Mercedes-Benz S-Class Coupe 2018 Operator's Manual page 435

SmartKey
Display messages
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Obtain a New Key
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Replace Key Battery
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Key Not Detected (white
display message)
Possible causes/consequences and
* The SmartKey needs to be replaced.
Visit a qualified specialist workshop.
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* The SmartKey battery is discharged.
Replace the battery .
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* The SmartKey is currently undetected.
Change the location of the SmartKey in the vehicle.
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If the SmartKey is still not recognized, start the engine with the SmartKey in the stowage compartment .
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Display messages and warning/indicator lamps 433
M Solutions