Mercedes-Benz E-Class Sedan Operator's Manual page 60

58 Opening and closing
Requirements
You require a CR 2032 3 V cell battery.
Mercedes-Benz recommends that you have the
battery replaced at a qualified specialist work‐
shop.
Remove the mechanical key (
#
Problems with the SmartKey
Problem
You can no longer lock or unlock the
vehicle.
Press release button
#
remove cover 1.
Remove battery compartment
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out the discharged battery.
Insert the new battery into battery compart‐
#
page 57).
ment 3. Observe the positive pole marking
→
in the battery compartment and on the bat‐
tery.
Push in battery compartment 3.
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Replace cover
#
Possible causes/consequences and
Possible causes are:
The SmartKey battery is discharged or nearly discharged.
R
There is interference from a powerful radio signal source.
R
2 down fully and
3 and take
1 so that it engages.
M Solutions