Intelligent Technology
165
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 th
e conditions 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 auto- matically adapted by reducing the engine speed. The system operates at all speeds. The TCS operates in combination with the ABS
⇒page 167, “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 instru
ment cluster when there is a fault on the
TCS
⇒page 34.
During an intervention of the system, the TCS warning light
flashes quickly in the
instrument cluster
⇒page 34.
Switching off You can switch the TCS off and on again as yo
u wish. On vehicles fitted with ABS, you
can switch off the TCS by pressing the button
⇒fig. 155
, on vehicles fi
tted with ESP*,
you can switch off the TCS wi
th the aid of the button
⇒page 163, fig. 154
. The TCS
warning light
flashes slowly in the instrument cluster if the system is switched off
⇒ page 34. 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. TCS Off-road* After switching on the Off-road mode
⇒page 170, TCS Off-road is activated.
TCS Off-road provides a more effective a
cceleration of the vehicle on an unfirm
ground, as it allows higher traction be
tween the slipping wheels and the ground.
The system operates when starting off or at low speeds.
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 unde- sirable reduction in the engine output.•
Changes to vehicle (e.g. on engine, on the brakes, on chassis or another combina-
tion of tyres and wheels) can influence the function of the TCS
⇒page 221, “Accesso-
ries, changes and replacement of parts”.
Fig. 155 TCS switch
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Active driver-steering recommendation (DSR)*Vehicles with ESP are equipped 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 activated, for example, on the right and left vehicle si
de when braking sharply on different road
surfaces.
WARNING
Even with this function the vehicle canno
t steer itself! The dr
iver is furthermore
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. Particul
arly 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 coatin
g of ice on them in winter.
Yo u s h o u l d d r y t h e b r a k e s a s
soon as possible 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 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 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 firm
ly 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 possib
le 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 rectifie
d. 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 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 jeop-ardy.•
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 other-wise the braking system could run too hot.•
Allow for the fact that new brake pads
do not achieve their full braking effi-
ciency until approximately 200 kilometres. New brake pads must be first “run in” before they develop their optimal fric
tion force. You can, however, compen-
sate for this slightly reduced braking fo
rce by increasing the pressure on the
brake pedal. This guideline also applie
s to any new brake pads installed at a
future date.
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168
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 poss
ible and adjust your style of driving to
take account of the ABS fault in the meantime since you will not know the extent of the fault and in how far the braking efficiency is affected.
Note
•
A warning light comes on if a fault occurs in the ABS system
⇒page 36.
•
Changes to vehicle (e.g. on engine, on th
e brakes, on chassis or another combina-
tion of tyres and wheels) can in
fluence the function of the ABS
⇒page 221, “Accesso-
ries, changes and replacement of parts”.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 sufficient
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 exists
than during a normal
brake application.
This makes it possible, even with a relative
ly 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 th
e vehicle. You must apply the brake pedal
firmly and hold it in this position 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 163.
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 th
e road surface and to the traffic situ-
ation.•
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 pressure produced by the brake pedal actuation for approx. 2 seconds after releasing the brake pedal. The driver can therefore move his foot from the brake pedal to the accelerator pedal and start off on the slope, without having to actuate the handbrake. 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 3 % slope, if the vehicle door is
closed. It is always 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 less 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.
WARNING (continued)
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Intelligent Technology
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Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
If there is a fault in the power steering, the warning light
or lights up in the instru-
ment cluster
⇒page 32.
WARNING
Contact your specialist
garage if the power steering is defective.
Tyre inflation pressu
re-control system*
The tyre inflation pressure-control system compares with the aid of the ABS sensors the speed and also the rolling circumference of the individual wheels. If the rolling circumference of a wheel is changed, the warning light
lights up in the instrument
cluster
⇒page 35 and an audible signal sounds.
The rolling circumference of the tyre
can change if:•
the tyre inflation pressure is too low,
•
the structure of the tyre is damaged,
•
the vehicle is loaded on one side,
•
the wheels of an axle are loaded heavily (e.g. when towing a trailer or when driving
uphill or downhill),•
snow chains are mounted,
•
the temporary spare wheel is mounted,
•
one wheel per axle was changed.
Basic setting of tyre inflation pressure-control system After changing the tyre inflation pressures or after changing one or several wheels, the position of a wheel on the vehicle (e.g. ex
changing the wheels between the axles) or
when the warning light lights up while drivin
g, a basic setting of the system must be
carried out as follows.•
Inflate all tyres to the specified inflation pressure
⇒page 215.
•
Switch on the ignition.
•
Press button
⇒fig. 156
for more than 2 seconds. While pressing the button,
the warning light
lights up. At the same time the memory of the system is erased
and the new calibration is started, which is confirmed with an audible signal and then the warning light
goes out.
•
If the warning light
does not go out after the basic
setting, there is a fault in the
system. Have the vehicle inspected by your nearest specialist garage. Warning light
lights up
If the tyre inflation pressure of at least one
wheel is insufficiently inflated in comparison
to the stored basic va
lue, the warning light
⇒
lights up.
Warning light
flashes
If the warning light flashes, there is a system fault. Have the vehicle inspected by your nearest specialist garage.
WARNING
•
When the warning light
lights up, immediately reduce the speed and
avoid sudden steering and brake manoeuvr
es. Please stop the vehicle without
delay at the nearest possible stop and in
spect the tyres and their inflation pres-
sures.•
The driver is responsible for the correc
t tyre inflation pressures. For this
reason, the tyre inflation pressu
res must be checked regularly.
•
Under certain circumstances (e.g. sporty style of driving, wintry or unpaved
roads) the warning light
can be delayed or does not light up at all.
•
The tyre inflation pressure-control system does not take away the respon-
sability from the driver for the
correct tyre inflation pressure.
Fig. 156 Button for setting the tyre infla- tion pressure control value
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Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
•
TCS Off-road
⇒page 165,
•
ABS Off-road
⇒page 167.
Switch on Off-road The Off-road mode is switched on by pressing the button
⇒page 170, fig. 158
. The
warning light in the button lights up. The wa
rning light lights up in the instrument
cluster if the system is switched on
⇒page 38.
Switch off Off-road The Off-road mode is switched off by repe
ated pressing of the button. The warning
light in the button goes out. When switching
off the ignition, the Off-road mode is also
switched off and can be switched on again, if necessary, after switching on the ignition. If the engine is switched off by accident an
d restarted within 30 seconds, the Off-road
mode remains switched on. All four wheels must be fitted with the same tyres in order to achieve proper operation of the Off-road mode. Differing rolling circum
ferences of the tyres can lead to an unde-
sirable reduction in the engine output.
WARNING
•
Always adjust your speed to suit weat
her, road and traffic conditions. The
increased safety must not tempt you to take a greater safety risk than otherwise - risk of accident!•
The Off-road equipment can also not overcome the physical limits of your
vehicle.•
The effect of the Off-road equipm
ent depends as well on the tyres.
•
The Off-road equipment
is not designed for the use on common roads.
Start-Off Assist*The Start-Off Assist enhances the driving comfort and can be used when starting off, in particular on a slope. When the vehicle is stationary, the Start-Off Assist is activated after switching it on using the button for the Off-road mode
⇒page 170, fig. 158
.
Operating principle When depressing the accelerator pedal fully, the engine speed required for the start- up procedure of the stationary vehicle is restricted. The overspeed trip unit is automat-ically deactivated after terminating the start-up procedure. As part of the Assist System, the accelerator pedal is adapted in its characteristics for an easier start-off on slippery and loose soil.Downhill Drive Support*Operating principle The Downhill Drive Support maintains a cons
tant speed on a steep downhill section
when driving forwards and backwards by
automatically intervening in the brake
system of all wheels. It prevents the wheels locking because the ABS remains active. The warning light
in the information display of the instrument cluster indicates that
the Downhill Drive Support is available
⇒page 38.
The vehicle speed, which is maintained by the Assist System, is selected by the driver while driving on a downhill section as of the
moment the first intervention of the Assist
System is performed or else, while driving on a downhill section, the driver must control the vehicle speed until the Assist System intervenes for the first time. When the Assist System actively intervenes, this is indicated by the warning light flashing or by a pulsating movement of the brake pedal,
similar to the intervention of the ABS.
The Downhill Drive Support is available in the speed range of 2 km/h up to 30 km/h. If the gear is engaged and the clutch pedal is
not pressed, the lower limit of the idling
speed corresponds to the respective gear which is engaged. You can increase or reduce the speed, even when no gear is engaged, by operating the accelerator or brake pedal. Thus the function
is always interrupted and is reactivated
afterwards. The Downhill Drive Support is activated auto
matically if the following conditions are
met:•
the Off-road mode is switched on and the warning light
lights up in the instru-
ment cluster,•
the engine of the vehicle is running and either the 1st, 2nd, 3rd gear, the reverse
gear or no gear is engaged,•
the speed is less than 30 km/h,
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Driving and the Environment
181
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
WARNING
•
In the event of a vehicle rollover, an occupant of the vehicle who is not
wearing a seat belt is exposed to a clearl
y higher risk of injury compared to an
occupant who is wearing a seat belt.•
Luggage and other items, which are transp
orted on the roof of the vehicle,
additionally raise the centre of gravity and thus increase the risk of a rollover.•
Avoid driving at an
angle on a hillside
⇒page 186.
•
Observe the important guidelines
⇒page 180.
Important informationOff-road driving is not suitable for everyone. Small children, expectant mothers and elderly or physically disabled persons are part
icularly at risk if the ride is rough and
help is far away. The first priority
should always be
safety
.
Never overestimate your own
capabilities and never underestimate the difficulties of
driving off-road. We cannot discuss all the possible driving situations in this manual, because there are so many types of terrains which may hide different risks and dangers. The examples listed in this manual are general rules for
safe off-road driving. It is however not
possible to predict if these rules are valid for all the situations which may occur. Before driving through unknown terrain, it is ther
efore important that you know what lies
ahead of you. This way you can estima
te any possible danger in advance.
For the sake of the environment
When driving off-road, show respect and
appreciation for the environment and its
preservation for future generations.Before driving off-road for the first timeBefore driving off-road, we recommend that
you take part in an Off-road driver
training course. This is especial
l y i m p o r t a n t i f y o u h a v e l i t t l e o r n o e x p e r i e n c e o f d r i v i n g
off-road. In a driver training
course, you learn how to use th
e vehicle in many different
off-road situations and how to handle the
vehicle safely when driving through rough
terrain. Driving off-road requires entirely different skills from the driver and a very different behaviour than driving on the road. Your pers
onal safety and that of your passengers
depend on you, your capabili
ties and your cautiousness.
Do not drive off-road where it is not suitable for your vehicle or where the demands on you are too high. Although your vehicle
can handle off-road driving, it is not
designed for travels with expedition characteristics. Before each journey off-road, make sure th
at the vehicle is appr
opriately equipped for
the planned journey
⇒page 182. The standard equipment of your vehicle may not be
sufficient for your journey. With the standa
rd tyres you can drive with your off-road
vehicle through easy terrain, such as flat forest roads, meadows and fields. Please note however, that driving the vehicle on a diffic
ult, muddy and sandy gr
ound is restricted
and that the traction of the standard tyres is
reduced when driving off-road. If you have
planned prolonged or difficult
off-road trips, we reco
mmend that you equip your
vehicle with suitable off-road tyres.
WARNING
Observe the important guidelines
⇒page 180.
Rules of conduct for responsible off-road drivingObserve the valid national legal requirements when driving off-road.
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Driving and the Environment
182
Explanation of technical termsFig. 163 Embankment angle / slope angle Fig. 164 Ground clearance / ramp angleThe technical data
⇒page 245, “Angle (in degree)” refer to ideal conditions. These
values may differ depending on the load an
d composition of the soil and the environ-
ment. The driver is responsible to decide whether a vehicle can overcome a certain situation. Embankment angle (front and rear) Transition from the horizontal plane to an
upward slope or from a downward slope
back to the plane. The angle indication determines the angle at which you can drive the vehicle down the embankment, at a slow speed, without the bumper or the under-body of the vehicle touching the ground. Slope angle The difference of altitude (upward slope) which is overcome on a stretch of road of 100 m, is indicated in percentage or degrees, i.e. the gradiant at which the vehicle can climb
a hill on its own (among other things, depe
nding on the road surface and the engine
power). Ground clearance The distance between the road surface and the deepest point of the vehicle under- body. Ramp angle The angle indication determines the angle
at which you can driv
e the vehicle over a
ramp, at a slow speed, without the underbody of the vehicle touching the ramp edge.
WARNING
When exceeding the maximum value given in the table
⇒page 245, “Angle (in
degree)”, this can result in serious injuries and/or vehicle damage. All of the data was determined on flat, firm and non-slip road surfaces as well as under dry weather conditions. There are no id
eal off-road conditions. Therefore,
never completely go according to th
e maximum values, but always leave a
safety margin.Useful utensilsMany items can be very useful wh
en driving off-road, for example:
•
compass and maps,
•
torch and spare batteries,
•
mobile phone or CB radio,
•
tow bar or tow rope with sufficient tear strength,
•
electrically driven tyre pump for connect
ing to the 12-volt power outlet of the
vehicle,•
a blanket and rubber boots,
•
snow chains,
•
a timber plank which is approximately 4 cm thick and about 1 metre long can be
used as a traction aid when the vehicle is stuck or as a base for the lifting jack,•
additional tools and a folding
yardstick or a measuring tape,
•
spare wheel and tyre repair kit,
AA
AB
AC
AD
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Driving and the Environment
183
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
•
shovel.
Safe off-road drivingAdopt a correct seated position and always fa
sten the seat belt correctly. Make sure
that your front passenger and your passengers
seated on the rear seats always fasten
their seat belts correctly. When driving off-road, it is perhaps more useful to adopt a slightly different seated position. Depending on the terrain, an incr
eased force may be required to turn the
steering wheel because the force is transferred from the front wheels to the steering wheel. You must be seated in such a way that you have good front visibility, especially when driving uphill or dow
nhill. You must never be seat
ed in such a way that the
distance between your chest and the midd
le of the airbag cover is less than
25 cm
⇒ page 148. Under no circumstances must you drive off-ro
ad with high heels,
slippery or open
shoes. You should wear shoes which fit your fe
et well and allow you to get a feel for the
pedals.
WARNING
Observe the important guidelines
⇒page 180.
Before driving off-road•
Make sure the tyres are suitable for the planned off-road journey. Before you drive
through difficult terrai
n, equip your vehicle with off-road tyres.
•
Fill up your tank. The fuel consumption of
the vehicle is much higher when driving
off-road than when driving on the road.•
Install the towing eye at the front or at the rear before driving off-road. It is not
always possible to install the towing eye if the vehicle got stuck.•
Always check the inflation pressure of a
ll the tyres and if necessary correct it.
•
Check the vehicle tool kit and suppl
ement it according to your needs.
•
Fill with engine oil up to the line , so that the engine is sufficiently supplied with
engine oil when the vehicle is in a tilted position
⇒page 205, “Check engine oil level”.
•
Top up wash fluid.
•
Stow your load as low as possible in the vehicle and attach all the items which are
loose.Off-road driving•
Never be alone when driving off-road and be prepared to encounter unexpected
situations. Travel together with at least two off-road vehicles. Equipment with which you can call for help in an em
ergency is partic
ularly useful.
•
Drive slowly through unclear terrain.
•
You must stop when encountering difficul
t passages and explore the continuation
of the route on foot. If you cannot go on or
if you doubt the safety of the route, turn
back and choose another way.•
Drive slowly over hilltops. Make sure that
the wheels of the vehicle do not lift off
the ground, as this could severely damage
the vehicle and it may become disabled.
•
Drive slowly on difficult stretches of the route. When driving on a slippery ground,
shift up into the next higher gear and make
sure that the vehicle always stays in motion.
Do not drive too fast so that you don't lose control over your vehicle.•
If your vehicle got stuck in
sand, snow or sludge, it may be more effective to reverse
the vehicle than trying to drive forwards.•
Place stones, footmats or pieces of wood
under the spinning wheels in order to
achieve traction on a sandy or slippery ground.•
Do no drive through water before reading what you must take into account
⇒ page 179.•
Keep sufficient distance from other vehicles even at low speeds. When the first
vehicle suddenly gets stuck, the following vehi
cle can still stop in time without getting
stuck itself.•
Do not plan day trips which are too far in distance.
•
Do not use the cruise control system when
driving off-road. It is only intended for
driving on the road.
WARNING
•
The intelligent engineering of your ve
hicle cannot overco
me the physical
limits of your vehicle.
AA
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