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If the battery voltage is too low, the rear window
defroster may switch off.
Activating/deactivating
X
Turn the SmartKey to position 2 in the igni-
tion lock (Y page 123).
X
Press the ¤ button.
The indicator lamp in the ¤ button lights
up or goes out.
Problems with the rear window defroster
Problem
Possible causes/consequences and MM Solutions
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.
Switching air-recirculation mode
on/off
General notes
You can deactivate the flow of fresh air if
unpleasant odors are entering the vehicle from
outside. The air already inside the vehicle will
then be recirculated.
If you switch on air-recirculation mode, the win-
dows can fog up more quickly, in particular at
low temperatures. Only use air-recirculation
mode briefly to prevent the windows from fog-
ging up.
The operation of air-recirculation mode is the
same for all control panels.
Activating/deactivating
X
Turn the SmartKey to position 2 in the igni-
tion lock (Y page 123).
X
To activate: press the e button.
The indicator lamp in the e button lights
up.
Air-recirculation mode switches on automati-
cally:
R
at high outside temperatures
R
at high levels of pollution
When air-recirculation mode is activated auto-
matically, the indicator lamp in the e button
is not lit. Outside air is added after about
30 minutes.
X
To deactivate: press the e button.
The indicator lamp in the e button goes
out.
i Air-recirculation mode deactivates auto-
matically:
R
after approximately five minutes at outside
temperatures below approximately 45 ‡
(7 †)
R
after approximately five minutes if the
"Cooling with air dehumidification" func-
tion is deactivated
R
after approximately 30 minutes at outside
temperatures above approximately 45 ‡
(7 †) if the "Cooling with dehumidification"
function is activated
Switching the residual heat on or off
General notes
The residual heat function is only available in
vehicles for Canada with dual-zone automatic
climate control.
It is possible to make use of the residual heat of
the engine to continue heating the vehicle for
approximately 30 minutes after the engine has
been switched off. The heating time depends on
the set interior temperature.
i
The blower will run at a low speed regardless
of the airflow setting.
120
Operating the climate control systems
Climate control
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