User Manual - Page 73

For 2020 C-CLASS.

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Problems with KEYLESS-GO
Problem
Possible causes/consequences and
MM Solutions
You can no longer lock or unlock the
vehicle using KEYLESS-GO.
Possible causes are:
R
The key functions have been deactivated (/ page 65).
R
The SmartKey battery is discharged or nearly discharged.
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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