Page 109 of 521

108 Controls in detailLocking and unlockingFactory settingGlobal unlocking
Press buttonŒ.
All turn signal lamps flash once.
An acoustic signal sounds once
(if equipped and feature activated).
The locking knobs in the doors
move up.
The anti-theft alarm system is dis-
armed.
The vehicle will lock again automatically
and reactivate the anti-theft alarm system
within approximately 40 seconds of un-
locking if:
neither a door nor the trunk is opened
the SmartKey is not inserted in the
starter switch
the central locking switch is not acti-
vatedGlobal locking
Press button‹.
All turn signal lamps flash three
times.
An acoustic signal sounds three
times (if equipped and feature acti-
vated).
The locking knobs in the doors
move down.
The anti-theft alarm system is
armed.
Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey so that
pressingŒ only unlocks the driver’s
door and the fuel filler flap.
Press and hold buttonsŒ and‹
simultaneously for about 5 seconds un-
til battery check lamp5 (
page 106)
flashes twice.
The SmartKey will then function as fol-
lows:
iYou can also open and close the power
windows and tilt/sliding sunroof* or
tilt/sliding panel* using the SmartKey
(page 234).
iYour vehicle may be equipped with an
acoustic lock and unlock confirmation
signal feature. If your vehicle is
equipped with this feature and the fea-
ture is activated, an acoustic signal will
sound when the vehicle is locked or un-
locked using the SmartKey.
To determine whether or not your vehi-
cle is equipped with this feature, con-
tact an authorized Mercedes-Benz
Center. If equipped and you wish to ac-
tivate or deactivate the feature, or ad-
just its signal volume, also contact an
authorized Mercedes-Benz Center.
Page 110 of 521

109 Controls in detail
Locking and unlocking
Unlocking driver’s door and fuel filler
flap
Press buttonŒ once.
All turn signal lamps flash once.
An acoustic signal sounds once
(if equipped and feature activated).
For more information, see “Factory
setting” (
page 108).
The locking knob in the driver’s
door moves up.
The anti-theft alarm system is dis-
armed.
Global unlocking
Press buttonŒ twice.
All turn signal lamps flash once.
An acoustic signal sounds once
(if equipped and feature activated).
The locking knobs in the doors
move up.
The anti-theft alarm system is dis-
armed.Global locking
Press button‹.
All turn signal lamps flash three
times.
An acoustic signal sounds three
times (if equipped and feature acti-
vated).
The locking knobs in the doors
move down.
The anti-theft alarm system is
armed.
Restoring to factory setting
Press and hold buttonsŒ and‹
simultaneously for about 6 seconds un-
til battery check lamp5 (
page 106)
flashes twice.
!If you can no longer lock or unlock the
vehicle with the SmartKey, then either
the batteries in the SmartKey are dis-
charged, the SmartKey is malfunction-
ing or the vehicle battery is drained.
Check the batteries in the
SmartKey (
page 110) and re-
place them if necessary
(
page 431).
Use the mechanical key to unlock
the driver’s door (
page 426) and
the trunk (
page 427).
Use the mechanical key to lock the
driver’s door (
page 426) and the
trunk (
page 128).
Have the vehicle battery and the
battery connections checked.
If the SmartKey is malfunctioning, con-
tact an authorized Mercedes-Benz
Center.
Page 111 of 521

110 Controls in detailLocking and unlockingChecking the batteries
Press button‹ orŒ.
Battery check lamp5 (
page 106)
comes on briefly to indicate that the
SmartKey batteries are in order.Unlocking and opening the trunk
You can unlock and open the trunk sepa-
rately.
A minimum height clearance of 5.90 ft
(1.80 m) is required to open the trunk lid.
Press and hold buttonŠ until the
trunk lid unlocks and begins to open.
The trunk can also be opened from its in-
side in an emergency, see “Trunk emer-
gency release” (
page 127).Loss of SmartKey or mechanical key
If you lose a SmartKey or mechanical key,
you should do the following:
Have the SmartKey deactivated by an
authorized Mercedes-Benz Center.
Report the loss of the SmartKey or the
mechanical key immediately to your
car insurance company.
If necessary, have the mechanical lock
replaced.
Your authorized Mercedes-Benz Center
will be glad to supply you with a replace-
ment.
iIf battery check lamp5 does not
come on briefly during check, then the
SmartKey batteries are discharged.
Replace the batteries (
page 431).
You can obtain the required batteries
at any authorized Mercedes-Benz
Center.
iIf the batteries are checked within sig-
nal range of the vehicle, pressing the
button‹ orŒ will lock or unlock
the vehicle accordingly.
!The trunk lid swings open upwards au-
tomatically. Always make sure there is
sufficient overhead clearance.
Vehicles with trunk opening/closing
system*: To stop the opening proce-
dure, press buttonŠ. The trunk lid
stops moving.iIf the trunk does not open, it is still
locked separately (
page 128).
iIf the vehicle was previously centrally
locked, the trunk will lock automatical-
ly after closing it.
To confirm locking all turn signal lamps
flash three times.
Page 115 of 521

114 Controls in detailLocking and unlockingFactory settingGlobal unlocking
Pull an outside door handle.
All turn signal lamps flash once.
An acoustic signal sounds once
(if equipped and feature activated).
The locking knobs in the doors
move up.
The anti-theft alarm system is dis-
armed.
The vehicle will lock again automatically
and reactivate the anti-theft alarm system
within approximately 40 seconds if:
neither a door nor the trunk is opened
the central locking switch is not acti-
vatedGlobal locking
Press lock button on an outside door
handle (
page 64) or trunk lid
(
page 117).
All turn signal lamps flash three
times.
An acoustic signal sounds three
times (if equipped and feature acti-
vated).
The locking knobs in the doors
move down.
The anti-theft alarm system is
armed.
iYour vehicle may be equipped with an
acoustic lock and unlock confirmation
signal feature. If your vehicle is
equipped with this feature and the fea-
ture is activated, an acoustic signal will
sound when the vehicle is locked or un-
locked using the SmartKey with
KEYLESS-GO.
To determine whether or not your vehi-
cle is equipped with this feature, con-
tact an authorized Mercedes-Benz
Center. If equipped and you wish to ac-
tivate or deactivate the feature, or ad-
just its signal volume, also contact an
authorized Mercedes-Benz Center.
Page 116 of 521

115 Controls in detail
Locking and unlocking
Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey with
KEYLESS-GO so when you pull the driver’s
outside door handle, only the driver’s door
and the fuel filler flap unlocks.
Press and hold buttonsŒ and‹
simultaneously for about 5 seconds un-
til battery check lamp5 (
page 111)
flashes twice.
The SmartKey with KEYLESS-GO will
then function as follows:Unlocking driver’s door and fuel filler
flap
Pull the driver’s outside door handle.
All turn signal lamps flash once.
An acoustic signal sounds once
(if equipped and feature activated).
For more information, see “Factory
setting” (
page 114).
The locking knob in the driver’s
door moves up.
The anti-theft alarm system is dis-
armed.Global unlocking
Pull any outside door handle other than
the driver’s outside door handle.
All turn signal lamps flash once.
An acoustic signal sounds once
(if equipped and feature activated).
The locking knobs in the doors
move up.
The anti-theft alarm system is dis-
armed.
Page 117 of 521

116 Controls in detailLocking and unlockingGlobal locking
Press lock button on an outside door
handle (
page 64) or lock button at
trunk lid (page 117).
All turn signal lamps flash three
times.
An acoustic signal sounds three
times (if equipped and feature acti-
vated).
The locking knobs in the doors
move down.
The anti-theft alarm system is
armed.
Restoring to factory setting
Press and hold buttonsŒ and‹
simultaneously for about 6 seconds un-
til battery check lamp5 (
page 111)
flashes twice.Checking the batteries
Press button‹ orŒ.
Battery check lamp5 (
page 111)
comes on briefly to indicate that the
SmartKey batteries are in order.
!If you can no longer lock or unlock the
vehicle with the SmartKey with
KEYLESS-GO, then the batteries in the
SmartKey are discharged, the
SmartKey with KEYLESS-GO is mal-
functioning or the vehicle battery is
drained.
Check the batteries in the
SmartKey with KEYLESS-GO
(page 116) and replace them if
necessary (
page 431).
Use the mechanical key to unlock
the driver’s door (
page 426) and
the trunk (
page 427).
Use the mechanical key to lock the
driver’s door (
page 426) and the
trunk (
page 128).
Have the vehicle battery checked
by an authorized Mercedes-Benz
Center.
If the SmartKey with KEYLESS-GO is
malfunctioning, contact an authorized
Mercedes-Benz Center.
!If battery check lamp5 does not
come on briefly during check, then the
SmartKey batteries are discharged.
Replace the batteries (
page 431).
You can obtain the required batteries
at any authorized Mercedes-Benz
Center.
iIf the batteries are checked within sig-
nal range of the vehicle, pressing the
button‹ orŒ will lock or unlock
the vehicle accordingly.
Page 118 of 521
117 Controls in detail
Locking and unlocking
Global locking using the lock button on
the trunk lid
1Lock button
Press lock button1 on the trunk lid.
All turn signal lamps flash three
times.
An acoustic signal sounds three
times (if equipped and feature acti-
vated).
For more information, see “Factory
setting” (
page 114).
The locking knobs in the doors
move down.
The anti-theft alarm system is
armed.
iTo prevent a possible inadvertent lock-
out, the trunk will open automatically if
a SmartKey with KEYLESS-GO is recog-
nized inside the vehicle or in the trunk.
iIf the vehicle was previously centrally
locked with KEYLESS-GO, the trunk will
lock automatically after closing it.
To confirm locking all turn signal lamps
flash three times.iYou can also lock the vehicle using the
lock button on an outside door handle
(page 64) or KEYLESS-GO locking/
closing switch (
page 126).
Page 119 of 521

118 Controls in detailLocking and unlockingUnlocking and opening the trunk
You can unlock and open the trunk sepa-
rately.
A minimum height clearance of 5.90 ft
(1.80 m) is required to open the trunk lid.
The handle is located in the rear license
plate recess.
Pull on the handle
or
Press and hold buttonŠ until the
trunk lid unlocks and begins to open.Loss of the SmartKey with KEYLESS-GO
If you lose your SmartKey with
KEYLESS-GO, you should do the following:
Have the SmartKey with KEYLESS-GO
deactivated by an authorized
Mercedes-Benz Center.
Report the loss immediately to your car
insurance company.
Have the mechanical lock replaced if
necessary.
Your authorized Mercedes-Benz Center
will be glad to supply you with a replace-
ment.
!The trunk lid swings open upwards au-
tomatically. Always make sure there is
sufficient overhead clearance.
Vehicles with trunk opening/closing
system*: to stop the opening proce-
dure, press buttonŠ. The trunk lid
stops moving.iIf the trunk does not open, it is still
locked separately (
page 128).
iIf the vehicle was previously centrally
locked with KEYLESS-GO, the trunk will
lock automatically after closing it.
To confirm locking all turn signal lamps
flash three times.