Canada only
Front control panel
: Sets climate control to automatic, left (Y page 171)
; Sets the temperature, left (Y page 173)
= Sets the airflow, left (Y page 174)
? Activates/deactivates air-recirculation mode (Y page 177)
A Defrosts the windshield (Y page 175)
B Calls up the COMAND climate control menu
C Switches the rear window defroster on/off (Y page 176)
D Activates/deactivates cooling with air dehumidification (Y page 170)
Activates/deactivates the residual heat function (Y page 177)
E Sets the airflow, right (Y page 174)
F Sets the temperature, right (Y page 173)
G Sets climate control to automatic, right (Y page 171)
Rear control panel (vehicles with rear-compartment climate control)
H Sets the temperature, left (Y page 173)
I Sets the air distribution, left (Y page 174)
J Sets climate control to automatic (Y page 171)
K Sets the airflow (Y page 174)
L Switches climate control on/off (Y page 169)
Activates/deactivates the residual heat function (Y page 177)
M Sets the air distribution, right (Y page 174)
N Sets the temperature, right (Y page 173)166
Overview of climate control systemsClimate control
PLUG-IN HYBRID (USA only)
Front control panel
: Sets climate control to automatic, left (Y page 171)
; Sets the temperature, left (Y page 173)
= Sets the airflow, left (Y page 174)
? Activates/deactivates air-recirculation mode manually (Y page 177)
A Defrosts the windshield (Y page 175)
B Calls up the COMAND climate control menu
Activates/deactivates the residual heat function (Y page 177)
C Switches the rear window defroster on/off (Y page 176)
D Activates/deactivates "immediate pre-entry climate control" (Y page 183)
E Sets the airflow, right (Y page 174)
F Sets the temperature, right (Y page 173)
G Sets climate control to automatic, right (Y page 171)
Rear control panel (vehicles with rear-compartment climate control)
H Sets the temperature, left (Y page 173)
I Sets the air distribution, left (Y page 174)
J Sets climate control to automatic (Y page 171)
K Sets the airflow (Y page 174)
L Switches climate control on/off (Y page 169)
Activates/deactivates the residual heat function (Y page 177)
M Sets the air distribution, right (Y page 174)
N Sets the temperature, right (Y page 173) Overview of climate control systems
167Climate control
PLUG-IN HYBRID (Canada only)
Front control panel
: Sets climate control to automatic, left (Y page 171)
; Sets the temperature, left (Y page 173)
= Sets the airflow, left (Y page 174)
? Activates/deactivates air-recirculation mode manually (Y page 177)
A Defrosts the windshield (Y page 175)
B Calls up the COMAND climate control menu
Activates/deactivates the residual heat function (Y page 177)
C Switches the rear window defroster on/off (Y page 176)
D Activates/deactivates "immediate pre-entry climate control" (Y page 183)
E Sets the airflow, right (Y page 174)
F Sets the temperature, right (Y page 173)
G Sets climate control to automatic, right (Y page 171)
Rear control panel (vehicles with rear-compartment climate control)
H Sets the temperature, left (Y page 173)
I Sets the air distribution, left (Y page 174)
J Sets climate control to automatic (Y page 171)
K Sets the airflow (Y page 174)
L Switches climate control on/off (Y page 169)
Activates/deactivates the residual heat function (Y page 177)
M Sets the air distribution, right (Y page 174)
N Sets the temperature, right (Y page 173)168
Overview of climate control systemsClimate control
Notes on using automatic climate
control
Climate control system Below, you can find a number of notes and
recommendations to help you use climate
control optimally.
R Activate climate control using the Ã
rocker switch. The indicator lamp in the
à rocker switch lights up.
R Set the temperature to 72 ‡ (22 †).
R Only use the "Windshield defrosting" func-
tion briefly until the windshield is clear
again.
R Only use air-recirculation mode briefly, e.g.
if there are unpleasant outside odors or
when in a tunnel. The windows could oth-
erwise fog up, since no fresh air is drawn
into the vehicle in air-recirculation mode.
R Use the residual heat function if you want to
heat or ventilate the vehicle interior when
the ignition is switched off. The residual
heat function can only be activated or deac- tivated with the ignition switched off. The
residual heat function is switched off whenthe ignition is switched on.
If you are controlling the rear climate control using the front control panel, note the follow-
ing:
R If you set rear-compartment climate con-
trol using the front control panel, the Y
symbol appears in the rear-compartment
control panel display.
R If the rear-compartment climate control is
set using the front control panel, it cannot
be set at the same time using the rear con- trol panel. If controlling the rear climate
control from the front control panel is
locked, wait five seconds. You will then be
able to control the rear climate control
using the rear control panel.
R After selecting the rear compartment set-
tings, the front climate control can be con-
trolled automatically again via COMAND
after five seconds. Alternatively, you can select "Cancel rear
compartment" in the COMAND air-condi-
tioning function bar.
ECO start/stop function During automatic engine switch-off, the cli-
mate control system only operates at a
reduced capacity. If you require the full cli-
mate control output, you can switch off the
ECO start/stop function by pressing the ECO
button (Y page 194). Operating the climate control sys-
tems Switching climate control on/off
General notes When the climate control is switched off, the
air supply and air circulation are also
switched off. The windows could fog up.
Therefore, switch off climate control only
briefly
Switch on climate control primarily using the
à rocker switch (Y page 171).
Switching the front climate control on
and off using the control panel X
Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X To activate: press thetrocker switch
up or down.
The COMAND climate control menu opens.
X Activate climate control via the air-condi-
tioning setting bar in COMAND (see the
separate operating instructions).
X To deactivate: press thetrocker
switch up or down.
The COMAND climate control menu opens.
X Deactivate climate control via the air-con-
ditioning setting bar in COMAND (see the
separate operating instructions). Operating the climate control systems
169Climate control
Setting the rear compartment airflow
using the front control panel X
Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X Press the top or bottom section of the t
rocker switch.
The COMAND climate control menu opens.
X Select "Rear adjustment" in the air-condi-
tioning setting bar (see the separate
COMAND operating instructions).
You can control the rear-compartment cli-
mate control using the front control panel
or COMAND.
X To increase/reduce: press theK
rocker switch on the front control panel up or down.
or
X Set the airflow using COMAND (see the
separate operating instructions).
Setting the rear compartment airflow
using the rear control panel X
Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X To increase/reduce: press rocker switch
K up or down (Y page 165). Switching the synchronization func-
tion on/off
Climate control can be set centrally using the synchronization function. The settings for
temperature, air distribution and airflow on
the driver's side are adopted for the front-
passenger side and the rear compartment
(vehicles with rear-compartment air condi-
tioning).
X To activate/deactivate: switch the syn-
chronization function on or off using COMAND (see the separate operating
instructions).
Vehicles with rear-compartment air condi-
tioning: the
SYNC SYNCdisplay appears on the
rear-compartment display.
The synchronization function is deactivated:
R if the settings for the front-passenger side
are changed
R vehicles with rear-compartment air condi-
tioning: the settings for the rear compart-
ment are changed Defrosting the windshield
You can use this function to defrost the wind-
shield or to clear a fogged up windshield or
front side windows on the inside.
Switch off the "Windshield defrosting" func-
tion as soon as the windshield is clear again.
X Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X To activate: press the¬rocker switch
on the front control unit up or down.
The indicator lamp in the ¬rocker
switch lights up.
The climate control system switches to the
following functions:
R high airflow
R high temperature
R air distribution to the windshield and
front side windows
R air-recirculation mode off
R windshield heating on
X To deactivate: press the¬rocker
switch up or down.
The indicator lamp in the ¬rocker
switch goes out. The previously selected
settings are restored. Air-recirculation
mode remains deactivated.
or
X Press the Ãrocker switch up or down. Operating the climate control systems
175Climate control
or
X Use the trocker switch to call up the
COMAND climate control menu. Defrosting the windows
Windows fogged up on the inside X
Activate the "Cooling with air dehumidifi-
cation" function with the Árocker
switch.
or X Activate the "Cooling with air dehumidifi-
cation" function via COMAND (see the sep- arate operating instructions).
X Switch on automatic mode using the Ã
rocker switch.
X If the windows continue to fog up, activate
the "Windshield defrosting" function using
the ¬ rocker switch. The windshield
heating is switched on.
i You should only select this setting until
the windshield is clear again.
Windows fogged up on the outside X
Activate the windshield wipers.
X Switch on automatic mode using the Ã
rocker switch.
i If you clean the windows regularly, they
do not fog up so quickly. Rear window defroster
General notes The rear window defroster has a high current
draw. You should therefore switch it off as
soon as the rear window is clear. Otherwise,
the rear window defroster switches off auto-
matically after several minutes.
If the battery voltage is too low, the rear win-
dow defroster may switch off. Activating/deactivating X
Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X Press the ¤rocker switch up or down.
The indicator lamp in the ¤rocker
switch lights up or goes out. 176
Operating the climate control systemsClimate control
Problems with the rear window defroster
Problem
Possible causes/consequences and
M
MSolutions The rear window
defroster has deactiva-
ted prematurely or can-
not be activated. The battery has not been sufficiently charged.
X Switch off any consumers that are not required, e.g. reading
lamps, interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window
defroster can be activated again. Activating/deactivating air-recircula-
tion mode
General notes You can also temporarily deactivate the flow
of fresh air manually if unpleasant odors are
entering the vehicle from outside. The air
already inside the vehicle will then be recir-
culated.
If you switch on air-recirculation mode, the
windows can fog up more quickly, in particu-
lar at low temperatures. Only use air-recircu-
lation mode briefly to prevent the windows
from fogging up.
Activating/deactivating X
Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X To activate: press thegrocker switch
up or down.
The indicator lamp in the grocker
switch lights up.
Air-recirculation mode is automatically acti-
vated at high levels of pollution or at high out- side temperatures. The indicator lamp in the
g rocker switch is not lit when automatic
air-recirculation mode is activated. Outside
air is added after about 30 minutes.
X To deactivate: press thegrocker
switch up or down.
The indicator lamp in the grocker
switch goes out. Air-recirculation mode deactivates automati-
cally:
R after approximately five minutes at outside
temperatures below approximately 41 ‡
(5 †)
R after approximately five minutes if cooling
with air dehumidification is deactivated
R after approximately 30 minutes at outside
temperatures above approximately 41 ‡
(5 †) if the "Cooling with air dehumidifica-
tion" function is activated Activating/deactivating the residual
heat function
General notes Vehicles with rear-compartment climate
control:
once the engine is switched off, it is
possible to make use of the residual heat of
the engine to continue heating or ventilating
the rear and front compartment of the vehicle
for approximately 15 minutes. If the "Residual
heat" function is set for only the front or only
the rear compartment, it is possible to con-
tinue heating or ventilating for approximately
30 minutes.
Vehicles without rear-compartment cli-
mate control: once the engine is switched
off, it is possible to make use of the residual
heat of the engine to continue heating or ven- tilating the front compartment of the vehicle
for approximately 30 minutes.
The heating or ventilation time depends on
the temperature that has been set. Operating the climate control systems
177Climate control
Problems with the perfume atomizer
Problem
Possible causes/consequences and
M
MSolutions The vehicle interior is
not perfumed although
the perfume atomizer is
activated. The perfume vial has not been pushed into the holder as far as it
will go.
X Slide the perfume vial into the holder as far as it will go. The perfume vial has not been adequately filled.
X Pre-filled vials: dispose of the empty vial.
X Use a new pre-filled vial.
X Refillable vials: refill the vial with a maximum of 15 ml of the
same perfume. The perfume atomizer is faulty.
X Have the perfume atomizer checked at a qualified specialist
workshop. Ionization
You can use the "Ionization" function to purify
the air in the vehicle interior and attain an
improved interior climate.
The ionization of the interior air is odorless
and cannot be perceived directly in the vehi-
cle interior.
You can switch ionization on and off using
COMAND (see the separate operating
instructions).
Ionization can only be switched on if the front automatic climate control is activated. The
side air vent on the driver's side must be
open. Pre-entry climate control via Smart-
Key
General notes The "Pre-entry climate control via SmartKey"
function is only available on PLUG-IN HYBRID
vehicles.
Before getting in, the driver's seat area or the whole interior can be briefly warmed or ven-
tilated in advance with the air from the air
vents being pre-cooled. The high-voltage battery must be sufficiently
charged before "Pre-entry climate control via
SmartKey" can be activated.
When the vehicle is pre-cooled, the following functions are activated:
R Climate control system
R Blower
R Seat ventilation
When the vehicle is pre-warmed, the following
functions are activated:
R Climate control system
R Blower
R Seat heating
R Steering wheel heating
R Exterior mirror heating
R Rear window defroster
If you have activated the following functions
using COMAND, they are activated together
with the "Pre-entry climate control via Smart-
Key" function:
R Armrest heating
R perfume atomizer
R Ionization 180
Operating the climate control systemsClimate control