Manual Mercedes GLA 2015 (page 59 of 374) (English)

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If the restraint system control unit detects a

more severe accident, further components of

the restraint system are activated independ-

ently of each other in certain frontal collision

situations:

Front air bags as well as driver's and front-

passenger knee bags

Window curtain air bag, if the system deter-

mines that deployment can offer additional

protection to that provided by the seat belt

The front-passenger front air bag is activated

or deactivated depending on the person on

the front-passenger seat. The front-

passenger front air bag can only deploy in an

accident if the PASSENGER AIR BAG ON indi-

cator lamp is lit. Observe the information on

the PASSENGER AIR BAG indicator lamps

(Y page 43).

Your vehicle has two-stage front air bags.

During the first deployment stage, the front

air bag is filled with propellant gas to reduce

the risk of injuries. The front air bag is fully

deployed with the maximum amount of pro-

pellant gas if a second deployment threshold

is reached within a few milliseconds.

The deployment threshold of the Emergency

Tensioning Devices and the air bag are deter-

mined by evaluating the rate of vehicle decel-

eration or acceleration which occurs at vari-

ous points in the vehicle. This process is pre-

emptive in nature. Deployment should take

place in good 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:

the distribution of forces during the colli-

sion

the collision angle

the deformation characteristics of the vehi-

cle

the characteristics of the object with which

the vehicle has collided

Factors which can only be seen and measured

after a collision has occurred do not play a

decisive role in the deployment of an air bag,

nor do they provide an indication of air bag

deployment.

The vehicle can be deformed considerably,

without an air bag being deployed. This is the

case if only parts which are relatively easily

deformed are affected and the rate of decel-

eration is not high. Conversely, air bags may

be deployed even though the vehicle suffers

only minor deformation. This is the case if, for

example, very rigid vehicle parts such as lon-

gitudinal body members are hit, and sufficient

deceleration occurs as a result.

If the restraint system control unit detects a

side impact or that the vehicle is rolling over,

the relevant restraint system components are

activated independently of one another

depending on the apparent type of accident.

If the system determines a need for additional

protection for the vehicle occupants, the

Emergency Tensioning Devices are deployed.

Side impact air bags on the side of impact,

independently of the Emergency Tension-

ing Device and the use of the seat belt on

the driver's seat and outer seats in the sec-

ond row

The side impact air bag on the front-

passenger side (front) deploys in the fol-

lowing situations:

the OCS system detects that the front-

passenger seat is occupied or

the belt tongue is engaged in the belt

buckle of the front-passenger seat

Window curtain air bag on the side of

impact, independently of the use of the

seat belt and independently of whether the

front-passenger seat is occupied

Window curtain air bags on the driver's and

front-passenger side in certain situations

when the vehicle rolls over, if the system

determines that deployment can offer addi-

tional protection to that provided by the

seat belt

Not all air bags are deployed in an acci-

dent. The different air bag systems work

independently of each other.

Occupant safety

Safety

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Mercedes GLA 2015 Manual

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