User Manual - Page 71

For 2020 C-Class Sedan C 300.

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Problem
Possible causes/consequences and M Solutions
R
There is interference from a powerful radio signal source.
R
The SmartKey is faulty.
#
Activate the SmartKey functions (/ page 65).
#
Check the battery using the battery check lamp and replace if necessary (/ page 66).
#
Use the emergency key to unlock or lock the vehicle (/ page 66).
#
Have the vehicle and SmartKey checked at a qualified specialist workshop.
Activating/deactivating the automatic lock
ing feature
The vehicle is locked automatically when the
ignition is switched on and the wheels are turn
ing faster than walking pace.
Opening and closing
71
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