Mercedes-Benz S-Class 2020 Owner's Manual page 198

do not use the key and keep it away
from children.
If batteries are swallowed, seek medical
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attention immediately.
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ENVIRONMENTAL NOTE Environmental
damage due to improper disposal of bat‐
teries
Batteries contain toxic and corro‐
sive substances.
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Take discharged batteries to a
qualified specialist workshop or to a
collection point for used batteries.
Requirements:
One CR2450 lithium battery
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Push a pointed object into recess 1.
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Slide battery cover 2 backwards in the
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direction of the arrow.
Insert new battery 3 with the lettering
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facing 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.
Climate control 195
Problems with the remote control for the
stationary heater/ventilation
FAIL ¨ ¨ appears on the remote control dis‐
play
Possible cause:
The signal transmission between the trans‐
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mitter and the receiver is malfunctioning.
Change your position in relation to the vehi‐
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cle, moving closer if necessary.
FAIL appears on the remote control display
Possible cause:
The starter battery is not sufficiently
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charged.
Charge the starter battery.
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Possible cause:
The outside temperature is higher than
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15 °C.
Use the stationary heater only if the outside
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temperature is below 15 °C.