A- Class Owner's Manual - Page 68

For 2019 A 220 Sedan. Also, The document are for others Mercedes-Benz models: 2019 A- CLASS

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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 67).
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Use the emergency key to lock or unlock (/ page 67).
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Have the SmartKey checked at a qualified specialist workshop.
You have lost a Smar tKey.
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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.
Opening and closing
69
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