307 Practical hints
Unlocking/locking in an emergency
1Mechanical key
2Battery compartment
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove mechanical key1
(page 305).
Insert mechanical key1 in side
opening and push grey slide.
Battery compartment2 is unlatched.
Pull battery compartment2 out of the
SmartKey housing in direction of
arrow.
3Battery
4Contact spring
Remove the batteries.
Using a lint-free cloth, insert new
batteries under contact spring with the
plus (+) side facing up.
Return battery compartment2 into
housing until it locks into place.
Slide mechanical key1 back into the
SmartKey.
iWhen changing batteries, always
replace both batteries.
The required replacement batteries are
available at any Mercedes-Benz
Center.
iWhen inserting the batteries, make
sure they are clean and free of lint.
