
Lockable filler cap
Example: DEF filler cap in the engine compartment
XTo open:switch off the ignition.
XOpen the hood (Ypage 218).
XRemove tool ?for unlocking tank filler
cap :from the footwell on the front-
passenger side (
Ypage 240).
XPull cover =up, turn 90° and release.
XInsert tool ?into hole ;of tank filler cap :.
XTurn filler cap:counter-clockwise and
remove it. Make sure that tool ?remains in
tank filler cap :while doing so.
XTo close: replace filler cap :and turn it
clockwise until closed.
XPull tool ?out of tank filler cap :and stow
with the vehicle tool kit in the footwell on the
front-passenger side.
XPull cover =up over hole ;of tank filler
cap :, turn and release.
XTurn tank filler cap :.
If tank filler cap :turns freely, the DEF tank
is closed.
Parking
Important safety notes
GWARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact with
hot parts of the exhaust system or exhaust
gas flow. There is a risk of fire.
Park the vehicle so that no flammable mate-
rials come into contact with parts of the vehi-
cle which are hot. Take particular care not to
park on dry grassland or harvested grain
fields.
GWARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect, for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving.
GWARNING
If you leave children unsupervised in the vehi-
cle, they could set it in motion by, for example:
Rrelease the parking brake.
Rshift the automatic transmission out of the
parking position P.
Rstart the engine.
In addition, they may operate vehicle equip-
ment and become trapped. There is a risk of
an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
!A moving vehicle can lead to damage to the
vehicle or damage to the drive train.
!When the vehicle is parked, always remove
the key to prevent the battery from becoming
discharged.
On vehicles with a battery isolating switch,
switch off the power supply if the vehicle is to
be out of use for a longer period of time.
130Parking
Driving and parking

Rswitch off the electrical system using the bat-
tery main switch (Ypage 118) and
Rdisconnect the vehicle's auxiliary battery
Otherwise, you need to check the battery's con- dition of charge every three weeks, since
standby power consumption can drain the bat-
tery. If the battery voltage is lower than 12.2 V,
the battery must be charged. Otherwise, the
battery may be damaged by exhaustive dis-
charging.
Be sure to observe the notes on disconnecting
and charging the batteries under "Battery"
(
Ypage 227). You can obtain information about
trickle chargers from a qualified specialist work- shop.
If you leave the vehicle parked for longer than
6 weeks, the vehicle may suffer damage as a
result of lack of use. In this event, consult a
qualified specialist workshop.
Driving tips
General notes
Important safety notes
GWARNING
The driver's attention to the road must always be his/her primary focus when driving. For
your safety and the safety of others, we rec-
ommend that you pull over to a safe location
and stop before placing or taking a telephone
call. If you choose to use the telephone while
driving, please use the hands-free device and
only use the telephone when road, weather
and traffic conditions permit.
Some jurisdictions prohibit the driver from
using a mobile phone while driving a vehicle.
Bear in mind that at a speed of just 30 mph
(approximately 50 km/h), your vehicle covers
a distance of 44 feet (approximately 14 m)
ever yse cond.
GWARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect, for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving.
!Always observe the ground clearance of the
vehicle and avoid obstacles. On vehicles with a step, ground clearance is further restricted.
Obstacles can damage the vehicle.
If you must drive over obstacles, drive espe-
cially slowly and carefully. If necessary, have
another person direct you.
Drive sensibly – save fuel
In order to save fuel, observe the following tips:
XThe tires should always be inflated to the rec-
ommended tire pressure.
XRemove unnecessary loads.
XRemove roof carriers when they are not nee-
ded.
XWarm up the engine at low engine speeds.
XAvoid frequent acceleration or braking.
XHave all maintenance work carried out as
indicated by the service intervals in the Main-
tenance Booklet or by the service interval dis-
play.
Fuel consumption also increases when driving in cold weather, in stop-start traffic and in moun-
tainous terrain.
Overrun cutoff
If you are in overrun mode and take your foot off
the accelerator pedal, the fuel supply is cut off
when the engine speed is out of the idle speed
control range.
Drinking and driving
GWARNING
Drinking and driving and/or taking drugs and driving are very dangerous combinations.
Even a small amount of alcohol or drugs can
affect your reflexes, perceptions and judg-
ment.
The possibility of a serious or even fatal acci-
dent are greatly increased when you drink or
take drugs and drive.
Driving tips133
Driving and parking
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erwise, water may enter the vehicle interior or
the engine compartment. This can damage
the electronic components in the engine or
the automatic transmission. Water can also
be drawn in by the engine's air suction nozzles
and this can cause engine damage.
If you have to drive on stretches of road on which
water has collected, please bear in mind that:
Rthe water level of standing water should not
be above the lower edge of the front bumper
Rdo not drive faster than walking speed
Driving in winter
General notes
GWARNING
If you shift down on a slippery road surface in an attempt to increase the engine's braking
effect, the drive wheels could lose their grip.
There is an increased danger of skidding and
accidents.
Do not shift down for additional engine brak-
ing on a slippery road surface.
GDANGER
If the exhaust pipe is blocked or adequate
ventilation is not possible, poisonous gases
such as carbon monoxide (CO) may enter the vehicle. This is the case, e.g. if the vehicle
becomes trapped in snow. There is a risk of
fatal injury.
If you leave the engine or the auxiliary heating
running, make sure the exhaust pipe and area
around the vehicle are clear of snow. To
ensure an adequate supply of fresh air, open a
window on the side of the vehicle that is not
facing into the wind.
Have your vehicle winterproofed at a qualified
specialist workshop in good time at the onset of
winter.
iDo not cover the radiator, e.g. with a winter
cover. The measurements of the on-board
diagnostic system may otherwise return inac-
curate values. Some of these values are
legally prescribed and must therefore always
be exact. Observe the notes in the "Winter operation" sec-
tion (
Ypage 249).
Slippery road surfaces
GWARNING
If you shift down on a slippery road surface in an attempt to increase the engine's braking
effect, the drive wheels could lose their grip.
There is an increased danger of skidding and
accidents.
Do not shift down for additional engine brak-
ing on a slippery road surface.
GWARNING
The outside temperature indicator is not
designed to serve as an ice-warning device
and is therefore unsuitable for that purpose.
Indicated temperatures just above the freez-
ing point do not guarantee that the road sur-
face is free of ice. The road may still be icy,
especially in wooded areas or on bridges.
!Vehicles with automatic transmission may
roll only briefly in the neutral position N. Pro-
longed rolling of the wheels, e.g. when being
towed, will result in transmission damage.
If the vehicle threatens to skid or cannot be
stopped when moving at low speed:
XShift the transmission to neutral position N.
XTry to maintain control of the vehicle using
corrective steering.
Drive particularly carefully on slippery roads.
Avoid sudden acceleration, steering and braking
maneuvers. Do not use cruise control.
You can find further information on winter tires
and snow chains in the "Winter operation" sec-
tion (
Ypage 249).
Driving off-road
Important safety notes
GWARNING
If you drive on a steep incline at an angle or
turn when driving on an incline, the vehicle
Driving tips137
Driving and parking
Z

could slip sideways, tip and rollover. There is arisk of an accident.
Always drive on a steep incline in the line of
fall (straight up or down) and do not turn the
vehicle.
GWARNING
When driving off-road, your body is subject to
forces from all directions, due to the uneven
surface. You could be thrown from your seat,
for instance. There is a risk of injury.
Always wear a seat belt, even when driving off-
road.
GWARNING
If you drive over obstacles or in ruts, the steer-
ing wheel may jerk out of your grip, causing
injury to your hands.
Always hold the steering wheel firmly with
both hands. When driving over obstacles, you
must expect steering forces to increase
briefly and suddenly.
GWARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact with
hot parts of the exhaust system. There is a risk of fire.
When driving off road or on unpaved roads,
check the vehicle's underside regularly. In
particular, remove parts of plants or other
flammable materials which have become
trapped. In the case of damage, contact a
qualified specialist workshop.
!When driving off-road or on unpaved surfa-
ces, check the underside of the vehicle and
the wheels and tires at regular intervals. In
particular, remove any trapped foreign
objects, e.g. stones and branches.
Such foreign objects may:
Rdamage the chassis, the fuel tank or the
brake system
Rcause imbalances and thus vibrations
Rbe flung out when you continue driving
If there is any damage, inform a qualified spe-
cialist workshop. When driving off-road and on construction sites,
sand, mud and water mixed with oil, for exam-
ple, may get into the brakes. This may lead to a
reduction in braking performance or total brake
failure, also as a result of increased wear. The
braking characteristics will vary depending on
the material that has got into the system. Clean
the brakes after driving off-road. If you then
notice reduced braking performance or hear
scraping noises, have the brake system checked
at a
quali
fied specialist workshop. Adjust your
driving style to the changed braking character-
istics.
Driving off-road or on construction sites increa-
ses the possibility of vehicle damage which may
in turn lead to the failure of certain assemblies
and systems. Adapt your driving style to the off- road driving conditions. Drive carefully. Have
any vehicle damage rectified at a qualified spe-
cialist workshop as soon as possible.
When driving on rough terrain, do not shift the
transmission into the neutral position. You could
lose control when attempting to brake the vehi-
cle with the service brake. If your vehicle cannot
manage an uphill slope, drive back down the
slope in reverse gear.
When loading your vehicle for driving off-road or on a construction site, keep the vehicle's center
of gravity as low as possible.
Checklist before driving off-road
XCheck the fuel and DEF levels (Ypage 162)
and top up (Ypage 129).
XEngine: check the oil level (Ypage 220) and
add oil (Ypage 222).
Before driving up or down steep gradients, fill
the oil to the maximum level.
iIf you drive up or down steep gradients, the
4 symbol may appear in the display. The
engine operating safety is not put at risk if you
have filled the engine oil to the maximum level
before the journey.
XVehicle tool kit: check that the jack is work-
ing (Ypage 240).
XMake sure that a lug wrench (Ypage 240),
wooden underlay for the jack, a robust tow
cable and a folding spade are carried in the
vehicle.
XWheels and tires: check the tire tread depth
(Ypage 248) and tire pressure
(Ypage 250).
138Driving tips
Driving and parking

Rules for driving off-road
!Always bear the vehicle's ground clearance
in mind and avoid obstacles, e.g. deep ruts.
Obstacles may damage the following parts of
the vehicle:
Rthe chassis
Rthe drive train
Rthe fuel and supply tanks
For this reason, you should always drive
slowly when driving off-road. If you have to
drive over obstacles, have the front
passenger direct you.
iWe recommend that you additionally carry a
shovel and a recovery rope with shackle in the
vehicle.
REnsure that loads and items of luggage are
securely stowed or lashed down
(
Ypage 212).
RBefore driving off-road, stop the vehicle and
shift to a low gear.
RIf the surface demands it, temporarily deacti-
vate ASR when pulling away (Ypage 53).
ROnly drive off-road with the engine running
and a gear engaged.
RDrive slowly and smoothly. Walking pace is
necessary in many situations.
RAvoid spinning the drive wheels.
RMake sure that the wheels always remain in
contact with the ground.
RDrive with extreme care over unknown terrain
where you can only see for a short distance.
As a precaution, get out of the vehicle to take
a look at the route to be taken in advance.
RCheck the water depth before fording.
RWatch out for obstacles (e.g. rocks, holes,
tree stumps and ruts).
RAvoid edges where the surface could crumble
or break away.
Checklist after driving off-road
!If you detect damage to the vehicle after
driving off-road, have the vehicle checked
immediately at a qualified specialist work-
shop.
Off-road driving places a higher demand on your
vehicle than normal road operation. Check your
vehicle after driving on rough terrain. By doing
so you will notice any damage in good time and reduce the risk of an accident for yourself and
other road users. Clean your vehicle thoroughly
before driving on public roads.
Observe the following points after driving off-
road, on construction sites and before driving on
public roads:
XVehicles with all-wheel drive:
deactivate
all-wheel drive (Ypage 148).
XActivate ASR (Ypage 53).
XClean the headlamps and tail lamps and
check them for damage.
XClean the front and rear license plates.
XClean the windshield, windows and exterior
mirrors.
XClean the steps, door sills and grab handles.
This increases safety of footing.
XClean the wheels and tires, wheel arches and
the underbody of the vehicle with a water jet.
This increases road grip, especially on wet
road surfaces.
XCheck the wheels and tires and wheel arches
for trapped foreign objects and remove them.
Trapped foreign objects can damage the
wheels and tires or may be fl
ung out from the
vehicle when you continue driving.
XCheck the underbody for trapped branches or
other parts of plants and remove them.
Trapped branches or other parts of plants
increase the risk of fire and can cause dam-
age to fuel lines, brake hoses and the rubber
bellows of axle joints and drive shafts.
XClean the brake disks, brake pads and axle
joints, particularly after operation in sand,
mud, grit and gravel, water or similarly dirty
conditions.
XCheck the entire floor assembly, the tires,
wheels, bodywork structure, brakes, steering,
chassis and exhaust system for any damage.
XCheck the service brake for operating safety,
e.g. carry out a brake test.
XIf you notice strong vibrations after driving off-
road, check the wheels and drive train for for-
eign objects again. Remove any foreign
objects which can lead to imbalances and
thus cause vibrations.
Driving tips139
Driving and parking
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Drivingsystems
Cruis econtro l
General notes
Cruise contro lmaintain sth espeed of th evehi-
cl e fo ryou.
Use cruise contro lif road and traffic condition s
mak eit appropriat eto maintain asteady speed
fo r a prolonged period. You can set any speed
from 20 mph upwards in increment sof 1mph .
iIf you hav eset km/h as th euni tfo rth edig-
ital speedometer (Ypage 170), you can set
any speed from 30 km/h upwards in incre-
ments of 1km/h.
Cruise contro lshould no tbe activated when
drivin goff-road or on construction sites.
Cruise contro lmay no tbe able to maintain th e
stored speed on uphill or downhill gradients. If
th egradient evens out and th evehicle' sspeed
doe sno tfall belo w20 mph (30 km/ h), the
stored speed is resumed.
iThe speed shown in the speedometer may
differ slightly from the speed stored by cruise
control.
Important safety notes
If you fail to adapt your driving style or if you are inattentive, cruise control can neither reduce
the risk of an accident nor override the laws of
physics. Cruise control cannot take road,
weather and traffic conditions into account.
Cruise control is only an aid. You are responsible
for the distance to the vehicle in front, for vehi-
cle speed, for braking in good time and for stay-
ing in lane.
Do not use cruise control:
Rin traffic conditions that are unsuitable for
driving at a constant speed, e.g. in heavy traf-
fic, on winding roads or off-road.
Ron slippery roads. Braking or accelerating
may cause the drive wheels to lose traction
and the vehicle could then skid.
Rwhen there is poor visibility, e.g. due to fog,
heavy rain or snow.
If there is a change of drivers, make sure that
you inform the new driver about the set cruise
speed.
Cruise control lever
Operating cruise control
:To activate and store the current speed or a
higher speed
;To activate at the last stored speed
=To activate and store the current speed or a
lower speed
?To deactivate cruise control
The cruise control lever is the upper lever on the
left of the steering column.
Displaying the cruise control speed
Vehicles with steering wheel buttons: when
you activate cruise control, the text field in the
display briefly shows the speed
limitmessage
and the stored speed. The status area of the
display then shows the Vsymbol and the
stored speed.
Vehicles without steering wheel buttons:
when you activate cruise control, the display
briefly shows the Vsymbol and the stored
speed.
Activation conditions
To activate cruise control, all of the following
activation conditions must be fulfilled:
Rthe parking brake must be released. The c
indicator lamp in the instrument cluster is off
Ryou are driving faster than 20 mph (30 km/h)
Rneither the brake or clutch pedal is depressed
iOther drive and brake systems not descri-
bed in this Operator's Manual, such as a
retarder, may affect cruise control. You can
find information on this in the separate oper-
ating instructions provided by the body man-
ufacturer.
140Driving systems
Driving and parking

Problems with cruise control
ProblemPossible causes/consequences andMSolutions
On vehicles with steering
wheel buttons, the
speed cannot be set
when cruise control is
activated.The display shows a high-priority message. Thus a change in speed is
not possible.
XProceed as instructed by the message in the display.
XDeactivate cruise control
COLLISION PREVENTION ASSIST
General notes
COLLISION PREVENTION ASSIST comprises the
distance warning function and adaptive Brake
Assist.
Distance warning function
Important safety notes
iNote the section on 'Important safety notes'
(Ypage 52).
GWARNING
The distance warning function does not react:
Rto people or animals
Rto oncoming vehicles
Rto crossing traffic
Rwhen cornering
Thus, the distance warning function cannot
provide a warning in all critical situations.
There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
GWARNING
The distance warning function cannot always
clearly identify objects and complex traffic
situations.
In such cases, the distance warning function
may:
Rgive an unnecessary warning
Rnot give a warning
There is a risk of an accident.
Always pay careful attention to the traffic sit- uation and do not rely solely on the distance
warning function.
Operation
The distance warning function can help you to
minimize the risk of a front-end collision with a
vehicle ahead or reduce the effects of such a
collision. If the distance warning function
detects that there is a risk of a collision, you will
be warned visually and acoustically. Without
your intervention, the distance warning function
cannot prevent a collision.
The distance warning function will issue a warn-
ing at speeds of around 20 mph (30 km/h) or
more if:
Ryou approach a vehicle ahead of you very
quickly. You will then hear an intermittent
warning tone and the red ·warning lamp
in the instrument cluster flashes.
XBrake immediately in order to increase the
distance from the vehicle in front.
or
XTake evasive action provided it is safe to do
so.
If you want the distance warning function to
assist you, the function must be activated and
operational.
Due to the nature of the system, particularly
complicated driving conditions may cause the
system to display an unnecessary warning.
With the help of the radar sensor system, the
distance warning function can detect obstacles
that are in the path of your vehicle for an exten-
ded period of time.
Up to a speed of around 45 mph (70 km/h), the
distance warning function can also react to sta-
tionary obstacles, such as stopped or parked
vehicles.
142Driving systems
Driving and parking

If you approach an obstacle and the distance
warning function detects a risk of a collision, the
system will alert you both visually and acousti-
cally.
In particular, the detection of obstacles can be
impaired in the case of:
Rdirt on the sensors or anything else covering
the sensors
Rsnow or heavy rain
Rinterference from other radar sources
Rthere are strong radar reflections, for exam-
ple in parking garages
Ra narrow vehicle traveling in front, e.g. a
motorbike
Ra vehicle traveling in front on a different line
Following damage to the front end of the vehicle,
have the configuration and operation of the
radar sensor checked at a qualified specialist
workshop. This also applies to collisions at slow
speeds where there is no visible damage to the
front of the vehicle.
Activating/deactivating the distance
warning function
When you switch on the engine, the distance
warning function switches on after a few sec-
onds.
XTo deactivate: press theæbutton
(Ypage 35).
Vehicles without steering wheel buttons:
the Ä warning lamp in the instrument clus-
ter lights up and the OFF
message flashes. The
message then disappears and the Äindi-
cator lamp remains lit.
Vehicles with steering wheel buttons: the
Ä warning lamp in the instrument cluster
flashes and the Distance
warningsystemdeactivatedmessage appears .The mes-
sage then disappears and the Äwarning
lamp remains lit.
XTo activate: press theæbutton again
(Ypage 35).
Vehicles without steering wheel buttons:
the Ä warning lamp in the instrument clus-
ter lights up and the on
message flashes. The
message then disappears and the Äindi-
cator lamp goes out.
Vehicles with steering wheel buttons: the
Ä warning lamp in the instrument cluster
flashes and the Distance
warningsystemactivatedmessage appears in the multi- function display. The message then disap-
pears and the indicator lamp
Ägoes out.
Adaptive Brake Assist
iObserve the "Important safety notes" sec-
tion for driving safety systems (Ypage 52).
GWARNING
Adaptive Brake Assist cannot always clearly
identify objects and complex traffic situa-
tions.
In such cases, Adaptive Brake Assist can:
Rintervene unnecessarily
Rnot intervene
There is a risk of an accident.
Always pay careful attention to the traffic sit- uation and be ready to brake. Terminate the
intervention in a non-critical driving situation.
GWARNING
Adaptive Brake Assist does not react:
Rto people or animals
Rto oncoming vehicles
Rto crossing traffic
Rto stationary obstacles
Rwhen cornering
As a result, the Adaptive Brake Assist may not
intervene in all critical conditions. There is a
risk of an accident.
Always pay careful attention to the traffic sit- uation and be ready to brake.
Adaptive Brake Assist aids you when braking
during hazardous situations at speeds above
20 mph (30 km/h). With the help of Adaptive
Brake Assist, the distance warning signal can
detect obstacles that are in the path of your
vehicle for an extended period of time.
When you approach an obstacle and adaptive
Brake Assist detects that there is a risk of a col- lision, adaptive Brake Assist calculates the brak-
ing force necessary to avoid a collision. Should
you apply the brakes forcefully, adaptive Brake
Assist will automatically increase the braking
force to the calculated level.
Driving systems143
Driving and parking
Z