Get Occupant safety -> Information on the automatic functions of the restraint system Guide for Mercedes C Class 4 Door 2023

Occupant safety – Information on the automatic functions of the restraint system

106

You cannot manually disable or enable the front

passenger airbag.

Information on the automatic functions of the

restraint system

Function of the automatic front passenger airbag

shutoﬀ

Information on the child restraint system

When ﬁtting a child restraint system, observe the

notes in "Children in the vehicle" (/ page 117).

A person on the front passenger seat must

observe the following information:

Sit correctly (/ page 100).

Notes on the child restraint system on the front

passenger seat

Fasten the seat belt correctly (/ page 101).

The automatic front passenger airbag shutoﬀ can

disable or enable the front passenger airbag

according to the situation.

WARNING Risk of injury or death due to

an enabled co-driver airbag

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.

Make sure you observe the following information:

The status of the front passenger airbag, see

"Function of the PASSENGER AIR BAG indica-

Status of the front passenger airbag in relation to

the stature of the person:

NEVER use a rearward-facing child

tor lamps"(/ page 104).

restraint system on a seat with an ENA-

BLED FRONT AIRBAG. DEATH or SERI-

OUS INJURY to the CHILD can occur.

When ﬁtting a child restraint system to the

Front passenger airbag disabled: PASSENGER

AIR BAG OFF lights up continuously.

front passenger seat, observe the vehicle-spe-

ciﬁc information (/ page 121).

The front passenger airbag will not be

deployed in the event of an accident. If

PASSENGER AIR BAG OFF is lit, no one may

use the front passenger seat.

Also pay particular attention to the notes on rear-

ward-facing or forward-facing child restraint sys-

tems on the front passenger seat (/ page 121).

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Occupant safety – Information on the automatic functions of the restraint system

Function of PRE-SAFE^®(anticipatory occupant

107

Front passenger airbag enabled: PASSENGER

AIR BAG ON lights up for up to 60 seconds or

until both the PASSENGER AIR BAG ON and

OFF indicator lamps go out.

The front passenger airbag may be deployed

during an accident. Observe the following

information on the correct seat position

(/ page 100).

NOTE Deployment of components of the

protection)

restraint system when the front passenger

seat is unoccupied

PRE-SAFE^®is able to detect certain critical driv-

ing situations and implement pre-emptive meas-

ures to protect the vehicle occupants.

PRE-SAFE^®can implement the following meas-

ures independently of each other:

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

Tightening the seat belts on the driver's seat

and front passenger seat.

Vehicles with rear seats: a person of smaller

stature should use a rear seat.

belt buckle of the front passenger seat and

the front passenger seat is unoccupied.

Closing the side windows.

Vehicles with sliding sunroof: closing the slid-

ing sunroof.

System limits

The front passenger airbag may otherwise be dis-

abled by mistake, for example, in the following sit-

uation:

Stow objects in a suitable place.

Vehicles with memory function: moving the

front passenger seat to a more favourable seat

position.

Only one person should use each seat

belt at any one time.

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 seat surface.

Depending on the detected accident situation, the

window airbag on the front passenger side may

deploy. The airbag is deployed regardless of

whether the front passenger seat is occupied.

Vehicles with multicontour seat: increasing the

lateral support by inﬂating the seat side bol-

sters of the seat backrest.

PRE-SAFE^®Sound: provided that the multime-

dia system is switched on, generating a brief

noise signal to stimulate the innate protective

mechanism of a person's hearing.

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Occupant safety – Information on the automatic functions of the restraint system

108

pants. These measures cannot necessarily pre-

The system will not initiate any braking application

in the following situations:

NOTE Damage caused by objects in the

footwell or behind the seat

vent an imminent impact.

PRE-SAFE^®PLUS can implement the following

measures independently of each other:

whilst driving

The automatic adjustment of the seat position

may result in damage to the seat and/or the

object.

Tightening the seat belts on the driver's seat

and front passenger seat.

when entering or exiting a parking space while

using Active Parking Assist

Stow objects in a suitable place.

Activating the rear hazard warning lights at a

higher ﬂashing frequency.

You can watch an animation on this topic via the

following link:

Reversing the PRE-SAFE^®system measures

Increasing brake pressure when the vehicle is

stationary. This brake application is cancelled

automatically when the vehicle pulls away.

If an accident did not occur, the pre-emptive

measures that were taken are reversed.

Function of PRE-SAFE^®Impulse Side

If an imminent side impact is detected, PRE-

SAFE^®Impulse Side can pre-emptively move the

front seat vehicle occupant's upper body towards

the centre of the vehicle. It does this by rapidly

inﬂating an air cushion in the outer seat side bol-

ster of the seat backrest on the side on which the

impact is anticipated. This increases the distance

between the door and the vehicle occupant.

If PRE-SAFE^®Impulse Side has been deployed or

is faulty, the PRE-SAFE impulse side inoperative

See Owner's Manual display message appears.

If an accident did not occur, the pre-emptive

measures that were taken are reversed.

You will need to perform certain settings yourself.

If the seat belt pre-tensioning is not reduced,

move the seat backrest back slightly.

The locking mechanism releases.

System limits

The system will not initiate any action in the fol-

lowing situations:

Function of PRE-SAFE^®PLUS (anticipatory occu-

pant protection plus)

PRE-SAFE^®PLUS can detect certain impacts, par-

ticularly an imminent rear impact, and take pre-

emptive measures to protect the vehicle occu-

when reversing

when the vehicle is towing a trailer and there

is a risk of a rear impact

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Occupant safety – Information on the automatic functions of the restraint system

109

Seat belt adjustment function

Overview of the automatic measures aꢀer an acci-

displaying the emergency guide in the central

dent

display (/ page 66)

Vehicles with PRE-SAFE^®: aꢀer you have fastened

the seat belt of the front seat, it may adjust itself

against your body by pulling at the shoulder until

somewhat tight. Do not hold the seat belt tightly

while it is adjusting.

This function is a reminder that all vehicle occu-

pants must wear their seat belts correctly.

You can activate and deactivate the seat belt

adjustment function using the multimedia system

(/ page 109).

switching on the interior lighting

Depending on the type and severity of the acci-

dent, and depending on the vehicle's equipment,

the following measures can be implemented, for

example:

Function of the post-collision brake aꢀer an acci-

dent

automatic braking (post-collision brake)

(/ page 109)

Depending on the accident situation, the post-col-

lision brake can minimise the severity of a further

collision or even avoid it.

If an accident is detected, the post-collision brake

can initiate automatic braking. When the vehicle

has come to a standstill, the electric parking

brake is automatically applied.

activating the hazard warning lights

triggering an automatic emergency call

(/ page 66)

switching oﬀ the engine

Activating/deactivating seat belt adjustment via

the multimedia system

To start the vehicle again, switch the vehicle

oﬀ and on once more (/ page 261). Depend-

ing on the type and severity of the accident,

you may no longer be able to start the vehicle.

The driver can cancel automatic braking by taking

the following actions:

Multimedia system:

braking more strongly than automatic braking

fully depressing the accelerator pedal with

force

Settings

Vehicle

switching oﬀ the fuel supply

Occupant protection

Plug-in hybrid: switching oﬀ the hybrid system

and high-voltage on-board electrical system

Activate or deactivate Belt adjustment.

unlocking the vehicle doors

lowering the side windows

F206 0105 02

Occupant safety -> Information on the automatic functions of the restraint system for Your Mercedes C Class 4 Door 2023

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