Mercedes-Benz S-Class Owner's Manual page 574

572 Display messages and warning/indicator lamps
Display messages Possible causes/consequences and
* The charge level of the 48 V battery is too low. You can no longer start the engine.
Cannot start engine See
Owner's Manual
* The 48 V battery has been charged automatically via the voltage converter.
Motor can be started again
* The fan motor is defective.
?
?
* The coolant is too hot.
Coolant Stop vehicle
Switch engine off
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do not
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continue driving under any circumstances.
Switch off the engine.
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Consult a qualified specialist workshop.
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Switch off electrical consumers that are not required.
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Connect a suitable charger approved by Mercedes-Benz with sufficient charge output to the jump-start connec‐
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tion point of the 12 V battery (
→
The 48 V battery is charged via the voltage converter in the vehicle.
Start the engine and drive the vehicle for a while to charge the 12 V battery and the 48 V battery.
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Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. In doing so, ensure that
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the coolant temperature display remains below 120 °C.
Stop the vehicle immediately, paying attention to road and traffic conditions, and switch off the engine.
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M M Solutions
page 492).