
The system does not issue a warning when
Rsteering, braking, or accelerating in a
clearly active manner, e.g. when changing
lanes, passing, exiting a highway
Rcutting a narrow curve
Rmaking a very sharp turn
Ra driving safety system such as the ABS,
the BAS, or the ESC has been activated
When setting the turn signal in either
direction, the warning will be suppressed. The
system will issue a warning if a turn signal has
been on for an extended period of time.
GWarning!
The Lane Keeping Assist does not keep the
vehicle in the lane. The Lane Keeping Assist
is only an aid to the driver and may not always
recognize lane markings properly or fail to
recognize them at all.
The system may be impaired or unavailable
when
Rvisibility is poor, e.g. due to snow, rain, fog,
or heavy spray
Roncoming traffic, sun glare or reflection
from other vehicles
Rthe camera area of the windshield is dirty,
foggy, or otherwise obstructed
Rlane markings are not present
Rlane markings are worn, dark, or covered
e.g. by snow or dirt
Rthe distance to the preceding vehicle is too
short
Rwhen lane markings are ambiguous, for
example in road work sections
Rlane markings change rapidly, e.g. on
highway exits or turn-off lanes
Rlanes are narrow and winding
The Lane Keeping Assist cannot take road and
traffic conditions into account. It is the
driver’s responsibility at all times to be
attentive to road, weather and traffic
conditions and to provide the steering,
braking and other driving inputs necessary to
retain control of the vehicle. Failure to do so
could result in recognizing dangers too late,
possibly resulting in an accident and serious
injury to yourself and others.
Switching on or off
Example illustration
XSwitch on or off the Lane Keeping Assist via
the control system (Y page 138).
Lane Keeping Assist indicator : appears
in the multifunction display.
ATTENTION ASSIST
The ATTENTION ASSIST supports you during
long, monotonous rides, e.g. on freeways and
highways. The ATTENTION ASSIST is active at
a vehicle speed of between 50 mph
(80 km/h) and 112 mph (180 km/h). Always
obey applicable speed limits. The
ATTENTION ASSIST suggests to take a rest
when recognizing fatigue or increasing
inattentiveness of the driver.
GWarning!
The ATTENTION ASSIST is only an aid to the
driver. It might not recognize fatigue or
increasing inattentiveness in time or fail to
recognize them at all. The system cannot
substitute a rested and attentive driver.
Fatigue can cause you to recognize dangers
too late, to misjudge potential dangers, or to
react slower. Therefore, make sure to be
rested before and during your trip. Take rests
early enough and regularly, especially during
long trips. Failure to do so could cause you to
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recognize dangers too late which could result
in an accident and serious injury to you and/
or others.
The ATTENTION ASSIST interprets your
fatigue or increasing inattentiveness
considering the following criteria:
Rthe individual driving style, for example the
way you steer
Rthe driving conditions such as time of day
and duration of the ride
The ATTENTION ASSIST function is restricted
and warnings will be delayed or not issued at
all when
Rroad conditions are bad, e.g. heavy bumps
or potholes
Rcrosswinds are strong
Rdriving in a sporty manner with high speed
in curves or rapid acceleration
Rdriving slower than 50 mph (80 km/h) or
faster than 112 mph (180 km/h) most of
the time
Roperating the COMAND or making phone
calls via COMAND
Rchanging lanes or varying the vehicle
speed, i.e. you intervene actively
Warnings and displays in the
multifunction display
Example illustration
XSwitch on the ATTENTION ASSIST via the
control system (Y page 138).
ATTENTION ASSIST indicator : appears in
the multifunction display.
When the ATTENTION ASSIST is active, it will
warn you after 20 minutes of driving at the
earliest. An intermittent warning will then
sound twice and the message Attention
Assist: Time for a rest? appears in the
multifunction display.
XIf possible park your vehicle in a safe
location and take a rest.
XConfirm the message by pressing button
a on the multifunction steering wheel.
If you do not take a rest and the
ATTENTION ASSIST continues to recognize
fatigue or increasing inattentiveness, you will
be warned once more after 15 minutes at the
earliest.
During long trips, take regular and duly rests
that allow you to recover sufficiently.
The ATTENTION ASSIST will be reset and
restarts evaluating the degree of your fatigue
when
Ryou turn off the engine
Ryou release the seat belt and open the
driver’s door, e.g. during a rest or for a
driver change
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Control panels
Dual-zone automatic climate control
USA only
FunctionRecommendation/Notes:Air distribution and
air volume
(automatic mode)
iSwitch on the automatic mode. The
indicator lamp above button à comes
on.
(Y page 186);Front defrosteriKeep this setting selected only until the
windshield and the front door windows are
clear again.
(Y page 189)=ZONE-function on/
off
(Y page 191)?Air recirculationiOnly use this function for a short time,
e.g. in a tunnel. Otherwise, the windows
can fog up due to lack of fresh air.
(Y page 190)AMAX COOL function
on/off
(Y page 190)BA/C cooling on/offiSwitch on/off the air conditioning.(Y page 185)CRear window
defroster
(Y page 191)DClimate control on/
off
iSwitch on/off the climate control
system.
(Y page 185)ETemperature
control, passenger
side
iSet the temperature to 72‡ (22†).(Y page 186)FAir distribution(Y page 189)GAir volume(Y page 189)Climate control system181Controls in detail212_AKB; 2; 41, en-USd2ureepe,Version: 2.11.8.12009-07-17T09:14:21+02:00 - Seite 181Z

FunctionRecommendation/NotesHTemperature
control, driver’s side
iSet the temperature to 72‡ (22†).(Y page 186)IDisplay
Canada only
FunctionRecommendation/Notes:Air recirculationiOnly use this function for a short time,
e.g. in a tunnel. Otherwise, the windows
can fog up due to lack of fresh air.
(Y page 190);Front defrosteriKeep this setting selected only until the
windshield and the front door windows are
clear again.
(Y page 189)=ZONE-function on/
off
(Y page 191)?DisplayAAir distribution and
air volume
(automatic mode)
iSwitch on the automatic mode. The
indicator lamp above button à comes
on.
(Y page 186)BA/C cooling on/offiSwitch on/off the air conditioning.(Y page 185)CRear window
defroster
(Y page 191)DClimate control on/
off
iSwitch on/off the climate control
system.
(Y page 185)ETemperature
control, passenger
side
iSet the temperature to 72‡ (22†).(Y page 186)FAir distribution(Y page 189)182Climate control systemControls in detail
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FunctionRecommendation/NotesGAir volume(Y page 189)HTemperature
control, driver’s side
iSet the temperature to 72‡ (22†).(Y page 186)3-zone automatic climate control
Canada only
FunctionRecommendation/NotesFront climate
control panel
:Air distribution and
air volume
(automatic mode)
iSwitch on the automatic mode. The
indicator lamp in button à comes on.
(Y page 186);Front defrosteriKeep this setting selected only until the
windshield and the front side windows are
clear again.
(Y page 189)=ZONE-function on/
off
(Y page 191)?DisplayAAir recirculationiOnly use this function for a short time,
e.g. in a tunnel. Otherwise, the windows
can fog up due to lack of fresh air.
(Y page 190)Climate control system183Controls in detail212_AKB; 2; 41, en-USd2ureepe,Version: 2.11.8.12009-07-17T09:14:21+02:00 - Seite 183Z

FunctionRecommendation/NotesBResidual heat/
ventilationi With the engine turned off, it is possible
to continue to heat or ventilate the
interior.( Y page 191)CA/C cooling on/offi
Switch on/off the air conditioning.(Y page 185)DRear window
defroster( Y page 191)EClimate control on/
offi Switch on/off the climate control
system.( Y page 185)FTemperature
control, passenger
sidei Set the temperature to 72‡ (22†).(Y page 186)GControls the climate
control
automatically
(FOCUS/MEDIUM/
DIFFUSE)HAir volume( Y page 189)IAir distribution(Y page 189)JTemperature
control, driver’s sidei Set the temperature to 72‡ (22†).(Y page 186)Rear climate
control panelKTemperature
control, raisingi Set the temperature to 72‡ (22†).(Y page 186)LDisplayMIncreasing air
volume( Y page 189)NDecreasing air
volume( Y page 189)OTemperature
control, loweringi Set the temperature to 72‡ (22†).(Y page 186)Notes on climate control system
The climate control system is operational
whenever the engine is running. You canoperate the climate control system in either
the automatic or manual mode. The system
cools or heats the interior depending on the
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The air conditioning uses the refrigerant
R134a. This refrigerant is free of CFCs which
are harmful to the ozone layer.
Deactivating
It is possible to deactivate the air
conditioning. The interior air will then no
longer be cooled or dehumidified.
XPress button ¿.
The indicator lamp above the button goes
out.
The cooling function switches off after a
short delay.
Activating
Moist air can fog up the windows. You can
dehumidify the interior air with the air
conditioning.
XPress button ¿.
The indicator lamp above the button comes
on.
Automatic mode
When operating the climate control system in
automatic mode, the interior air temperature,
air volume and air distribution are adjusted
automatically.
In automatic mode, cooling with
dehumidification is switched on. This function
can be switched off if necessary.
GWarning!
If you deactivate the air conditioning, the
vehicle will not be cooled when weather
conditions are warm. The windows can fog up
more quickly. Window fogging may impair
visibility and endanger you and others.
Dual-zone automatic climate controlXSet the desired temperature
( Y page 186).XActivating: Press button Ã.
The indicator lamp above the button comes
on. The air volume and air distribution are
adjusted automatically.XDeactivating: Press rocker switch F or
G (Y page 181).
or
XPress button ¬ or button Ù (USA
only)
The indicator lamp above button à goes
out.
3-zone automatic climate control
XSet the desired temperature
( Y page 186).XActivating: Press button Ã.
The indicator lamp above the button comes
on. The air volume and air distribution are
adjusted automatically.XPress rocker switch G (Y page 183) up or
down and select the desired level.
The automatic air conditioning settings:
FOCUSAir flow high/air distribution via
the center and side air ventsMEDIUMAir flow medium/air distribution
via the center and side air ventsDIFFUSEAir flow low/air distribution via the
center, side and defroster air ventsXDeactivating: Press rocker switch H or
I (Y page 183).
The indicator lamp above button à goes
out.
Setting temperature
Dual-zone automatic climate control
You can adjust the air temperature on each
side of the passenger compartment. You
should raise or lower the temperature setting
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in small increments, preferably starting at
72‡ (22†).
XIncreasing/decreasing: Press rocker
switch E or H (Y page 181) up or down.
3-zone automatic climate control
You can set the air temperature for each of
the 3 zones separately. You should raise or
lower the temperature setting in small
increments, preferably starting at 72‡
(22†).
Front zones
XIncreasing/decreasing: Press rocker
switch F or J (Y page 183) up or down.
Rear zones
XIncreasing/decreasing: Press rocker
switch F or J (Y page 183) up or down.
Rear climate control
XIncreasing/decreasing: Press button K
or O (Y page 183).
Adjusting air vents
GWarning!
When operating the climate control, the air
that enters the passenger compartment
through the air vents can be very hot or very
cold (depending on the set temperature). This
may cause burns or frostbite to unprotected
skin in the immediate area of the air vents.
Always keep sufficient distance between
unprotected parts of the body and the air
vents. If necessary, use the air distribution
adjustment to direct the air to air vents in the
vehicle interior that are not in the immediate
area of unprotected skin.
For best possible performance of the climate
control:
XKeep the air intake grille in front of the
windshield free of snow, leaves, sticks, and
any other debris.
XAlways keep all air vents and grilles in the
passenger compartment free from
obstruction.
iFor draft-free ventilation, move the
adjustable center and side air vents to the
middle position.
Center air vents
:Left center air vent, adjustable;Right center air vent, adjustable=Thumbwheel for air volume control for
adjustable right center air vent
?Thumbwheel for air volume control for
adjustable left center air vent
XOpening/closing: Turn thumbwheels =
and ? upward or downward.
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