Mercedes-Benz C-Class Convertible 2021 Operator's Manual page 404

402 Display messages and warning/indicator lamps
SmartKey
Display messages
Possible causes/consequences and
Á
* Have SmartKey replaced.
Obtain a New Key
Á
* The SmartKey battery is discharged.
Replace Key Battery
Á
* The SmartKey is currently undetected.
Key Not Detected (white
display message)
Consult a qualified specialist workshop.
#
Replace the battery ( page 65).
/
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Change the location of the SmartKey in the vehicle.
#
If the SmartKey is still not recognized, place it in the marked space for starting with the SmartKey
#
( page 126).
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M M Solutions