Mercedes-Benz 2006 CLS 500 Operator's Manual page 387

Cls-class
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Practical hints
What to do if ...
Display symbol
Display messages
F
Key
Check battery
Key
not recognized
Key
not recognized
386
Possible cause/consequence
The SmartKey with KEYLESS-GO* batter-
ies are discharged.
The SmartKey with KEYLESS-GO* is not
recognized while the engine is running
because
the SmartKey with KEYLESS-GO* is
not in the vehicle
there is strong radio-frequency inter-
ference
The SmartKey with KEYLESS-GO* is mo-
mentarily not recognized.
Possible solution
Change the batteries ( page 408).
Stop the vehicle as soon as it is safe
to do so.
Search for the SmartKey.
Otherwise the vehicle cannot be cen-
trally locked nor can the engine be
started again after the engine is
stopped.
Change the position of the SmartKey
in the vehicle.
Operate the vehicle with the
SmartKey in the starter switch if nec-
essary.

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