting a parking space
while using Active Parking Assist Safely transporting
children in theve hicle Alw
ays obser vewhen children are tr avelling
in theve hicle 0009
Also strictly obser vethe saf ety no tesfo rthe
specific situation. In this wa yyo u can recog‐
nise po tential risks and avoid dangers if chil‐
dren are tr avelling in theve hicle
(0013 page 48).
Be diligent
Bear in mind that neglecting tosecure a child in
th ech ild restra int sy stem may ha veserious con‐
sequences. Alw ays be diligent in securing a child
carefully before every journe y. To
impr ove pr otection forch ildren younger than
12 years old or under 1.50 m in height,
Mercedes-Benz recommends you obse rvethe
fo llowing information:
R Alw ays secure thech ild in a child restra int
sy stem suitable forth is Mercedes-Benz vehi‐
cle.
R The child restra int sy stem must be appropri‐
ate tothe age, weight and size of thech ild.
R The vehicle seat must be suitable forfitting a
ch ild restra int sy stem (0013 page54).
Ac cident statistics show that children secured
on there ar seats are generally sa ferth an chil‐
dren secured on the front seats. Forth is reason,
Mercedes-Benz stronglyadvises that youfit a
ch ild restra int sy stem toare ar seat.
Generic term"child restra int sy stem"
The generic term child restra int sy stem is used
in this Owner's Manual. A child restra int sy stem
is, forex ample:
R a baby car seat
R are ar wa rd-facing child seat Occupant saf
ety47