MERCEDES-BENZ S-CLASS SALOON LONG 2021 Workshop Manual

In addition, an incor
rectly fastened seat belt
can also cause injuries, forex ample, in the
eve nt of an accident or when braking or
ch anging direction suddenl y.#
Always ensu rethat all vehicle occupants
ha ve their seat belts fastened co rrectly
and are sitting proper ly.Alw
ays obser vethe inst ructions about the cor rect
driver's seat position and adjusting the seat
(/ page 118).
In order forth e cor rectly wornseat belt toprov ide
th e intended le vel of pr otection, each vehicle
occupant must obser vethefo llowing information:
R The seat belt must not be twisted and must /t
tightly and snugly across the body.
R The seat belt must be routed across the
cent reofthe shoulder and as low down across
th e hips as possible.
R The shoulder section of the seat belt should
not touch your neck nor be routed under your
arm or behind your bac k.
R Avoid wearing bulky clo thing, e.g. a winter
coat. R
Push the lap belt down as far as possible
across your hips and pull tight with the shoul-
der section of the belt. Neverro ute the lap
belt across your abdomen.
Pregnant women must also take particular
care with this.
R Neverro ute the seat belt across sharp, poin-
te d, abrasive or fragile objects.
R Only one person should use each seat belt at
any one time.
R Never secure objects with a seat belt if the
seat belt is also being used byone of theve hi-
cle's occupants.
Also ensu rethat no objects, e.g. a cushion,
are ever placed between a person and the
seat.
If ch ildren are tr avelling in theve hicle, be sure to
obser vethe inst ructions and saf ety no tes on
"Child ren in theve hicle" (/ page 66).
Alw ays obser vethe inst ructions for loading the
ve hicle when securing objects, lug gage or loads
(/ page 148). Limit Limit
ations of t
ations of t he prot
he pr otection pro
ection pro vided b
vided by t
y the seat
he seat
belt
belt &
W
WARNING
ARNING Risk of injury or death due to
incor rect seat position
The seat belt will not o.er the intended le vel
of pr otection if you ha venot mo vedth e seat
backrest toan almost vertical position.
In particular, you may slip under the seatbelt
and injure yourself. #
Adjust the seat proper lybefore begin-
ning your journe y. #
Always ensu rethat the seat backrest is
in an almost vertical position and that
th e shoulder section of your seat belt is
ro uted across the centre of your shoul-
der. 48
48
Occupant saf
ety

&
W
WARNI NG
ARNI NGRisk of injury or dea thwhen
additional restraint systems are not used
fo r persons with a smaller stature
Pe rsons under 1.50 m tall cannot wearthe
seat belt cor rectly without a suitable addi-
tional restraint system. #
Always secure persons under 1.50 m tall
in a suitable restraint system. &
W
WARNING
ARNING Risk of injur y or death due to
bloc ked seat belt buckle or seat belt
anchorage
Objects next tothe front seat that block the
seat belt buckle or the moving seat belt
anchorage on the front seat impair the func-
tion of the seat belt tensioners. #
Before starting the journe y,make sure
th at there are no objects around the seat
belt buckle or between the front seat
and door. &
W
WARNING
ARNING Risk of injury or death due to
damaged or modi/ed seat belts
Seat belts cannot pr ovide pr otection in thefo l-
lowing situations:
R the seat belt is damaged, has been modi-
/ed, is extremely dirty, blea ched or dyed
R the seat belt buckle is damaged or
ex tremely dirty
R modi/cations ha vebeen made tothe seat
belt tensioner, seat belt anchorage or seat
belt retractor
Seat belts may sustain non-visible damage in
an accident, e.g. due toglass splinters.
Modi/ed or damaged seat belts could tear or
fa il in theev ent of an accident, forex ample.
Modi/ed seat belt tensioners could acciden-
ta lly trigger or failto function as intended. #
Never modify the seat belt system, for
ex ample the seat belt, seat belt buckle,
seat belt tensioner, seat belt anchorage
and seat belt retractor. #
Make sure that the seat belts are undam-
aged, not wornand clean. #
Always ha vethe seat belts checked
immediately aTer an accident at a quali-
/ed specialist workshop. Mercedes-Benz
recommends that you use seat
belts which ha vebeen appr ovedfo ryo ur vehicle
by Mercedes-Benz. &
W WARNI NG
ARNI NGRisk of injury or dea thfrom
deplo yedpy rotech nic seat belt tensioners
Pyro tech nic seat belt tensioners that ha ve
been deplo yed are no longer operational and
are unable toper form their intended pr otec-
tive function. #
Therefore, ha vedeplo yedpy rotech nic
seat belt tensioners immedia tely
re placed at a quali/ed specialist work-
shop. Mercedes-Benz
recommends that you ha vethe
ve hicle towe dto aqu ali/ed specialist workshop
aTer an accident. Occupant saf
ety
49
49

*
N
NO
OTE
TE Damage caused bytrapping the
seat belt If an unused seat belt is not fully
retracted, it
may become trapped in the door or in the seat
mechanism. #
Always ensu rethat an unused seat belt
is fully retracted. Inf
Inf
or
ormation on t
mation on t he belt airbag in t
he belt airbag in t he r
he rear seat belt
ear seat belt The BELTB
AGidenti/cation indicates that a rear
seat belt is equipped with a belt airbag.
When activated, the belt airbag increases the pro-
te cted area of theve hicle occupant's ribcage. &
W WARNING
ARNING Risk of injury or death dueto
use of a non-appr ovedch ild restraint sys-
tem
In an accident, the belt airbag may damage a
non-appr oved child restraint system or a child
re straint system which has not been appro ved
fo r use in conjunction with the belt airbag. Fo
r saf etyre asons, Mercedes-Benz recom-
mends that you only use a child restraint sys-
te m which has been tested and appro vedby
Mercedes-Benz in combination with a belt air-
bag. Information on
child restraint systems
(/ page 69). Ext Ext
ending/re
ending/re tr
tracting t
acting t he seat belt e
he seat belt e xt
xtender in t
ender in t he
he
r
r ear
ear The seat belt
extender forth ere ar seat helps you
fa sten your seat belt. #
Close the door.
The seat belt extender extends.
% Ifth eve hicle is equipped with the MBUX Inte-
ri or Assistant, the seat belt extender extends
when youre ach forth e seat belt tongue.
The seat belt extender retracts again in thefo llo w-
ing cases:
R the seat belt tongue is engaged in the seat
belt buckle R
the seat belt tongue is not engaged in the seat
belt buckle within a cer tain time
R there specti vedoor is opened
R a cer tain speed is exceeded aTer pulling away &
W
WARNI NG
ARNI NGRisk of injury or dea thdue to
an extended seat belt extender while the
ve hicle is in motion
If th e seat belt does not sit cor rectly on the
body, it cannot per form its intended pr otective
function. #
Always ensu rethat the seat belt
ex tender is retracted while theve hicle is
in motion. If
th e seat belt extender does not retract automat-
icall y,it can be retracted manuall y.To do so,
press the seat belt extender back as far as it will
go before starting theve hicle. Pressing the seat
belt extender back into place requ ires forc e.
% You can deactivate the seat belt extender.
Ac tivate thech ild saf ety lock forth ere ar side
wind ows (/ page 86). 50
50
Occupant saf
ety

When /tting a
child restraint system tothe
re ar seat, obser vetheve hicle-speci/c infor-
mation (/ page 70). F
F
ast
ast ening and adjus
ening and adjusting seat belts ting seat belts If
th e seat belt is pulled quickly or sharpl y,the
seat belt retractor loc ks. The seat belt strap can-
not be pulled out any fur ther.
V
V ehicles wit
ehicles wit h illuminat
h illuminated design seat belt buc
ed design seat belt buc kles:
kles:
th e illuminated seat belt buckle makes fastening
yo ur seat belt easier in cer tain situations, for
ex ample, when light conditions are poor.
% The illumination on the seat belt buckle does
not indicate that the seat belt buckle is func-
tioning cor rectl y. #
Always engage seat belt tongue 2ofthe seat
belt into seat belt buckle 1ofthe cor re-
sponding seat. #
T
To adjus
o adjust t t the seat belt height
he seat belt height: :press and hold
th e belt guide release and slide seat belt out-
let 3 into the desired position. #
T
To eng
o eng ag
age t
e t he seat belt outlet
he seat belt outlet: :let go of the
belt guide release and ensure that seat belt
outlet 3locksinto position. %
A seat belt can only pr ovide the best le vel of
pr otection if it is worncor rectl y.Obser vethe
no tes on fastening the seat belt (/ page 47).
* N
NOOTE
TE Deployment of components of the
re straint system when the front passenger
seat is unoccupied and a seat belt is
buckled When
the front passenger seat is unoccupied
and the seat belt tongue of the seat belt is
engaged in the seat belt buckle, components
of there straint system ma y deployunnecessa-
ri ly on the front passenger side, e.g. the seat
belt tensioner. #
Only buckle the seat belts as intended. %
Obser vethe no tes on st owage areas
(/ page 148).
Information on /tting a child restraint system
and on children tr avelling in theve hicle can
be found in the "Children in theve hicle" sec-
tion (/ page 70). Occupant saf
ety
51 51

Seat belt adjus
Seat belt adjustment function
tment functionV
V
ehicles wit
ehicles wit h PRE-S
h PRE-SAFE
AFE®
®
:
:aTer a front seat belt
has been fastened, the automatic seat belt adjust-
ment may apply a cer tain tightening 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 system
(/ page 52). A
A
ctiv
ctiv ating/deactiv
ating/deactiv ating seat belt adjus
ating seat belt adjustment via tment via
t
t he multimedia syst
he multimedia syst em
emMultimedia system:
4 © 5
Settings 5
Vehicle
5 Occupant protection #
Activate or deactivate Belt adjustment.R
R
eleasing seat belts
eleasing seat belts #
Press there lease button in the seat belt
buckle and guide the seat belt back with the
seat belt tongue. Seat belt w
Seat belt w
ar
arning function f
ning function f or t
or the dr
he dr iv
iver and fr
er and fr ont
ont
passeng
passeng er
er The
ü seat belt warning lamp in the driver's
display is a reminder that all vehicle occupants
must weartheir seat belts cor rectl y.
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. F
F
unction of t
unction of t he r
he rear seat belt st
ear seat belt st atus display
atus display The
rear seat belt status display is onlyavailable
fo r cer tain countries. When
theve hicle is switched on, there ar seat
belt status displ ayinforms youfo r a cer tain
amount of time which rear seat belt is not fas-
te ned.
The status of there ar seat belt can be recognised
by the colour of the symbol in the driver's displa y:
R Grey:th e seat belt tongue of a rear seat belt is
not engaged in the seat belt buckle of the cor-
re sponding seat.
R Green: the seat belt tongue of a rear seat belt
is engaged in the seat belt buckle of the cor re-
sponding seat.
Every vehicle occupant must alw aysfa sten
th eir seat belt cor rectly before starting a jou r-
ne y.
R Red: a vehicle occupant in there ar passen ger
compartment has released the seat belt
buckle using there lease button and may not
be proper lysecured.
If a vehicle occupant unfastens a seat belt in the
re ar, there ar seat belt status displ ayappears
again.
In addition, a warning tone may sound. 52 52
Occupant safe
ty

Airbags
Airbags
Ov
Ov
er
ervie
vie w of airbags
w of airbags Driver's/front passenger sea
t:
1 Knee airbag
2 Driver's airbag
3 Front passenger airbag
4 Window airbag
5 Side airbag
6 Centre airbag 1
1) Only for cer tain countries. Re
ar seats:
4 Window airbag
7 Side airbag
8 Rear airbag
The ins tallation location of an airbag is identi/ed
by the AIRB AGsymbol. An additional ar row sym-
bol Mindicates the installation location for cer-
ta in airbags.
When enabled, an airbag can pr ovide additional
pr otection forth ere specti ve vehicle occupant.
Po tential pr otection pr ovided byeach airbag:
R Knee airbag: thigh, knee and lo wer leg R
Driver's airbag, front passenger airbag: head
and ribcage
R Window airbag: head
R Side airbag: ribcage, also pelvis for front seat
occupants
R Centre airbag: head and ribcage
R Rear airbag: head
Inf Inf or
ormation on c
mation on c hild r
hild res
estr
traint syst
aint syst ems on t
ems on t he fr
he front
ont
passeng
passeng er seat
er seat &
W
WARNING
ARNING Risk of injury or death if the co-
driver airbag is enabled
If th e co-driver airbag is enabled, a child on
th e co-driver seat may be struck bythe co-
driver airbag during an accident.
NEVER use a rear wa rd-facing child restraint
system on a seat wi than ENABLED FRONT
AIR BAG; DEATH or SERIOUS INJURY tothe
CHILD ca n occur. When /tting a
child restraint system tothe front
passenger seat, obser vetheve hicle-speci/c infor-
mation (/ page 83). Also, alw ays obser vethe Occupant saf
ety
53 53

no
tes on rear wa rd-facing or forw ard-facing child
re straint systems on the front passenger seat
(/ page 82).
Inf
Inf or
ormation on aut
mation on aut omatic fr
omatic front passeng
ont passeng er airbag
er airbag
shut
shut o.
o.
The front passenger airbag can only be deplo yed
in an accident if thePA SSENGER AIR BAG OFF
indicator la mpis o.. If the front passenger seat is
occupied, make sure, bo thbefore and during the
journe y,that the status of the front passenger air-
bag is cor rect (/ page 58).
* NO
NOTE
TEDeployment of components of the
re straint system when the front passenger
seat is unoccupied In an accident,
the components of the
re straint system ma y deployunnecessarily on
th e 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
th e front passenger seat is unoccupied. #
Stow objects in a suitable place. #
Only one person should use each seat
belt at any one time. Depending on
the de tected accident situation, the
wind owairbag on the front passenger side may
deplo y.The airbag is deplo yedre ga rdless of
whe ther the front passenger seat is occupied.
Inf Inf or
ormation on t
mation on t he centr
he centre airbag
e airbag
When triggered, the centre airbag deplo ys
between the front seats. Do not st owany objects
in the deployment area of the centre airbag.
Inf
Inf or
ormation on t
mation on t he r
he rear airbag
ear airbag
Alw ays obser vethe information on there ar air-
bag, especially in thefo llowing situations:
R A person is sitting on the outer rear seat.
R You install a child restraint system on the
outer rear seat.
R You st owobjects behind the front seats.
Before beginning the journe y,obser vethe infor-
mation on there ar airbag (/ page 61). Be
awa reofthe status of there specti verear airbag depending on
the situation bo thbefore and during
th e journey (/ page 62).
Inf
Inf or
ormation on t
mation on t he cushionbag in t
he cushionbag in t he r
he reclining
eclining
r
r ear seat
ear seat
The cushionbag o.ers additional occupant pr otec-
tion in theev ent of frontal impacts. When ena-
bled, the cushionbag deplo ysunder the seat cush-
ion. This helps pr event theve hicle occupant from
slipping o. the seat cushion.
If yo u install a child restraint system on there clin-
ing rear seat, alw ays obser vethe additional no tes
( / page 70). Pr
ot
Pr otection pro
ection pro vided b
vided by t
y the airbags
he airbags Depending on
the accident situation, an airbag
may supplement the pr otection o.ered bya cor-
re ctly fastened seat belt. &
W
WARNING
ARNING Risk of injur y or death due to
an inco rrect seat position
If yo u deviate from the cor rect seat position,
th e airbag cannot per form its intended pr otec-
tive function. 54
54
Occupant saf
ety

Each
vehicle occupant must make sure of the
fo llowing:
R Fasten seat belts co rrectl y.Pregnant
wo men must take particular care toensure
th at the lap belt ne ver lies across the
abdomen.
R Adopt the cor rect seat position and keep
as farawa y as possible from the airbags.
R Obser vethefo llowing information. #
Always 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 ve
th efo llowing information in particular:
R Before starting your journe y,adjust your seat
cor rectl y;the 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
(/ page 118). V V
ehicles wit
ehicles wit h r
h rear airbag:
ear airbag: always obser vethe
information on there ar airbag when there ar
seat is occupied (/ page 61). Thevehicle
occupants should sit as far back from the air-
bags as possible and keep an equal distance
to them.
R Only hold the steering wheel bythe steering
wheel rim. This allo ws the airbag tobe fully
deplo yed.
R Always 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 The occupants must alw ayske ep their feet on
th e 0oor. Do not put your feet on the cockpit,
fo rex ample. Your feet may otherwise be in the
deployment area of the airbag.
V
V ehicles wit
ehicles wit h r
h rear airbag:
ear airbag: always obser vethe
information on there ar airbag when there ar
seat is occupied (/ page 61).
R Ifch ildren are tr avelling in theve hicle, obser ve
th e additional no tes (/ page 66).
R Always st owand secure objects cor rectl y. Objects in
theve hicle interior may pr event an air-
bag from functioning cor rectl y.Each vehicle occu-
pant must alw ays make sure of thefo llowing in
particular:
R There are no people, animals or objects
between theve hicle occupants and an airbag.
V V ehicles wit
ehicles wit h r
h rear airbag:
ear airbag: also observethe
information on there ar airbag (/ page 61).
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 thegr ab handles or coat hooks.
R There are no accessories, such as mobile navi-
gation devices, mobile phones or cup holders,
within the deployment area of an airbag, e.g.
on the cockpit, on the door, on the side win-
dow or on the side trim.
In addition, no connecting cables, tensioning
straps or retaining straps must be routed or
attached totheve hicle within the deployment
area of an airbag. Alw ays comply with the
accessory manu facturer's ins tallation inst ruc-
tions and, in particular, the no tes on suitable
places for installation. Occupant saf
ety
55 55

R
There are no heavy, sharp-edge d or fragile
objects in the poc kets of your clo thing. Store
such objects in a suitable place. Limit
Limit
ations of t
ations of t he prot
he pr otection pro
ection pro vided b
vided by airbags
y airbags &
W
WARNING
ARNING Risk of injury due tomodi/ca-
tions tothe co ver of an airbag
If yo u modify the co ver of an airbag or a1x
objects such as stic kers to it,the airbag may
no longer function cor rectl y. #
Never modify the co ver of an airbag and
do not a1x objects toit. The installation location of an airbag is identi/ed
by
the AIRB AGsymbol (/ page 53).
Objects in the deployment area of an airbag may
pr ev ent the airbag from functioning cor rectl y. &
W WARNI NG
ARNI NGRisk of injury from objects in
th e deployment area of an airbag
Objects in the deployment area of an airbag
can hinder or pr eventthe cor rect deployment
of the airbag.
The airbag may then deploy in an uncontrolled
manner and may even cause additional inju-
ri es totheve hicle occupants bydeploying.
This may be the case in particular if the airbag
is integ rated into the seat. #
Always st owand secure objects cor-
re ctl y. #
Before commencing your journe y,make
sure that no objects are st owed in the
deployment area of an airbag. Obser
vethe no tes on loading theve hicle
(/ page 148). When triggered, the centre airbag
deplo ysbetween the front seats (/ page 53). &
W
WARNING
ARNING Risk of injury or death due to
th e use of unsuitable seat co vers
Due tounsuitable seat co vers,th e airbags
cannot pr otect vehicle occupants as intended.
In addition, the operation of the automatic
front passenger airbag shuto. could be
re stric ted. #
You should only use seat co vers that
ha ve been appr oved forth e cor respond-
ing seats byMercedes-Benz. &
W WARNI NG
ARNI NGRisk of injury due tomalfunc-
tioning sensors in the door
The function of the airbags can be impaired
due tomodi/cations or incor rect wo rkper-
fo rm ed on the doors or door trim, or if the
doors are damaged. #
Never modify the doors or parts of the
doors. #
Always ha veworkon the doors or door
trim car ried out at a quali/ed specialist
wo rkshop. 56
56
Occupant saf
ety

&
W
WARNI NG
ARNI NGRisk of injury due todeplo yed
airbag
A depl oyed airbag no longer o.ers any pr otec-
tion. #
Have theve hicle towe dto a quali/ed
specialist workshop in order tohave the
deplo yed airbag replaced. Ha
ve deplo yed airbags replaced immediatel y. S
S
t
tatus of t
atus of t he fr
he front passeng
ont passeng er fr
er front airbag
ont airbag F
F
unction of t
unction of t he aut
he automatic fr
omatic fr ont passeng
ont passeng er airbag
er airbag
shut
shut o.
o.
The automatic front passen ger airbag shuto. is
able todetect whe ther the front passenger seat is
occupied bya person or a child restraint system.
The front passenger airbag is enabled or disabled
acco rdingl y. &
W WARNI NG
ARNI NGRisk of injury or dea thdue to
objects under the co-driver seat
Objects trapped under the co-driver seat can
inter fere with the function of the automatic
co-driver airbag shuto. or damage the system. #
Do not store any objects under the co-
driver seat. #
When the co-driver seat is occupied,
make sure that no objects are trapped
under the co-driver seat. When /tting a
child restraint system tothe front
passenger seat, obser vetheve hicle-speci/c infor-
mation (/ page 83). Also, alw ays obser vethe
no tes on rear wa rd-facing or forw ard-facing child
re straint systems on the front passenger seat
(/ page 82).
A person on the front passenger seat must
obser vethefo llowing information:
R Fasten seat belts co rrectly (/ page 47).
R Sit in an almost upright seat position with their
back against the seat backrest. R
Sit with their feet resting on the 0oor, if possi-
ble.
The front passenger airbag may otherwise be dis-
abled bymistake, forex ample, in thefo llowing sit-
uations:
R The front passenger transfers their weight by
supporting themsel ves on a vehicle armrest.
R The front passen ger sits in such a wayth at
th eir weight is raised from the seat sur face. &
W
WARNING
ARNING Risk of injury or death due to a
disabled front passenger airbag
The front passenger airbag is disabled when
th ePA SSENGER AIR BAG OFF indicator lamp
is lit.
A person in the front passenger seat could
th en, forex ample, come into contact with the
ve hicle interior, especially if the person is sit-
ting too close tothe cockpit. Occupant saf
ety
57 57