Problem With The Rear Window Defroster - Mercedes-Benz 2016 S-Class Operator's Manual

Operating the climate control systems
152
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 162).
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
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.
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.
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
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 continue heating
or ventilating for approximately 30 minutes.
Vehicles without 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
front compartment of the vehicle for approx-
imately 30 minutes.
The heating or ventilation time depends on the
temperature that has been set.