2018 MERCEDES-BENZ SL CLASS key

ECO start/stop function During automatic engine switch-off ,t he climate
control system only operate satar educed capa-
city. If you require full climate control capacity,
th eE CO start/sto pf unction can be deactivated
by pressin gt he ECO button ( Y
page 120).
Operating th ec limat ec ontrol sys-
tems
Activating/deactivatin gc limat ec on-
trol
General notes When th ec limate control is switched off ,t he air
supply and air circulation are also switched off.
The windows coul df og up. Therefore, switch off
climate control only briefly
i Activate climate control primarily usin gt he
X butto n( Y
page 109).
Air-conditioning system X
Turn th eS ma rtKey to position H in th ei gni-
tio nl oc k( Y
page 116).X
To switch on: tur na irflow control k clock-
wise to th ed esired position (excep tp osition
0 )( Y
page 104).X
To switch off: tur na irflow control k coun-
ter-clockwise to position 0 ( Y
page 104).
3-zone automatic climat ec ontrolX
Turn th eS ma rtKey to position H in th ei gni-
tio nl oc k( Y
page 116).X
To switch on: pres st he X button.
The indicator lamp in the X button lights
up. Airflow and air distribution are set to auto-
matic mode.
or X
Press the x button.
The indicator lamp in the x button goes
out .T he previously selecte ds ettings are
restored. X
To switch off: pres st he x button.
The indicator lamp in the x button lights
up. Switching cooling with air dehumidi-
fication on/off
General notes If you deactivate th e" Coolin gw ith air-dehumid-
ification" function ,t he air inside th ev ehicle will
no tbec ooled. The air inside th ev ehicle will also
no tbed ehumidified. The windows can fog up
mor eq uickly. Therefore, deactivate th ec ooling
with air-dehumidification function only briefly.
The "Coolin gw ith air dehumidification "f unction
is only availabl ew hen th ee ngine is running. The
air inside th ev ehicle is cooled and dehumidified
according to th et em peratur es elected.
Condensation may drip from th eu ndersid eo f
th ev ehicle when it is in cooling mode. This is
normal and no tas ign that there is am alfunc-
tion.
Activating/deactivating X
To activate: pres st he Z or V button.
The indicator lamp in the Z or V button
light su p. X
To deactivate: pres st he Z or V but-
ton.
The indicator lamp in the Z or V button
goes out .T he "Coolin gw ith air dehumidifica-
tion" function has ad elayed switch-off fea-
ture.108
Operating th ec limate control systems
Climate control

Problems with the "Cooling with air dehumidification" function Problem
Possible causes/consequences and P Solutions
The indicator lamp in the
Z or V button
flashes three times or
remains off. The "Cool-
ing with air dehumidifi-
cation" function cannot
be switched on. Cooling with air dehumidification has been deactivated due to am al-
function. X
Visit aq ualified specialist workshop.
Setting climate control to automatic
General notes Automatic mode is only available with 3-zone
automatic climate control.
In automatic mode, the set temperature is main-
tained automatically at ac onstant level. The
system automatically regulates the temperature
of the dispensed air, the airflow and the air dis-
tribution.
The automatic mode functions optimally when
the "Cooling with air dehumidification" function
is activated. If necessary, cooling with air dehu-
midification can be deactivated.
If you deactivate the "Cooling with air-dehumid-
ification" function, the air inside the vehicle will
not be cooled. The air inside the vehicle will also
not be dehumidified .T he windows can fog up
more quickly. Therefore, deactivate the cooling
with air-dehumidification function only briefly.
Automatic control X
Turn the SmartKey to position H in the igni-
tion lock ( Y
page 116).X
Set the desired temperature. X
To activate: press the X button.
The indicator lamp in the X button lights
up. Automatic air distribution and airflow are
activated. X
To switch to manua lm ode: press the

Setting the air distribution
Air-conditioning system X
Turn the SmartKey to position H in the igni-
tion lock ( Y
page 116).X
Press one or more of the

Problems with the rear window defroster Problem
Possible causes/consequences and P Solutions
The indicator lamp on
the l button flashes.
The rear window
defroster has deactiva-
ted prematurely or can-
not be activated. The on-board voltage is too low because too many electrical consum-
ers are switched on. X
Switch 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.
The roof is open. X
Close the roof.
When the roof is closed, the rear window defroster can be activated
again.
Switching air-recirculation mode
on/off
General notes If you switch on air-recirculation mode, the win-
dows can fog up more quickly, in particular at
low temperatures. Only use air-recirculation
mode briefly to prevent the windows from fog-
ging up.
Activating/deactivating X
Turn the SmartKey to position H in the igni-
tion lock ( Y
page 116).X
To activate: press the r button.
The indicator lamp in the r button lights
up.
i Air-recirculation mode is automatically acti-
vated at high levels of pollution (dual-zone
automatic climate control only) or at high out-
side temperatures. When air-recirculation
mode is activated automatically, the indicator
lamp in the r button is not lit. Outside air
is added after about 30 minutes. X
To deactivate: press the r button.
The indicator lamp in the r button goes
out. i Air-recirculation mode deactivates auto-
matically: R
after approximately five minutes at outside
temperatures below approximately 41 ‡
(5 †) R
after approximately five minutes if cooling
with air dehumidification is deactivated R
after approximately 30 minutes at outside
temperatures above approximately 41 ‡
(5 †) if the "Cooling with air dehumidifica-
tion" function is activated
Switching the residual heat on or off
General notes The residual heat function is only available on
vehicles for Canada.
It is possible to make use of the residual heat of
the engine to continue heating the stationary
vehicle for up to 30 minutes after the engine has
been switched off. The heating time depends on
the set interior temperature.
Activating/deactivating X
Turn the SmartKey to position

Where possible, avoid spinnin gt he drive
wheels when pulling away on slippery roads.
You could otherwise damage the drive train.
Key positions
SmartKey
Z
To remove the SmartKeyG
Power supply for some consumers, such as
the windshield wipersH
Ignition (power supply for all consumers)
and drive positionI
To start the engine
i The SmartKey can be turned in the ignition
lock even if it is not the correct SmartKey for
the vehicle. The ignition is not switched on.
The engine cannot be started.
KEYLESS-GO
General notes Vehicles with KEYLESS-GO are equipped with a
SmartKey featuring an integrated KEYLESS-GO
start function and ad etachable Start/Stop but-
ton.
The Start/Stop button must be inserted in the
ignition lock and the SmartKey must be in the
vehicle.
When you insert the Start/Stop button into the
ignition lock, the system needs approximately
two seconds recognition time. You can then use
the Start/Stop button.
Pressing the Start/Stop button several times in
succession corresponds to the differen tk ey
positions in the ignition lock. This is only the
case if you are not depressing the brake pedal. If you depress the brake pedal and press the
Start/Stop button ,t he engine start si mmedi-
ately.
Ac heck which periodically establishes ar adio
connection between the vehicle and the Smart-
Key determines whether av alid SmartKey is in
the vehicle. This occurs ,f or example, when
starting the engine.
To start the vehicle without actively using the
SmartKey: R
the Start/Stop button must be inserted in the
ignition lock. R
the SmartKey must be in the vehicle. R
the vehicle must not be locked with the
SmartKey or KEYLESS-GO ( Y
page 65).
Do not keep the SmartKey: R
with electronic devices, e.g. am obile phone
or another SmartKey. R
with metallic objects, e.g. coins or metal foil. R
inside metallic objects, e.g. am etal case.
This can impair the functionality of the KEY-
LESS-GO key.
If you lock the vehicle with the SmartKey's
remot ec ontrol or with KEYLESS-GO, after a
short time: R
you will not be able to switch on the ignition
with the Start/Stop button. R
you will not be able to start the engine with the
Start/Stop button until the vehicle is
unlocked again.
The engine can be switched off while the vehicle
is in motion by pressing and holding the Start/
Stop button for three seconds. This function
operates independently of the ECO start/stop
automatic engine switch-off function.
Key positions with KEYLESS-GO
C
Start/Stop button
D
Ignition lock116
Driving
Driving and parking

As soo na st he ignition is switched on, al lt he
indicator lamps in the instrument cluster light
up .F urther informatio nons it uations where an
indicator lamp either fails to go ou ta fte rs tarting
the engine or lights up whil ed riving
( Y
page 204).
If Start/Stop button C ha sn ot ye tb ee n
pressed, thi sc orrespond stot he key being
remove df rom the ignition.X
To switc hont he power supply: press
Start/Stop button C once.
The powe rs uppl yiss wi tched on. Yo uc an now
activate the windshield wipers, for example.
The powe rs uppl yiss wi tched off agai ni f:R
the driver's door is opene da ndR
yo up ress Start/Stop button C twice when
in thi sp ositionX
To switc hont he ignition: press Start/Stop
button C twice.
The ignition is switched on.
If yo up ress Start/Stop button C once when
in thi sp osit ion, the ignition is switched off
again.
Removing the Start/Sto pb uttonYo uc an remove the Start/Stop button from the
ignition lock and start the vehicl easn ormal
using the SmartKey. X
Remove Start/Stop button C from ignition
lock D .
Yo udon ot have to remove the Start/Stop but-
ton from the ignition lock when yo ul eave the
vehicle. Yo us hould, however, always take the
SmartKe yw it hy ou when leaving the vehicle. As
long as the Sma rtKe y isint h
e vehicle:R
the vehicl ec an be started using the Start/
Stop button R
the electrically powered equipment can be
operated
Starting the engine
Important safety notes
G WARNING
If children ar el ef tu nsupervised in the vehicle,
they could: R
operate the vehicle's equipment. Additionally, children could set the vehicl ei n
motion if, for example, they: R
release the parking brake R
shift the automatic transmission ou tofp ar k
position P R
start the engine
There is ar is kofana ccident and injury.
Never leav ec hildren or animals unattended in
the vehicle.
Whe nl eavi ng the vehicle, always take the
SmartKe yw it hy ou and lock the vehicle. This
also applie stom obil ep hones if the "Digital
Ca rK ey in smartphone "f un ctio ni sa ctivated
via the Mercedes me connect we ba pp .
G WARNING
Combustion engine se mi tp oiso nou se xhaust
gases such as carbo nm onoxide. Inhaling
thes ee xhaus tg as es lead stop oiso ning. There
is ar is koff ata li njury .T herefore neve rl eave
the engine running in enclose ds paces with-
ou ts uf ficient ventilation.
G WARNING
Flammabl em at erial si ntroduced through
environmenta li nfluence or by animals can
ignite if in contact with the exhaus ts ys tem or
parts of the engine tha th ea tu p. There is ar isk
of fire.
Carry ou tr egular checks to make sure that
ther ea re no flammabl ef oreig nm at erial si n
the engine compartment or in the exhaust
system.
During ac ol ds tart, the engine runs at higher
speed stoe nabl et he catalytic converter to
reach its operating temperature .T he sound of
the engine ma yc hange during thi st ime.
Automati ct ransmission X
Depres st he brake peda la nd kee pi t
depressed. X
Shift the transmission to position ] .
Transmission positio nd is play ] is shown in
the multifunctio nd is play.Driving 117
Driving an dp arking Z

i You can star tt he engin eint ra nsmission
position ] and \\ .
Starting procedur ew ith th eS martKeyTo star tt he engin eu sing the SmartKey instead
of KEYLESS-GO, pull the Start/Stop button out
of the ignition lock. X
Turn the SmartKey to position I in the igni-
tion lock ( Y
page 116 )a nd release it as soon
as the engin eisr unning.
Using KEYLESS-GO to start th ee ngineThe Start/Stop button can be used to star tt he
vehicle manually without insertin gt he SmartKey
int ot he ignition lock .T he Start/Stop button
must be inserted in the ignition lock and the
SmartKey must be in the vehicle. This mode for
startin gt he engin eo perates independently of
the ECO start/sto pa utomatic engin es tar tf unc-
tion. X
Depress the brak ep edal and keep it
depressed. X
Press the Start/Stop button once
( Y
page 116).
The engin es tarts.
Pulling away
Genera ln otes
G WARNING
If the engin es peed is above the idling speed
and you engage transmission position D or R ,
the vehicle could pull away suddenly. There is
ar isk of an accident.
When engagin gt ra nsmission position D or R ,
always firmly depres st he brak ep edal and do
not simultaneously accelerate.
! Change gear in good tim ea nd avoid spin-
nin gt he wheels. You could otherwise damage
the vehicle.
Depress the accelerator carefully when pulling
away.
The vehicle lock sc entrally onc ey ou have pulled
away. The locking knobs in the doors drop down.
You can open the doors from the inside at any
time. You can also deactivate the automatic locking
feature ( Y
page 173).
It is only possible to shift the transmission from
position ] to the desired position if you
depres st he brak ep edal. Only the nist he shift
lock released.
i Upshifts tak ep lace at higher engin es peeds
afte rac old start. This helps the catalytic con-
verter to reach its operating temperature
more quickly.
Information on the automatic release of the
electric parking brak e( Y
page 133).
Hill start assist Hill star ta ssist helps you when pulling away
forwar dorinr everse on an uphill gradient. It
holds the vehicle for as hor tt im ea fte ry ou have
removed your foot from the brak ep edal. This
gives you enough tim etom ove your foot from
the brak ep edal to the accelerator pedal and to
depres sitb efor et he vehicle begins to roll.
G WARNING
After as hor tt ime, hill star ta ssist will no lon-
ger brak ey our vehicle and it could roll away.
There is ar isk of an accident and injury.
Therefore, quickly move your foot from the
brak ep edal to the accelerator pedal. Never
leave the vehicle when it is held by hill start
assist.
Hill star ta ssist is not active if: R
you are pulling away on al evel road or on a
downhill gradient R
the transmission is in position \\R
the electric parking brak eisa ppliedR
ESP ®
is malfunctioning
ECO start/stop function
Introduction
The ECO start/sto pf unction switches the
engin eo ff automatically if the vehicle is stopped
under certain conditions.
The engin es tarts automatically when the driver
want stop ull away again. The ECO start/stop
function thereby helps you to reduce the fuel
consumption and emissions of your vehicle.118
Driving
Driving and parking

Important safety notes
G WARNIN G
If th ee ng in eiss witched off automatically and
you exit th ev ehicle, th ee ng in eisr estarte d
automatically. The vehicl em ay begi nm oving .
Ther eisar is kofa cciden ta nd injury.
If you wish to exit th ev ehicle, always tur no ff
th ei gnition and secure th ev ehicl ea gainst
rollin ga way.
General notes
C
ECO start/sto pd isplay
The ECO start/sto pf unction is activated when -
eve ry ou switch on th ee ng in eu sin gt he Smart -
Key or th eS ta rt/Sto pb utton.
If th ee ng in eh as been switched off automati-
call ybyt he ECO start/sto pf unction ,t he