2018 MERCEDES-BENZ SL CLASS change key battery

Locking/unlockin gc entrallyYou can start ,l oc koru nlock th ev ehicle using
KEYLESS-GO .Todot hi s, you onl yn ee dc arry the
SmartKey with you. You can combine th ef unc-
tions of KEYLESS-GO with those of ac onven-
tional SmartKey. Unloc kt he vehicle by using
KEYLESS-GO ,f or instance, and loc kitu sin gt he
7 button on th eS ma rtKey.
The driver' sd oor and th ed oor at whic ht he han-
dle is used, must bot hbec losed. The SmartKey
must be outside th ev ehicle .W hen locking or
unlocking with KEYLESS-GO ,t he distance
between th ek ey and th ec orresponding door
handle must not be greater than 3ft(1m ).
Ac heck whic hp eriodicall ye stablishe sar adio
connectio nb etween th ev ehicle and th eS ma rt-
Key determine sw hether av alid SmartKey is in
th ev ehicle .T his occurs, for example:R
when starting th ee ngineR
while driving R
when th ee xternal door handles are touched
X
To unlock th ev ehicle: touch th ei nner sur-
fac eoft he door handle.X
To lock th ev ehicle: touch sensor surface C
or D .
Mak es ure that you do not touch th ei nner
surface of th ed oor handle.X
Convenience closing feature: touch
recesse ds ensor surface D for an extended
period.
Further informatio nont he convenience clos-
ing feature ( Y
page 76).
Deactivating and activating
If you do not intend to use aS ma rtKey for an
extended perio doft ime, you can deactivate the
KEYLESS-GO function of th ek ey. The SmartKey
will then use ver yl ittle power ,t he reb yc onserv- ing battery power .F or th ep urposes of activa-
tion/deactivation, th ev ehicle must not be
nearby. X
To deactivate: pres st he 7 button on the
SmartKey twic einr apid succession.
The battery check lamp ( Y
page 68 )oft he
SmartKey flashes twic eb riefly and light su p
once, then KEYLESS-GO is deactivated. X
To activate: pres sa ny button on th eS ma rt-
Key.
or X
Inser tt he SmartKey int ot he ignitio nl ock.
KEYLESS-GO and all of its associate df eatures
are available again.
Changing th es ettings of th el ocking
system You can change th es ettings of th el ockin gs ys-
tem .T his mean so nl yt he driver' sd oor ,t he lock-
able stowage compartments in th ev ehicle inte-
rior and th ef uel filler flap are unlocked when the
vehicle is unlocked. This is useful if you fre-
quently travel alone. X
To change th es etting: pres sa nd hold down
the 6 and 7 buttons simultaneously
for about six second su ntil th eb attery indica-
to rl amp ( Y
page 68 )f lashes twice.
If th es ettin goft he lockin gs ystem is changed
within th es ignal range of th ev ehicle ,p ressing
the 7 or 6 button: R
locks or R
unlock st he vehicle
The SmartKey now function sasf ollows:X
To unlock: pres st he 6 button once.X
To unlock centrally: pres st he 6 button
twice. X
To lock centrally: pres st he 7 button.
The KEYLESS-GO function is changed as fol-
lows: X
To unlock th ed ri ver's door: touch th ei nner
surface of th ed oor handle on th ed river's
door. X
To unlock centrally: touch th ei nner surface
of th ed river or front-passenger door handle. X
To lock centrally: touch th eo uter sensor
surface on one of th ed oor handles.66
SmartKey
Opening and closing

Checking th eb atteryX
Press the 7 or 6 button.
The battery is working properl yifb attery
check lamp C light supb riefly.
The battery is discharged if battery check
lamp C does no tl ight up briefly.X
Change th eb attery ( Y
page 68).
If th eS ma rtKey battery is checked within the
signal reception range of th ev ehicle ,p ressing
the 7 or 6 button:R
locks or R
unlock st he vehicle
i You can get ab attery at any qualified spe-
cialist workshop.
Replacin gt he batteryYou require aCR2 02 53V cel lb attery.X
Tak et he mechanical ke yo ut of th eS ma rtKey
( Y
page 67). X
Press mechanical key D int ot he SmartKey
opening in th ed irection of th ea rrow until bat-
tery compartmen tc over C opens. Do not
hold battery compartmen tc over C closed
while doin gs o. X
Remove battery compartmen tc over C .
X
Repeatedly tap th eS ma rtKey against your
palm until battery

Problem
Possible causes/consequences and P Solutions
The engine cannot be
started using the Smart-
Key. 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.
If this does not work: X
Check the starter battery and charge it if necessary ( Y
page 253).
or X
Jump-start the vehicle ( Y
page 253).
or X
Consult aq ualified specialist workshop.
The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle. The vehicle is locked. X
Unlock the vehicle and try to start the vehicle again.
The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 68) and replace it if necessary
( Y
page 68).
If this does not work: X
Start your vehicle with the SmartKey in the ignition lock.
There is interference from ap owerful source of radio waves.X
Start your vehicle with the SmartKey in the ignition lock.
You have lost aS mart-
Key. X
Have the SmartKey deactivated at aq ualified specialist workshop.X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
The side windows cannot
be opened or closed
using the convenience
opening/closing fea-
ture. The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 68) and replace it if necessary
( Y
page 68).
Doors
Important safety notes
G WARNING
If children are left unsupervised in the vehicle,
they could: R
operate the vehicle's equipment. Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake R
shift the automatic transmission out of park
position P R
start the engine
There is ar isk of an accident and injury.
Never leave children or animals unattended in
the vehicle.70
Doors
Opening and closing

Problem
Possible causes/consequences and P Solutions
As ide window cannot be
closed because it is
blocked by objects, e.g.
leaves in the window
guide. X
Remove the objects. X
Close the side window.
As ide window cannot be
closed and you cannot
see the cause. If as ide window is obstructed during closing and reopens again
slightly: X
Immediately after the window blocks, pull the correspondin gs witch
again until the side window has closed.
The side window is closed with increased force.
If as ide window is obstructed again during closing and reopens again
slightly: X
Immediately after the window blocks, pull the correspondin gs witch
again until the side window has closed.
The side window is closed without the automatic reversing feature.
The side windows cannot
be opened or closed
using the convenience
opening/closing fea-
ture. The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 68) and replace it if necessary
( Y
page 68).
Roof
Important safety notes
G WARNING
If you do not fully open/close the soft top, the
soft-top hydraulics depressurize after as hort
time. This causes the soft top to lower unex-
pectedly and may cause you or others to be
trapped. There is ar isk of injury.
Always open or close the soft top completely.
G WARNING
Closing the roof manually is ac omplicated
and technically demanding procedure, which
requires al ot of strength. You or others can
become trapped. There is ar isk of injury.
Only have the soft top closed manually at a
qualified specialist workshop.
! Never sit on the rear shelf or store heavy
object st here. You will otherwise damage the
roof and the rear shelf of your vehicle. ! Do not forget that the weather can change
abruptly. Make certain that the roof is closed
when you leave the vehicle. The vehicle elec-
tronics can be damaged if water enters the
vehicle interior.
! When opening and closing the roof, make
sure that: R
there is sufficient clearance, as the roof
swings upwards. R
there is sufficient clearance behind the
vehicle, as the trunk lid swings backwards
beyond the bumper. R
the trunk is only loaded to below the trunk
partition. R
the trunk partition is not pushed up by the
load. R
the trunk partition is closed. R
the trunk lid is closed. R
the outside temperature is above 5‡
(

This could result in burns in the immediate
vicinit yoft he air vents. There is ar isk of injury.
Reduce the heater output before it becomes
too hot.
The AIRSCARF function warms the head and
neck area of vehicle occupant sw ith warm air.
The warm air flows out of the holes in the head
restraints.
The three red indicator lamps in the button indi-
cate the heating level you have selected. X
Ensure that the SmartKey is in position H in
the ignition lock. X
To switch on: press button C .
Three red indicator lamps in the button light
up. The blower start supa fter ap reheating
phase of seven seconds. X
Press button C repeatedly until the desired
heating level is set. X
To switch off: press button C repeatedly
until all the indicator lamps go out.
i The blower continues runnin gf or seven sec-
onds to cool down the heating elements.
i If the battery voltage is too low, AIRSCARF
may switch off.
Problems with AIRSCARF AIRSCARF has switched off prematurely or will
not switch on. The vehicle's electrical system
voltage is too low because too many electrical
consumer sa re switched on.X
Switch off electrical consumer st hat you do
not need, such as the rear window defroster
or interior lighting. X
Switch on AIRSCARF again. Steering wheel
Important safety notes
G WARNING
You could lose control of your vehicle if you do
the following while driving: R
adjust the driver's seat, head restraint,
steerin gw heel or mirrors R
fasten the seat belt
There is ar isk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt
before starting the engine.
G WARNING
Children could injure themselves if they
adjust the steerin gw heel. There is ar isk of
injury.
When leaving the vehicle, alway st ake the
SmartKey with you and lock the vehicle. This
also applies to mobile phones if the "Digital
Car Key in smartphone" function is activated
via the Mercedes me connect web app. Never
leave children unsupervised in the vehicle.
The electrically adjustable steerin gw heel can
still be adjusted when there is no SmartKey in
the ignition lock.
Adjusting the steering wheel man-
ually
G WARNING
If the steerin gw heel is unlocked while the
vehicle is in motion ,itc ould change position
unexpectedly. This could cause you to lose
control of the vehicle. There is ar isk of an
accident.
Before starting off, make sure the steering
wheel is locked. Never unlock the steering
wheel while the vehicle is in motion.88
Steering wheel
Seats, steering wheel and mirrors