MERCEDES-BENZ C-CLASS ESTATE 2021 Service Manual

ModiNed or damaged seat belts could tear or
fail in the event of an accident, for example.
ModiNed seat belt tensioners could acciden-
tally trigger or fail to function as intended.Never modify the seat belt system, for
example 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 worn and clean.Always have the seat belts checked immediately aser an accident at a quali-
Ned specialist workshop.
Mercedes-Benz recommends that you use seat
belts which have been approved for your vehicle by Mercedes-Benz.
&WARNING Risk of injury or death from
deployed pyrotechnic seat belt tensioners
Pyrotechnic seat belt tensioners that have
been deployed are no longer operational and
are unable to perform their intended protec-
tive function.
Therefore, have deployed pyrotechnic
seat belt tensioners immediately
replaced at a qualiNed specialist work-
shop.
Mercedes-Benz recommends that you have the
vehicle towed to a qualiNed specialist workshop
aser an accident.
*NOTE Damage caused by trapping 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 ensure that an unused seat belt
is fully retracted.
Fastening and adjusting seat belts
If the seat belt is pulled quickly or sharply, the seat belt retractor locks. The seat belt strap can-
not be pulled out any further.
Always engage seat belt tongue 2 of the seat
belt into seat belt buckle 1 of the corre-
sponding seat.Press and hold the seat belt outlet release and slide seat belt outlet 3 into the desired posi-
tion.Let go of the seat belt outlet release and
ensure that seat belt outlet 3 locks into posi-
tion.Occupant safety39

%A seat belt can only provide the best level of
protection if it is worn correctly. Observe the notes on fastening the seat belt (  page 37).*NOTE Deployment of components of the
restraint 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 the restraint system may deploy unnecessa-
rily on the front passenger side, e.g. the seat
belt tensioner.
Only buckle the seat belts as intended.%Observe the notes on correctly fastening the
seat belt (  page 37) and stowage options
(  page 109).
Information on Ntting a child restraint system
and on children travelling in the vehicle can
be found in the "Children in the vehicle" sec-
tion (  page 55).Seat belt adjustment function
Vehicles with PRE-SAFE n
: aser a front seat belt
has been fastened, the automatic seat belt adjust-
ment may apply a certain tightening force. Do not
hold the seat belt tightly while it is adjusting.
You can activate and deactivate the seat belt
adjustment function using the multimedia system (  page 40).
Activating/deactivating seat belt adjustment via
the multimedia system
Multimedia system:
4 © 5
Settings 5
Vehicle
5 Occupant protection
Activate or deactivate Belt adjustment.
Releasing seat belts
Press the release button in the seat belt
buckle and guide the seat belt back with the
seat belt tongue.Seat belt warning function for the driver and front passenger
The 00E9 seat belt warning lamp in the driver's
display is a reminder that all vehicle occupants must wear their seat belts correctly.
In addition, a warning tone may sound.
As soon as the driver and front passenger fasten
their seat belts, the seat belt warning goes out.
Function of the rear seat belt status display
The rear seat belt status display is only available
for certain countries.
40Occupant safety

When the ignition is switched on, the rear seat
belt status display informs you for a certain
amount of time which rear seat belt is not fas-
tened.
The status of the rear seat belt can be recognised
by the colour of the symbol in the driver display:
= Grey: the seat belt tongue of a rear seat belt is
not engaged in the seat belt buckle of the cor-responding seat.
= Green: the seat belt tongue of a rear seat belt
is engaged in the seat belt buckle of the corre-
sponding seat.
Every vehicle occupant must always fasten their seat belt correctly before starting a jour-
ney.
= Red: a vehicle occupant in the rear passenger
compartment has released the seat belt
buckle using the release button and may not
be properly secured.
If a vehicle occupant unfastens a seat belt in the
rear, the rear seat belt status display appears again.
In addition, a warning tone may sound.Airbags
Overview of airbags
1Knee airbag2Driver's airbag3Front passenger airbag4Window airbag5Side airbag6Centre airbag 1
1)
Only for certain countries.
The installation location of an airbag is identiNed
by the AIRBAG symbol. An additional arrow sym-
bol 0050 indicates the installation location for cer-
tain airbags.
When enabled, an airbag can provide additional protection for the respective vehicle occupant.
Potential protection provided by each airbag:
= Knee airbag: thigh, knee and lower leg
= Driver's airbag, front passenger airbag: head
and ribcage
= Window airbag: head
= Side airbag: ribcage, also pelvis for front seat
occupants
= Centre airbag: head and ribcage
Information on child restraint systems on the front passenger seat&WARNING Risk of injury or death if the co-
driver airbag is enabled
If the co-driver airbag is enabled, a child on
the co-driver seat may be struck by the co-
driver airbag during an accident.
Occupant safety41

NEVER use a rearward-facing child restraint
system on a seat with an ENABLED FRONT AIRBAG; DEATH or SERIOUS INJURY to theCHILD can occur.
When Ntting a child restraint system to the front
passenger seat, observe the vehicle-speciNc infor-
mation (  page 66). Also, always observe the
notes on rearward-facing or forward-facing child
restraint systems on the front passenger seat (  page 65).
Information on automatic front passenger airbag
shutoM
The front passenger airbag can only be deployed
in an accident if the PASSENGER AIR BAG OFF indicator lamp is oM. If the front passenger seat is
occupied, make sure, both before and during the
journey, that the status of the front passenger air-
bag is correct (  page 46).
*NOTE Deployment of components of the
restraint system when the front passenger
seat is unoccupied
In an accident, the components of the restraint system may deploy unnecessarily on
the front passenger side if:
= There are heavy objects on the front
passenger seat.
= The seat belt tongue is engaged in the seat
belt buckle of the front passenger seat and
the 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 detected accident situation, the window airbag on the front passenger side maydeploy. The airbag is deployed regardless of
whether the front passenger seat is occupied.
Protective capacity of the airbags
Depending on the accident situation, an airbag may supplement the protection oMered by a cor-
rectly fastened seat belt.
&WARNING Risk of injury or death due to
an incorrect seat position
If you deviate from the correct seat position,
the airbag cannot perform its intended protec-
tive function.
Each vehicle occupant must make sure of the
following:
= Fasten seat belts correctly. Pregnant
women must take particular care to ensure
that the lap belt never lies across the
abdomen.
= Adopt the correct seat position and keep
as far away as possible from the airbags.
= Observe the following information.
Always make sure that there are no
objects between the airbag and vehicle
occupant.42Occupant safety

To avoid the risks resulting from the deployment
of an airbag, each vehicle occupant must observe
the following information in particular:
= Before starting your journey, adjust your seat
correctly; the driver's seat and front
passenger seat should be moved as far back as possible.
When doing so, always observe the informa-
tion on the correct driver's seat position
(  page 94).
= Only hold the steering wheel by the steering
wheel rim. This allows the airbag to be fully
deployed.
= Always lean against the seat backrest when
the vehicle is in motion. Do not lean forwards
or against the door or side window. You may otherwise be in the deployment area of the
airbags.
= The occupants must always keep their feet on
the Ooor. Do not put your feet on the cockpit,
for example. Your feet may otherwise be in the
deployment area of the airbag.
= If children are travelling in the vehicle, observe
the additional notes (  page 51).=
Always stow and secure objects correctly.
Objects in the vehicle interior may prevent an air-
bag from functioning correctly. Each vehicle occu-
pant must always make sure of the following in
particular:
= There are no people, animals or objects
between the vehicle occupants and an airbag.
= There are no objects between the seat, door
and door pillar (B-pillar).
= There are no hard objects, e.g. coat hangers,
hanging on the grab handles or coat hooks.
= There are no accessory parts, such as mobile
navigation devices, mobile phones or cup
holders, within the deployment area of an air- bag, e.g. on the cockpit, on the door, on the
side window or on the side trim.
In addition, no connecting cables, tensioningstraps or retaining straps must be routed or
attached to the vehicle within the deployment
area of an airbag. Always comply with the
accessory manufacturer's installation instruc- tions and, in particular, the notes on suitable
places for installation.= There are no heavy, sharp-edged or fragile
objects in the pockets of your clothing. Store
such objects in a suitable place.
Limited protection provided by airbags
&WARNING Risk of injury due to modiNca-
tions to the cover of an airbag
If you modify the cover of an airbag or aPx
objects such as stickers to it, the airbag may no longer function correctly.
Never modify the cover of an airbag and
do not aPx objects to it.
The installation location of an airbag is identiNed
by the AIRBAG symbol (  page 41).
&WARNING Risk of injury or death due to
the use of unsuitable seat covers
Due to unsuitable seat covers, the airbags
cannot protect vehicle occupants as intended.
Occupant safety43

In addition, the operation of the automatic
front passenger airbag shutoM could be
restricted.You should only use seat covers that
have been approved for the correspond-
ing seats by Mercedes-Benz.&WARNING Risk of injury due to malfunc-
tioning sensors in the door
The function of the airbags can be impaired
due to modiNcations or incorrect work per-
formed on the doors or door trim, or if the
doors are damaged.
Never modify the doors or parts of the
doors.Always have work on the doors or door
trim carried out at a qualiNed specialist
workshop.&WARNING Risk of injury due to deployed
airbag
A deployed airbag no longer oMers any protec-
tion.
Have the vehicle towed to a qualiNed
specialist workshop in order to have the
deployed airbag replaced.Have deployed airbags replaced immediately.
Status of the front passenger front airbag

q Function of the automatic front passenger air-
bag shutoM
The automatic front passenger airbag shutoM is
able to detect whether the front passenger seat is
occupied by a person or a child restraint system. The front passenger airbag is enabled or disabledaccordingly.
&WARNING Risk of injury or death due to
objects under the co-driver seat
Objects trapped under the co-driver seat can
interfere with the function of the automatic
co-driver airbag shutoM 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 Ntting a child restraint system to the front
passenger seat, observe the vehicle-speciNc infor-
mation (  page 66). Also, always observe the
notes on rearward-facing or forward-facing child
restraint systems on the front passenger seat
(  page 65).
&WARNING Risk of injury or death due to
objects between the seat surface and the
child restraint system
Objects between the sitting surface and the child restraint system could aMect the function
of the automatic co-driver airbag shutoM.
Do not place any objects between the
sitting surface and the child restraint system.Make sure that the entire base of thechild restraint system is resting on the
sitting surface of the co-driver seat.44Occupant safety

Make sure that the backrest of theforward-facing child restraint system is,
as far as possible, resting on the seat
backrest of the co-driver seat.Always comply with the child restraint
system manufacturer's installation
instructions.
A person on the front passenger seat must observe the following information:
= Fasten seat belts correctly (  page 37).
= Sit in an almost upright seat position with their
back against the seat backrest.
= Sit with their feet resting on the Ooor, if possi-
ble.
The front passenger airbag may otherwise be dis- abled by mistake, for example, in the following sit- uations:
= The front passenger transfers their weight by
supporting themselves on a vehicle armrest.
= The front passenger sits in such a way that
their weight is raised from the sitting surface.
&WARNING Risk of injury or death due to a
disabled front passenger airbag
The front passenger airbag is disabled when
the PASSENGER AIR BAG OFF indicator lamp
is lit.
A person in the front passenger seat could then, for example, come into contact with the
vehicle interior, especially if the person is sit-
ting too close to the cockpit.
If the front passenger seat is occupied, always ensure that:
= the classiNcation of the person in the front
passenger seat is correct and the front passenger airbag is enabled or disabled in
accordance with the person in the front
passenger seat.
= the front passenger seat has been moved
as far back as possible.
= the person is seated correctly.
Both before and during the journey,
ensure that the status of the front
passenger airbag is correct.If the front passenger seat is occupied, the classi-
Ncation of the person or child restraint system on
the front passenger seat takes place aser the
front passenger airbag shutoM self-test. The
PASSENGER AIR BAG indicator lamps display the status of the front passenger airbag.
Always observe the notes on the function of the PASSENGER AIR BAG indicator lamps
(  page 46).Occupant safety45

qFunction of the PASSENGER AIR BAG indicator
lamps
Vehicles without automatic front passenger airbag
shutoM have a special sticker aPxed to the side of
the cockpit on the front passenger side
(  page 65).
Self-test of automatic front passenger airbag shut-
oM When the ignition is switched on, a self-test is per-formed during which the two PASSENGER AIRBAG ON and OFF indicator lamps light up simulta-
neously.
The status of the front passenger airbag is dis- played via the PASSENGER AIR BAG indicatorlamps aser the self-test:
= ON is lit: the front passenger airbag may
deploy during an accident.
The indicator lamp goes out aser 60 seconds.
= ON and OFF are not lit: the front passenger
airbag may deploy during an accident.
= OFF is lit: the front passenger airbag is disa-
bled. It will then not be deployed in the event
of an accident.
If the PASSENGER AIR BAG ON indicator lamp is
oM, only the PASSENGER AIR BAG OFF indicator
lamp shows the status of the front passenger air-
bag. The PASSENGER AIR BAG OFF indicator lamp
may be lit continuously or be oM.If the PASSENGER AIR BAG OFF indicator lamp
and the 0075 restraint system warning lamp light
up simultaneously, the front passenger seat may not be used. Also in this case, do not Nt a child
restraint system to the front passenger seat. Have
the automatic front passenger airbag shutoM
checked and repaired immediately at a qualiNed
specialist workshop.
Status display
If the front passenger seat is occupied, ensure,
both before and during the journey, that the sta- tus of the front passenger airbag is correct for the
current situation.
Aser Ntting a rearward-facing child restraint sys-
tem to the front passenger seat: PASSENGER AIR
BAG OFF must be lit continuously.&WARNING Risk of injury or death when
using a rearward-facing child restraint sys- tem while the front passenger airbag is
enabled
If you secure a child in a rearward-facing child
restraint system on the front passenger seat
and the PASSENGER AIR BAG OFF indicator
46Occupant safety

lamp is oM, the front passenger airbag can
deploy in the event of an accident.
The child could be struck by the airbag.Always ensure that the front passenger
airbag is disabled. The PASSENGER AIR
BAG OFF indicator lamp must be lit.NEVER use a rearward-facing child restraint system on a seat with an ENA-
BLED FRONT AIRBAG. This can result in
the DEATH of or SERIOUS INJURY to the CHILD.
When Ntting a child restraint system to the front
passenger seat, observe the vehicle-speciNc infor-
mation (  page 65).
Depending on the child restraint system and the stature of the child, the PASSENGER AIR BAG OFF
indicator lamp may be oM. In this case, do not Nt
the rearward-facing child restraint system to the front passenger seat.
Instead, Nt the rearward-facing child restraint sys-
tem to a suitable rear seat.
Aser Ntting a forward-facing child restraint sys-
tem to the front passenger seat: depending on the
child restraint system and the stature of the child,
PASSENGER AIR BAG OFF may be lit continuously
or be oM. Always observe the following informa-
tion.&WARNING Risk of injury or death due to
incorrect positioning of the forward-facing
child restraint system
If you secure a child in a forward-facing child
restraint system on the front passenger seat
that is positioned too close to the cockpit, in
the event of an accident, the child could:
= come into contact with the vehicle interior
if the PASSENGER AIR BAG OFF indicator
lamp is lit, for example
= be struck by the airbag if the PASSENGER
AIR BAG OFF indicator lamp is oM.
Always move the front passenger seat as
far back as possible and fully retract the
seat cushion length adjustment. While
doing so, always make sure that the
shoulder belt strap is correctly routed
from the seat belt outlet of the vehicle to
the shoulder belt guide on the childrestraint system. The shoulder belt strap must be routed forwards and downwards
from the seat belt outlet. If necessary, adjust the seat belt outlet and the front
passenger seat accordingly.Always comply with the child restraint
system manufacturer's installation
instructions.
When Ntting a child restraint system to the front
passenger seat, observe the vehicle-speciNc infor-
mation (  page 65).
If a person is sitting on the front passenger seat:
PASSENGER AIR BAG OFF may be lit continuously
or be oM, depending on the person's stature.
A person on the front passenger seat must always observe the following information:
= If the front passenger seat is occupied by an
adult or a person with a stature corresponding
to that of an adult, the PASSENGER AIR BAG
OFF indicator lamp must be oM. This indicates
that the front passenger airbag is enabled.
If the PASSENGER AIR BAG OFF indicator
lamp is lit continuously, an adult or person
Occupant safety47

with a build corresponding to that of an adult
must not use the front passenger seat.
Instead, they should use a rear seat.
= If the front passenger seat is occupied by a
person of smaller stature (e.g. a teenager or
small adult), the PASSENGER AIR BAG OFF indicator lamp is either lit continuously or
remains oM, depending on the classiNcation.
- If the PASSENGER AIR BAG OFF indicator
lamp is oM move the front passenger seat
as far back as possible, or the person of smaller stature should use a rear seat.
- If the PASSENGER AIR BAG OFF indicator
lamp is lit continuously: the person of
smaller stature should not use the front
passenger seat.&WARNING Risk of injury or death when
the PASSENGER AIR BAG OFF indicator
lamp is lit
If the PASSENGER AIR BAG OFF indicator lamp remains lit aser the self-test, the front
passenger airbag is disabled.
If the front passenger seat is occupied, always
ensure that:
= The classiNcation of the person in the front
passenger seat is correct and the front
passenger airbag is enabled or disabled in
accordance with the person in the front
passenger seat.
= The person is seated properly with a cor-
rectly fastened seat belt.
= The front passenger seat has been moved
as far back as possible.
Be sure to also observe the following further rela-
ted subjects:
= Child restraint system on the front passenger
seat (  page 65)
= Suitable positioning of the child restraint sys-
tem (  page 55)
PRE-SAFE n
system
PRE-SAFE n
(anticipatory occupant protection)
PRE-SAFE n
is able to detect certain critical driv-
ing situations and implement pre-emptive meas-
ures to protect the vehicle occupants.
PRE-SAFE n
can implement the following meas-
ures independently of each other:
= Tightening the seat belts on the driver's seat
and front passenger seat.
= Closing the side windows.
= Vehicles with sliding sunroof: close the sliding
sunroof.
= Vehicles with memory function: move the front
passenger seat to a more favourable seat
position.
= Vehicles with multicontour seat: increase the
air pressure in the seat side bolsters of the seat backrest.
= PRE-SAFE n
Sound: provided that the multime-
dia system is switched on, generates a brief
noise signal to stimulate the innate protective
mechanism of a person's hearing.
48Occupant safety