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 transmitted to the road sur-
face is automatically adapted by reducing the engine speed. The system operates
at all speeds.
The TCS operates in combination with the ABS ⇒ page 157,
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 27.
During an intervention of the system, the TCS warning light flashes in the in-
strument cluster ⇒ page 27.
Switching off
You can also switch off the TCS system by pressing the ⇒ fig. 138 button, or, in ve-
hicles with ESP, by pressing the ⇒ fig. 137 button. The TCS warning light 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 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 car free when it has become stuck.
then you should switch on the TCS again.
TCS Off-road
After switching on the Off-road mode ⇒ page 160
, TCS Off-road is activated.
TCS Off-road provides a more effective acceleration of the vehicle on an unfirm
ground, as it allows higher traction between 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 prob-
lem-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 another combi-
nation of tyres and wheels) can influence the function of the TCS ⇒
page 207, Ac-
cessories, changes and replacement of parts.
Active driver-steering recommendation (DSR) This function indicates to the driver in critical situations a steering recommenda-
tion in order to stabilise the vehicle. The active driver-steering recommendation is
activated, for example, on the right and left vehicle side when braking sharply on
different road surfaces. WARNING
Even with this function the vehicle cannot steer itself! The driver is further-
more responsible for the steering of the vehicle!
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 con-
ditions 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. £ 155
Intelligent technology Using the system Safety Driving Tips General Maintenance Breakdown assistance Technical data
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 op-
timal 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.
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 tending to lock. This control cycle is
noticeable 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 optimally control the brake applica-
tion in this braking range. Never interrupt the application of the brakes!
As soon as the vehicle speed has increased to about 20 km/hour an automatic
test procedure is conducted during which you will be able to hear a pumping noise
for about 1 second.
ABS Off-road
After switching on the Off-road mode ⇒ page 160, ABS Off-road is activated.
ABS Off-road increases the braking power of the vehicle on an unfirm ground, as it
keeps the wheels blocked for a longer period of time when the brake is applied
while sliding. The system is only available, if the front wheels are in the straight-
ahead position.
The system operates at speeds of up to 50
km/h. WARNING
● The ABS can also not overcome the physical limits of your vehicle. Please
do not forget this, particularly when driving on icy or wet road surfaces. If the
ABS is operating within the control range, 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 oth-
erwise - risk of an accident!
● The normal braking system is still fully functional if there is an ABS fault.
Visit a specialist garage immediately and adjust your style of driving according
to the damage to the ABS as you will not know how great the damage is and
the limitation it is placing on the braking efficiency. Note
● A warning light comes on if a fault occurs in the ABS system ⇒
page 28.
● Changes to vehicle (e.g. on engine, on the brakes, on chassis or another combi-
nation of tyres and wheels) can influence the function of the ABS ⇒
page 207,
Accessories, changes and replacement of parts.
Brake Assist During a severe brake application (e.g. if a hazard exists), the Brake Assist increa-
ses 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 car to achieve its maximum deceleration and the car 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 ap-
plication. 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 possi-
ble time, which is required for maximum deceleration of the car. You must apply
the brake pedal firmly and hold it in this position in order to achieve the shortest
possible braking distance. £ 157
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The Brake Assist is able to help you achieve a shorter braking distance in emer-
gency 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 153.WARNING
● The Brake Assist is also not able to overcome the physical limits of your car
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 Assist The uphill start assist makes it 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 gradu-
ally 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 assist is active as of a 3 % slope, if the driver door is closed. It is
always active on slopes when in forward or reverse start off. When driving down-
hill, it is inactive.
Electromechanical power steering The 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 en-
gine 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 25. WARNING
Contact your specialist garage if the power steering is defective.
Tyre pressure monitoring system Fig. 139 Button for setting the tyre in-
flation pressure control value
The tyre pressure monitoring 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
in the instrument clus-
ter ⇒ page 28 and an acoustic 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. £158
Intelligent technology
Basic setting of the system
After changing the tyre inflation pressures, after changing one or several wheels,
the position of a wheel on the vehicle (e.g. exchanging the wheels between the
axles) or when the warning light lights up while driving, a basic setting of the sys-
tem must be carried out as follows.
● Inflate all tyres to the specified inflation pressure ⇒ page 201.
● Switch on the ignition.
● Press button
⇒ fig. 139
for more than 2
seconds. While pressing the but-
ton, 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 sig-
nal 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 com-
parison to the stored basic value, 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 manoeuvres. Please stop the vehicle without
delay at the nearest possible stop and inspect the tyres and their inflation
pressures.
● The driver is responsible for the correct tyre inflation pressures. For this
reason, the tyre inflation pressures 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 pressure monitoring system does not take away the responsibility
from the driver for the correct tyre inflation pressure. Note
The tyre pressure monitoring system:
● does not replace the regular tyre inflation pressure control, because the sys-
tem cannot detect an even pressure loss; ●
cannot warn in case of very rapid tyre inflation pressure loss, e.g. in case of
sudden tyre damage. In this case carefully bring the vehicle to a standstill without
sudden steering movements and without sharp braking.
● In order to ensure a proper functioning of the tyre inflation pressure-control
system, it is necessary to carry out the basic setting again every 10 000 km or 1x a
year.
Diesel particle filter (diesel engine) In the diesel particle filter the resulting soot particles are collected
and burnt during the combustion of diesel fuel. Fig. 140 Vehicle data sticker
Code 7GG , 7MB or 7MG on the vehicle data sticker, see ⇒ fig. 140 , indicates that
your vehicle is equipped with a diesel particle filter. The vehicle data sticker is lo-
cated on the floor of the luggage compartment and is also stated in the Service
schedule.
The diesel particle filter filters the soot particles completely from the exhaust. The
soot is collected in the diesel particle filter and burnt regularly. To assist this pro-
cedure, we recommend not to drive regularly over short distances.
If the diesel particle filter is full or there is a fault, it is indicated by the warning
light . £ 159
Intelligent technology Using the system Safety Driving Tips General Maintenance Breakdown assistance Technical data
WARNING
● Driving through water, mud, sludge etc. can reduce the braking power and
extend the braking distance - risk of accident!
● Avoid sudden and severe braking manoeuvres immediately after driving
through bodies of water.
● After driving through bodies of water, the brakes must be cleaned and
dried as soon as possible by intermittent braking. Only apply the brakes for
the purpose of drying and cleaning the brake discs if the traffic conditions per-
mit this. Do not place any other road users in jeopardy. CAUTION
● When driving through bodies of water, parts of the vehicle such as the engine,
gearbox, catalytic converter, chassis or electrics can be severely damaged.
● Oncoming vehicles can generate water waves which can exceed the permissi-
ble water level for your vehicle.
● Potholes, mud or rocks can be hidden under the water making it difficult or im-
possible to drive through the body of water.
● Do not drive through salt water. The salt can lead to corrosion. Immediately
rinse all the parts of the vehicle, which came into contact with the salt water, with
fresh water. Note
After driving through a body of water, we recommend that the vehicle is checked
by a specialist garage.
Off-road driving Important information WARNING
● Never drive too fast, particularly not around curves, and never undertake
extreme driving manoeuvres.
● Always adjust your speed and adapt your style of driving to suit road, off-
road, traffic and weather conditions. WARNING (Continued)
● In case the vehicle is stationary on a hillside at a steep angle, do not exit
the vehicle when it is facing downhill. Through this the overall centre of gravi-
ty can shift in such a way that the vehicle tilts and rolls down the hillside -
hazard! Always carefully exit your vehicle on the side facing uphill
⇒ page 174
.
● A lack of experience and knowledge when driving off-road can lead to criti-
cal situations and serious injuries.
● Never choose a dangerous route and never take a risk which could jeop-
ardize your safety and that of your passengers. If you cannot go on or if you
doubt the safety of the route, turn back and choose another way. Even a ter-
rain, which looks harmless, can be difficult and dangerous, and may bring you
and your passengers into a critical situation.
● If you have not fastened your seat belt correctly or you are not wearing
your seat belt at all, or you are holding the steering wheel incorrectly when
driving off-road, the risk of severe or even fatal injuries increases. Correctly
fastened seat belts reduce serious injuries in case of sudden braking manoeu-
vers and accidents. As long as the vehicle is in motion, always have your seat
belt and those of your passengers correctly fastened. Take your thumbs off
the steering wheel when driving off-road. Should resistance build up in front
of the wheels, the steering wheel may suddenly and unexpectedly spin and
hurt you. Hold the steering wheel with both hands firmly on the outer edge in
the 9 o'clock and 3 o'clock position.
● If you have not fastened your seat belt correctly or you are not wearing
your seat belt at all, or you are holding the steering wheel incorrectly when
driving off-road, the risk of severe or even fatal injuries increases.
● Correctly fastened seat belts reduce serious injuries in case of sudden
braking manoeuvres and accidents. Therefore you and your passengers must
always fasten your seat belts correctly as long as the vehicle is moving.
● Take your thumbs off the steering wheel when driving off-road. If the
wheels hit an obstacle, the steering wheel may suddenly and unexpectedly
spin and hurt you!
● Never use the cruise control system when driving off-road. The use of the
cruise control system when driving off-road is unsuitable and can even be
dangerous.
● Do not drive over embankments, ramps or hillsides at too high a speed.
This can lead to the wheels of the vehicle lifting off the ground so that you
can no longer steer and control the vehicle. £168
Driving and the environment
●
spare wheel and tyre repair kit,
● shovel.
Safe off-road driving Adopt a correct seated position and always fasten the seat belt correctly. Make
sure that your front passenger and your passengers seated on the rear seats al-
ways fasten their seat belts correctly.
When driving off-road, it is perhaps more useful to adopt a slightly different seat-
ed position. Depending on the terrain, an increased 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 visibil-
ity, especially when driving uphill or downhill. You must never be seated in such a
way that the distance between your chest and the middle of the airbag cover is
less than 25 cm ⇒
page 139.
Under no circumstances must you drive off-road with high heels, slippery or open
shoes. You should wear shoes which fit your feet well and allow you to get a feel
for the pedals. WARNING
Observe the important guidelines ⇒
page 168.
Before driving off-road ●
Make sure the tyres are suitable for the planned off-road journey. Before you
drive through difficult terrain, 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 all the tyres and if necessary correct it.
● Check the vehicle tool kit and supplement it according to your needs.
● Fill with engine oil up to the line A , so that the engine is sufficiently supplied
with engine oil when the vehicle is in a tilted position ⇒
page 191, 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 unexpec-
ted situations. Travel together with at least two off-road vehicles. Equipment with
which you can call for help in an emergency is particularly useful.
● Drive slowly through unclear terrain.
● You must stop when encountering difficult passages and explore the continu-
ation 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 disa-
bled.
● 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 vehi-
cle.
● 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 167.
● Keep sufficient distance from other vehicles even at low speeds. When the
first vehicle suddenly gets stuck, the following vehicle can still stop in time with-
out 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 vehicle cannot overcome the physical
limits of your vehicle.
● Be very alert and look ahead when driving off-road. Excessive speed or in-
correct driving manoeuvres can cause damage to the vehicle and lead to seri-
ous injuries.
● Observe the important guidelines ⇒ page 168. £ 171
Driving and the environment Using the system Safety Driving Tips General Maintenance Breakdown assistance Technical data
Exiting the vehicle on a hillside
If the vehicle comes to a standstill at a steep angle on a hillside and you and your
passengers must exit the vehicle, then all the occupants should exit on the side
facing up the hill
⇒
fig. 149 on the right. WARNING
● Never attempt to drive uphill or downhill if it is too steep for your vehicle.
The vehicle could slip, tilt or roll over - risk of accident!
● When driving at an angle on a hillside, the vehicle can lose its grip and
slide sideways. The vehicle can tilt or roll over and then roll down the hillside.
This can lead to serious injuries.
● Always make sure that when the vehicle is at an angle, the wheels on the
low side do not sink deeply into the ground or into troughs and do not drive
over stones, tree stumps or other obstructions with the alternate raised
wheels - risk of accident!
● Before you drive at an angle on a hillside ⇒
fig. 149 , make sure that you can
steer and maintain your trajectory. If this is not possible, choose a different
path. If you drive at an angle on a hillside and there is a risk your vehicle may
tilt, steer immediately downhill on your trajectory and lightly depress the ac-
celerator.
● If the vehicle is stationary on a hillside with a too great angle of lateral in-
clination, avoid sudden and uncontrolled movements in the vehicle. The vehi-
cle can roll over and then roll down the hillside. This can lead to serious inju-
ries.
● If the vehicle is stationary on a hillside with a too great angle of lateral in-
clination, neither you nor your occupants must exit the vehicle through the
doors facing downhill. This can lead to a shift of the overall centre of gravity.
The vehicle can tilt or roll over and then roll down the hillside. This can lead to
serious injuries. To avoid this, you and your occupants must exit the vehicle
only on the side facing uphill ⇒ fig. 149 .
● When you exit the vehicle, make sure that the door which faces uphill does
not close by its own weight or by carelessness - risk of injury!
● Observe the important guidelines ⇒
page 168.
Driving over rutted roads and troughs You will always encounter ruts when driving on forest roads, through wet mead-
ows and fields as well as on rutted stretches of terrain. If the ruts and troughs are on firm and soft ground, you can simply follow the ruts.
Do not drive over ruts and troughs which are too deep. If you cannot avoid this, it
is better that you turn back. CAUTION
If the ruts or troughs become too deep, the underbody of the vehicle can touch
the ground, which might cause the underbody to get damaged. Therefore, avoid
driving in deep ruts and troughs.
Crossing a trench If possible, drive through the trench at an acute angle. Make sure when driving
through the trench that the tilt angle is not too steep.
WARNING
Never attempt to drive through a trench if its embankment is too steep. The
vehicle could slip, tilt or roll over - risk of accident! CAUTION
If you drive into the trench at a right angle, the front wheels will sink into the
trench. There is also the danger that the underbody of the vehicle touches the
ground and is damaged. For these reasons (even with four-wheel drive) it is rarely
possible to get out of the trench.
Driving in sand and mud You should therefore always drive at a constant speed through sand or mud
whenever possible and at the same time do not shift gears or change the driving
stage.
–
Switch on the Off-road mode ⇒ page 160
.
– Select a suitable gear or driving stage and maintain the gear or driving stage.
– Keep your vehicle in constant motion and do not stop until you have reached
firm ground.
Never drive too fast, otherwise the wheels may spin and the vehicle can get stuck.
If you feel that the tyres do no longer grip, then turn the steering wheel quickly
back and forth. This leads to an improved adhesion of the front tyres of the vehi-
cle for a short period of time. £ 175
Driving and the environment Using the system Safety Driving Tips General Maintenance Breakdown assistance Technical data
Driving through sand
Do not reduce
the tyre inflation pressure. If you nevertheless reduce the inflation
pressure, do not forget to re-establish the correct tyre inflation pressure level be-
fore you continue driving. Driving with a reduced tyre inflation pressure increases
the risk that you lose control over your vehicle and that the vehicle rolls over.
Driving through mud
Do not change speed or direction when you drive through the mud. The tyres can
lose their grip in the mud. If the vehicle slides, you must steer in the appropriate
direction in order to regain control over the vehicle. WARNING
● Driving through mud can be dangerous. The vehicle can slide uncontrolla-
bly which causes an increased risk of injury. Adopt a particularly cautious style
of driving. Pay attention to the information and warning notes.
● An incorrect tyre inflation pressure may cause a major or fatal accident! An
incorrect tyre inflation pressure may result in bursting of a tyre, which causes
the vehicle to get out of control.
● Observe the important guidelines ⇒ page 168.
Stuck vehicle If you can no longer drive on ...
–
Carefully dig out all the wheels and make sure that no other parts of the vehi-
cle are stuck in the sand.
– Engage reverse gear.
– Gently depress the accelerator and try to drive backwards in your own track.
– Place scrub, footmats or a sackcloth directly in front of the tyres in order to im-
prove the road adherence and thus achieve an improved traction to drive out.
Rocking out vehicle
– Switch off the TCS ⇒ page 155.
– Set the steering wheel straight.
– Drive so far back until the wheels just begin to spin.
– Quickly shift into first gear and drive forwards until the wheels begin to spin. –
Drive back and forth repeatedly until the momentum is sufficient to free the
vehicle.
– Switch on the TCS.
A few tips
– Ensure that the Off-road mode is switched on ⇒ page 160.
– Avoid prolonged spinning of the wheels, otherwise the vehicle would still sink
deeper into the ground.
– Remove mud, dirt and stones from the tread of the tyre.
You need training and experience if you wish to rock out a vehicle. If you make a
mistake, the vehicle can still sink in further and you can only free it with the help
of others. WARNING
Observe the important guidelines ⇒
page 168.
After driving off-road Check the vehicle for damage after driving off-road - especially on the underside
of the vehicle.
–
Switch off the Off-road mode
⇒
page 160.
– Check the tyres and the axles for damage and remove coarse dirt, stones and
foreign bodies from the tyre tread.
– Clean the turn signal lights, the headlights, the number plate and the win-
dows.
– Check the underbody of the vehicle and remove trapped objects, such as scrub
or wood pieces.
– Contact your specialist garage if you detect any damage.
– In case of thick layers of dirt, clean the radiator grille, the engine compartment
and the underbody of the vehicle. £176
Driving and the environment