Mercedes-Benz S-Class Saloon 2021 Owner's Manual page 198

Slide battery cover 2 backwards in the direc-
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tion of the arrow.
Insert new battery 3 with the lettering facing
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upwards.
Slide battery cover 2 in the opposite direc-
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tion to the arrow onto the remote control until
the battery cover engages.
Pr Problems wit oblems with t h the r he remot emote contr e control f
ar ary heat y heater/v er/ventilation entilation
F F AIL AIL ¨ ¨ appear appears on t s on the r he remot emote contr e control display
Possible cause:
The signal transmission between the transmit-
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ter and the receiver is malfunctioning.
Change your position in relation to the vehicle,
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moving closer if necessary.
F F AIL appear AIL appears on t s on the r he remot emote contr e control display
Possible cause:
The starter battery is not su ciently charged.
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Charge the starter battery.
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Possible cause:
The outside temperature is higher than 15 °C.
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Use the stationary heater only if the outside
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temperature is below 15 °C.
Possible cause:
The fuel tank is not su ciently lled.
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ol for t or the st he station- ation-
Refuel at the nearest lling station.
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F F AIL AIL ¯ ¯ appear
ol display
Possible cause:
There is a malfunction in the stationary heater.
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Have the stationary heater checked at a quali-
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ed specialist workshop.
Air vents Air v ents
ol display
A A djus djusting t ting the fr
& W W ARNING
ARNING Risk of burns or frostbite due to
being too close to the air vents
Very hot or very cold air can ow from the air
vents.
appears on t s on the r he remot emote contr e control display ol display
he front air v ont air vents ents
Climate control 195
Make sure that all vehicle occupants
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always maintain a su cient distance
from the air vents.
If necessary, direct the air ow to another
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area of the vehicle interior.
To guarantee the ow of fresh air through the air
vents into the vehicle interior, comply with the fol-
lowing:
Always keep the vents and ventilation grilles in
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the vehicle interior clear.
Keep the air inlet grille free of residue build-up
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( page 419).
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