299 Practical hints
Unlocking/locking in an emergency
Changing batteries
If the batteries in the SmartKey or the KEY-
LESS-GO* card are discharged, the vehicle
can no longer be locked or unlocked. It is
recommended to have the batteries re-
placed at an authorized 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
1Mechanical key
2Battery compartment
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove mechanical key1
(page 297).
Insert the mechanical key1 in side
opening and push gray slide2.
The battery compartment is unlatched.
Pull the battery compartment out of the
key housing in direction of arrow.
Remove the batteries.
3Battery
4Contact spring
Using a lint-free cloth, insert new
batteries3 under the contact spring4
with the plus (+) side facing up.
Return battery compartment into hous-
ing until it locks into place.
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.
300 Practical hintsUnlocking/locking in an emergencyKEYLESS-GO* card
1Battery cover
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Pry open cover 1 (e.g. by using a nar-
row blade screw driver).
Remove the batteries.
Install new batteries as indicated by
the “+” and “–” markings in the KEY-
LESS-GO card.
Replace battery cover 1.
Fuel filler flap
In an emergency, the fuel filler flap can
only be opened from the trunk. The release
knob is located on the right-hand side in
the trunk.
1Release knob
Open the trunk with the mechanical
key (
page 298).
Remove the battery cover and the trim
inside the trunk on the right-hand side.
Pull release knob 1 (arrow) flap.
The fuel filler flap can be opened.
