User Manual - Page 70

For 2020 C-CLASS.

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Problems with the SmartKey
Problem
Possible causes/consequences and
MM Solutions
You can no longer lock or unlock the
vehicle.
Possible causes:
R
The SmartKey battery is discharged or nearly discharged.
R
There is interference from a powerful radio signal source.
R
The SmartKey is faulty.
#
Check the battery using the battery check lamp and replace if necessary (/ page 66).
#
Use the emergency key to lock or unlock (/ page 66).
#
Have the SmartKey checked at a qualified specialist workshop.
You have lost a SmartKey.
#
Have the SmartKey deactivated at a qualified specialist workshop.
#
If necessary, have the mechanical lock changed as well.
68
Opening and closing
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