Mercedes-Benz E CLASS 2020 Operator's Manual page 71

Problems with the SmartKey
Problem
You can no longer lock or unlock the
vehicle.
You have lost a SmartKey.
Possible causes/consequences and
Possible causes:
The SmartKey battery is discharged or nearly discharged.
R
There is interference from a powerful radio signal source.
R
The SmartKey is faulty.
R
Check the battery using the battery check lamp and replace if necessary (
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Use the emergency key to lock or unlock (
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Have the SmartKey checked at a qualified specialist workshop.
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Have the SmartKey deactivated at a qualified specialist workshop.
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If necessary, have the mechanical lock changed as well.
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M M Solutions
page 67).
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Opening and closing 69
page 67).
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