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Problems with the rear window defroster
Problem
Possible causes/consequences and MM Solutions
The indicator lamp on
the ¤ button
flashes. The rear win-
dow defroster has deac-
tivated prematurely or
cannot be activated.
The on-board voltage is too low because too many electrical con-
sumers are switched on.
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.
The roof is open.
X
Close the roof.
When the roof is closed, the rear window defroster can be activa-
ted again.
Switching air-recirculation mode
on/off
General notes
If you switch on air-recirculation mode, the
windows can fog up more quickly, in particular
at low temperatures. Only use air-recirculation
mode briefly to prevent the windows from fog-
ging up.
Activating/deactivating
X
Turn the SmartKey to position 2 in the igni-
tion lock (Y page 118).
X
To activate: press the g button.
The indicator lamp in the g button lights
up.
i
Air-recirculation mode is automatically
activated at high levels of pollution (dual-
zone automatic climate control only) or at
high outside temperatures. When air-recir-
culation mode is activated automatically,
the indicator lamp in the g button is not
lit. Outside air is added after about
30 minutes.
X
To deactivate: press the g button.
The indicator lamp in the g button goes
out.
i Air-recirculation mode deactivates auto-
matically:
R
after approximately five minutes at out-
side 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 dehumidifi-
cation" function is activated
Switching the residual heat on or off
General notes
The residual heat function is only available on
vehicles for Canada.
It is possible to make use of the residual heat
of the engine to continue heating the station-
ary vehicle for up to 30 minutes after the
engine has been switched off. The heating
time depends on the set interior temperature.
Activating/deactivating
X
Turn the SmartKey to position u in the igni-
tion lock or remove it (Y page 118).
X
To activate: press the Ì or Á but-
ton.
The indicator lamp in the Ì or Á but-
ton lights up.
i
The blower will run at a low speed regard-
less of the airflow setting.
114
Operating the climate control systems
Climate control
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