Mercedes-Benz S-Class 2020 Owner's Manual page 553

550 Display messages and warning/indicator lamps
Display messages
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Switch on the engine to
charge the 12 V battery
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Stop the vehicle Leave the
engine running to charge
the 12 V battery
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Stop vehicle See Owner's
Manual
Possible causes/consequences and
* The engine is off and the charge level of the 12 V battery is too low.
Switch off electrical consumers that are not required.
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To charge the 12 V battery:
Leave the engine running for a few minutes, or drive an extended distance.
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* The 12 V battery charge level is too low.
Stop the vehicle immediately in accordance with the traffic conditions. Do not continue driving.
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Leave the engine running.
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If the display message disappears: drive on.
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If the display message does not disappear: consult a qualified specialist workshop.
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* The 48 V on-board electrical system is malfunctioning.
Stop the vehicle immediately in accordance with the traffic conditions. Do not continue driving.
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Switch off the engine.
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Consult a qualified specialist workshop.
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M M Solutions