Get Occupant safety -> Purpose and function of the restraint system Guide for Mercedes C Class 4 Door 2023

Occupant safety – Purpose and function of the restraint system

110

Depending on the detected deployment situation,

Information on how the restraint system works

Purpose and function of the restraint system

Overview of deployment situations (restraint sys-

tem)

the components of the restraint system can be

activated or deployed independently of each

other:

How the restraint system functions depends on

the severity of the impact detected and the appa-

rent type of accident.

For more information about types of accidents,

see "Overview of deployment situations"

(/ page 110).

Make sure that the following prerequisites in par-

ticular have been met so that the components of

the restraint system are able to provide the inten-

ded level of protection:

Seat belt tensioner: frontal impact, rear

impact, side impact, rollover

Driver's airbag, front passenger airbag: frontal

impact

The activation thresholds for the components of

the restraint system are determined based on the

evaluation of the sensor values measured at vari-

ous points in the vehicle. This process is pre-emp-

tive in nature. The triggering/deployment of the

components of the restraint system must take

place in good time at the start of the collision.

Factors which can only be seen and measured

aꢀer a collision has occurred cannot play a deci-

sive role in airbag deployment. Nor do they pro-

vide an indication of airbag deployment.

The vehicle may be deformed signiﬁcantly without

an airbag being deployed. This is the case if only

parts which are relatively easily deformed are

aﬀected and the rate of vehicle deceleration is

not high. Conversely, an airbag may be deployed

even though the vehicle suﬀers only minor defor-

Sit correctly (/ page 100).

Knee airbag: frontal impact

Fasten the seat belt correctly (/ page 101).

Side airbag: side impact

Function of the seat belt warning lamp

(/ page 103).

Centre airbag in the driver's seat backrest:

side impact

Function of the rear seat belt status dis-

play (/ page 103).

Window airbag: side impact, rollover, frontal

impact

The 6 restraint system warning lamp is not

PRE-SAFE^®Impulse Side: side impact

lit up aꢀer the self-test (/ page 102).

The installation location of an airbag is identiﬁed

by the AIRBAG symbol (/ page 116).

The PASSENGER AIR BAG indicator lamps dis-

play the correct status of the front passenger

airbag (/ page 104).

Observe the information on the function of the

restraint system (/ page 110).

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Occupant safety – Purpose and function of the restraint system

111

mation. If very rigid vehicle parts such as longitu-

dinal members are hit, this may result in suﬃ-

ciently high levels of vehicle deceleration.

Depending on the apparent type of accident and

the detected deployment situation, seat belt ten-

sioners and/or airbags supplement the protection larly if a seat belt tensioner is triggered or an air-

oﬀered by a correctly worn seat belt.

When enabled, an airbag can provide additional

protection for the respective vehicle occupant.

Potential protection provided by each airbag:

not possible to completely rule out the risk of

injury caused by the airbag deploying.

Mercedes-Benz recommends that you have the

vehicle towed to a qualiﬁed specialist workshop

aꢀer an accident. Take this into account, particu-

Information on the limited protection provided by

the restraint system

Risk due to the incorrect behaviour of vehicle

occupants

Every vehicle occupant must make sure of the fol-

lowing in particular:

bag deployed.

They observe the information on the correct

seat position (/ page 100).

If the seat belt tensioners are triggered or an air-

bag is deployed, you will hear a bang, and a small

amount of powder may also be released:

There are no heavy, sharp-edged or fragile

objects in the pockets of their clothing. Store

such objects in a suitable place.

The bang will not generally aﬀect your hearing.

Knee airbag: thigh, knee and lower leg

In general, the powder released is not hazard-

Driver's airbag, front passenger airbag: head

and ribcage

ous to health but may cause short-term

breathing diﬃculties to persons suﬀering from

asthma or other pulmonary conditions.

WARNING Risk of injury or death due to

incorrect seat position

Window airbag: head

The seat belt will not oﬀer the intended level

of protection if you have not moved the seat

backrest to an almost vertical position.

In particular, you may slip under the seatbelt

and injure yourself.

Side airbag: ribcage, also pelvis for front seat

occupants

Provided it is safe to do so, leave the vehicle

immediately or open the window in order to

prevent breathing diﬃculties.

Centre airbag: head and ribcage

However, no system available today can com-

pletely eliminate injuries and fatalities in every

accident situation. In particular, the seat belt and

airbag generally do not protect against objects

penetrating the vehicle from the outside. It is also

Adjust the seat properly before begin-

ning your journey.

Always ensure that the seat backrest is

in an almost vertical position and that

F206 0105 02

Occupant safety – Purpose and function of the restraint system

112

The installation location of an airbag is identiﬁed

by the AIRBAG (/ page 116) symbol.

the shoulder section of your seat belt is

routed across the centre of your shoul-

der.

anchorage on the front seat impair the func-

tion of the seat belt tensioners.

Observe the following information:

Before starting the journey, make sure

that there are no objects around the seat

belt buckle or between the front seat

and door.

Notes on loading the vehicle (/ page 196)

Risk due to objects in the vehicle interior

Every vehicle occupant must make sure of the fol-

lowing in particular:

Information on the centre airbag in the driver's

seat backrest (/ page 116)

Risk due to ﬁtting accessories

They observe the information on the correct

seat position (/ page 100).

WARNING Risk of injury from objects in

the deployment area of an airbag

Do not attach accessories such as mobile naviga-

tion devices, mobile phones or cup holders, within

the deployment area of an airbag, e.g. on the

cockpit, on the door, on the side window or on the

side trim.

There are no objects between the seat, door

and door pillar (B-pillar).

Objects in the deployment area of an airbag

can hinder or prevent the correct deployment

of the airbag.

The airbag may then deploy in an uncontrolled

manner and may even cause additional inju-

ries to the vehicle occupants by deploying.

This may be the case in particular if the airbag

is integrated into the seat.

There are no hard objects, e.g. coat hangers,

hanging on the grab handles or coat hooks.

There are no heavy, sharp-edged or fragile

objects in the pockets of their clothing. Store

such objects in a suitable place.

In addition, no connecting cables, tensioning

straps or retaining straps must be routed or

attached to the vehicle within the deployment

area of an airbag. Always comply with the acces-

sory manufacturer's installation instructions and,

in particular, the notes on suitable places for

installation.

WARNING Risk of injury or death due to

blocked seat belt buckle or seat belt

anchorage

Always stow and secure objects cor-

rectly.

Before commencing your journey, make

sure that no objects are stowed in the

deployment area of an airbag.

Objects next to the front seat that block the

seat belt buckle or the moving seat belt

F206 0105 02

Occupant safety – Purpose and function of the restraint system

113

Risk due to pets in the vehicle interior

Risk due to modiﬁcation, damage or wear to the

WARNING Risk of injury or death due to

unsuitable protective covers

components of the restraint system

WARNING Risk of accident and injury due

to animals leꢀ unsecured or unattended in

the vehicle

Due to unsuitable protective covers, the air-

bags cannot protect vehicle occupants as they

are designed to do.

WARNING Risk of injury or death due to

modiﬁcations to the restraint system

If you leave animals in the vehicle unattended

or unsecured, they could press buttons or

switches, for instance.

Vehicle occupants may no longer be protected

as intended if alterations are made to the

restraint system.

You should only use protective covers

that have been approved for the corre-

sponding seat by Mercedes-Benz.

An animal may:

Never alter the parts of the restraint sys-

tem.

activate vehicle equipment and become

trapped, for example

In addition, the function of the automatic front

passenger airbag shutoﬀ could be restricted due

to an unsuitable protective cover. If the front

passenger seat is occupied, ensure that the

PASSENGER AIR BAG indicator lamps display the

correct status of the front passenger airbag

(/ page 104).

Never tamper with the wiring or any elec-

tronic component parts or their soꢀ-

switch systems on or oﬀ and endanger

other road users

ware.

Unsecured animals may be thrown about the

vehicle in the event of an accident, or sudden

steering and braking manoeuvres, and injure

vehicle occupants.

If it is necessary to modify the vehicle to accom-

modate a person with disabilities, contact a quali-

ﬁed specialist workshop.

Mercedes-Benz recommends that you use driving

aids which have been approved for your vehicle by

Mercedes-Benz.

Never leave animals unattended in the

vehicle.

Always correctly secure animals while

driving, e.g. using a suitable animal car-

rier.

F206 0105 02

Occupant safety – Purpose and function of the restraint system

114

Make sure that the seat belts are undam-

Only use the standard three-point seat

belt.

Never modify the seat belt system.

WARNING Risk of injury or death due to

aged, not worn and clean.

damaged or modiﬁed seat belts

Always have the seat belts checked

immediately aꢀer an accident at a quali-

ﬁed specialist workshop.

Seat belts cannot provide protection in the fol-

lowing situations:

WARNING Risk of injury due to modiﬁca-

tions to the cover of an airbag

the seat belt is damaged, has been modi-

ﬁed, is extremely dirty, bleached or dyed

the seat belt buckle is damaged or

extremely dirty

modiﬁcations have been made to the seat

belt tensioner, seat belt anchorage or seat

belt retractor

Mercedes-Benz recommends that you use seat

belts which have been approved for your vehicle

by Mercedes-Benz.

The seat is designed for the standard three-point

seat belt. If you ﬁt a diﬀerent multipoint seat belt,

for example a four-point seat belt, the restraint

system cannot provide the intended level of pro-

tection.

If you modify the cover of an airbag or aﬃx

objects such as stickers to it, the airbag can

no longer function as intended.

Never modify the cover of an airbag.

Do not attach any objects to the cover.

Seat belts may sustain non-visible damage in

an accident, e.g. due to glass splinters.

Modiﬁed or damaged seat belts could tear or

fail in the event of an accident, for example.

Modiﬁed seat belt tensioners could acciden-

tally trigger or fail to function as intended.

The installation location of an airbag is identiﬁed

by the AIRBAG symbol (/ page 116).

Depending on the type of vehicle, there may be

openings in the seat backrest. These openings

have no function.

WARNING Risk of injury due to malfunc-

tioning sensors in the door

WARNING Risk of injury or fatal injury due

to modiﬁed seat belt systems

The function of the airbags can be impaired

due to modiﬁcations or incorrect work per-

formed on the doors or door trim, or if the

doors are damaged.

Never modify the seat belt system, for

example the seat belt, seat belt buckle,

seat belt tensioner, seat belt anchorage

and seat belt retractor.

If you feed seat belts through the opening in

the seat backrest, the seat backrest may be

damaged or may even break in the event of an

accident.

F206 0105 02

Occupant safety

115

Never modify the doors or parts of the

doors.

Always have work on the doors or door

trim carried out at a qualiﬁed specialist

workshop.

Seat belts

Releasing seat belts

WARNING Risk of injury due to deployed

airbag

A deployed airbag no longer oﬀers any protec-

tion.

Press the release button in the seat belt

buckle and guide the seat belt back with the

seat belt tongue.

Have the vehicle towed to a qualiﬁed

specialist workshop in order to have the

deployed airbag replaced.

Risk due to components of the restraint system

which have already been deployed

Mercedes-Benz recommends that you have the

vehicle towed to a qualiﬁed specialist workshop

aꢀer an accident.

NOTE Damage caused by trapping the

seat belt

Have deployed airbags replaced immediately.

If an unused seat belt is not fully retracted, it

may become trapped in the door or in the seat

mechanism.

WARNING Risk of injury or death from

deployed pyrotechnic seat belt tensioners

WARNING Risk of burns from hot airbag

components

Always ensure that an unused seat belt

is fully retracted.

Pyrotechnic seat belt tensioners that have

been deployed are no longer operational and

are unable to perform their intended protec-

tive function.

The airbag parts are hot aꢀer an airbag has

been deployed.

Do not touch the airbag parts.

Therefore, have deployed pyrotechnic

Have a deployed airbag replaced at a

seat belt tensioners immediately

replaced at a qualiﬁed specialist work-

shop.

qualiﬁed specialist workshop as soon as

possible.

F206 0105 02

Occupant safety -> Purpose and function of the restraint system for Your Mercedes C Class 4 Door 2023

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