Page 65 of 288
Useful information ..............................64
SmartKey ............................................. 64
Doors .................................................... 69
Trunk .................................................... 73
Side windows ...................................... 75
Soft top (Roadster) .............................7863Opening/closing
Page 66 of 288

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Please read the information on qualified
specialist workshops ( Y page 21).
SmartKey
Key function
General notes
i USA 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.
The Product label with FCC ID and IC
certification number can be found in the
battery case of the SmartKey.
i Canada 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.
The Product label with FCC ID and IC
certification number can be found in the
battery case of the SmartKey.
Locking and unlocking centrally
The SmartKey centrally locks/unlocks:
R the doors
R the trunk lid
R the fuel filler flap
R the glove box
R the stowage/telephone compartment
under the armrest
GWARNING
If children are left unsupervised in the vehicle,
they could:
R open a door locked from inside the vehicle
R start the vehicle using a key which has been
left in the vehicle
R release the parking brake
They could thereby endanger themselves and
others. Never leave children unsupervised in
the vehicle. Always take the key with you
when leaving the vehicle, even if you are only
leaving it for a short time.
:& To lock the vehicle;F To unlock the trunk lid=% To unlock the vehicle
When unlocking, the turn signals flash once.
When locking, they flash three times.
64SmartKeyOpening/closing
Page 67 of 288

When it is dark, the surround lighting also
comes on if it is activated in the on-board
computer ( Y page 158).
You can also set an audible signal to confirm
that the vehicle has been locked or unlocked.
The audible signal can be activated and
deactivated using the on-board computer
( Y page 159).XTo unlock centrally: press the %
button.
If you do not open the vehicle within
approximately 40 seconds of unlocking:
R the vehicle is locked again.
R the anti-theft alarm system is armed again.
XTo lock centrally: press the & button.
Changing the settings of the locking
system
You can change the setting of the locking
system in such a way that only the driver's
door and the fuel filler flap are unlocked. This
is useful if you frequently travel on your own.
XTo change the setting: press and hold
down the % and & buttons
simultaneously for approximately six
seconds until the battery check lamp
( Y page 66) flashes twice.
The SmartKey now functions as follows:
XTo unlock the driver's door: press the
% button once.XTo unlock centrally: press the %
button twice.XTo lock centrally: press the & button.
Restoring the factory settings
XPress the % and & buttons
simultaneously for approximately six
seconds until the battery check lamp
flashes twice.Mechanical key
General notes
If the vehicle can no longer be locked or
unlocked with the SmartKey, use the
mechanical key.
If you use the mechanical key to unlock and
open the driver's door, the anti-theft alarm
system will be triggered ( Y page 59).
There are several ways to turn off the alarm:
XPress the % or & button on the
SmartKey.
or
XInsert the SmartKey into the ignition lock.XTo unlock the fuel filler flap: insert the
SmartKey into the ignition lock.
Removing the mechanical key
XPush release catch : in the direction of
the arrow and at the same time, remove
mechanical key ; from the SmartKey.
SmartKey battery
Important safety notes
It is advisable to have batteries replaced at a
qualified specialist workshop, e.g. at an
authorized Mercedes-Benz Center.
GWARNING
Batteries contain toxic substances.
SmartKey65Opening/closingZ
Page 68 of 288

Swallowing batteries can lead to serious
health issues or death.
Keep batteries out of the reach of children.
Seek medical attention immediately if a
battery is swallowed.GWARNING
The SmartKey batteries contain perchlorate
material, which may require special handling
and regard for the environment. Observe
government disposal guidelines. California
residents, see www.dtsc.ca.gov/
HazardousWaste/Perchlorate/
index.cfm .
Checking the battery
XPress the & or % button.
The SmartKey battery is working properly if
battery check lamp : lights up briefly.
If battery check lamp : does not light up
briefly during the test, the SmartKey battery
is discharged.
XChanging the battery ( Y page 66)
i
The battery can be obtained from any
authorized Mercedes-Benz Center.
i If the SmartKey battery is checked within
the signal range of the vehicle, pressing the
& or % button locks or unlocks the
vehicle.
Changing the batteryXTake the mechanical key out of the
SmartKey ( Y page 65).
You require a CR 2025 3 V cell battery.
XPress mechanical key ; into the opening
in the SmartKey in the direction of the
arrow until battery tray cover : opens. Do
not hold the cover closed while doing so.XRemove the cover of the battery tray.XRepeatedly tap the SmartKey against your
palm until battery = falls out.XInsert the new battery with the positive
terminal facing upwards. Use a lint-free
cloth to do so.XInsert the front tabs of the battery tray's
cover first, and then press to close it.XCheck the function of all SmartKey buttons
on the vehicle.66SmartKeyOpening/closing
Page 69 of 288

Problems with the SmartKeyProblemPossible causes/consequences and M SolutionsYou cannot lock or
unlock the vehicle
using the SmartKey.The SmartKey battery is discharged or nearly discharged.XPoint the tip of the SmartKey at the driver's door handle from
close range and try to unlock or lock the vehicle again.
If this does not work:
XUnlock the vehicle using the mechanical key ( Y page 65).XCheck the SmartKey battery and replace it if necessary
( Y page 66).The SmartKey is faulty.XLock or unlock the vehicle using the mechanical key
( Y page 65).XHave the SmartKey checked at a qualified specialist workshop.You have lost a
SmartKey.XHave the SmartKey canceled at an authorized Mercedes-Benz
Center.XReport the loss immediately to the vehicle insurers.XIf necessary, have the locks changed as well.You have lost the
mechanical key.XReport the loss immediately to the vehicle insurers.XIf necessary, have the locks changed as well.The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle.A door is open. Therefore, the SmartKey cannot be detected as
easily.XClose the door and try to start the vehicle again.There is interference from a powerful source of radio waves.XStart your vehicle with the SmartKey in the ignition lock.SmartKey67Opening/closingZ
Page 70 of 288

ProblemPossible causes/consequences and M SolutionsThe engine cannot be
started using the
SmartKey.The on-board voltage is too low.XSwitch off non-essential consumers, such as seat heating or
interior lighting, and try to start the engine again.XRemove the SmartKey and reinsert it into the ignition lock.XStart the engine within 30 seconds of inserting the SmartKey
into the ignition lock.XRepeat if necessary.
If this does not work:
XCheck the starter battery and charge it if necessary
( Y page 240).
or
XJump-start the vehicle ( Y page 243).
or
XConsult a qualified specialist workshop.The SmartKey cannot
be turned in the ignition
lock.The SmartKey has been in position 0 for a considerable time.XRemove the SmartKey and reinsert it into the ignition lock.XCheck the starter battery and charge it if necessary
( Y page 240).XStart the engine.The on-board voltage is too low.XSwitch off nonessential consumers, such as seat heating or
interior lighting, and try to turn the SmartKey again.
If this does not work:
XCheck the starter battery and charge it if necessary
( Y page 240).
or
XJump-start the vehicle ( Y page 243).
or
XConsult a qualified specialist workshop.68SmartKeyOpening/closing
Page 71 of 288

Doors
Important safety notes
GWARNING
When leaving the vehicle, always remove the
SmartKey from the ignition lock. Always take
the SmartKey with you and lock the vehicle.
Do not leave children unsupervised in the
vehicle, even if they are secured in a child
restraint system, and do not give them access
to an unlocked vehicle. A child's unsupervised
access to a vehicle could result in an accident
and/or serious personal injury. They could:
R injure themselves on vehicle parts
R be seriously or fatally injured by extreme
heat or cold
R injure themselves or have an accident with
vehicle equipment that may still be in
operation even after the SmartKey has
been removed from the ignition, such as the
seat adjustment, steering wheel
adjustment or memory function.
If children open a door, they could cause
severe or even fatal injury to other persons; if
they get out of the vehicle, they could injure
themselves when doing so or be seriously or
even fatally injured by any passing traffic.
Do not expose the child restraint system to
direct sunlight. The child restraint system's
metal parts, for example, could become very
hot, and a child could be burned on these
parts.
GWARNING
Do not carry heavy or hard objects in the
passenger compartment or trunk unless they
are firmly secured in place.
Unsecured or improperly positioned cargo
increases a child's risk of injury in the event
of
R strong braking maneuvers
R sudden changes of direction
R an accident
Unlocking and opening the doors
from the outside
Coupe
! The doors swing upwards and out when
opened. Therefore, make sure that there is
sufficient clearance above the vehicle.
XPoint the SmartKey towards door
handle :.XPress the % button on the SmartKey.
Door handle : moves out.XLift the door by door handle : and swing
it up as far as it will go.
Closing the door
XPull the door downwards by the outer edge
or the interior door handle. Swing the door
down gently and allow it to engage in the
lower position.XLock the vehicle with the SmartKey if
necessary ( Y page 64).
Roadster
XPoint the SmartKey towards the door
handle.XPress the % button on the SmartKey.
The door is unlocked and can be opened.XPull the door handle.Doors69Opening/closingZ
Page 72 of 288

Unlocking and opening doors from
inside
Coupe
You can only open a door from the inside if it
is unlocked.
The vehicle locks the doors automatically,
when you drive faster than 9 mph
(15 km/h).
The doors are automatically unlocked after a
journey if you switch off the engine.
! The doors swing upwards and out when
opened. Therefore, make sure that there is
sufficient clearance above the vehicle.
XTo unlock the door manually: press
the % button of central locking =.
or
XPull locking knob : upwards.XTo open the door: pull handle ;.XSwing the door upwards as far as it will go.XTo close the door: pull the door down by
handle ?.XAllow the door to engage in the lower
position.XTo lock the door manually: press
the & button of central locking =.
or
XPush locking knob : downwards.
Roadster
You can open a door from inside the vehicle
even if it has been locked.
Only open the door when the traffic situation
permits.XPull door handle ;.
If the door is locked, locking knob : pops
up. The door is unlocked and can be
opened.
i When a door is opened, the side window
on that side opens slightly. When the door
is closed, the side window closes again.
! The side windows will not open/close if
the battery is discharged or if the side
windows have iced up. It will then not be
possible to close the door. Do not attempt
to force the door closed. You could
otherwise damage the door or the side
window.
Centrally locking and unlocking the
vehicle from the inside (Roadster)
You can centrally lock or unlock the vehicle
from the inside. This feature may be useful if,
for example, you wish to unlock the front-
passenger door from the inside or lock the
vehicle before you pull away.
The central locking/unlocking button does
not lock or unlock the fuel filler flap.
The central locking/unlocking button does
not lock or unlock the fuel filler flap or the
stowage compartments, such as the glove
box.
70DoorsOpening/closing