Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 181

The health of persons with limited temperature
sensitivity or a limited ability to react to high
temperatures may be affected or they may
even suffer burn-like injuries.
Do not touch the windscreen while the
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windscreen heater is switched on.
Allow the windscreen to cool down
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before touching it.
The windscreen heater will be enabled automati-
cally if ¬ is activated on the climate bar on the
central display.
After the vehicle is started, the windscreen heater
is switched on automatically as required.
Pre-entry climate control for departure time
▌Pre-entry climate control for departure time
function
& WARNING Danger to life due to exposure
to extreme heat or cold in the vehicle
If people, particularly children, are exposed to
extreme temperatures over an extended
period of time, there is a risk of serious injury
or danger to life.
Never leave persons, children in particu-
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lar, unattended in the vehicle.
& WARNING Risk of burns due to repeatedly
switching on the seat heating
Repeatedly switching on the seat heating can
cause the seat cushion and seat backrest pad-
ding to become very hot.
In particular, the health of persons with limited
temperature sensitivity or a limited ability to
react to high temperatures may be affected or
they may even suffer burn-like injuries.
P223 0288 02
Climate control 179
Do not repeatedly switch on the seat
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heating.
To protect against overheating, the seat heating
may be temporarily deactivated after it is
switched on repeatedly.
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This function is available only in vehicles with
a 48 V on-board electrical system (EQ Boost
technology).
The air inside the vehicle can be heated, ventila-
ted or cooled to the set temperature when the
vehicle is parked.
When the vehicle is connected to power supply
equipment, priority is given to charging the 48 V
battery to a specified minimum charge.
The running time of pre-entry climate control may
be reduced under the following conditions:
The vehicle is not connected to power supply
R
equipment.
The 48 V battery is not fully charged.
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With active pre-entry climate control, the charge
level of the 48 V battery may be reduced, even if
the charging cable connector is connected.