19
Seat belts
Why wear seat belts? Frontal collisions and the laws of physics
Fig. 5 Vehicle about to
hit a wall: the vehicle oc-
cupants are not wearing
seat belts
Fig. 6 The vehicle hits
the wall: the vehicle oc-
cupants are not wearing
seat belts It is easy to explain how the laws of physics work in the case of a head-on
collision: when a vehicle starts moving
⇒ Fig. 5 it generates a certain
amount of energy known as “kinetic energy” both in the vehicle and in the
vehicle occupants.
The higher the speed and the greater the weight of the vehicle, the more
energy there is to be absorbed in an accident.
The most significant factor, however, is the speed of the vehicle. If the
speed doubles from 25 km/h (15 mph) to 50 km/h (30 mph), for example,
the kinetic energy is multiplied by four.
The amount of kinetic energy depends on the speed of the vehicle and the
weight of the vehicle and its passengers. The higher the speed and the
greater the weight of the vehicle and the vehicle occupants, the more ener-
gy there is to be absorbed in an accident.
Vehicle occupants not wearing seat belts are not “attached” to the vehicle.
As a result, in a frontal collision they will continue to move forward at the
speed their vehicle was travelling just before the impact until something
stops them! Because the vehicle occupants in our example are not restrain-
ed by seat belts, all of the occupants' kinetic energy has to be absorbed at
the point of impact ⇒ Fig. 6.
At speeds of 30 km/h to 50 km/h (19 to 31 mph), the forces acting on bod-
ies in a collision can easily exceed one tonne (1000 kg). At greater speed
these forces are even higher.
This example applies not only to head-on collisions, but to all accidents and
collisions.
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Seat belts
Seat belt protection
Fig. 9 Drivers with prop-
erly worn seat belts will
not be thrown forward in
the event of sudden brak-
ing
Wearing a correctly fastened seat belt can significantly change the situa-
tion. Properly worn seat belts hold the vehicle occupants in the correct sit-
ting positions and substantially reduce the kinetic energy in the event of an
accident. Seat belts also help to prevent uncontrolled movements that
could lead to severe injuries. In addition, properly worn seat belts reduce
the danger of being thrown from the car ⇒ Fig. 9.
Passengers wearing their seat belts correctly benefit greatly from the ability
of the belts to absorb kinetic energy. The front crumple zones and other
passive safety features (such as the airbag system) are also designed to ab-
sorb the kinetic energy generated in a collision. Taken together, all these
features reduce the energy released and decrease the risk of injury.
Our examples describe frontal collisions. Of course, properly worn seat belts
substantially reduce the risk of injury in all other types of accidents. This is
why it is so important to fasten seat belts before every trip, even when just
driving “around the corner”. Ensure that your passengers wear their seat
belts as well. Accident statistics have shown properly worn seat belts to be an effective
means of considerably reducing the risk of severe injury and improving the
chances of survival in a serious accident. Furthermore, properly worn seat
belts improve the protection provided by deployed airbags in the event of
an accident. For this reason, wearing a seat belt is required by law in most
countries.
Although your vehicle is equipped with airbags, the seat belts must be fas-
tened and worn. The front airbags, for example, are only triggered in some
frontal accidents. The front airbags will not be triggered during minor frontal
collisions, minor side collisions, rear collisions, rolls or accidents in which
the airbag trigger threshold value in the control unit is not exceeded.
Therefore, you should always wear your seat belt and ensure that your pas-
sengers have fastened their seat belts properly before you drive off!
Seat belts Using seat belts
Checklist
Using seat belts ⇒ :
● Check the condition of all the seat belts at regular intervals.
● Keep the seat belts clean.
● Keep the belt web, the latch plate and the buckle free of foreign bodies
and liquids.
● Do not jam or damage the seat belt or the latch plate when closing the
door, for example.
● Never remove, modify or repair the seat belt or belt fastening mecha-
nisms.
● Fasten your seat belt properly before each trip and keep it fastened.
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Seat belts
Fastening the seat belt
Fasten your seat belt before each trip.
● Adjust the front seat and head restraint correctly ⇒ page 10.
● Engage the seat backrest of the rear seat in an upright position ⇒
.
● Pull the latch plate and place the belt webbing evenly across your chest
and lap. Do not twist the seat belt when doing so ⇒
.
● Engage the latch plate in the buckle of the corresponding seat ⇒ Fig. 10.
● Pull the belt to ensure that the latch plate is securely engaged in the
buckle.
Unfastening the seat belt
The seat belt must not be unfastened until the vehicle has come to a stand-
still ⇒
.
● Press the red button on the buckle ⇒ Fig. 11. The latch plate is released
from the buckle.
● Guide the belt back by hand so that it rolls up easily and the trim will not
be damaged.
WARNING
An incorrectly worn seat belt web can cause severe or fatal injuries in the
event of an accident.
● The seat belt cannot offer its full protection unless the seat backrests
are in an upright position and the seat belt is worn correctly, according to
your size.
● Unbuckling your seat belt while the vehicle is in motion can cause se-
vere or fatal injuries in the event of an accident or sudden braking.
Fastening or unfastening the seat belt with two buckles
Fig. 12 Fasten the seat
belt on the centre seat in
the second row of seats
Properly worn seat belts hold the vehicle occupants in the position that
most protects them in the event of an accident or sudden braking ⇒
.
The seat belts for the centre seat in the second row of seats and for the
seats in the third row of seats are fastened using two buckles.
Fastening the seat belt
Fasten your seat belt before each trip.
● Adjust the rear seat and head restraint correctly
⇒ page 10.
● Engage the seat backrest of the rear seat in an upright position
⇒
.
● Use latch plate of the belt
⇒ Fig. 12 1 to pull the seat belt down. Do
not
twist the seat belt when doing so ⇒ .
● Engage the latch plate 1 in the buckle of the corresponding seat A.
● Use the latch plate
⇒ Fig. 12 2 to pull the seat belt across your lap.
● Engage the latch plate 2 in the buckle of the corresponding seat B.
● Pull the belt to ensure that both latch plates are securely engaged in the
buckles.
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Seat belts
Seat belt position
Fig. 13 Correct belt web and head restraint positions
Fig. 14 Correct position-
ing of seat belts during
pregnancy
Seat belts offer their maximum protection in the event of an accident and
reduce the risk of sustaining severe or fatal injuries only when they are
properly positioned. Furthermore, if the webbing is correctly positioned, the
seat belt will hold the vehicle occupants in the optimum position to ensure the airbag provides the utmost protection. The seat belt must therefore al-
ways be worn and the webbing correctly positioned.
Incorrectly worn seat belts can cause severe or even fatal injuries
⇒ page 10, Adjusting the seat position.
Correct seat belt position
●
The shoulder part of the seat belt must lie on the centre of the shoulder,
never across the neck or the arm, under the arm or behind the shoulder.
● The lap part of the seat belt must lie across the pelvis, never across the
stomach.
● The seat belt must lie flat and fit comfortably. Pull the belt tight if neces-
sary to take up any slack.
In the case of pregnant women , the seat belt must lie evenly across the
chest and as low as possible over the pelvis, never across the stomach and
must be worn properly at all times during the pregnancy ⇒ Fig. 14.
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Seat belts
WARNING
Never adjust the belt height while the vehicle is in motion.
Seat belt tensioners
Automatic belt retainer, belt tensioner, belt tension limiter
Seat belts are part of the vehicle safety concept ⇒ page 32 and consist of
the following important functions:
Automatic belt retainer
Every seat belt is equipped with an automatic belt retainer on the shoulder
belt. If the belt is pulled slowly or during normal driving, the system allows
for total freedom of movement on the shoulder belt. However, during sud-
den braking, during travel in mountains or bends and during acceleration,
the automatic belt retainer on the seat belt is locked is pulled quickly.
Belt tensioners
The seat belts on the front seats and the outer seats of the second row are
equipped with belt tensioners.
Sensors will trigger the belt tensioners during severe head-on, lateral and
rear collisions and retract and tighten the seat belts. If the seat belt is
loose, it is retracted to reduce the forwards movement of vehicle occupants
or movement in the direction of the collision. The belt tensioner works in
combination with the airbag system. The belt tensioner will not be triggered
in the event of the vehicle overturning if the side airbags are not deployed.
If the belt tensioner is triggered, a fine dust is produced. This is normal and
it is not an indication of fire in the vehicle. Belt tension limiter
The belt tension limiter reduces the force of the seat belt on the body in the
event of an accident.
Note
The relevant safety requirements must be observed when the vehicle or
components of the system are scrapped. These requirements are known to
specialised workshops ⇒ page 27.
Service and disposal of belt tensioners
If you work on the belt tensioners or remove and install other parts of the
vehicle when performing other repair work, the seat belt may be damaged.
The consequence may be that, in the event of an accident, the belt tension-
ers function incorrectly or not at all.
So that the effectiveness of the belt tensioner is not reduced and that re-
moved parts do not cause any injuries or environmental pollution, regula-
tions must be observed. These requirements are known to specialised work-
shops.
WARNING
Improper handling and homemade repairs of seat belts, automatic belt
retainers and tension devices increase the risk of sustaining severe or fa-
tal injuries. The belt tensioner may fail to trigger or may trigger in the
wrong circumstances.
● Never attempt to repair, adjust or remove or install parts of the belt
tensioners or seat belts. Any work must be performed by a specialised
workshop only ⇒ page 261.
● Belt tensioners and automatic belt retainers cannot be repaired and
must be replaced.
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Airbag system
Airbag system
Brief introduction Introduction
Front airbags have been installed for both driver and passenger. The front
airbags can also protect the chest and head of driver and passenger if the
seats, seat belts head restraints and, for the driver, the steering wheel are
correctly adjusted and used. Airbags are considered as additional safety
equipment. An airbag cannot replace the seat belt, which must be worn at
all times, even in front seats where front airbags have been installed.
Additional information and warnings:
● Driving tips ⇒ page 7
● Correct sitting positions ⇒ page 10
● Seat belts ⇒ page 21
● Child seats (accessories) ⇒ page 39
● Care and cleaning of the vehicle interior ⇒ page 253
● Accessories, parts replacement, repairs and modifications ⇒ page 261
● Notes for the user ⇒ page 259
WARNING
Never exclusively trust the airbag system as a means of protection.
● Even when triggered, airbag protection is only auxiliary.
WARNING (Continued)
● The airbags provide the best protection when the seat belts are prop-
erly fastened, thus reducing the risk of sustaining injuries ⇒ page 21,
Seat belts.
● Before each trip, every occupant must sit properly, correctly fasten
the seat belt belonging to his or her seat and keeping it fastened
throughout the trip. This rule is valid for all vehicle occupants.
WARNING
Vehicle occupants sitting in the front of the vehicle must never carry any
objects in the deployment space between them and the airbags, as this
increases the risk of sustaining injuries if the airbag is triggered. This
modifies the airbag deployment space or the objects may fly uncontrolla-
bly and hit your body.
● Never carry objects in your hand or on your lap while the vehicle is in
motion.
● Never transport objects on the front passenger seat. In the event of
sudden braking and manoeuvres, the objects may end up in the airbag
deployment space and fly uncontrollably around the vehicle interior if the
airbag is activated.
● Vehicle occupants of the front and outer rear seats must never carry
any other people, pets or objects in the deployment space between them
and the airbags. Make sure children and other passengers also respect
this recommendation.
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Airbag system
Control lamp
Fig. 16 Control lamp for
disabling the front pas-
senger front airbag on
the dash panel
lights upDigitPossible causeSolution
Instrument
panelFault in airbag sys-
tem and seat belt
tensioners.Have the system checked
immediately by a special-
ised workshop.
Dash panel
Fault in the airbag
system.Have the system checked
immediately by a special-
ised workshop.
Front passenger front
airbag disabled.Check whether the airbag
should remain disabled.
Several warning and control lamps should light up for a few seconds when
the ignition is switched on, signalling that the function is being verified.
They will switch off after a few seconds.
If the PASSENGER AIR BAG control lamp does not remain lit or if it is lit
together with the control lamp on the instrument panel and the front pas-
senger front airbag is disabled, there may be a fault in the airbag system
⇒
.
WARNING
In the event of a fault in the airbag system, the airbag may not trigger
correctly, may fail to trigger or may even trigger unexpectedly, leading to
severe or fatal injuries.
● Have the airbag system checked immediately by a specialised work-
shop.
● Never mount a child seat in the front passenger seat or remove the
mounted child seat! The front passenger front airbag may deploy during
an accident in spite of the fault.
CAUTION
Always pay attention to any lit control lamps and to the corresponding de-
scriptions and instructions to avoid damage to the vehicle.
Airbag system Description and function of the airbag
The airbag can protect vehicle occupants in the event of an accidents, cush-
ioning the movement of the occupants in the direction of the collision in
frontal and side accidents.
Deployed airbags fill with a propellant gas. This causes the airbag covers to
break and the airbags to deploy extremely quickly in their entire deploy-
ment space within fractions of a second. When an occupant with the seat
belt properly fastened puts pressure on the inflated airbag, the propellant
gas escapes to absorb the force of the impact and slow the movement. This
reduces the risk of severe or fatal injuries. Airbag deployment does not
mean that other types of injury such as swelling, bruising, burns and skin
injuries can be ruled out.
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Airbag system
Front airbags
Fig. 17 Location and deployment area of the front air-
bag for the driver
Fig. 18 Location and deployment area of the front air-
bag for the front passenger
In conjunction with the seat belts, the front airbag system gives the driver
and the front passenger additional protection for the head and chest in the
event of a severe frontal collision. Always remains as far away as possible
from the front airbag. This way, the front airbags can completely deploy
when triggered, providing their maximum protection. The front airbag for the driver is located in the steering wheel
⇒ Fig. 17 and
the airbag for the front passenger is located in the dash panel ⇒ Fig. 18. Air-
bags are identified by the word “AIRBAG”.
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