Mercedes-Benz E-Class Coupe 2021 Operator's Manual page 70

68 Opening and closing
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 emergency key (
/
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Press release knob 2 down fully and slide
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cover 1 in the direction of the arrow.
Fold out cover 1 in the direction of the
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arrow and remove.
Remove battery compartment 3
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out the discharged battery.
Insert the new battery into battery compart‐
#
ment 3. Observe the positive pole marking
in the battery compartment and on the bat‐
tery when doing this.
Push in battery compartment 3.
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Re-attach cover
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page 67).
engages.
Problems with the SmartKey, troubleshoot‐
ing
You can no longer lock or unlock the vehicle
Possible causes:
The SmartKey battery is weak or discharged.
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The SmartKey is faulty.
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Check the battery using the indicator lamp
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( page 64).
/
Replace the SmartKey battery, if necessary
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( page 67).
/
Use the emergency key to lock or unlock
#
and take
( page 71).
/
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There is interference from a powerful radio
signal source
The SmartKey function is impaired by, for exam‐
1 and push it until it
ple:
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R
R
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#
You have lost a SmartKey
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#
Have the SmartKey checked at a qualified
specialist workshop.
High voltage power lines
Mobile phones
Electronic devices (notebooks, tablets)
Shielding due to metal objects or induction
loops for electrical gate systems or auto‐
matic barriers
Make sure that there is sufficient distance
between the SmartKey and the potential
source of interference.
Have the SmartKey deactivated at a qualified
specialist workshop.
If necessary, have the mechanical lock
replaced as well.