293 Practical hints
Locking/unlocking in an emergency
Changing batteries
If the batteries in the key 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.Key
1Mechanical key
2Unlatching battery compartment
3Pulling out battery compartment
4Mechanical key locking tab
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key1
(page 290).
Insert the mechanical key in side open-
ing and push gray slide in direction of
arrow2.
The battery compartment is unlatched.
Pull the battery compartment out of the
key housing in direction of arrow3.
Remove the batteries.
5Battery
6Contact spring
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 locked in 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 re-
placement batteries are available at
any Mercedes-Benz Center.
294 Practical hintsLocking/unlocking in an emergencyKEYLESS-GO card*
1Battery cover
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Pry open the cover 1.
Remove the batteries.
Install new batteries as indicated by
the “+” and “-” markings in the KEY-
LESS-GO card.
Replace battery cover 1.
