389 Practical hints
Replacing SmartKey batteries
Replacing SmartKey batteries
If the batteries in the SmartKey or the
SmartKey with KEYLESS-GO* 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 mechanical key1
(page 385).
1Mechanical key
2Slide
3Battery compartment
Insert mechanical key1in direction
of arrow into side opening.
Using mechanical key1, push gray
slide2to unlatch battery compart-
ment 3.
Pull battery compartment3out of the
housing in direction of arrow.
Remove the batteries in direction of ar-
row.
4Battery
5Contact spring
Using a lint-free cloth, insert new bat-
teries 4 under contact spring 5 with
the positive terminal (+) facing up.
Return battery compartment 3 into
housing until it locks into place.
Slide mechanical key 1 back into the
SmartKey.
Check the operation of the SmartKey.
Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.iWhen inserting batteries, make sure
they are clean and free of lint.
390 Practical hintsReplacing SmartKey batteriesSmartKey with KEYLESS-GO*
Replacement battery: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key
(page 385).
Take the battery compartment out of
the SmartKey housing (
page 389).1Battery
2Tilt battery up
3Mechanical key
Using mechanical key3, apply pres-
sure to position 2.
Battery 1 tilts up slightly.
Pull out battery 1 in direction of ar-
row.
Using a lint-free cloth, insert the new
battery under the contact spring with
the plus (+) side facing up.
Return the battery compartment into
the housing until it locks into place.
Slide mechanical key 1 back into the
SmartKey, see “SmartKey”
(page 389).
Check the operation of the SmartKey
with KEYLESS-GO.
iWhen replacing batteries, always re-
place both batteries. The required re-
placement batteries are available at
any authorized Mercedes-Benz Center.
