Manual Mercedes M-Class 2015 (page 61 of 466) (English)

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If the restraint system control unit detects a

high accident severity, additional compo-

nents of the restraint system are activated

independently of one another in certain fron-

tal collision situations:

Front air bags and driver's knee bag

Windowbag, if the system determines that

it can offer additional protection to that

provided by the seat belt

Depending on the person occupying the front-

passenger seat, the front-passenger air bag is

activated or deactivated. The front-passenger

front air bag can only be deployed in an acci-

dent if the PASSENGER AIR BAG OFF indica-

tor lamp is off. Observe the information on the

PASSENGER AIR BAG OFF indicator lamp

(Y page 45).

Your vehicle has two-stage front air bags.

During the first deployment stage, the front

air bag fills with propellant gas which reduces

the risk of injury. The second stage is then

triggered within milliseconds, filling the front

air bag with the maximum amount of propel-

lant gas.

The deployment thresholds for the Emer-

gency Tensioning Devices and air bags are

calculated on the basis of the vehicle decel-

eration or acceleration occurring at various

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

tive in nature. The air bag must be deployed

on time, at the start of the collision.

The rate of vehicle deceleration or accelera-

tion and the direction of the force are essen-

tially determined by:

distribution of the force during the impact

collision angle

deformation characteristics of the vehicle

characteristics of the object with which the

vehicle has collided

Factors which can only be seen and measured

after the collision has occurred do not play a

decisive role in the deployment of an airbag,

nor do they provide an indication of air bag

deployment.

The vehicle may be considerably deformed

without an air bag being deployed. This is the

case if only relatively easily deformable parts

have been hit and a high rate of deceleration

has not been reached. Conversely, an air bag

may be deployed even though the vehicle suf-

fers only minor deformation. This is the case

if, for example, very rigid vehicle parts such as

the longitudinal body members are hit in an

accident and the rate of deceleration is suffi-

cient.

If the restraint system control unit detects a

side impact or an overturn situation, the rel-

evant restraint system components are acti-

vated independently of one another depend-

ing on the apparent type of accident. If addi-

tional protection for the vehicle occupants is

determined in this situation, the belt tension-

ers are also triggered.

Side impact air bags on the side of the col-

lision, regardless of Emergency Tensioning

Device and use of the seat belt on the driv-

er's side and the outer seats on the second

row

The sidebag on the front-passenger side

deploys under the following conditions:

the OCS system detects that the front-

passenger seat is occupied or

the belt tongue has engaged in the belt

buckle of the front-passenger seat.

Window curtain air bag on the side of the

collision, regardless of seat belt use and

whether front-passenger seat is occupied

Windowbags on the driver's and front-

passenger sides in certain overturn situa-

tions if the system determines that they

can offer additional protection to that pro-

vided by the seat belt

Not all air bags are deployed in an acci-

dent. The various air bag systems work

independently of each other.

Occupant safety

Safety

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Mercedes M-Class 2015 Manual

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