
Problem
Possible causes/consequences and
0050
0050Solutions The engine cannot be
started using the
SmartKey. The on-board voltage is too low.
X Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
X Remove the SmartKey and reinsert it into the ignition lock.
X Start the engine within 30 seconds of insertingt he SmartKey
into the ignition lock.
X Repeatifn ecessary.
If this does not work: X Check the starter battery and charge it if necessary
(Y page 238).
or
X Jump-start the vehicle (Y page 242).
or
X Consult aqualified specialist workshop. The SmartKey cannot
be turned in the ignition
lock. The SmartKey has been in position
0for aconsiderable time.
X Remove the SmartKey and reinsert it into the ignition lock.
X Check the starter battery and charge it if necessary
(Y page 238).
X Start the engine. The on-board voltage is too low.
X Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to turn the SmartKey again.
If this does not work:
X Check the starter battery and charge it if necessary
(Y page 238).
or
X Jump-start the vehicle (Y page 242).
or
X Consult aqualified specialist workshop. SmartKey
67Opening and closing Z

X
To clos ethe door: pull the door down-
wards by the outer edge or the interio rdoor
handle. Swing the door down gently and
allo wittoe ngageint he lowe rposit ion.
X Lock the vehicl ewitht he SmartKe yifnec-
essar y(Ypage 62).
Roadster X
To ope nthe door: point the SmartKey
towards door handle.
X Press the 0036button on the SmartKey.
The door is unlocke dand can be opened.
X Pull the door handle. Unlockin
gand opening doors from
the inside
Coupe Yo
uc an onl yopenad oorfrom the insid eifit
is unlocked.
The vehicl eloc ks the doors automaticall yif
yo ud rive faster tha n9mph (15 km/h).
The doors ar eautomaticall yunlocke dafter a
journey if yo uswitch off the engine.
! The doors swing upwards and ou
twhen
opened. Therefore ,makes uret hatther eis
sufficient clearance above the vehicle. X
To unloc kthe doo rmanually: press
the 0036 button of centra lloc king 0087.
or X Pull locking knob 0043upwards. X
To ope nthe door: pull handle 0044.
X Swing the door upwards as fa rasitwillg o.
X To clos ethe door: pull the door down by
handle 0085.
X Allow the door to engag einthe lowe rposi-
tion.
X To lock the doo rmanually: press
the 0037 button of centra lloc king 0087.
or X Push locking knob 0043downwards.
Roadster Yo
uc an open adoorfrom insid ethe vehicle
eve nifith asbeen locked.
Onl yopent he door when the traffic situation
permits. X
Pull door handle 0044.
If the door is locked ,loc king knob 0043pops
up .The door is unlocke dand can be
opened.
i Whe
nad ooriso pened, the side window
on tha tsideo pens slightly. Whe nthe door
is closed ,the side windo wcloses again.
! The side windows will not open/close if
the battery is discharge dorifthe side win-
dows have ice dup.It will then not be pos-
sibl etoc lose the door. Do not attempt to
forc ethe door closed .You could otherwise
damage the door or the side window. Doors
69Opening and closing Z

The trunk lid emergenc
yrelease does not
unlock the trunk lid if the battery is discon-
nected or discharged.
If the vehicle was locked centrally, opening
the trunk lid with the trunk lid emergency
release triggers the anti-theft alarm system. Side windows
Important safety notes
G
WARNING
While opening the side windows, body parts
could become trapped between the side win- dow and the door frame as the side window
moves. There is arisk of injury.
Make sure that nobody touches the side win-
dow during the opening procedure. If some-
body becomes trapped, release the switch or pull the switch to close the side window again. G
WARNING
While closing the side windows, body parts in the closing area could become trapped. There is ar isk of injury.
When closing make sure that no parts of the
body are in the closing area. If somebody
becomes trapped, release the switch or press
the switch to open the side window again. G
WARNING
If children operate the side windows they
could become trapped, particularly if they are left unsupervised. There is arisk of injury.
When leaving the vehicle, alway stake the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
The side windows are equipped with an auto-
matic reversin gfeature. If an object blocks or
restricts aside window during the closing
process, the side window opens again auto-
matically. G
WARNING
The reversin gfeature does not react:
R to soft, light and thin objects, e.g. small fin-
gers
R over the last 4mmofthe closing movement
R during resetting
R when closing the side window again man-
ually immediately after automatic reversing
This means that the reversin gfeature cannot
prevent someone being trapped in these sit-
uations. There is arisk of injury.
Make sure that no body parts are in close
proximit yduring the closing procedure. If
someone becomes trapped, press the switch
to open the side window again.
Observe the importan tsafety notes in the
"Children in the vehicle" section (Y page 51). Opening and closing the side win-
dows
0043
Left side window
0044 Right side window
The switches for both side windows are
located on the driver's door. There is also a
switch for the front-passenger side window
on the front-passenger door.
The switches on the driver's door take prec-
edence. Side windows
75Opening and closing Z

0043
To adjust the upper back support
0044 To adjust the contour of the backrest in
the lumbar region
0087 To adjust the lateral structure and support
of the seat
X Select key position 2with the Start/Stop
button.
i If, after
acertain amount of time, the seat
no longer has the desired contour, repeat
the adjustment. Switching the seat heating on/off
Activating/deactivating G
WARNING
Repeatedly switchin gonthe seat heating can
cause the seat cushion and backrest pads to
become very hot. The health of persons with
limited temperature sensitivity or alimited
ability to react to excessively high tempera-
tures may be affected or they may even suffer burn-lik einjuries. There is arisk of injury.
Therefore, do not switch the seat heating on
repeatedly.
The three red indicator lamps in the button
indicate the heating level you have selected.
i If the battery voltage is too low, the seat
heating may switch off. The system automatically switches down
from level
3to level 2after approximately five
minutes.
The system automatically switches down
from level 2to level 1after approximately ten
minutes.
The system automatically switches off
approximately 20 minutes after it is set to
level 1.
X Select key position 2with the Start/Stop
button.
X To switch on: press button0043repeatedly
until the desired heating level is set.
X To switch off: press button0043repeatedly
until all the indicator lamps go out.
Problems with the seat heating The seat heating has switched off prema-
turely or cannot be switched on. The vehicle's
electrical system voltage is too low because
too many electrical consumers are switched
on.
X Switc hoff electrical consumers that you do
not need, such as the rear window
defroster or interior lighting.
Oncet he battery is sufficiently charged, the
seat heating will switch back on automati-
cally. Seats
87Seats, steering wheel and mirrors Z

AIRSCARF (Roadster)
G
WARNING
When AIRSCARF is switched on ,veryh ot air
can flo wfromt hevents in th ehead restraints.
This could result in burn sintheimmediate
vicinity of th eair vents .There is ariskofi njury.
Reduc ethe heater output before it becomes
to oh ot.
The AIRSCARF function warm sthe head and
neck area of vehicl eoccupant swithw arm air.
The warm air flows out of th ehole sint hehead
restraints.
The three red indicator lamp sinthebutton
indicat ethe heating level you hav eselected. X
Mak esuret hatthe SmartKey is in position
2 in th eignition lock.
X To switch on: press button0043.
Three red indicator lamp sinthebutto nlight
up. The blowe rstartsupa fterapreheating
phas eofs even seconds.
X Press button 0043repeatedly until the
desired heating level is set.
X To switch off: press button0043repeatedly
until all th eindicator lamp sgoout.
You can use th eadjustable fin sonthehead
restrain ttoadjust th eheight of th ecurren tof
air blown out according to your height.
Mak esuret hatthe re are no objects covering
th ei ntake grille on th ebackoft hedriver's
seat backrest. i
The blowe
rcontinue srunnin gfor seven
seconds to cool down th eheating ele-
ments.
i If th
ebattery voltag eistoolow, AIRSCARF
may switch off. Steering wheel
Important safety notes
G
WARNING
You could lose control of your vehicl eifyou do
th ef ollowin gwhile driving:
R adjust th edriver's seat ,head restraint,
steering whee lormirrors
R faste nthe seat belt
There is ariskofana ccident.
Adjus tthe driver's seat ,head restraint, steer-
ing whee land mirror and faste nyour seat belt
before starting th eengine. G
WARNING
Children could injure themselves if they
adjust th esteering wheel. There is ariskof
injury.
When leaving th evehicle, always tak ethe
SmartKey wit hyou and loc kthe vehicle. Never
leav echildren unsupervised in th evehicle. G
WARNING
If th esteering whee lisunlocke dwhile the
vehicl eisinm otion,itcould chang eposition
unexpectedly. This could caus eyou to lose
control of th evehicle. There is ariskofan
accident.
Befor estarting off ,makes uret he steering
whee lislocked. Never unloc kthe steering
whee lwhile th evehicl eisinm otion. 88
Steering wheelSeats
,steering wheel and mirrors

should have
agood overview of traffic con-
ditions.
Folding the exterior mirrors in or out
electrically X
Select key position 1or 2with the Start/
Stop button.
X Briefly press button 0085.
Both exterior mirrors fold in or out.
i Make sure that the exterior mirrors are
always folded out fully while the vehicle is in motion, as they may otherwise vibrate.
i If you are driving faster than 30 mph
(47 km/h), you can no longer fold in the
exterior mirrors.
Setting the exterior mirrors If the battery has been disconnected or com-
pletely discharged, the exterior mirrors must
be reset. The exterior mirrors will otherwise
not fold in when you select the "Fold in mir-
rors when locking" function in the on-board
computer (Y page 160).
X Select key position 1using the Start/Stop
button.
X Briefly press button 0085.
Folding the exterior mirrors in or out
automatically If the "Fold in mirrors when locking" function
is activated in the on-board computer
(Y page 160): R
the exterior mirrors fold in automaticallyas
soon as you lock the vehicle from the out-
side.
R the exterior mirrors fold out againa utomat-
ically as soon as you unlock the vehicle and
then open the driver's or front-passenger
door.
i The mirrors do not fold out if they have
been folded in manually.
Exterior mirror pushed out of position If an exterior mirror has been pushed out of
position, proceed as follows:
X Vehicles without electrically folding
exterior mirrors: move the exterior mirror
into the correct position manually.
X Vehicles with electrically folding exte-
rior mirrors: press and hold mirror-folding
button until you hear aclick and then the
mirrors engage in position (Y page 91).
The mirror housing is engaged againa nd
you can adjust the exterior mirrors as usual
(Y page 90). Automatic anti-glare mirrors
The rear-view mirror and the exterior mirror
on the driver's side automaticallygoi nto anti-
glare mode if the following conditions are met simultaneously:
R the ignition is switched on and
R incident light from headlamps strikes the
sensor in the rear-view mirror.
The mirrors do not go into anti-glare mode if
reverse gear is engaged. Parking position for the exterior mir-
ror on the front-passengers
ide
Setting and storing the parking position You can position the front-passenger side
exterior mirror in such away that you can see
the rear wheel on that side as soon as you Mirrors
91Seats, steering wheela nd mirrors Z

causes of poo
rvisibility du etothe weather
conditions such as spray. There is ariskofan
accident.
In such situations, turn the light switch to
0058.
The automatic headlamp feature is only an
aid. The driver is responsibl efor the vehicle's
lighting at al ltimes.
0058 is the favored light switch setting. The
light setting is automaticall yselected accord-
ing to the brightnes softhe ambient light
(exception: poo rvisibility du etoweathe rcon-
ditions such as fog, snow or spray):
R SmartKey in position 1in the ignition lock:
the parking lamps are switched on or off
automaticall ydepending on the brightness
of the ambient light.
R With the engine running: if yo uhavea cti-
vate dthe daytime running lamps function
via the on-board computer, the daytime
running lamps or the low-bea mheadlamps
and parking lamps are switched on or off
automaticall ydepending on the brightness
of the ambient light.
Onl yfor Canada:
The daytime running lamps improve the visi-
bility of your vehicle during the day. The day- time running lamps function is required by law
in Canada. It cannot therefore be deactivated.
Whe nthe engine is running and the vehicle is
stationary: if yo umove the selector lever from
ad rive position to P,the daytime running
lamps/low-bea mheadlamp sgooutafter
three minutes.
Whe nthe engine is running, the vehicle is
stationar yand in bright ambient light: if you
turn the light switch to 0060,the daytime
running lamps and parking lamps switch on.
If the engine is running and yo uturn the light
switch to 0058,the manual settings take
precedence over the daytime running lamps.
USA only:
The daytime running lamps improve the visi-
bility of your vehicle during the day. To do this,
the daytime running lamps function mus tbeswitched on using the on-board computer
(Y
page 158).
If the engine is running and yo uturn the light
switch to 0060or0058,t he manual settings
take precedence over the daytime running
lamps.
i In the USA, the daytime running lamps are
deactivated upon delivery from the factory.
X To switc honautomati cheadlamp
mode: turn the light switch to 0058.
Low-beam headlamps
Even if the light senso rdoesn ot detect that it
is dark, the parking lamps and low-beam
headlamp sswitch on whe nthe ignition is
switched on and the light switch is set to the 0058 position. Thi sisaparticularly useful
function in the event of rai nand fog.
X To switc honthe low-beam headlamps:
turn the SmartKey in the ignition lock to
position 2or star tthe engine.
X Turn the light switch to 0058.
The green 0058indicator lamp in the instru-
ment cluster lights up.
Parking lamps ! If the battery ha
sbeene xcessivel ydis-
charged ,the parking lamps or standing
lamps are automaticall yswitched off to
enabl ethe next engine start. Alway spark
your vehicle safel yand sufficiently lit
according to lega lstandards. Avoi dthe
continuou suseof the 0060parking lamps
for several hours. If possible ,switch on the
0064 right or the 0063left standing lamp.
X To switc hon:turn the light switch to 0060.
Standing lamps
Switching on the standing lamps ensures the corresponding sid eofthe vehicle is illumi-
nated. Exterio
rlighting
97Lights and windshieldw ipers Z

The hazard warning lamps switch off auto-
matically if the vehicle exceeds aspeed of
6m ph(10 km/h) again after afull brake appli-
cation.
i The hazard warning lamps still operate if
the ignition is switched off. Headlam
pcleaning system
The headlamps are cleaned automatically if
the "Wipe with washer fluid" function is oper-
ated five times (Y page 101) while the lights
are on and the engine is running. When you
switch off the ignition ,the automatic head-
lamp cleaning system is reset and counting is
resumed from 0. Headlamps fogged up on the inside
The headlamps may fog up on the inside if
there is high atmospheric humidity.
X Drive with the headlamps switched on.
The level of moisture diminishes, depend-
ing on the length of the journey and the
weather conditions (humidity and temper-
ature).
If the level of moisture does not diminish:
X Have the headlamps checked at aqualified
specialist workshop. Interior lighting
Overview of interior lighting
Overhead control panel
0043
0033 Switches the automatic interior
lighting control on/off
0044 003D Switches the right-hand reading
lamp on/off
0087 004A Switches the interior lighting on/off
0085 003D Switches the left-hand reading lamp
on/off Interior lighting control
General notes In order to prevent the vehicle's battery from
discharging, the interior lighting functions are
automatically deactivated after some time
unless the SmartKey is in position 2in the
ignition lock.
Automatic interior lighting control X
To activate/deactivate: press the0033
button.
When the automatic interior lighting
control is activated, the button is flush with
the overhead control panel.
The interior lighting automatically switches
on if you:
R unlock the vehicle
R open adoor
R remove the SmartKey from the ignition lock Interior lighting
99Lights and windshield wipers Z