Mercedes-Benz CLS Owner's Manual page 404

Battery
Display messages
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12 V battery See Owner's
Manual
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See Owner's Manual
Possible causes/consequences and
* The engine is off and the charge level 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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* If the message appears while the engine is running, this indicates an on-board electrical system malfunction.
Consult a qualified specialist workshop.
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* The 12 V battery is not being charged.
* NOTE Possible engine damage if you continue driving
Do not continue driving under any circumstances.
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Consult a qualified specialist workshop.
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Stop the vehicle immediately in accordance with the traffic conditions and switch off the engine.
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Consult a qualified specialist workshop.
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Display messages and warning/indicator lamps 401
M M Solutions