User Manual - Page 68

For 2020 C-Class Sedan C 300.

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Problem
Possible causes/consequences and M Solutions
R
The SmartKey is defective.
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Check the battery using the battery check lamp and replace if necessary (/ page 66).
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Use the emergency key to lock or unlock (/ page 66).
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Have the SmartKey checked at a qualified specialist workshop.
You have lost a SmartKey.
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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.
68
Opening and closing
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