Mercedes-Benz SL-Class 2014 Owners Manual - Manual (Page 152)

Problems with the rear window defroster
Problem Possible causes/consequences and M M Solutions
The rear window
defroster has
deactivated
prematurely or cannot
be activated.
The on-board voltage is too low because too many electrical
consumers 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.
Activating/deactivating air-
recirculation mode
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 fogging up.
Activating/deactivating
X Turn the SmartKey to position 2 in the
ignition lock (
Y
page 155).
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 or at
high outside temperatures. When air-
recirculation 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
automatically:
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 dehumidification" function is
activated
Activating/deactivating the residual
heat function
General notes
150
Operating the climate control systems
Climate
control