Page 89 of 418

88 Controls in detailLocking and unlocking
In the “Controls in detail” section you will
find detailed information on how to oper-
ate the equipment installed in your vehicle.
If you are already familiar with the basic
functions of your vehicle, this section will
be of particular interest to you.
To quickly familiarize yourself with the ba-
sic functions of the vehicle, refer to the
“Getting started” section of this manual.
The corresponding page numbers are giv-
en at the beginning of each segment.
Locking and unlocking
SmartKey
Your vehicle comes supplied with two
SmartKeys, each with remote control and
a removable mechanical key. The locking
tabs for the mechanical key portion of the
two SmartKeys are a different color to help
distinguish each SmartKey unit.
The SmartKey provides an extended oper-
ating range. To prevent theft, however, it is
advisable to only unlock the vehicle when
you are in close proximity to it.
The SmartKey centrally locks and unlocks:
the doors
the trunk
the fuel filler flap
SmartKey with remote controls1‹ Lock button
2Š Unlock button for trunk lid
3Locking tab for mechanical key
4Œ Unlock button
5Battery check lamp
6Â Panic button (
page 76)
Page 90 of 418

89 Controls in detail
Locking and unlocking
Factory setting
Global unlocking
Press buttonŒ.
All turn signal lamps flash once. The
locking knobs in the doors move up.
The vehicle will lock again automatically
within approximately 40 seconds of un-
locking if:
neither door nor trunk is opened
the SmartKey is not inserted in the
starter switch
the central locking switch is not acti-
vated
Global locking
Press button‹.
All turn signal lamps flash three times.
The locking knobs in the doors move
down.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 six seconds
until battery check lamp5 flashes
twice.
The SmartKey will then function as fol-
lows:
Unlocking driver’s door and fuel filler
flap
Press buttonŒ once.
Global unlocking
Press buttonŒ twice.
Global locking
Press button‹.
Warning!
G
When leaving the vehicle, always remove the
SmartKey from the starter switch, take the
SmartKey with KEYLESS-GO* with you and
lock your vehicle. Do not leave children un-
attended in the vehicle, or with access to an
unlocked vehicle. It is possible for children
to open a locked door from the inside, which
could result in an accident and/or serious
personal injury.!To prevent possible malfunction, avoid
exposing the SmartKey to high levels of
electromagnetic radiation.iYou can also open and close the power
windows (
page 188) and slid-
ing/pop-up roof (
page 193) using
the SmartKey.
Page 91 of 418

90 Controls in detailLocking and unlockingRestoring to factory setting
Press and hold buttonsŒ and‹
simultaneously for about six seconds
until battery check lamp5 flashes
twice.
Unlocking and opening the trunk lid
You can unlock and open the trunk lid sep-
arately.
A minimum height clearance of 6.3 ft
(1.90 m) is required to open the trunk lid.
Press and hold buttonŠ until trunk
unlocks and begins to open.The trunk can also be opened from its in-
side in an emergency, see “Trunk lid emer-
gency release” (
page 103).
!If you can no longer lock or unlock the
vehicle with the SmartKey, then 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 and replace them if nec-
essary (
page 332).
Use the mechanical key to unlock
the doors (
page 331) and the
trunk lid (
page 332) as required.
Have the vehicle battery and the
battery connections checked.
Use the mechanical key to lock the
doors (
page 331) and the trunk
lid (
page 332) as required.
If the SmartKey is malfunctioning, con-
tact an authorized Mercedes-Benz Cen-
ter.
!The trunk lid swings open upwards au-
tomatically. Always make sure that
there is sufficient overhead clearance.
Vehicles with trunk lid 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 (if applicable)
(page 104).
If the vehicle was previously centrally
locked, the trunk lid will lock automati-
cally when closed (
page 98). The
turn signals will flash three times to
confirm locking.
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91 Controls in detail
Locking and unlocking
Checking the batteries
Press button‹ orŒ.
Battery check lamp5 comes on brief-
ly to indicate that the SmartKey batter-
ies are in order.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.
SmartKey with KEYLESS-GO*
Vehicles equipped with KEYLESS-GO come
with two SmartKeys with KEYLESS-GO,
each with remote control and a removable
mechanical key. The locking tabs for the
mechanical key portion of the two
SmartKeys are a different color to help dis-
tinguish each SmartKey unit.
The KEYLESS-GO function is integrated
into the SmartKey. On these vehicles, the
validity of the SmartKey with KEYLESS-GO
is checked every time you grasp a door
handle.
If the SmartKey with KEYLESS-GO is valid,
your vehicle unlocks:
the doors
the trunk lid
the fuel filler flap
!If battery check lamp5 does not
comes on briefly during check, then the
SmartKey batteries are discharged.
Replace the batteries (
page 332).
You can obtain the required batteries
at any authorized Mercedes-Benz Cen-
ter.
iIf the batteries are ckecked within sig-
nal range of the vehicle, pressing the
button‹ orŒ will lock or unlock
the vehicle accordingly.
Page 93 of 418

92 Controls in detailLocking and unlockingSmartKey with KEYLESS-GO1‹ Lock button
2Š Unlock button for trunk lid
3Locking tab for mechanical key
4Œ Unlock button
5Battery check lamp
6Â Panic button (
page 76)
For more information on using the
SmartKey buttons, see “SmartKey”
(
page 88).Important notes on using KEYLESS-GO
You can also use the SmartKey with
KEYLESS-GO like a normal
SmartKey (
page 88).
You can combine KEYLESS-GO func-
tions with normal SmartKey functions
(e.g. unlocking with KEYLESS-GO and
locking with the remote control).
Always carry the SmartKey with
KEYLESS-GO with you.
Never store the SmartKey with
KEYLESS-GO together with:
Electronic items such as a cellular
phone or another SmartKey with
KEYLESS-GO
Metallic objects such as coins or
metal foil
Warning!
G
When leaving the vehicle, always remove the
SmartKey from the starter switch, take the
SmartKey with KEYLESS-GO* with you and
lock your vehicle. Do not leave children un-
attended in the vehicle, or with access to an
unlocked vehicle. Unsupervised use of vehi-
cle equipment may cause an accident
and/or serious personal injury.!To prevent possible malfunction, avoid
exposing the SmartKey with
KEYLESS-GO to high levels of electro-
magnetic radiation. iIf the vehicle has been parked for a
longer period of time, you must pull the
door handle in order to activate the
KEYLESS-GO function.
You can also close the power windows
(page 188) and sliding/pop up roof
(page 193) using the SmartKey with
KEYLESS-GO.
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93 Controls in detail
Locking and unlocking
Doing so could impair the function of
the KEYLESS-GO system.
To lock or unlock the vehicle, the
SmartKey with KEYLESS-GO must be
located outside the vehicle within ap-
proximately 3 ft. (1 m) of a door or the
trunk lid.
In order to start the engine with the
SmartKey with KEYLESS-GO:
The SmartKey with KEYLESS-GO
must be located in the vehicle.
All the doors must be closed.
The brake pedal must be firmly dep-
resed. Do not depress the accelera-
tor.
If you have started the engine with the
KEYLESS-GO start / stop button, you
can only turn it off again with this but-
ton, even if you have put the SmartKey
in the starter switch in the meantime.
This does not apply if, after starting, the
gear selector lever is still in positionP
and the SmartKey is then inserted in
the starter switch. The SmartKey will
then have priority over the SmartKey
with KEYLESS-GO and the vehicle’s
electrical system will operate accord-
ing to the position of the SmartKey in
the starter switch, even stopping the
engine.
If the SmartKey with KEYLESS-GO is
positioned farther away from the vehi-
cle, the system may no longer recog-
nize the SmartKey with KEYLESS-GO.
The vehicle then cannot be locked or
the engine started via the KEYLESS-GO
system.
If the SmartKey with KEYLESS-GO is re-
moved from the vehicle while the en-
gine is switched on (e.g. if passenger
exits the vehicle with the SmartKey
with KEYLESS-GO), the message
KEY
NOT RECOGNIZED!
will appear in the
multifunction display.
Find the SmartKey or change its
present location immediately
(e.g. place it on the front passenger
seat or insert it in shirt pocket).
Remember that the engine can be
started by anyone with a SmartKey
with KEYLESS-GO that is left inside the
vehicle. If you leave the SmartKey with
KEYLESS-GO behind when exiting and
locking the vehicle, the message
KEY
DETECTED IN VEHICLE!
will appear in
the multifunction display.
Page 95 of 418

94 Controls in detailLocking and unlockingFactory setting
Global unlocking
Grasp the door handle.
The vehicle will lock again automatically
within approximately 40 seconds of un-
locking if neither door nor trunk is opened.
Global locking
Press lock button at door handle
(page 57) or trunk (
page 95).Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey with
KEYLESS-GO so when you, grasp the driv-
er’s door handle only the driver’s door and
the fuel filler flap unlocks.
Press and hold buttonsŒ and‹
simultaneously for about six seconds
until battery check lamp5 flashes
twice.
The SmartKey with KEYLESS-GO will
then function as follows:
Unlocking the driver’s door
Grasp the driver’s door handle.
Global unlocking
Grasp the door handle on the pas-
senger side.
Global locking
Press lock button at door handle or
trunk.Restoring to factory setting
Press and hold buttonsŒ and‹
simultaneously for about six seconds
until battery check lamp5 flashes
twice.
iThe vehicle could be inadvertently be
unlock if the SmartKey with
KEYLESS-GO is within 3 ft. (1 m) of the
vehicle and
the door handle is splashed with
water, or
you attempt to clean the door
handle.
!If you cannot lock or unlock the vehicle
with the SmartKey with KEYLESS-GO,
then the battery of the SmartKey is dis-
charged, the SmartKey is malfunction-
ing or the vehicle battery is drained.
Check the battery of the SmartKey
with KEYLESS-GO and replace them
if necessary (
page 332).
Use the mechanical key to unlock
the doors (
page 331) and the
trunk lid (
page 332) as required.
Have the vehicle battery and the
battery connections checked.
Use the mechanical key to lock the
doors (
page 331) and the trunk
lid (if applicable) (
page 332) as
required.
Page 96 of 418

95 Controls in detail
Locking and unlocking
Locking the vehicle
1Vehicle lock button
Press vehicle lock button1.
or
Press the lock button at the outside
door handle (
page 57).
or
Vehicles with trunk lid opening/closing
system*, press the KEYLESS-GO lock-
ing/closing switch at the trunk
(page 102).
The vehicle locks. The turn signals
flashes three times to confirm locking.
Checking the battery
Press button‹ orŒ.
Battery check lamp5 comes on brief-
ly to indicate that the SmartKey battery
is in order.Loss of the SmartKey with KEYLESS-GO
If you lose your SmartKey with
KEYLESS-GO or mechanical key you
should do the following:
Have the SmartKey with KEYLESS-GO
deactivated by an authorized
Mercedes-Benz Center.
Report the loss of the SmartKey with
KEYLESS-GO or the mechanical key im-
mediately to your car insurance com-
pany.
Have the mechanical lock replaced if
necessary.
Your authorized Mercedes-Benz Center
will be glad to supply you with a replace-
ment. 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, the
SmartKey battery is discharged.
Peplace the battery (
page 332).
You can obtain the required battery at
any authorized Mercedes-Benz Center.
iIf the battery is ckecked within signal
range of the vehicle, pressing the
button‹ orŒ will lock or unlock
the vehicle accordingly.