Passive Safety
166
Manual front passenger adjustment
⇒page 12, “Adjusting the front seats”.
Electrical front passenger seat adjustment
⇒page 76, “Adjusting front seats electri-
cally*”.
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 footwel
l when the vehicle 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 fata
l 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 th
e seat belts and of the airbag system -
risk of injury!Correct seated position for the occupants on the rear seats Occupants on the rear seats must sit upright, keep the feet in the footwell and must have their se
at belts correctly fastened.
To reduce the risk of injury in the event of a sudden braking manoeuvre or an acci- dent, 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 165, fig. 168
.
•
Fasten the seat belt correctly
⇒page 170, “How are seat belts correctly
fastened?”.
•
If you are transporting
⇒page 184, “Transporting children safely” children 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 occupants.•
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 accident. 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 incorrec
t 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 on
ly if the webbing of the seat belts is
properly routed. Incorrect seated positio
ns considerably reduce the protective
functions of the seat belts and therefore incr
ease the risk of injury due to an incor-
rect routing of the seat belt. The driver is fully responsible for himself and the occu-pants, in particular for the children. Do
not permit an occupant to adopt an incor-
rect 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 comple
te, however we would like you to get inter-
ested 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,
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Seat belts
171
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
– Slowly pull the belt webbing at the to
ngue of the lock over your chest
and pelvis
⇒
.
– Insert the tongue of the lock into th
e 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 middl
e 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
⇒page 170,
fig. 172
. 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
⇒page 170, fig. 173
.
•
Always ensure that the webbing of the
seat belts is properly routed. Seat
belts which are not correctly adjusted ca
n themselves cause injuries even in
minor accidents.•
A seat belt which is hanging too loose can result in injuries as your body
is moved forward by the kinetic energy produced in an accident and is then suddenly held firm by the belt.•
Only insert the lock tongue into the lo
ck which is the correct one for your
seat. This will affect the protection whic
h the belt offers and increase the risk
of an injury.
Seat belt height adjusterThe seat belt height adjuster makes it possible for you to adapt the routing of the three-point seat belt in
the area of the shoulder to match
your body size. – Move the height adjuster in the desired direction up or down
⇒
fig. 174
.
– Then pull firmly on the belt to ensure
that the seat belt height adjuster
has correctly locked in place.
WARNING
Adjust the height of the belt in such a way that the shoulder part of the belt is positioned approximately across the middle of your shoulder - on no account across your neck.
Note
It is also possible to adapt the routing
of the belt webbing at the front seats by
adjusting the height of the seat.
Fig. 174 Front seat: Seat belt height adjuster
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Intelligent Technology
193
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
Driving TipsIntelligent TechnologyElectronic stability programme (ESP)*GeneralGeneral The ESP aids you maintain control of your vehicle in situations in borderline driving situations such as when negotiating a curve too fast. The risk of skidding is reduced and your vehicle 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),
•
Active driver-steering recommendation (DSR),
•
Antilock brake system (ABS),
•
Brake Assist,
•
Uphill-Start off-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 individual systems. It also processes additional measurement data which are supplied by highly sensitive sensors: the rotational velocity of the vehi
cle about its vertical axis, the lateral accel-
eration of the vehicle, the brakin
g pressure and the steering angle.
The direction which the driver wishes to ta
ke 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 exis
t, such as the vehicle 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 re
ar wheel of a vehicle which tends to under-
steer (tendency to shift out of the curve). This braking control cycle is accompanied by noises. The ESP operates in combination with the ABS
⇒page 197, “Antilock brake system
(ABS)”. If there is a fault in the ABS system, the ESP also does not operate. The ESP warning light lights up in the instru
ment cluster when there is a fault on the
ESP
⇒page 37.
Switching off You can switch the ESP off and on again
as you wish, by pressing the button
⇒ fig. 196
. The ESP warning light lights up in th
e instrument cluster when the ESP is
switched off
⇒page 37.
The ESP should normally always be switched
on. It may be good practice in certain
exceptional cases, such as when you wish
to have wheel slip, to switch off the
system. Examples:
Fig. 196 ESP switch
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Intelligent Technology
194
•
when driving with snow chains
•
when driving in deep snow or on a loose surface
•
when it is necessary to rock a vehicle when it has become stuck.
then you should switch on the ESP again.
WARNING
It is also not possible for the ESP 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 other- wise - 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 assign-
ment of tyres and wheels) can influence the function of the ESP
⇒page 244,
“Accessories, changes and replacement of parts”.Electronic Differential Lock (EDL)* The electronic differential lock pr
events an individual wheel from
slipping.Models fitted with ESP are equipped with electronic differential lock (EDL). General The EDL makes it much easier, and sometimes at all possible, to start off, accelerate and climb a steep hill when the conditio
ns 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 proces
s 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 driv
en and has the same characteristics as a
vehicle not fitted with EDL. The EDL switches on again
automatically as soon as the brake has cooled down.
WARNING
•
Carefully depress the accelerator when accelerating on uniformly slip-
pery road surfaces, such as ice and sn
ow. 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 or ESP warning light comes on,
this may also indicate a fault in the
EDL. Please have the vehicle inspected as soon as possible by a specialist garage.•
Changes to vehicle (e.g. on engine, on
the brakes, on chassis or other assign-
ment of tyres and wheels) can in
fluence the function of the EDL
⇒page 244,
“Accessories, changes and
replacement of parts”.
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Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
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 conditio
ns of the road surface are unfavourable.
Operating principle The TCS switches on automatically when th
e 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 transmitted to the road surface is automatically adapted by redu
cing the engine speed. Th
is occurs at all speeds.
The TCS operates in combination with the ABS
⇒page 197, “Antilock brake system
(ABS)”. The TCS will not function if a fault exists in the ABS system. The TCS warning light lights up in the instrument cluster when there is a fault on the TCS
⇒page 37.
Switching off You can switch the TCS off and on again
as you wish by pressing the button
⇒ fig. 197
. The TCS warning light lights up in the instrument cluster when the TCS is
switched off
⇒page 37.
The TCS should normally always be switched on. It may be good practice in certain exceptional cases, such as when you wish
to have wheel slip, to switch off the
system. Examples:•
when driving with snow chains
•
when driving in deep snow or on a loose surface
•
when it is necessary to rock a vehicle when it has become stuck.
then you should switch on the TCS again.
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 assign-
ment of tyres and wheels) can in
fluence the function of the TCS
⇒page 244,
“Accessories, changes and replacement of parts”.Active driver-steering recommendation (DSR)*Vehicles with ESP are equi
pped with active driver-steering recommendation (DSR).
This function indicates to the driver in critical situations a steering recommendation in order to stabilise the vehicle. The active driver-steering recommendation is acti-vated, for example, on the right and left
vehicle side when
braking sharply on
different road surfaces.
Fig. 197 TCS switch
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Intelligent Technology
196
WARNING
Even with this function the vehicle ca
nnot steer itself! The
driver is further-
more responsible for the steering of the vehicle!BrakesWhat 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 neces-
sary 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 br
akes take full effect under certain condi-
tions 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 possib
le by applying and releasing the brakes
several times. There also may be a certain delay before the
full braking efficiency is available when
driving on roads which have been treated wi
th road salt if yo
u have not used the
brakes for some considerable time beforeha
nd. The layer of salt on the brake discs
and brake pads must first be rubb
ed off when you apply the brakes.
Corrosion Corrosion on the brake discs and dirt on th
e 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 corro- sion 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. 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 40, “Brake system
”.
WARNING
•
Only apply the brakes for the purpos
e 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 sy
stem could run too hot.
•
Allow for the fact that new brake pads
do not achieve th
eir full braking
efficiency until approximately 200 kilo
metres. New brake pads must be first
“run in” before they develop their optimal friction force. You can, however, compensate for this slightly reduced
braking force by increasing the pres-
sure on the brake pedal. This guidelin
e also applies to any new brake pads
installed at a future date.
Caution
•
Never allow the brakes to ru
b by applying slig
ht 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 sect
ion, please reduce your speed, shift
down into the next lower gear (manual ge
arbox) or select a lower driving stage
(automatic gearbox). This enables you to make full use of the braking power of the
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Intelligent Technology
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Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
vehicle and reduces the strain on the brakes
. Any additional braking should be done
intermittently, no
t continuously.
Note
The brake light flashes automa
tically in case of an em
ergency braking at speeds
g re a t e r t h a n 6 0 k m /h o r w i t h t he i n t e r v e n t i o n o f th e A BS , w h i ch l a s t s l o n g e r th a n 1 .5 seconds. After the speed was reduced belo
w 10 km/h or the vehicle was stopped,
the brake light stops flashing and the hazard warning light system switches on. The hazard warning light system is switched
off automatically after accelerating or
driving off again.Brake boosterThe brake booster boosts the pressure which you generate with the brake pedal. The necessary pressure is only gene
rated 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 significan
tly to enhancing the active
safety of your vehicle.
Compared to a vehicle not fitted with the ABS brake system, you are able to retain optimal steering ability even during a fu
ll brake application on a slippery road
surface because the wheels do not lock up. You must not expect, however, that the br
aking distance will be shorter under all
circumstances as a result of the ABS. Th
e braking distance for example on gravel
and fresh snow, when you should anyway be driving slowly and cautiously, will be longer. Operating principle The brake pressure will be reduced on a wheel which is rotating at a speed which is too low for the speed of the vehicle and tend
ing to lock. This control cycle is notice-
able from a
pulsating movement of the brake pedal
which is accompanied by
noises. This is consciously intended to provide the driver with the information that the wheels are tending to lock (ABS control range). You must always keep the brake pedal depressed to enable the ABS to optima
lly control the brake application in this
braking range. Never interrupt the application of the brakes!
WARNING
•
The ABS can also not overcome the physic
al limits of your vehicle. Please
do not forget this, particularly when driv
ing on icy or wet road surfaces. If the
ABS is operating within the control ra
nge, adapt your speed immediately to
the conditions of the road surface and the traffic situation. The increased safety offered by the ABS must not tempt you to take greater risks than otherwise - risk of an accident!•
The normal braking system is still fully
functional if there is an ABS fault.
Visit a specialist garage as quickly as po
ssible and adjust yo
ur style of driving
to take account of the ABS fault in the meantime since you will not know how great the damage is.
Note
•
A warning light comes on if a fault occurs in the ABS system
⇒page 38.
•
Changes to vehicle (e.g. on engine, on the brakes, on chassis or other assign-
ment of tyres and wheels) can in
fluence the function of the ABS
⇒page 244,
“Accessories, changes and replacement of parts”.
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198
Brake Assist*During a severe brake application (e.g. if a hazard exists), the Brake Assist increases the braking force and thus makes it possible to rapidly produce the pressure required in the brake system. The majority of drivers do
apply the brakes in good time in dangerous situations,
but do not depress the brake pedal with su
fficient pressure. Consequently, it is not
possible for the vehicle to achieve its maximum deceleration and the vehicle covers a greater distance than necessary. The Brake Assist is activated by the very quick operation of the brake pedal. In such cases, a much greater braking pressure ex
ists than during a normal brake applica-
tion. This makes it possible, even with a relatively low resistance of the brake pedal, to produce an adequate pressure in the brake system in the shortest possible time, which is required for maximum deceleration of the vehicle. You must apply the brake pedal firmly and hold it in this po
sition in order to achieve the shortest
possible braking distance. The Brake Assist is able to help you achieve a shorter braking distance in emergency situations by rapidly producing the pressure
required in the brake system. It fully
exploits the attributes of the ABS. After you release the brake pedal, the function of the Brake Assist is automatically switched off and the brakes operate in the normal way. The Brake Assist is part of the ESP system. If a fault occurs in the ESP, the Brake Assist function is also not available.
Further information on the ESP
⇒page 193.
WARNING
•
The Brake Assist is also not able to overcome the physical limits of your
vehicle in terms of the braking distance required.•
Adapt your speed to the conditions of the road surface and to the traffic
situation.•
The increased safety offered by the Brake Assist must not tempt you to
take a greater safety risk than otherwise.
Uphill-Start
off-Assist*
The uphill-start off-assist makes it much easier to start off on steep hills. The system assists a start off by holding the brake pr
essure produced by the brake pedal actu-
ation for approx. 2 seconds after releasing the brake pedal. The driver can therefore move his foot from the brake pedal to th
e accelerator pedal and start off on the
slope, without having to actuate the hand
brake. The brake pressure drops gradually
the more you operate the accelerator pedal. If the vehicle does not start off within 2 seconds, it starts to roll back. The uphill-start off-assist is active in the ev
ent of a 5% slope, if the vehicle door is
closed. It is alwa
ys active on slopes when in forward or reverse start off. When
driving downhill, it is inactive.Electromechanical power steeringThe power steering enables you to steer
the vehicle with le
ss physical force.
With the electromechanical power steering, the steering assist is automatically adapted to the speed and to the steering angle. It is still possible to fully steer the vehicle if the power steering fails or if the engine is not running (vehicle being towed in). The
only difference is that greater physical
effort is required. If there is a fault in the power steering, the warning light
or lights up in the
instrument cluster
⇒page 35.
WARNING
Contact your specialist
garage if the power steering is defective.
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