Page 105 of 489

104 Controls in detail
In the “Controls in detail” section you will
find detailed information on how to oper-
ate the equipment installed on your vehi-
cle. 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.
For more information on locking and un-
locking, see the “Getting started” section
(
page 38).
Locking and unlocking
SmartKey
Your vehicle comes supplied with two
SmartKeys, each with remote control and
a removable mechanical key.
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 lid
the glove box
the storage compartment under the
armrest
the storage compartment in the rear
the fuel filler flap
SmartKey with remote control
1‹Lock button
2Š Opening button for trunk
(
page 114)
3Mechanical key locking tab
4Œ Unlock button
5Battery check lamp
6Â Panic button (
page 88)
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105 Controls in detail
Locking and unlocking
Warning!G
When leaving the vehicle, always remove the
SmartKey from the starter switch, take it
with you, and lock the vehicle. Do not leave
children unattended in the vehicle, or with
access to an unlocked vehicle. A child’s
unsupervised access to a vehicle could
result in an accident and/or serious
personal injury.
!To prevent possible malfunction, avoid ex-
posing the SmartKey to high levels of electro-
magnetic radiation.
iUSA only:
This device complies with Part 15 of the
FCC Rules. Operation is subject to the following
two conditions:
(1) This device may not cause harmful
interference, and
(2) this device must accept any interference
received, including interference that may
cause undesired operation.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
iCanada only:
This device complies with RSS-210 of Industry
Canada. Operation is subject to the following
two conditions:
(1) This device may not cause interference, and
(2) this device must accept any interference
received, including interference that may
cause undesired operation of the device.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
iYou can also open and close the power win-
dows (
page 201) and the retractable hardtop
using the SmartKey (
page 206).
!If you cannot lock or unlock the vehicle
with the SmartKey, then the batteries in the
SmartKey are discharged, the SmartKey is mal-
functioning or the vehicle battery is drained.
Check the batteries in the SmartKey
(
page 113) and replace them if necessary
(
page 407).
Use the mechanical key to unlock the
driver’s door (
page 403) and the trunk
(
page 404).
Have the vehicle batteries and their
connections checked (
page 427).
Use the mechanical key to lock or unlock the
doors (
page 405).
If the SmartKey is malfunctioning, contact
Roadside Assistance or an authorized
Mercedes-Benz Center.
Page 107 of 489
106 Controls in detail
Locking and unlocking
Factory settingGlobal unlocking
Press button Œ.
All turn signal lamps flash once.
An acoustic warning sounds once.
The locking knobs in the doors
move up.
The anti-theft alarm system is
disarmed.
The vehicle will lock again automatically
and rearm the alarm system within approx-
imately 40 seconds of unlocking if:
neither door nor trunk is opened
the SmartKey is not inserted in the
starter switch
the central locking switch is not
activatedGlobal locking
Press button ‹.
With the trunk and both doors closed:
All turn signal lamps flash three
times.
An acoustic warning sounds three
times.
The locking knobs in the doors
move down.
The anti-theft alarm system is
armed.
iWhen unlocking or locking the vehicle with
the SmartKey, an acoustic signal sounds. The
signal is activated at the factory. If you wish to
deactivate the feature or adjust its signal
volume, contact an authorized Mercedes-Benz
Center.
Page 108 of 489

107 Controls in detail
Locking and unlocking
Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey so that press-
ing buttonŒ only unlocks the driver’s
door, interior lockable storage compart-
ments and the fuel filler flap.
Press and hold buttonsŒand‹
simultaneously for about 5 seconds
until battery check lamp5 flashes
twice.
The SmartKey will then function as
follows:Unlocking driver’s door and fuel filler
flap
Press button Œ once.
All turn signal lamps flash once.
An acoustic warning sounds once.
The locking knob in the driver’s
door moves up.
The anti-theft alarm system is
disarmed.
Global unlocking
Press button Œ twice.
All turn signal lamps flash once.
An acoustic warning sounds once.
The locking knobs in the doors
move up.
The anti-theft alarm system is
disarmed.Global locking
Press button ‹.
With all doors and the trunk closed:
All turn signal lamps flash three
times.
An acoustic warning sounds three
times.
The locking knobs in the doors
move down.
The anti-theft alarm system is
armed.
Restoring to factory setting
Press and hold buttons Œ and ‹
simultaneously for about 5 seconds
until battery check lamp5
(
page 104) flashes twice.
Page 109 of 489

108 Controls in detail
Locking and unlocking
SmartKey with KEYLESS-GO*
Vehicles equipped with KEYLESS-GO come
with two SmartKeys with KEYLESS-GO,
each with remote controls and a remov-
able mechanical key.
The function of the SmartKey overrules the
KEYLESS-GO function.
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 glove box
the storage compartment under the
armrest
the storage compartments in the rear
the fuel filler flap
SmartKey with KEYLESS-GO
1‹Lock button
2Š Opening button for trunk
(
page 114)
3Mechanical key locking tab
4ŒUnlock button
5Battery check lamp
6Â Panic button (
page 88)
For information on using the SmartKey
buttons, see “SmartKey” (
page 104).
Warning!G
When leaving the vehicle, always take the
SmartKey with KEYLESS-GO with you and
lock the vehicle. Do not leave children
unattended in the vehicle, or with access to
an unlocked vehicle. A child’s unsupervised
access to a vehicle could result in an
accident and/or serious personal injury.
!To prevent possible malfunction, avoid
exposing the SmartKey with KEYLESS-GO to
high levels of electromagnetic radiation.
iUSA only:
This device complies with Part 15 of the
FCC Rules. Operation is subject to the following
two conditions:
(1) This device may not cause harmful
interference, and
(2) this device must accept any interference
received, including interference that may
cause undesired operation.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
Page 110 of 489

109 Controls in detail
Locking and unlocking
Important notes on using KEYLESS-GO
You can also use the SmartKey with
KEYLESS-GO like a normal SmartKey
(
page 104).
You can combine KEYLESS-GO func-
tions with normal SmartKey functions
(e.g. unlocking with KEYLESS-GO and
locking with the ‹button).
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
Doing so could impair the function of
the KEYLESS-GO system.
iCanada only:
This device complies with RSS-210 of Industry
Canada. Operation is subject to the following
two conditions:
(1) This device may not cause interference, and
(2) this device must accept any interference
received, including interference that may
cause undesired operation of the device.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
iYou can also close the power windows
(
page 201) and the retractable hardtop using
the SmartKey with KEYLESS-GO (
page 206).
iWhen you unlock the vehicle, the
electro-hydraulic brake system is activated.
!If you cannot 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 malfunctioning or
the vehicle battery is drained.
Check the batteries in the SmartKey with
KEYLESS-GO (
page 113) and replace
them if necessary (
page 407).
Use the mechanical key to unlock the
driver’s door (
page 403) and the
trunk (
page 404).
Have the vehicle batteries and their
connections checked (
page 427).
Use the mechanical key to lock or unlock the
doors (
page 405).
If the SmartKey with KEYLESS-GO is malfunc-
tioning, contact Roadside Assistance or an
authorized Mercedes-Benz Center.
Page 111 of 489

110 Controls in detail
Locking and unlocking
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.
If the vehicle has been parked for more
than 72 hours, you must pull an outside
door handle in order to activate the
KEYLESS-GO function.
In order to start the engine with the
SmartKey with KEYLESS-GO:
The SmartKey with KEYLESS-GO
must be located in the vehicle.
All doors must be closed.
The brake pedal must be firmly
depressed. Do not depress the
accelerator.
If you have started the engine with the
KEYLESS-GO start/stop button
(
page 41), you can only turn it off
again with this button, even if you have
put the SmartKey in the starter switch
in the meantime.
This does not apply if, after starting, the
selector lever is still in positionP and
the SmartKey is then inserted in the
starter switch. The SmartKey will then
have priority over the KEYLESS-GO
function and the vehicle’s electrical
system will operate according 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 running (e.g. if passenger exits
the vehicle with the SmartKey with
KEYLESS-GO), the message
Key Not
Detected
will appear in the multifunc-
tion display while driving off.Find the SmartKey or change its
present location immediately (e.g.
place it on the 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 112 of 489

111 Controls in detail
Locking and unlocking
Factory settingGlobal unlocking
Grasp an outside door handle.
All turn signal lamps flash once.
An acoustic warning sounds once.
The locking knobs in the doors
move up.
The anti-theft alarm system is
disarmed.
The vehicle will lock again automatically
and rearm the alarm system within approx-
imately 40 seconds of unlocking if neither
a door nor the trunk is opened. Global locking
Press lock button on an outside door
handle (
page 66).
With the trunk and both doors closed:
All turn signal lamps flash three
times.
An acoustic warning sounds three
times.
The locking knobs in the doors
move down.
The anti-theft alarm system is
armed.
iWhen unlocking or locking the vehicle with
KEYLESS-GO, an acoustic signal sounds. The sig-
nal is activated at the factory. If you wish to de-
activate the feature or adjust its signal volume,
contact an authorized Mercedes-Benz Center.
iThe vehicle could inadvertently unlock if the
SmartKey with KEYLESS-GO is within 3 ft (1 m)
of the vehicle and
an outside door handle is splashed with
water
or
you attempt to clean an outside door handle
iVehicles with trunk opening/closing
system*: You can also lock the vehicle using the
the KEYLESS-GO locking/closing switch
(
page 119).