
Activation conditions
To activate cruise control, all of the following
activation conditions must be fulfilled:
R the parking brake must be released. The
0066 indicator lamp in the instrument clus-
ter is off
R you are driving faster than 20 mph
(30 km/h)
R neither the brake or clutch pedal is
depressed
i Other 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
operating instructions provided by the
body manufacturer.
Storing and maintaining the current
speed X
Accelerate the vehicle to the desired speed
above 20 mph (30 km/h).
X Briefly push the cruise control lever up 0043
or down 0087.
X Release the accelerator pedal.
Cruise control is activated. The current
speed is stored.
Setting the speed It may be a moment before the vehicle starts
to accelerate or brake to the set speed. Take
this delay into account when setting the
speed.
X Briefly push the cruise control lever up 0043
to increase the speed or down 0087to reduce
the speed.
The last stored speed increases or decrea- ses in 1 mph increments (1 km/h incre-
ments).
or
X Press and hold the cruise control lever
up 0043 or down 0087until the desired speed
has been reached. X
Release the cruise control lever.
The current speed is stored.
i Cruise control is not deactivated if you
depress the accelerator pedal. If you accel- erate briefly to overtake, for example,
cruise control resumes the vehicle’s speed
to the last speed stored after you have fin- ished overtaking.
Deactivating cruise control There are various ways to deactivate cruise
control:
X Briefly press the cruise control lever for-
wards 0085.
or
X Apply the brakes.
The last speed set remains stored. The last
speed stored is deleted when you switch off
the engine.
Cruise control is deactivated automatically
when: R you apply the brakes
R you apply the parking brake and the 0066
indicator lamp in the instrument cluster
lights up
R you are driving slower than 20 mph
(30 km/h)
R you shift the automatic transmission to
neutral position Nwhile the vehicle is in
motion
R ESP ®
or ASR intervenes
R there is a malfunction in the ESP ®
, ASR or
ABS system 160
Driving systemsDriving and parking

radar system only. Removal, tampering, or
altering of the device will void any warran-
ties, and is not permitted by the FCC. Do
not tamper with, alter, or use in any non-
approved way.
Any unauthorized modification to this
device could void the user’s authority to
operate the equipment.
Monitoring range of the sensors
In particular, the detection of obstacles can
be impaired in the case of:
R dirt on the sensors or anything else cover-
ing the sensors
R poor visibility, e.g. due to fog, heavy rain or
snow
R narrow and short vehicles, e.g. motorcy-
cles or bicycles
R very wide lanes
R narrow lanes
R vehicles not driving in the middle of their
lane
R barriers or other road boundaries
Vehicles in the monitoring range are then not
indicated. Blind Spot Assist monitors the area approx-
imately 10 ft (3.0 m)behind your vehicle and
approximately 1.6 ft (0.5 m) to 11.5 ft (3.5 m) each side of it. For this purpose, Blind Spot
Assist uses radar sensors in the rear bumper and behind the protective strips of the B-pil-
lars.
If the lanes are narrow, vehicles driving in the
lane beyond the lane next to your vehicle may
be indicated, especially if the vehicles are not
driving in the middle of their lane. This may be the case if the vehicles are driving on the inner
side of their lane.
Due to the nature of the system:
R a clear warning situation may not occur.
The yellow indicator lamp on the relevant
side of the vehicle will then light up.
R warnings may be issued in error when driv-
ing close to crash barriers or similar solid
lane borders.
R warnings may be interrupted when driving
alongside particularly long vehicles, for
example trucks, for a prolonged time.
The four sensors of Blind Spot Assist are inte-
grated into the rear bumper and behind the
protective strips of the B-pillars. Make sure
that the bumper and protective stripping are
free of dirt, ice or slush in the vicinity of the
sensors. The radar sensors must not be cov-
ered, for example by cycle racks or overhang- ing loads.
Have the function of the radar sensors
checked at a qualified specialist workshop:
R after a severe impact
R after damage to the bumper
R after damage to the protective strips of the
B-pillars
Blind Spot Assist may otherwise not work
properly.
Indicator and warning display
Blind Spot Assist is not active at speeds below approximately 20 mph (30 km/h). Vehicles in the monitoring range are then not indicated. 164
Driving systemsDriving and parking

0043
Yellow indicator lamp/red warning lamp
If yellow indicator lamp 0043lights up:
R you are driving at less than 20 mph
(30 km/h)
R Blind Spot Assist is deactivated
R Blind Spot Assist is malfunctioning
R there is no clear warning, depending on the
situation
Blind Spot Assist is active from a speed of
20 mph (30 km/h). If a vehicle is detected in
the blind spot monitoring range, red warning
lamp 0043on the corresponding side lights up.
This warning occurs when a vehicle enters the blind spot monitoring range from behind or
from the side. When you overtake a vehicle,
the warning only occurs if the difference in
speed is less than 14 mph (22 km/h).
Yellow indicator lamp 0043goes out if reverse
gear is engaged. Blind Spot Assist is then
deactivated.
The brightness of the indicator/warning
lamps is adjusted automatically according to
the ambient light.
Collision warning
If a vehicle is detected in the monitoring range of Blind Spot Assist and you switch on the
corresponding turn signal, a double warning
tone sounds once. Red warning lamp 0043
flashes. If the turn signal remains on, detec-
ted vehicles are indicated by the flashing of
red warning lamp 0043. There are no further
warning tones. Activating/deactivating Blind Spot Assist
i Blind Spot Assist is activated when you
switch on the ignition.
X Turn the key to position 2in the ignition
lock.
Warning lamps 0043in the exterior mirrors
light up red for approximately 1.5 seconds
and then turn yellow.
X To deactivate: press the button in
the center console (Y page 37).
The yellow indicator lamp in exterior mir-
ror 0043first flashes and then lights up con-
tinuously.
X To activate: press the button in the
center console again (Y page 37).
The yellow indicator lamp in exterior mir-
ror 0043flashes initially. If you exceed
20 mph (30 km/h) while driving, the yellow
indicator lamp in exterior mirror 0043goes
out.
Towing a trailer
If you attach a trailer, make sure that you have
correctly established the electrical connec-
tion. This can be accomplished by checking
the trailer lighting. Blind Spot Assist is deac-
tivated as a result. The indicator lamp in the
exterior mirrors lights up yellow.
On vehicles with steering wheel buttons, the
Blind Spot Assist Deactivated
Blind Spot Assist Deactivated mes-
sage also appears in the display.
Lane Keeping Assist General notes
Lane Keeping Assist monitors the area in
front of your vehicle by means of a camera at
the top of the windshield. Lane Keeping Assist detects lane markings on the road and warns you before you leave your lane unintention-
ally. Driving systems
165Driving and parking Z

0043
Lane Keeping Assist camera
Lane Keeping Assist supports you from
speeds of approximately 40 mph(60 km/h).
Important safety notes G
WARNING
Lane Keeping Assist may not always clearly
recognize lane markings.
In this case, Lane Keeping Assist may:
R give an unnecessary warning
R not give a warning
There is a risk of an accident.
Always pay particular attention to the traffic
situation and stay in lane, in particular if
warned by Lane Keeping Assist. G
WARNING
The Lane Keeping Assist warning does not
return the vehicle to the original lane. There is a risk of an accident.
You should always steer, brake or accelerate
yourself, in particular if warned by Lane Keep-ing Assist.
If you fail to adapt your driving style, Lane
Keeping Assist can neither reduce the risk of
accident nor override the laws of physics.
Lane Keeping Assist cannot take into account road, weather or traffic conditions. Lane
Keeping Assist is only an aid. You are respon-
sible for the distance to the vehicle in front,
for vehicle speed, braking in good time and for
staying in your lane.
Lane Keeping Assist does not keep your vehi- cle in its lane. The system may be impaired or may not func-
tion if:
R if the vehicle is incorrectly loaded
(Y page 240)
R there is poor visibility, e.g. due to insuffi-
cient illumination of the road, or due to
snow, rain, fog or spray
R there is glare, e.g. from oncoming traffic,
the sun or reflection from other vehicles
(e.g. if the road surface is wet)
R the windshield is dirty, fogged up, damaged
or covered, for instance by a sticker, in the
vicinity of the camera
R no, or several, unclear lane markings are
present for one lane, e.g. in a construction
area
R the lane markings are worn away, dark or
covered up, e.g. by dirt or snow
R the distance to the vehicle in front is too
small and the lane markings thus cannot be
detected
R the lane markings change quickly, e.g.
lanes branch off, cross one another or
merge
R the road is narrow and winding
R there are highly variable shade conditions
on the road
A warning may be given if a front wheel
passes over a lane marking. In addition, a
warning tone sounds and the 00B0indicator
lamp in the instrument cluster lights up.
Activating/deactivating Lane Keeping
Assist
Lane Keeping Assist is automatically activa-
ted when you start the engine.
X To deactivate: press thejbutton in
the center console (Y page 37).
On vehicles without steering wheel but-
tons:
OFF
OFF flashes briefly in the display and the
00B0 indicator lamp in the instrument clus-
ter flashes and then lights up continuously.
On vehicles with steering wheel but-
tons: 166
Driving systemsDriving and parking

The
Lane Keep. Assist Deactivated
Lane Keep. Assist Deactivated
message appears in the display and the
00B0 indicator lamp in the instrument clus-
ter flashes and then lights up continuously.
Lane Keeping Assist is deactivated.
X To activate: press thejbutton in the
center console again (Y page 37).
On vehicles without steering wheel but-
tons:
ON ON flashes briefly in the display and the
00B0 indicator lamp in the instrument clus-
ter flashes and then goes out.
On vehicles with steering wheel but-
tons:
The Lane Lane Keep.
Keep. Assist
Assist Activated
Activated mes-
sage appears in the display and the 00B0
indicator lamp in the instrument cluster
flashes and then goes out.
Lane Keeping Assist is activated.
A Lane Keeping Assist warning is suppressed if:
R a driving safety system intervenes, such as
ABS, BAS or ESP ®
.
R you have set the turn signal and a lane
change is detected. In this case, the warn-
ings are suppressed for a certain period of
time.
R you accelerate hard, e.g. kickdown on vehi-
cles with an automatic transmission.
R you brake hard.
R you steer actively, e.g. swerve to avoid an
obstacle or change lane quickly.
R you cut the corner on a sharp bend.
In order that you are warned only when nec-
essary and in good time if you cross the lane marking, the system recognizes certain con-
ditions and warns you accordingly.
Lane Keeping Assist warns you earlier if:
R you approach the outer lane marking on a
bend.
R the road has very wide lanes, e.g. a free-
way.
R the system recognizes solid lane markings. Warnings are given later if:
R the road has narrow lanes.
R you cut the corner on a bend. PARKTRONIC
General notes PARKTRONIC is an electronic parking aid. The
system is equipped with ultrasonic sensors inthe front and rear bumpers to monitor the
area around your vehicle. PARKTRONIC indi-
cates visually and audibly the distance
between your vehicle and an object.
Your vehicle features two separate sound
emitters with different frequencies for the
warning tones. The warning ranges in front of
and behind the vehicle are indicated by dif-
ferent warning tones.
PARKTRONIC is activated automatically when you:
R turn the key to position 2in the ignition lock
R release the parking brake and
R move the selector lever to D,Nor R
PARKTRONIC is deactivated at speeds above
11 mph (18 km/h) . PARKTRONIC is reactiva-
ted at speeds below 10 mph (16 km/h).
Important safety notes PARKTRONIC is only an aid. It cannot replace
your own awareness of the immediate sur-
roundings. You are responsible for safe
maneuvering, parking and pulling away. Whenmaneuvering, parking and pulling away, make
sure that there are no persons, animals or
objects in the maneuvering area.
! Pay particular attention to obstacles
above or below the sensors when parking,
such as flower pots or trailer towbars.
PARKTRONIC does not recognize such
objects when they are in the immediate
vicinity of the vehicle. You could damage
the vehicle or objects. Driving systems
167Driving and parking Z

X
Press the 0069button.
If PARKTRONIC is deactivated, the indica-
tor lamp in the switch lights up.
Towing a trailer PARKTRONIC detects a coupled trailer if your
vehicle is equipped with the corresponding
electrical installations for trailer towing.
PARKTRONIC is deactivated for the rear area when you establish an electrical connection
between your vehicle and a trailer. If you use
an adapter for the socket, remove it from the socket after detaching the trailer. Otherwise,
PARKTRONIC remains deactivated for the
rear area.
Remove a detachable trailer coupling if it is no longer required. PARKTRONIC measures the
minimum detection range to an obstacle fromthe bumper, not the ball coupling. 170
Driving systemsDriving and parking

Problems with PARKTRONIC
Problem
Possible causes/consequences and
0050
0050Solutions Only the red segments
in the PARKTRONIC
warning displays are lit.
A warning tone also
sounds for approx-
imately 2 seconds.
PARKTRONIC is deacti-
vated after approx-
imately 20 seconds.
The indicator lamp of
the 0069 button lights
up and the red seg-
ments in the
PARKTRONIC warning
display go out. PARKTRONIC has malfunctioned and has switched itself off.
X If problems persist, have PARKTRONIC checked at a qualified
specialist workshop. The PARKTRONIC
warning displays
implausible distances.
For example, all the
segments may be lit
even though there is no
obstacle present. The PARKTRONIC sensors are dirty or iced up.
X Clean the PARKTRONIC sensors (Y page 268).
X Turn the key to position 2again in the ignition lock. The license plate or other parts attached near the sensors may not
be secured correctly.
X Check the license plate and attachment parts near the sensors
for correct seating. An external radio or ultrasonic source may be causing interfer-
ence.
X Check PARKTRONIC functions in a different location. Rear view camera
Important safety notes !
Objects that are not at ground level
appear further away than they actually are, for example:
R the bumper of the vehicle parked behind
R the drawbar of a trailer
R the ball coupling of a trailer tow hitch
R the tail-end of a truck
R slanted posts Only use the image from the rear view cam-
era as a guide. You may otherwise damageyour vehicle and/or the object.
The rear view camera is only an aid. It cannot
replace your own awareness of the immedi-
ate surroundings. You are responsible for
safe maneuvering, parking and pulling away.
When maneuvering, parking and pulling away, make sure that there are no persons, animals
or objects in the maneuvering area.
The rear view camera is a visual parking aid.
Information on operation can be found in the
separate Audio 15 supplement. Driving systems
171Driving and parking Z

ADR is automatically deactivated if:
R you release the parking brake.
R the brake pedal is depressed.
R the vehicle moves.
R the control unit detects a malfunction.
Setting the working speed X
Activate ADR.
X To increase: press the0091button.
X To decrease: press the0092button. Towing a trailer
Notes on trailer towing
Important safety notes G
WARNING
Installing an unsuitable ball coupling may
result in overloading of the trailer tow hitch
and the rear axle. This applies especially if the ball coupling in question is longer or angled
differently. This could seriously impair the
driving characteristics and the trailer can
come loose. There is a risk of an accident.
You should only ever install a ball coupling
that has the permissible dimensions and that
is designed to meet your trailer-towing
requirements. Do not modify the ball coupling
or the trailer tow hitch. G
WARNING
If you use a ball coupling that is not approved for your vehicle, it may cause excessive strain on the trailer tow hitch. This can cause dam-
age to the vehicle and the trailer may come
loose during the journey. The handling may be
impaired and the rear axle may be overloaded.
This may lead to an accident involving serious
or even fatal injury.
Therefore note the following:
R Only install a ball coupling that is approved
for your vehicle.
R Before the journey, make sure that the ball
coupling is correctly installed and secured.
To do this, observe the operating instruc-
tions of the ball coupling manufacturer.
R Do not make any modifications to the ball
coupling or the trailer tow hitch.
You must observe the operating instructions
of the trailer tow hitch or ball coupling manu-
facturer. G
WARNING
If the ball coupling is not correctly installed
and secured, it could come loose while driving and endanger other road users. There is a risk
of an accident and injury.
Install and secure the ball coupling as descri-
bed in the ball coupling manufacturer's instal- lation instructions. Make sure that the ball
coupling is correctly installed and secured
before every journey. G
WARNING
When the vehicle/trailer combination begins
to lurch, you could lose control of it. The vehi- cle/trailer combination could even rollover.
There is a risk of an accident.
On no account should you attempt to
straighten up the vehicle/trailer combination
by increasing the speed. Reduce vehicle
speed and do not countersteer. Apply the
brake as necessary.
Always observe the operating instructions
provided by the manufacturers of the trailer
coupling and the ball coupling.
Couple and decouple the trailer carefully.
When backing up the towing vehicle, make Towing a trailer
173Driving and parking Z