Mercedes-Benz CLS Owner's Manual page 395

392 Display messages and warning/indicator lamps
Display messages
Active Lane Keeping Assist
inoperative
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Currently unavailable
Radar sensors dirty
Possible causes/consequences and
* Active Lane Keeping Assist is malfunctioning.
Consult a qualified specialist workshop.
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* The radar sensor system is malfunctioning. Possible causes:
dirt on the sensors
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heavy rain or snow
R
extended country driving without other traffic, e.g. in the desert
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Driving systems and driving safety systems may be malfunctioning or temporarily unavailable.
Once the cause of the problem is no longer present, the driving systems and driving safety systems will be available
again.
If the display message does not disappear:
Stop the vehicle in accordance with the traffic conditions.
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Clean all sensors ( page 302).
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Restart the engine.
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M M Solutions