408 Practical hintsReplacing SmartKey batteriesIf the batteries in the SmartKey are dis-
charged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced at an autho-
rized Mercedes-Benz Center.
Batteries contain materials that can harm
the environment if disposed of improperly.
Recycling of batteries is the preferred
method of disposal. Many states require
sellers of batteries to accept old batteries
for recycling.
SmartKey
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key1
(page 402).
1Mechanical key
2Slide
3Battery compartment
Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.
iWhen inserting the batteries, make
sure they are clean and free of lint.iWhen replacing batteries, always
replace both batteries.
The required replacement batteries are
available at any Mercedes-Benz
Center.
409 Practical hints
Replacing SmartKey batteries
Insert the mechanical key1 in direc-
tion of arrow in side opening.
Using mechanical key1 push gray
slide2 to unlatch battery
compartment3.
Pull the battery compartment3 out of
the housing in direction of arrow.
4Battery
5Contact spring
Remove the batteries4 in direction of
arrow.
Using a lint-free cloth, insert new
batteries4 under the contact
spring5 with the plus (+) side facing
up.
Return battery compartment3 into
housing until it locks into place.
Slide mechanical key1 back into the
SmartKey.
Check the operation of the SmartKey.
SmartKey with KEYLESS-GO*
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove mechanical key (
page 402).
Insert the mechanical key3 in side
opening and push grey slide
(page 408).
Battery compartment is unlatched.
Pull battery compartment out of the
housing in direction of arrow
(page 408).
