2016 MERCEDES-BENZ SL-CLASS ROADSTER key battery

Problems with the SmartKey
ProblemPossible causes/consequences andMSolutions
You can no longer lock
or unlock the vehicle
using the SmartKey.The SmartKey battery is discharged or nearly discharged.
XCheck the SmartKey battery (Ypage 85) and replace it if nec-
essary (
Ypage 86).
If this does not work:
XUnlock (Ypage 90) or lock (Ypage 90) the vehicle using the
mechanical key.
The SmartKey is faulty.
XUnlock (Ypage 90) or lock (Ypage 90) the vehicle using the
mechanical key.
XHave the SmartKey checked at a qualified specialist workshop.
You can no longer lock
or unlock the vehicle
using KEYLESS-GO.There is interference from a powerful source of radio waves.
XLock/unlock the vehicle using the remote control function of
the SmartKey. To do this, hold the key as close as possible to the
vehicle and press the %or& button.
If the vehicle can also not be locked/unlocked using the remote
control function:
XUnlock (Ypage 90) or lock (Ypage 90) the vehicle using the
mechanical key.
KEYLESS-GO is malfunctioning.
XLock/unlock the vehicle using the remote control function of
the SmartKey.
XHave KEYLESS-GO checked at a qualified specialist workshop.
If the vehicle can also not be locked/unlocked using the remote
control function:
XUnlock (Ypage 90) or lock (Ypage 90) the vehicle using the
mechanical key.
XHave KEYLESS-GO checked at a qualified specialist workshop.
You have lost a Smart-
Key.XHave the SmartKey deactivated at a qualified specialist work-
shop.
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.
SmartKey87
Opening and closing
Z

ProblemPossible causes/consequences andMSolutions
The engine cannot be
started using the
SmartKey.the on-board voltage is too low.
XSwitch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
XCheck the starter battery and charge it if necessary
(
Ypage 557).
or
XJump-start the vehicle (Ypage 559).
or
XConsult a qualified specialist workshop.
The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle.The vehicle is locked.
XUnlock the vehicle 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.
Doors
Important safety notes
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangering other
people or road users.
Rget out and disrupt traffic.
Roperate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake.
Rshifting the automatic transmission out of
park position P
RStart the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
Unlocking and opening doors from
the inside
!
The side windows will not open/close if
the battery is discharged or if the side win-
dows have iced up. It will then not be pos-
sible to close the door. Do not attempt to
force the door closed. You could otherwise
damage the door or the side window.
You can open a door from inside the vehicle
even if it has been locked.
If the vehicle was previously locked with the
SmartKey or with KEYLESS-GO, opening the
vehicle from the inside will activate the anti-
theft alarm system. Switch off the alarm
(
Ypage 80).
88Doors
Opening and closing

XInsert the mechanical key into the trunk lid
lock as far as it will go.
XTurn the mechanical key clockwise from
position1to position 2.
XRemove the mechanical key.
XInsert mechanical key into the SmartKey
(
Ypage 84).
Unlocking the trunk (mechanical key)
!
The trunk lid swings upwards when
opened. Therefore, make sure that there is
sufficient clearance above the trunk lid.
If the trunk cannot be unlocked with the
SmartKey or KEYLESS-GO, use the mechani-
cal key.
If you use the mechanical key to unlock and
open the trunk lid, the anti-theft alarm system will be triggered (
Ypage 80).
XTake the mechanical key out of the Smart-
Key (
Ypage 84).
XInsert the mechanical key into the trunk lid
lock as far as it will go.
1Basic position
2To unlock
XTurn the mechanical key from position 1
counter-clockwise as far as it will go to
position 2.
XPull the trunk lid handle.
The trunk is unlocked.
XTurn the mechanical key back to position
1and remove it.
XInsert mechanical key into the SmartKey
(
Ypage 84).
Trunk emergency release
You can unlock the trunk lid from the inside
with the emergency release button.
XPress emergency release button :briefly.
The trunk lid unlocks and opens slightly.
XPush the trunk lid upwards to open it com-
pletely.
The trunk lid can be unlocked with the trunk
lid emergency release when the vehicle is
stationary or while driving.
The trunk lid emergency release does not
unlock the trunk lid if the battery is discon-
nected or discharged.
Trunk lid emergency release light:
Remergency release button :flashes for
30 minutes after the trunk lid is opened
Remergency release button :flashes for
60 minutes after the trunk lid is closed
Side windows
Important safety notes
GWARNING
While opening the side windows, body parts
could become trapped between the side win-
96Side windows
Opening and closing

The system automatically switches down
from level3to level 2after approximately
eight 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.
You can set the distribution of the heated
sections of the seat cushion and backrest
using COMAND (
Ypage 318).
XMake sure that the SmartKey is in position 1 or 2in the ignition lock.
XTo switch on: press button:repeatedly
until the desired heating level is set.
XTo switch off: press button:repeatedly
until all the indicator lamps go out.
iIf the battery voltage is too low, the seat
heating may switch off.
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.
XSwitch off electrical consumers that you do
not need, such as the rear window
defroster or interior lighting.
XOnce the battery is sufficiently charged,
switch on the seat heating again.
Switching the seat ventilation on/off
Activating/deactivating
The three blue indicator lamps in the buttons
indicate the ventilation level you have selec-
ted.
XMake sure that the SmartKey is in position
2 in the ignition lock.
XTo switch on: press button:repeatedly
until the desired ventilation level is set.
XTo switch off: press button:repeatedly
until all the indicator lamps go out.
iIf the battery voltage is too low, the seat
ventilation may switch off.
iIf you open the roof with the SmartKey
(
Ypage 102), the seat ventilation of the
driver's seat switches on automatically and
the side windows open.
Problems with the seat ventilation
The seat ventilation 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.
XSwitch off electrical consumers which you
do not need, such as the rear window
defroster or interior lighting.
Seats113
Seats, steering wheel and mirrors
Z

AIRSCARF
Switching on/off
GWARNIN G
When AIRSCARF is switched on ,ver yhot air
can flo wfrom th events in th ehead restraints .
This could result in burn sin th eimmediat e
vicinity of th eair vents .There is aris kof injury.
Reduc eth eheater output before it become s
to ohot .
The AIRSCARF function warm sth ehead and
neck area of vehicl eoccupant swit hwarm air.
The warm air flows out of th ehole sin th ehead
restraints .
The three red indicator lamp sin th ebutto n
indicat eth eheating level you hav eselected.
XMak esur ethat th eSmartKey is in position
2 in th eignition lock.
XTo switch on: press button:.
Three red indicator lamp sin th ebutto nligh t
up. The blowe rstart sup after apreheating
phas eof seven seconds.
XPress butto n: repeatedly until th e
desired heating level is set .
XTo switchoff:press butto n: repeatedly
until all th eindicator lamp sgo out .
iThe blowe rcontinues runnin gfor seven
seconds to cool down th eheating ele-
ments .
iIf thebattery voltag eis to olow, AIRSCARF
may switch off .
Steering wheel
Important safety notes
GWARNIN G
You could lose control of your vehicl eif you do
th efollowin gwhile driving:
Radjust th edriver's seat ,head restraint,
steering whee lor mirror s
Rfastenth eseat belt
There is aris kof an accident.
Adjus tth edriver's seat ,head restraint, steer -
ing whee land mirror and faste nyour seat belt
before starting th eengine.
GWARNIN G
Children could injure themselves if they
adjust th esteering wheel. There is aris kof
injury.
When leaving th evehicle, always tak eth e
SmartKey wit hyou and loc kth evehicle. Never
leav echildren unsupervised in th evehicle.
The electrically adj ustablesteering whee lcan
still be adj usted when there is no SmartKey in
th eignition lock.
Adjusting the steering wheel electri -
cally
:To adjust th e steering whee lheight
;To adj ustthesteering whee lposition
(fore-and-af tadjustment)
114Steering wheel
Seats, steering wheel and mirrors

4ÃAutomatic headlamp mode, control-
led by the light sensor
5 LLow-beam/high-beam headlamps
Even if the light sensor does not detect that it
is dark, the parking lamps and low-beam
headlamps switch on when the ignition is
switched on and the light switch is set to the
L position. This is a particularly useful
function in the event of rain and fog.
XTo switch on the low-beam headlamps:
turn the SmartKey in the ignition lock to
position 2or start the engine.
XTurn the light switch to L.
The green Lindicator lamp in the instru-
ment cluster lights up.
Parking lamps
!If the battery has been excessively dis-
charged, the parking lamps or standing
lamps are automatically switched off to
enable the next engine start. Always park
your vehicle safely and sufficiently lit
according to legal standards. Avoid the
continuous use of the Tparking lamps
for several hours. If possible, switch on the
X right or the Wleft standing lamp.
1WLeft-hand standing lamps
2XRight-hand standing lamps
3TParking lamps, license plate and
instrument cluster lighting
4ÃAutomatic headlamp mode, control-
led by the light sensor
5LLow-beam/high-beam headlamps
XTo switch on: turn the light switch to T.
The green Tindicator lamp in the instru-
ment cluster lights up.
Standing lamps
1 WLeft-hand standing lamps
2XRight-hand standing lamps
3TParking lamps, license plate and
instrument cluster lighting
4ÃAutomatic headlamp mode, control-
led by the light sensor
5LLow-beam/high-beam headlamps
Switching on the standing lamps ensures the
corresponding side of the vehicle is illumina-
ted.
XTo switch on the standing lamps: the
SmartKey is not in the ignition lock or it is in
position 0.
XTurn the light switch to W(left-hand side
of the vehicle) or X(right-hand side of
the vehicle).
124Exterior lighting
Lights and windshield wiper s

Interior lighting control
General notes
In order to prevent the vehicle's battery from
disc harging, the interior lighting functions are
automatical lydeactivated after some time
unless the SmartKey is inposition 2in the
ignit ion lock.
Automatic interior lighting control
Overhead control panel
:
p Toswit ch the left-hand reading lamp
on/o ff
;c Toswit ch the interior lighting on
=| Toswit ch the interior lighting/auto-
mat icinterior lighting control off
?p To switch the right-hand reading
lamp on/o ff
AToswit ch the automat icinterior lighting
control on
XTo switch on: set the switch to center
position A.
XTo switch off: set the switch to the |
position.
The interior lighting automatically switches
on ifyou:
Runlock the vehicle
Ropen a door
Rremove the SmartKey from the ignit ion lock
The interior lightis activated for a short while
when the SmartKey is removed from the igni-
tion lock. You can activate th isdelayed switch-off using the on-board computer
(
Ypage 234).
Manual interior lighting control
XTo switch
the interi orlighti ng on: set the
switch to the cposition.
XTo switch the interi orlighti ng off: set the
switch to the |or (if the door isclosed)
to the center posit ion.
XTo switchthe reading lamps on/off:
press the pbutton.
Crash-responsive emergency lighting
The interior lighting isactivated automatical ly
if the vehicle isinvolved inan acc ident.
XTo switch off the crash-responsive
eme rgency lighti ng:press the hazard
warning lamp button.
or
XLock and then unlock the vehicle using the Sm artKey.
Replacing bulbs
GDANGER
Xenon bulbs carry ahigh voltage. You can get
an electric shock if you remove th ecover of
th eXenon bulb and touch th eelectrical con-
tacts .Ther eis aris kof fatal injury.
Never touch th epart sor th eelectrical con-
tacts of th eXenon bulb. Always hav ewor kon
th eXenon bulbs carrie dout at aqualified spe-
cialist workshop.
The front and rear lamps of your vehicle are
equipp edwith either Xenon or LED bulbs. Do
not replace the bulbs yourself. Contact a
qualif ied specialist workshop which has the
necessary specialist knowledge and tools to
carry out the work required.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
Replacing bulbs129
Lights and windshield wipers
Z

Problems with the rear window defroster
ProblemPossible causes/consequences andMSolutions
The rear window
defroster has deactiva-
ted prematurely or can-
not be activated.The on-board voltage is too low because too many electrical con-
sumers are switched on.
XSwitch off any consumers that are not required, e.g. reading
lamps, interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window
defroster can be activated again.
Switching air-recirculation mode
on/off
General notes
If you switch on air-recirculation mode, the
windows can fog up more quickly, in particu-
lar at low temperatures. Only use air-recircu-
lation mode briefly to prevent the windows
from fogging up.
Activating or deactivating
XTurn the SmartKey to position 2in the igni-
tion lock (
Ypage 151).
XTo activate: press thegbutton.
The indicator lamp in the gbutton lights
up.
iAir-recirculation mode is automatically
activated at high levels of pollution or at
high outside temperatures. When air-recir-
culation mode is activated automatically,
the indicator lamp in the gbutton is not lit. Outside air is added after about
30 minutes.
XTo deactivate:
press thegbutton.
The indicator lamp in the gbutton goes
out.
iAir-recirculation mode deactivates auto-
matically:
Rafter approximately five minutes at out-
side temperatures below approximately
41 ‡ (5 †)
Rafter approximately five minutes if cool-
ing with air dehumidification is deactiva-
ted
Rafter approximately 30 minutes at out-
side temperatures above approximately
41 ‡ (5 †) if the "Cooling with air dehu-
midification" function is activated
Switching the residual heat on or off
General notes
146Operating the climate control systems
Climate control