Problem With The Rear Window Defroster - Mercedes-Benz 2015 M-Class Operator's Manual

Problems with the rear window defroster
Problem
The rear window
defroster has deactiva-
ted prematurely or can-
not be activated.
Activating/deactivating air-recircula-
tion mode
General notes
You can deactivate the flow of fresh air if
unpleasant odors are entering the vehicle
from outside. The air already inside the vehi-
cle will then be recirculated.
If you switch on air-recirculation mode, the
windows can fog up more quickly, in particu-
lar at low temperatures. Only use air-recircu-
lation mode briefly to prevent the windows
from fogging up.
Activating/deactivating
The operation of air-recirculation mode is the
same for all control panels.
Turn the SmartKey to position 2 in the igni-
X
tion lock ( page 157).
Y
To activate: press the d button.
X
The indicator lamp in the d button lights
up.
i
In the event of high pollution levels (3-
zone automatic climate control only) or at
Operating the climate control systems
Possible causes/consequences and M M Solutions
The battery has not been sufficiently charged.
Switch off any consumers that are not required, e.g. reading
X
lamps, interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window
defroster can be activated again.
high outside temperatures, air-recircula-
tion mode is automatically activated. When
air-recirculation mode is activated auto-
matically, the indicator lamp in the d
button is not lit.
Outside air is added after about
30 minutes.
To deactivate: press the d button.
X
The indicator lamp in the d button goes
out.
i
Air-recirculation mode deactivates auto-
matically:
after approximately five minutes at out-
R
side temperatures below approximately
41 ‡ (5 †)
after approximately five minutes if cool-
R
ing with air dehumidification is deactiva-
ted
after approximately 30 minutes at out-
R
side temperatures above approximately
41 ‡ (5 †) if the "Cooling with air dehu-
midification" function is activated
Activating/deactivating the residual
heat function
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.
151