Passive Safety
152
WARNING
•The front seats and the head restraints must always be adjusted
to match the body size of the seat occupant as well as the seat belts
must always be correctly fastened in order to provide an optimal
protection for you and your occupants.
•The driver must maintain a distan ce of at least 25 cm to the
steering wheel ⇒page 151, fig. 132 . Not maintaining this minimum
distance will mean that the airbag system will not be able to prop-
erly protect you - hazard!
•When driving, hold the steering wheel with both hands firmly on
the outer edge in the 9 o'clock and 3 o'clock position. Never hold
the steering wheel firmly in the 12 o'clock position or in another
way (e.g. in the middle of the steering wheel or at the inner steering
wheel edge). In such cases, injuries to the arms, the hands and the
head can occur when the driver airbag is deployed.
•The backrests must not be angled too far back when driving
otherwise this will affect proper operation of the seat belts and of
the airbag system - risk of injury!
•Ensure that there are no objects in the footwell as any objects
may get behind the pedals during a driving or braking manoeuvre.
You would then no longer be able to operate the clutch, to brake or
accelerate.
Correct seated position for the front passenger
The front passenger must maintain a distance of at least
25 cm from the dash panel so that the airbag offers the
greatest possible safety when an airbag is deployed.
For the safety of the front passenger and to reduce the risk of injury in the
event of an accident, we recommend the following setting.
•Adjust the front passenger seat as far as possible to the rear.
•Adjust the head restraint so that the top edge of the head restraint is
at the same level as the upper part of your head ⇒page 151, fig. 133 .
•Fasten the seat belt correctly ⇒page 158.
In exceptional cases the front passenger airbag can be deactivated
⇒ page 171, “Deactivating an airbag”.
Manual front passenger adjustment ⇒page 73, “Adjusting front seats
manually”.
Electrical front passenger seat adjustment ⇒page 74, “Adjusting seats”.
WARNING
•The front seats and the head restraints must always be adjusted
to match the body size of the seat occupant as well as the seat belts
must always be correctly fastened in order to provide an optimal
protection for you and your occupants.
•The front passenger must maintain a distance of at least 25 cm
to the dash panel. Not maintaining this minimum distance will
mean that the airbag system will not be able to properly protect you
- hazard!
•Always keep your feet in the footwell when the car is being
driven - never place your feet on the instrument panel, out of the
window or on the surfaces of the seats. You will be exposed to
increased risk of injury if it becomes necessary to apply the brake
or in the event of an accident. If an airbag is deployed, you may
suffer fatal injuries when adopting an incorrect seated position!
•The backrests must not be angled too far back when driving
otherwise this will affect proper operation of the seat belts and of
the airbag system - risk of injury!
s3ec.book Seite 152 Montag, 2. Mai 2005 3:42 15
Passive Safety153
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
Correct seated position for th e occupants on the rear
seats
Occupants on the rear seats must sit upright, keep the feet
in the footwell and must have their seat belts correctly
fastened.
To reduce the risk of injury in the event of a sudden braking manoeuvre or
an accident, the occupants on the rear seats must observe the following.
•Adjust the head restraints so that the top edge of the head restraints
are at the same level as the upper part of your head ⇒page 151, fig. 133 .
•Fasten the seat belt correctly ⇒page 158, “How are seat belts
correctly fastened?”.
•If you are transporting ⇒page 174, “Transporting children safely” chil-
dren in the vehicle, please use a suitable child restraint system.
WARNING
•The head restraints must always be adjusted to match the body
size, in order to offer an optimal protection for you and your occu-
pants.
•Always keep your feet in the footwell when the car is being
driven - never put your feet out of the window or on the surfaces of
the seats. You will be exposed to increased risk of injury if it
becomes necessary to apply the brake or in the event of an acci-
dent. If an airbag is deployed, you may suffer fatal injuries when
adopting an incorrect seated position!
•If the occupants on the rear seats are not sitting upright, the risk
of injury is increased due to in correct routing of the seat belt.
Examples of an incorrect seated position
An incorrect seated position can lead to severe injuries or
death for the occupants.
Seat belts offer their optimum protection only if the webbing of the seat
belts is properly routed. Incorrect seated positions considerably reduce
the protective functions of the seat belts and therefore increase the risk of
injury due to an incorrect routing of the seat belt. The driver is fully respon-
sible for himself and the occupants, in particular for the children. Do not
permit an occupant to adopt an incorrect seated position when the car is
moving.
The following list contains the examples of seated positions which are
dangerous for the occupants. This list is not complete, however we would
like you to get interested in this subject.
Therefore, while the car is moving never:
•stand up in the vehicle,*
•stand up on the seats,*
•kneel onto the seats,
•tilt the backrest fully to the back,*
•lean against the dash panel,*
•lie on the rear seats,
•only sit on the front area of the seat,*
•sit to the side,*
•lean out of the window,
•put the feet out of the window,*
•put the feet on the dash panel,*
•put the feet on the seat upholstery,*
•occupy the footwell,*
•have the seat belt not fastened,*
s3ec.book Seite 153 Montag, 2. Mai 2005 3:42 15
Seat belts
158
How are seat belts correctly fastened?
Fastening a three-point seat belt
Fasten your seat belt before starting!
– Correctly adjust the front seat and the head restraint before
fastening your seat belt ⇒page 151, “Correct seated posi-
tion”.
– Slowly pull the belt webbing at the tongue of the lock over your chest and pelvis ⇒.
– Insert the tongue of the lock into the seat belt buckle belonging to the seat until it is heard to lock in place.
– Pull on the belt to check that it has also reliably engaged in the lock.
Each three-point seat belt is equipped with an inertia reel. This inertia reel
offers you complete freedom of movement if the belt is unreeled slowly. If
the brakes are applied suddenly, the inertia reel will block. It also blocks
the belts when the car accelerates, when driving uphill and when
cornering.
Expectant mothers must also wear the seat belt ⇒.
WARNING
•The shoulder part of the seat belt must never run across your
neck but must run approximately over the middle of the shoulder
and fit snugly against the chest. The lap part of the belt must run
across the hip and must never be routed across the stomach. It
must always fit snugly ⇒fig. 137. Adjust the belt webbing as
required.
•The lap part of the belt should be positioned as low as possible
at the pelvis of an expectant mother in order to avoid exerting any
pressure on the lower abdomen.
•Always ensure that the webbing of the seat belts is properly
routed. Seat belts which are not correctly adjusted can themselves
cause injuries even in minor accidents.
Fig. 137 Routing of
webbing over the
shoulders and the lap
belt
Fig. 138 Routing of
belt webbing for an
expectant mother
s3ec.book Seite 158 Montag, 2. Mai 2005 3:42 15
Intelligent Technology185
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
Driving Tips
Intelligent Technology
Electronic stability programme (ESP)*
General
General
The ESP aids you maintain control of your vehicle in situations in border-
line driving situations such as when negotiating a curve too fast. The risk
of skidding is reduced and your car thus offers greater driving stability
depending on the conditions of the road surface. This occurs at all speeds.
The following systems are integrated into the electronic stability
programme:
•Electronic Differential Lock (EDL),
•Traction control system (TCS),
•Antilock brake system ABS,
•Brake Assist.
Operating principle
The ESP switches on automatically when the engine is started and then
conducts a self-test. The ESP control unit processes data from the indi-
vidual systems. It also processes additional measurement data which are
supplied by highly sensitive sensors: the rotational velocity of the vehicle
about its vertical axis, the lateral acceleration of the vehicle, the braking
pressure and the steering angle.
The direction which the driver wishes to take is determined based on the
steering angle and the speed of the vehicle and is constantly compared
with the actual behaviour of the vehicle. If differences exist, such as the
car beginning to skid, the ESP will automatically brake the appropriate
wheel.
The car is stabilised again by the forces which take effect when the wheel
is braked. Intervention into the brake system takes place primarily on the
outer front wheel of a vehicle which tends to oversteer (tendency for the
rear of the vehicle to break away) while occurs this is on the inner rear
wheel of a vehicle which tends to understeer (tendency to shift out of the
curve). This braking control cycle is accompanied by noises.
The ESP operates in combination with the ABS ⇒page 189, “Antilock
brake system (ABS)”. If there is a fault in the ABS system, the ESP also
does not operate.
Fig. 160 ESP switch
s3ec.book Seite 185 Montag, 2. Mai 2005 3:42 15
Intelligent Technology
186
The ESP warning light ⇒page 35 lights up in the instrument cluster when
there is a fault on the ESP.
Switching off
You can switch the ESP off and on again as you wish, by pressing the
button ⇒page 185, fig. 160 . The ESP warning light ⇒ page 35 lights up
in the instrument cluster when the ESP is switched off.
The ESP should normally always be switched on. It may be good practice
to switch the system off only in particular exceptional situations if you
desire wheel slip.
Examples:
•when driving with snow chains,
•when driving in deep snow or on a loose surface,
•when it is necessary to rock a car free when it has become stuck.
then you should switch on the ESP again.
WARNING
It is also not possible for the E SP to overcome the physical limits
of the vehicle. Even if a vehicle fitted with ESP you should still
always adapt your style of driving to the condition of the road
surface and the traffic situation. This particularly applies when
driving on slippery and wet roads. The increased safety offered
must not tempt you to take greater risks than otherwise - risk of an
accident!
Note
•All four wheels must be fitted with the same tyres in order to achieve
problem-free operation of the ESP. Differing rolling circumferences of the
tyres can lead to an undesirable reduction in the engine output.
•Changes to vehicle (e.g. on engine, on the brakes, on chassis or other
assignment of tyres and wheels) can influence the function of the ESP
⇒ page 243.
Traction control system (TCS)*
The traction control system prevents the driven wheels
from spinning when accelerating.
General
The TCS makes it much easier, and sometimes at all possible, to start off,
accelerate and climb a steep hill when the conditions of the road surface
are unfavourable.
Operating principle
The TCS switches on automatically when the engine is started and then
conducts a self-test. The system monitors the speeds of the driven wheels
with the aid of the ABS sensors. If the wheels are spinning, the force trans-
Fig. 161 TCS switch
s3ec.book Seite 186 Montag, 2. Mai 2005 3:42 15
Intelligent Technology187
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
mitted to the road surface is automatically adapted by reducing the engine
speed. This occurs at all speeds.
The TCS operates in combination with the ABS
⇒page 189, “Antilock
brake system (ABS)”. The TCS will not function if a fault exists in the ABS
system.
The TCS warning light ⇒page 35 lights up in the instrument cluster when
there is a fault on the TCS.
Switching off
You can switch the TCS off and on again as you wish by pressing the
button ⇒page 186, fig. 161 . The TCS warning light ⇒page 35 lights up
in the instrument cluster when the TCS is switched off.
The TCS should normally always be switched on. It may be good practice
to switch the system off only in particular exceptional situations if you
desire wheel slip.
Examples:
•when driving with snow chains,
•when driving in deep snow or on a loose surface,
•when it is necessary to rock a car free when it has become stuck.
then you should switch on the TCS again.
The EDL ⇒page 187, “Electronic Differential Lock (EDL)” is a part of the
TCS. THE EDL operates independently of the TCS (also when the TCS
has been switched off using the TCS button).
WARNING
You should always adjust your style of driving to the conditions of
the road surface and the traffic situation. The increased safety
offered must not tempt you to take greater risks than otherwise -
risk of an accident!
Note
•All four wheels must be fitted with the same tyres in order to achieve
problem-free operation of the TCS. Differing rolling circumferences of the
tyres can lead to an undesirable reduction in the engine output.
•Changes to vehicle (e.g. on engine, on the brakes, on chassis or other
assignment of tyres and wheels) can influence the function of the TCS
⇒ page 243, “Accessories, changes and replacement of parts”.
Electronic Differential Lock (EDL)
The electronic differential lock prevents an individual
wheel from slipping.
General
The EDL makes it much easier, and sometimes at all possible, to start off,
accelerate and climb a steep hill when the conditions of the road surface
are unfavourable.
Operating principle
The EDL is activated automatically, that is without any action on the part
of the driver. It monitors the speeds of the driven wheels with the aid of the
ABS sensors. Should only one drive wheel begin spinning on a slippery
surface there will be an appreciable difference in the speed of the driven
wheels. The EDL function brakes the slipping wheel and the differential
transmits a greater driving force to the other driven wheel. This control
process is also accompanied by noises.
Overheating of the brakes
The EDL switches off automatically if unusually severe stresses exist in
order to avoid excessive heat generation in the disc brake on the wheel
which is being braked. The vehicle can continue to be driven and has the
same characteristics as a vehicle not fitted with EDL.
s3ec.book Seite 187 Montag, 2. Mai 2005 3:42 15
Intelligent Technology
188
The EDL switches on again automatically as soon as the brake has cooled
down.
WARNING
•Depress the accelerator carefully when accelerating on
uniformly slippery road surfaces, such as ice and snow. The driven
wheels might still spin despite the EDL and affect the stability of
the vehicle - risk of an accident!
•You should always adapt your style of driving to the condition
of road surface and to the traffic situation even when your vehicle
is fitted with EDL. The increased safety offered must not tempt you
to take greater risks than otherwise - risk of an accident!
Note
•If the ABS warning light comes on, this may also indicate a fault in the
EDL. Please have the car inspected as soon as possible by a specialist
garage.
•Changes to vehicle (e.g. on engine, on the brakes, on chassis or other
assignment of tyres and wheels) can influence the function of the EDL
⇒ page 243, “Accessories, changes and replacement of parts”.
Brakes
What has a negative effect on braking efficiency?
Wear-and-tear
Wear-and-tear to the brake pads is greatly dependent on the operating
conditions of the vehicle and your style of driving. Particularly if you drive
a great deal in towns and over short distances or if you adopt a sporty style of driving, it may be necessary to have the thickness of the brake pads
inspected at a specialist garage between the service inspections.
Wet roads or road salt
There may be a certain delay before the brakes take full effect under
certain conditions such as when driving through water, during heavy rain
showers or after the vehicle has been washed in an automatic vehicle
wash, since the brake discs and brake pads may be moist or even have a
coating of ice on them in winter. You should dry the brakes as soon as
possible (by applying and releasing the brakes several times, if the road
conditions and the traffic situation allows it).
There also may be a certain delay before the full braking efficiency is
available when driving on roads which have been treated with road salt if
you have not used the brakes for some considerable time beforehand.
The layer of salt on the brake discs and brake pads must first be rubbed
off when you apply the brakes.
Corrosion
Corrosion on the brake discs and dirt on the bake pads occur if the vehicle
has been parked for a long period and if you do not make much use of the
braking system.
We recommend cleaning the brake discs by firmly applying the brakes at
a fairly high speed if you do not make much use of the braking system or
if surface corrosion is present
⇒.
Faults in the brake surface
If you notice that the braking distance has suddenly become longer and
that the brake pedal can be depressed further, it is possible that a brake
circuit of the dual-circuit brake system has failed. Drive, in such cases, to
the nearest specialist garage without delay in order to have the problem
rectified. Drive at a reduced speed while on your way to the dealer and
adapt your style of driving to the higher brake pedal pressure required.
s3ec.book Seite 188 Montag, 2. Mai 2005 3:42 15
Intelligent Technology189
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
Low brake fluid level
An insufficient level of brake fluid may result in problems in the brake
system. The level of the brake fluid is monitored electronically
⇒page 37,
“Brake system ”.
WARNING
•Only apply the brakes for the purpose of drying and cleaning the
brake discs if the traffic conditions permit this. Do not place any
other road users in jeopardy.
•When retrospectively mounting a front spoiler, solid wheel hubs
etc. one must ensure that the air supply to the front wheel brakes
is not reduced otherwise the braking system could run too hot.
•Allow for the fact that new brake pads do not achieve their full
braking efficiency until approximately 200 kilometres. New brake
pads must be first “run in” before they develop their optimal fric-
tion force. You can, however, compensate for this slightly reduced
braking force by increasing the pressure on the brake pedal. This
guideline also applies to any new brake pads installed at a future
date.
Caution
•Never allow the brakes to rub by applying slight pressure if you do not
wish to brake the vehicle. This causes the brakes to overheat and can also
result in a longer braking distance and excessive wear.
•Before negotiating a steep downhill section, please reduce your
speed, shift down into the next lower gear (manual gearbox) or select a
lower driving stage (automatic gearbox). This enables you to make full use
of the braking power of the vehicle and reduces the strain on the brakes.
Any additional braking should be done intermittently, not continuously.
Brake booster
The brake booster boosts the pressure which you generate with the brake
pedal. The necessary pressure is only generated when the engine is
running.
WARNING
•Never switch off the engine before the vehicle is stationary.
•The brake booster only operates when the engine is running.
Greater physical effort for braking is required when engine is
switched off. Because if you do not stop as normal, this can cause
an accident and severe injuries.
Antilock brake system (ABS)
ABS prevents the wheels locking when braking.
General
The ABS contributes significantly to enhancing the active safety of your
vehicle. Compared to a car not fitted with the ABS brake system, you are
able to retain optimal steering ability even during a full brake application
on a slippery road surface because the wheels do not lock up.
You must not expect, however, that the braking distance will be shorter
under all circumstances as a result of the ABS. The braking distance for
example on gravel and fresh snow, when you should anyway be driving
slowly and cautiously, will be longer.
s3ec.book Seite 189 Montag, 2. Mai 2005 3:42 15