Page 105 of 521
104 Safety and SecurityAnti-theft systemsDisarming tow-away alarm
To prevent triggering the tow-away alarm
feature, switch off the tow-away alarm be-
fore towing the vehicle, or when parking on
a surface subject to movement, such as a
ferry or auto train.
The button is located on the overhead con-
trol panel.
1Tow-away alarm off button
Switch off the ignition and remove the
SmartKey from the starter switch.
Press button1.
The indicator lamp in the button1
comes on briefly.
Exit and lock the vehicle with the
SmartKey or (vehicles with
KEYLESS-GO*) the lock button at each
door handle.Canceling tow-away alarm
With the SmartKey
Insert the SmartKey in the starter
switch.
or
Press button Œ or ‹ on the
SmartKey.
With KEYLESS-GO*
Pull an outside door handle.
The SmartKey with KEYLESS-GO must
be within 3 ft (1 m) of the vehicle.
or
Press the KEYLESS-GO* start/stop
button (
page 38).
The SmartKey with KEYLESS-GO must
be inside the vehicle.
iYou cannot disarm the tow-away alarm
when the ignition is switched on.
iWhen you unlock the vehicle, the
tow-away protection disarms automati-
cally.
The tow-away alarm remains disarmed
until you lock the vehicle again.
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 buttonΠonce.
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 buttonΠtwice.
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 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 120 of 521
119 Controls in detail
Locking and unlocking
Opening the doors from the inside
You can open a locked door from the in-
side. Open door only when conditions are
safe to do so.
1Locking knob
2Inside door handleFront doors
Pull on door handle2 on the respec-
tive front door to open door.
If door was locked, locking knob1 will
move up.
Rear doors
Pull up locking knob1 on the
respective rear door to unlock door.
Pull on door handle2 on the
respective rear door to open door.
iIf the vehicle has previously been
locked with the SmartKey or
KEYLESS-GO*, opening a door from the
inside will trigger the anti-theft alarm
system.
To cancel the alarm, do one of the fol-
lowing:
Press button Œ or ‹ on the
SmartKey.
Insert the SmartKey in the starter
switch.
In vehicles with KEYLESS-GO*
Press the KEYLESS-GO* start/stop
button (
page 37).
The SmartKey with KEYLESS-GO
must be inside the vehicle.
Pull an outside door handle.
The SmartKey with KEYLESS-GO
must be within 3 ft (1 m) of the ve-
hicle.
