Mercedes-Benz S-Class 2019 Operator's Manual page 67

Requirements:
You require a CR 2032 3 V cell battery.
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Mercedes-Benz recommends that you have the
battery replaced at a qualified specialist work‐
shop.
Remove the mechanical key (
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Problems with the SmartKey
Problem
You can no longer lock or unlock the
vehicle.
Press release button
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remove cover 1.
Remove battery compartment
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out the discharged battery.
Insert the new battery into battery compart‐
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ment 3. Observe the positive pole marking
page 64).
→
in the battery compartment and on the bat‐
tery.
Push in battery compartment 3.
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Replace cover
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Possible causes/consequences and
Possible causes are:
The SmartKey battery is discharged or nearly discharged.
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There is interference from a powerful radio signal source.
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2 down fully and
3 and take
1 so that it engages.
M M Solutions
65
Opening and closing