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380 Practical hintsUnlocking/locking in an emergency1Locking
Insert the mechanical key into the
driver’s door lock until it stops.
Turn the mechanical key clockwise to
The driver’s door is locked.
Fuel filler flap
In case the central locking system does
not release the fuel filler flap, you can open
The release button is on the right-hand
side of the luggage compartment behind
the side trim.1Side trim
Open the trunk lid.
Remove the side trim1 from the
right-hand side of the luggage compart-
Turn release button2 clockwise as far
as will go.
The fuel filler flap is released.
Open the fuel filler flap from outside.
If you operate the emergency release but-
ton, be careful of the sharp edges so that
you do not injure yourself.
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381 Practical hints
Unlocking/locking in an emergency
Manually unlocking the transmission gear selector lever
In the case of power failure the transmis-
sion gear selector lever can be manually
unlocked, e.g. to tow the vehicle.
Slide out the swiveling cup holder
Insert a tool1 (e.g. flat blade
screwdriver) into the opening.
Perform the following two steps
Press tool1 forward in the
direction of the arrow.
Move gear selector lever from
Remove tool1 from the opening.iThe gear selector lever is locked again
when moving it to positionP.
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382 Practical hintsOpening/closing in an emergencyPower tilt/sliding sunroof*
You can open or close the tilt/sliding
sunroof manually should an electrical
The tilt/sliding sunroof drive is located
behind the lens1 of the interior overhead
Remove SmartKey from the starter
Pry of lens1 using a flat blade
Slide both locking tabs2 in direction
of the arrows.
Lower the rear of the cover and
Remove the cover.
Take the crank3 out of the Operator’s
Insert crank3 through hole on the left
Turn crank3 clockwise to:
slide sunroof closed
raise sunroof at the rear
Turn crank3 counterclockwise to:
slide sunroof open
lower sunroof at the rear
iDo not disconnect electrical
iTurn crank3 slowly and smoothly.
The tilt/sliding sunroof must be
synchronized after being operated
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383 Practical hints
Replacing SmartKey batteries
Replacing SmartKey batteries
If the batteries in the SmartKey are
discharged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced 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
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
iWhen inserting the batteries, make
sure they are clean and free of lint.iWhen replacing batteries, always
replace both batteries.
The required replacement batteries are
available at any Mercedes-Benz
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384 Practical hintsReplacing SmartKey batteriesSmartKey
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key
Insert mechanical key1 in side
opening and push grey slide.
Battery compartment2 is unlatched.
Pull battery compartment2 out of the
housing in direction of arrow.
Remove the batteries.
Using a lint-free cloth, insert new
batteries3 under contact spring4
with the plus (+) side facing up.
Return battery compartment2 into
housing until it locks into place.
Slide mechanical key1 back into the
Check the operation of the SmartKey.