Problem With The Rear Window Defroster - Mercedes-Benz S-Class Coupe Operator's Manual

Operating the climate control systems
116
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 automatically
after several minutes.
If the battery voltage is too low, the rear window
defroster may switch off.
Problems with the rear window defroster
Problem
The rear window
defroster has deactiva-
ted prematurely or can-
not be activated.
Switching air-recirculation mode
on/off
General notes
You can also temporarily deactivate the flow of
fresh air manually if unpleasant odors are enter-
ing 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.
Activating/deactivating
Turn the SmartKey to position 2 in the ignition
X
lock ( page 121).
Y
To activate: press the g rocker switch up
X
or down.
The indicator lamp in the g rocker switch
lights up.
Air-recirculation mode switches on automati-
cally:
at high outside temperatures
R
at high levels of pollution
R
in a tunnel
R
Possible causes/consequences and M Solutions
The battery has not been sufficiently charged.
Switch off any consumers that are not required, e.g. reading lamps,
X
interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window defroster
can be activated again.
Activating or deactivating
Turn the SmartKey to position 2 in the ignition
X
lock ( page 121).
Y
Press the ¤ rocker switch up or down.
X
The indicator lamp in the ¤ rocker switch
lights up or goes out.
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.
To deactivate: press the g rocker switch
X
up or down.
The indicator lamp in the g rocker switch
goes out.
Air-recirculation mode deactivates automati-
cally:
after approximately five minutes at outside
R
temperatures below approximately 41 ‡
(5 †)
after approximately five minutes if cooling
R
with air dehumidification is deactivated
after approximately 30 minutes at outside
R
temperatures above approximately 41 ‡
(5 †) if the "Cooling with air dehumidifica-
tion" function is activated
Switching the residual heat on or off
General notes
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 front com-
partment of the vehicle for approximately
30 minutes.