286 Practical hintsUnlocking/locking in an emergencyLocking the vehicle
If you are unable to lock the vehicle with
the SmartKey, lock it with the mechanical
key as follows:
Close the passenger doors and the
trunk.
Press the central locking switch in the
cockpit (
page 92).
Check to see whether the locking
knobs on the passenger doors are still
visible. If necessary push them down
manually.
Lock the driver’s door with the me-
chanical key (
page 285).
Check if the trunk is locked. If neces-
sary lock the trunk with the mechanical
key (
page 90).
Changing batteries
If 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.Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.
iWhen changing batteries, always re-
place both batteries.
The required replacement batteries are
available at any Mercedes-Benz
Center.
287 Practical hints
Unlocking/locking in an emergency
SmartKey
1Mechanical key
2Battery compartment
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove mechanical key1
(page 285).
Insert the mechanical key in side open-
ing and push gray slide.
The battery compartment2 is un-
latched.
Pull the battery compartment2 out of
the key housing in direction of arrow.3Battery
4Contact spring
Remove the batteries.
Using a lint-free cloth, insert new bat-
teries under the contact spring with the
plus (+) side facing up.
Return battery compartment into hous-
ing until it locks into place.
Fuel filler flap
Open trunk lid.
Fold away right-side tail lamp trim.
Reach inside through opening2.
Turn release knob1 clockwise (arrow).
The fuel filler flap can now be opened.
