MERCEDES-BENZ R320 2010 W251 Owner's Manual

R
Front area: An intermittent acoustic
warning lasting a maximum of 2 seconds
will sound as the first red distance segment
illuminates. A constant acoustic warning
lasting a maximum of 2 seconds will sound
for the second red distance segment. The
signal is canceled when the automatic
transmission is shifted into park
position P or the parking brake is engaged.
R Rear area: An intermittent acoustic
warning lasting a maximum of 2 seconds
will sound as the first red distance segment
illuminates. A constant acoustic warning
lasting a maximum of 2 seconds will sound
for the second red distance segment. The
signal is canceled when the automatic
transmission is shifted into drive
position D, or park position P, or the
parking brake is engaged.
Switching the Parktronic system on/
off The Parktronic system switches on
automatically when the ignition is switched
on.
X
Switching off: Press Parktronic
switch :.
Indicator lamp ; comes on.
X Switching on: Press Parktronic switch :
again. Trailer towing The rear Parktronic sensors will be
deactivated when you have established the
electrical connection between your vehicle
and the trailer you are about to tow.
!
The distance between the sensors in the
bumpers and an obstacle is referred to as
the minimum range of the Parktronic. A
trailer hitch will reduce the distance to an
obstacle. Keep this in mind to avoid any
damage.
Parktronic system malfunction There is a malfunction in the Parktronic
system, if only the red distance segments
illuminate and an acoustic warning sounds.
The Parktronic system will switch off
automatically after 20 seconds and indicator
lamp
; in Parktronic switch : comes on.
X Have the Parktronic system checked at an
authorized Mercedes-Benz Center as soon
as possible.
If only the red distance segments illuminate
and no acoustic warning sounds, the
Parktronic system sensors are dirty (e.g. dirt,
ice, snow and slush). Another cause could be
interference from other radio or ultrasonic
signals (e.g. truck air brakes, car wash, or
jackhammers). The Parktronic system will
switch off automatically after 20 seconds and
indicator lamp ; in Parktronic switch :
comes on.
X Switch off the ignition.
X Clean the Parktronic system sensors
(Y page 265).
X Switch on the ignition.
or
X Check the Parktronic system operation at
another location to rule out interference
from outside radio or ultrasonic signals. Rear view camera
The rear view camera is an optical parking aid. Driving systems
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The area behind the vehicle appears in the
COMAND system display as a mirror image,
like in the rear view mirror.
In addition, the rear view camera contains
guidelines to help you with driving in reverse.
G
Warning!
Make sure no persons or animals are in or
near the area in which you are parking/
maneuvering. Otherwise, they could be
injured. G
Warning!
The rear view camera is only an aid and may
display obstacles
R from a distorted perspective
R inaccurately
R may not display obstacles at all
The rear view camera does not relieve you of
the responsibility to be cautious. Take care
and pay careful attention. The rear view
camera may not show objects which are
R very close to the rear bumper
R under the rear bumper
R above the tailgate handle
You are responsible for safety at all times and
must continue to pay attention to the
immediate surroundings when parking and
maneuvering. This includes the area behind,
in front of, and beside the vehicle. Otherwise
you could endanger yourself and/or others. G
Warning!
The rear view camera either will not function
or will not function to its full capability if
R the tailgate is open
R it is raining very hard, snowing or foggy
R it is night or you are parking/maneuvering
your vehicle in an area where it is very dark
R the camera is exposed to a very bright white
light R
the immediate surroundings are
illuminated with fluorescent light (the
display may flicker)
R there is a sudden change in temperature,
e.g. if you drive into a heated garage from
the cold (lens condensation)
R the camera lens is dirty or covered
R the rear of your vehicle is damaged
In this case, have the position and setting
of the camera checked by a qualified
specialist workshop. Mercedes-Benz
recommends that you contact a Mercedes-
Benz Center for this purpose.
Do not use the rear view camera in these
situations. Otherwise you could injure
yourself or others and/or damage property
including your vehicle while parking/
maneuvering. G
Warning!
Use of rear view camera can be dangerous if
you are color-blind or have impaired color
vision.
Only use rear view camera if you can see and
distinguish all colored guidelines shown by
rear view camera on the COMAND system
display. Camera lens
: must be free of dirt, ice,
snow, and slush to function properly. Clean
the camera lens regularly. Being careful not
to scratch or damage the camera lens, see
“Cleaning the rear view camera lens”
(Y page 266). 160
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Switching on/off
X
Switching on: Switch on the ignition.
X Switch on the COMAND system.
X Shift the automatic transmission to reverse
gear R.
The COMAND system display will show the
area behind the vehicle with guidelines. G
Warning!
Please note that objects which do not touch
the ground may appear to be further away
than they actually are, for example:
R the bumper of a vehicle parked behind you
R a trailer hitch
R the back of a truck
In such cases, you should not use the
guidelines to judge the distance. You may
misjudge the distance which increases the
risk of impacting the objects.
Even when the object you approach is directly
on the ground do not approach the object any
closer than the red guideline. Red guideline
= indicates an approximate
distance of 10 in (0.25 m) from the rear of the
vehicle. Yellow guidelines ; indicate an
approximate distance of 3 ft (1 m) from the
rear of the vehicle. Blue guidelines :
indicate the approximate width required for
the vehicle.
i The image from the rear view camera will
no longer be displayed if you select another
function on the COMAND system while
reverse gear R is engaged. To display the
image again, disengage and reengage
reverse gear R.
X Switching off: Shift the automatic
transmission into park position P, neutral
position N, or drive position D. Driving systems
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Overview of climate control system functions and air vents
Your vehicle is equipped with either of the following climate control systems: Climate control
(Y page 164) 3-zone automatic climate control
USA only
(Y page 170) Canada only (Y page 172)
The climate control combines an automatic
heating and ventilation system with a cooling
system. You can adjust the automatic
climate control separately for the driver’s
and passenger side. The 3-zone automatic climate control
combines an automatic heating and
ventilation system with a cooling system.
You can adjust the 3-zone automatic climate
control separately for each zone in the
vehicle.
Rear automatic climate
control
(Y page 174) The rear automatic climate control allows
separate climate settings for the rear
compartment. Air vents
G
Warning!
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. 162
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For best possible performance of the climate
control:
X
Keep the air intake grille in front of the
windshield free of snow, leaves, sticks, and
any other debris.
X Always keep all air vents and grilles in the
passenger compartment free from
obstruction.
i For 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
X Opening/closing: Turn thumbwheels =
and ? upward or downward. Side air vents Example illustration driver’s side
:
Left side defroster air vent, fixed
; Left side air vent, adjustable
= Thumbwheel for air volume control for
adjustable left side air vent
X Opening/closing: Turn thumbwheel =
upward or downward.
Rear center console air vents :
Rear climate control panel
; Right rear center air vent, adjustable
= Left rear center air vent, adjustable
When the front climate control panel is
switched on or off, the air supply through the
rear center air vents is also switched on or
off. Overview of climate control system functions and air vents
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B-pillar air vents
Vehicles with 3-zone automatic climate control
(second row) only
:
Side air vent, adjustable
; Thumbwheel for air volume control
X Opening/closing: Turn thumbwheel ; to
the left or to the right. Air vents below rear quarter windows Vehicles with 3-zone automatic climate control
(second and third row) only
:
Defrost air vent for rear quarter window,
fixed
; Air vent, adjustable
= Thumbwheel for air volume control
X Opening/closing: Turn thumbwheel =
upward or downward. Climate control
Control panel164
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Function Recommendation/Notes
:
Temperature control, driver’s
side i
Set the temperature to 72 ‡
(22†). (Y page 168)
;
Air distribution and air volume
(automatic mode) i
Switches on the automatic
mode. The indicator lamp in
button à comes on. (Y page 167)
=
Front defroster i
Keep this setting selected
only

until the windshield or the
side windows are clear again. (Y page 168)
?
Increasing air volume (Y page 168)
A
Air distribution (directs air
through the windshield and side
air vents) (Y page 168)
B
AC cooling on/off i
Switches on the air
conditioning. The indicator
lamp in button Á comes
on. (Y page 167)
Residual heat/ventilation i
With
the engine turned off, it
is possible to continue to heat
or ventilate the interior. (Y page 170)
C
Temperature control, passenger
side i
Set the temperature to 72
‡
(22†). (Y page 168)
D
± Rear climate control on/
off or air supply for rear
passenger compartment on/off
(USA only)
^ Rear climate control on/
off or air supply for rear
passenger compartment on/off
(Canada only)
E
Air distribution (directs air
through center and side air
vents) (Y page 168)
F
Air distribution (directs air
through the footwells and side
air vents) (Y page 168)
G
Air volume display
H
Decreasing air volume (Y page 168)Climate control
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Function Recommendation/Notes
I
Rear window defroster (Y page 180)
J
Air recirculation i
Only 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 169)
K
Interior temperature sensor
L
Climate control on/off i
Switches on the climate
control system. The indicator
lamp

in button ^ goes out. (Y page 166)
Notes on climate control
The climate control is operational whenever
the engine is running. You can operate the
climate control system in either the
automatic

or manual mode. The system cools
or heats the interior depending on the
selected interior temperature and the current
outside temperature.
Nearly all dust particles, pollutants and odors
are filtered out before outside air enters the
passenger compartment through the air
distribution system. G
Warning!
Severe conditions (e.g. strong air pollution)
may require replacement of the filter before
its

scheduled replacement interval. A clogged
filter will reduce the air volume to the interior
and the windows could fog up, impairing
visibility and endangering you and others.
Have a clogged filter replaced as soon as
possible at an authorized Mercedes-Benz
Center.
The air conditioning will not engage (no
cooling) if the A/C mode is deactivated
(Y page 167). G
Warning!
Follow the recommended settings for heating
and cooling given on the following pages.
Otherwise the windows could fog up, impairing visibility and endangering you and
others.
Keep the air intake grille in front of the
windshield free of snow and debris.
i If the vehicle interior is hot, ventilate the
interior before driving off, see “Summer
opening

feature” (Y page 108). The climate
control will then adjust the interior
temperature to the set value much faster. Deactivating the climate control
system
G
Warning!
When the climate control system is switched
off, the outside air supply and circulation are
also

switched off. Only choose this setting for
a short time. Otherwise the windows could fog
up, impairing visibility and endangering you
and others.
X Deactivating: Press button ^.
The
indicator lamp in the button comes on.
X Reactivating: Press button Ã.
i You can also press button ^ on the
climate control panel. 166
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If you press button ¦ to reactivate the
climate control system, the defrosting
mode is activated.
Deactivating the rear climate control
from the front X
Deactivating: Press button ±.
The indicator lamp in the button comes on.
X Reactivating: Press button ±.
The indicator lamp in the button goes out. Air conditioning
The air conditioning is operational while the
engine

is running and cools the interior air to
the temperature set by the operator. In
addition, the air conditioning dehumidifies
the interior air and helps prevent window
fogging. G
Warning!
If you switch off 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.
i Condensation may drip out from
underneath the vehicle. This is normal and
not an indication of a malfunction.
Deactivating It is possible to deactivate the air
conditioning. The interior air will then no
longer be cooled or dehumidified.
X
Press button Á.
The indicator lamp in 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. X
Press button Á again.
The
indicator lamp in the button comes on.
The air conditioning uses the refrigerant
R134a.
This refrigerant is free of CFCs which
are harmful to the ozone layer.
! If the air conditioning cannot be activated
again, this indicates that the air
conditioning is losing refrigerant. The
compressor has turned off.
Have the air conditioning checked at the
nearest authorized Mercedes-Benz Center. 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. G
Warning!
If you switch off 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.
X Set the desired temperature
(Y page 168).
X Activating: Press button Ã.
The
indicator lamp in the button comes on.
The air volume and air distribution are
adjusted automatically.
i The settings for the passenger side are
also used for the rear passenger
compartment.
X Deactivating:
Press button I or K.
The indicator lamp in button à goes out.
The automatic operation of air volume
switches off. The selected blower speed is Climate control
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shown in air volume display
G
(Y page 164).
or
X Press air distribution button ¯, P, or
O.
The indicator lamp in button à goes out.
The automatic operation of air distribution
switches off. Setting the temperature
You can adjust the air temperature on each
side of the passenger compartment. You
should

raise or lower the temperature setting
in small increments, preferably starting at
72‡ (22†).
X Increasing/decreasing: Turn
temperature control : and/or C
(Y page 164) slightly clockwise or
counterclockwise. Adjusting air distribution
The
air distribution can be adjusted manually.
The symbols on the buttons represent the
following functions: Symbol Function
¯
Directs air to the windshield and
side air vents
P
Directs air through the center
and side air vents
O
Directs air to the footwells and
side air vents
X
Press the desired air distribution button
¯, P, or O.
The

indicator lamp in button à goes out.
The automatic mode is switched off. Air
distribution is controlled according to the
desired button. Adjusting air volume
X Decreasing/increasing: Press button
I or K.
The automatic mode is switched off. The
selected blower speed is shown in air
volume display G (Y page 164).
When using the Voice Control System, the
blower speed reduces automatically. When
the Voice Control System is not used
anymore, the blower speed increases to the
previously selected level. Front defroster
You can use this setting to defrost the
windshield, for example if it is iced up.
You can also defog the windshield and the
side windows.
i Keep this setting selected only until the
windshield or the side windows are clear
again.
Activating X
Press button ¦.
The
indicator lamp in the button comes on.
The climate control switches to the
following functions automatically:
R most efficient blower speed and heating
power, depending on outside
temperature
R air flows onto the windshield and the
front door windows (side air vents must
be open)
R the air conditioning compressor
switches on at outside temperatures
above approximately 41‡ (5†) for air-
drying
Adjustments
You can adjust the air volume and the
temperature when the front defroster is
switched on. The air flow will remain on the
windshield and front door windows. 168
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