Get Occupant safety -> Seat belts Guide for Mercedes C Class 4 Door Fourth Generation (2014-2021)

Occupant safety 37

The front passenger airbag can only be deployed If the seat belt tensioners are triggered or an air‐

WARNING Risk of injury or death due to

incorrectly fastened seat belt

in an accident if the PASSENGER AIR BAG OFF

indicator lamp is off. If the front passenger seat

is occupied, make sure, both before and during

the journey, that the status of the front

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

small amount of powder may also be released:

If the seat belt is not worn correctly, it can‐

not perform its intended protective function.

In addition, an incorrectly fastened seat belt

can also cause injuries, for example, in the

event of an accident or when braking or

changing direction suddenly.

The bang will not generally affect your hear‐

ing.

passenger airbag is correct (/ page 46).

In general, the powder released is not haz‐

ardous to health but may cause short-term

breathing difficulties to persons suffering

from asthma or other pulmonary conditions.

Provided it is safe to do so, leave the vehicle

immediately or open the window in order to

prevent breathing difficulties.

WARNING Risk of burns from hot airbag

components

The airbag parts are hot after an airbag has

been deployed.

Always ensure that all vehicle occu‐

pants have their seat belts fastened

correctly and are sitting properly.

Do not touch the airbag parts.

Have a deployed airbag replaced at a

qualified specialist workshop as soon

as possible.

Always observe the instructions about the cor‐

rect driver's seat position and adjusting the seat

(/ page 95).

In order for the correctly worn seat belt to pro‐

vide the intended level of protection, each vehi‐

cle occupant must observe the following infor‐

mation:

Seat belts

Protection provided by the seat belt

Mercedes-Benz recommends that you have the

vehicle towed to a qualified specialist workshop

after an accident. Take this into account, partic‐

ularly if a seat belt tensioner is triggered or an

airbag deployed.

Always fasten your seat belt correctly before

starting a journey. A seat belt can only provide

the best level of protection if it is worn correctly.

The seat belt must not be twisted and must

fit tightly and snugly across the body.

38 Occupant safety

The seat belt must be routed across the

centre of the shoulder and as low down

across the hips as possible.

The shoulder section of the seat belt should

not touch your neck nor be routed under

your arm or behind your back.

Avoid wearing bulky clothing, e.g. a winter

coat.

Push the lap belt down as far as possible

securing objects, luggage or loads

the shoulder belt is routed across the

centre of your shoulder.

(/ page 107).

Also ensure that no objects, e.g. a cushion,

are ever placed between a person and the

seat.

WARNING Risk of injury or death when

additional restraint systems are not used

for persons with a smaller stature

If children are travelling in the vehicle, be sure to

observe the instructions and safety notes on

"Children in the vehicle" (/ page 51).

Persons under 1.50 m tall cannot wear the

seat belt correctly without a suitable addi‐

tional restraint system.

across your hips and pull tight with the shoul‐

der section of the belt. Never route the lap

belt across your abdomen.

Limitations of the protection provided by the

seat belt

Always secure persons under 1.50 m

tall in a suitable restraint system.

Pregnant women must also take particular

care with this.

Never route the seat belt across sharp, poin‐

ted, abrasive or fragile objects.

WARNING Risk of injury or death due to

an incorrect seat position

WARNING Risk of injury or death due to

damaged or modified seat belts

The seat belt does not offer the intended

level of protection if you have not moved the

seat backrest to an almost vertical position.

You could slip beneath the seat belt and

injure yourself.

Seat belts cannot provide protection in the

following situations:

Only one person should use each seat belt at

the seat belt is damaged, has been modi‐

fied, is extremely dirty, bleached or dyed

the seat belt buckle is damaged or

extremely dirty

any one time. Never allow babies and chil‐

dren to travel sitting on the lap of another

vehicle occupant.

Adjust the seat properly before com‐

mencing your journey.

Always ensure that the seat backrest is

in an almost vertical position and that

Never secure objects with a seat belt if the

seat belt is also being used by one of the

vehicle's occupants. Always observe the

instructions for loading the vehicle when

Occupant safety 39

Releasing the rear centre seat belt

modifications have been made to the seat

belt tensioner, seat belt anchorage or

seat belt retractor

WARNING Risk of injury or death from

deployed pyrotechnic seat belt tension‐

ers

If the left-hand rear seat backrest is folded down

and back up again, it may not be possible to pull

out the rear centre seat belt. The seat belt must

be released.

Pyrotechnic seat belt tensioners that have

been deployed are no longer operational and

are unable to perform their intended protec‐

tive function.

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.

Pull the seat belt out approximately 25 mm

at the seat belt outlet on the seat backrest

and then release it again.

Therefore, have deployed pyrotechnic

The seat belt is retracted and released.

seat belt tensioners immediately

replaced at a qualified specialist work‐

shop.

Never modify the seat belt system, for

Fastening and adjusting seat belts

example the seat belt, seat belt buckle,

seat belt tensioner, seat belt anchorage

and seat belt retractor.

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.

Mercedes-Benz recommends that you have the

vehicle towed to a qualified specialist workshop

after an accident.

Make sure that the seat belts are

undamaged, not worn and clean.

NOTE Damage caused by trapping the

seat belt

Always have the seat belts checked

immediately after an accident at a

qualified specialist workshop.

If an unused seat belt is not fully retracted, it

may become trapped in the door or in the

seat mechanism.

Mercedes-Benz recommends that you use seat

belts which have been approved for your vehicle

by Mercedes-Benz.

Always ensure that an unused seat belt

is fully retracted.

40 Occupant safety

Vehicles with automatic front passenger air‐

bag shutoff:

also deploy in the event of an accident along

with other systems.

Only one person should use each seat

belt at any one time.

NOTE Deployment of the seat belt ten‐

sioner and side impact airbag when the

front passenger seat is unoccupied

Seat belt adjustment function

If the seat belt tongue is engaged in the seat

belt buckle of the unoccupied front

passenger seat, the seat belt tensioner and

the side impact airbag may also deploy in the

event of an accident along with other sys‐

tems.

Vehicles with PRE-SAFE^®: if the front seat belt

is not pulled tightly across your body, the seat

belt adjustment may automatically apply a cer‐

tain 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 sys‐

tem (/ page 41).

Only one person should use each seat

belt at any one time.

Vehicles without automatic front passenger

airbag shutoff:

Always engage seat belt tongue 2 of the

seat belt into seat belt buckle 1 of the cor‐

Releasing a seat belt

responding seat.

NOTE Deployment of the seat belt ten‐

sioner when the front passenger seat is

unoccupied

Press and hold the seat belt outlet release

Press the release button in the seat belt

and slide seat belt outlet 3 into the desired

buckle and guide the seat belt back with the

seat belt tongue.

position.

If the seat belt tongue is engaged in the seat

belt buckle of the unoccupied front

passenger seat, the seat belt tensioner may

Let go of the seat belt outlet release and

ensure that seat belt outlet 3 locks into

position.

Occupant safety -> Seat belts for Your Mercedes C Class 4 Door Fourth Generation (2014-2021)

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