change key battery MERCEDES-BENZ SLK-CLASS ROADSTER 2016 Owners Manual

Changing the settings of the locking
system
You can change the settings of the locking
system. This means only the driver's door, the
lockable stowage compartments in the vehi-
cle interior and the fuel filler flap are unlocked
when the vehicle is unlocked. This is useful if
you frequently travel on your own.
XTo change the setting: press and hold
down the %and& buttons simulta-
neously for about six seconds until the bat- tery indicator lamp flashes twice
(
Ypage 75).
iIf the setting of the locking system is
changed within the signal range of the vehi-
cle, pressing the &or% button:
Rlocks or
Runlocks the vehicle
The SmartKey now functions as follows:
XTo unlock: press the%button once.
XTo unlock centrally: press the%but-
ton twice.
XTo lock centrally: press the&button.
The KEYLESS-GO function is changed as fol-
lows:
XTo unlock the driver's door: touch the
inner surface of the door handle on the
driver's door.
XTo unlock centrally: touch the inner sur-
face of the front-passenger door handle.
XTo lock centrally: touch the outer sensor
surface on one of the door handles.
XTo restore the factory settings: press
and hold down the %and& buttons
simultaneously for appro ximat
ely six sec-
onds until the battery check lamp flashes
twice (
Ypage 75).
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 or the trunk lid, the
anti-theft alarm system will be triggered
(
Ypage 69).
There are several ways to turn off the alarm:
XTo deactivate the alarm with the key:
press the %or& button on the key.
or
XInsert the SmartKey into the ignition lock.
or
XTo deactivate the alarm with KEYLESS-
GO: press the Start/Stop button in the igni-
tion lock. The SmartKey must be in the
vehicle.
or
XLock or unlock the vehicle using KEYLESS-
GO. The SmartKey must be outside the
vehicle.
If you unlock the vehicle using the mechanical
key, the fuel filler flap will not be unlocked
automatically.
XTo unlock the fuel filler flap: insert the
SmartKey into the ignition lock.
Removing the mechanical key
74SmartKey
Opening and closing

XPush release catch:in the direction of
the arrow and at the same time remove
mechanical key ;from the SmartKey.
For further information about:
Runlocking the driver's door (Ypage 80)
Runlocking the trunk (Ypage 82)
Rlocking the vehicle (Ypage 80)
Inserting the mechanical key
XPush mechanical key ;completely into
the SmartKey until it engages and release
catch :is back in its basic position.
Push mechanical key ;completely into
the SmartKey until it engages and the
release catch is back in its basic position.
SmartKey battery
Important safety notes
GWARNING
Batteries contain toxic and corrosive substan- ces. If batteries are swallowed, it can result in
severe health problems. There is a risk of fatalinjury.
Keep batteries out of the reach of children. If
a battery is swallowed, seek medical attention immediately.
Mercedes-Benz recommends that you have
the batteries replaced at a qualified specialist
workshop.
The SmartKey batteries contain perchlorate
material, which may require special handling and regard for the environment. National
guidelines must be observed during disposal.
In California, see www.dtsc.ca.gov/Hazard-
ousWaste/Perchlorate/index.cfm.
Checking the battery
XPress the
&or% button.
The battery is working properly if battery
check lamp :lights up briefly.
The battery is discharged if battery check
lamp :does not light up briefly.
XChange the battery (Ypage 75).
If the SmartKey battery is checked within the
signal reception range of the vehicle, pressing
the & or% button:
Rlocks or
Runlocks the vehicle
iYou can get a battery at any qualified spe-
cialist workshop.
Replacing the battery
You require a CR 2025 3 V cell battery.
XTake the mechanical key out of the Smart-
Key (
Ypage 74).
SmartKey75
Opening and closing
Z

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 75) and replace it if nec-
essary (
Ypage 75).
If this does not work:
XUnlock (Ypage 80) or lock (Ypage 80) the vehicle using the
mechanical key.
The SmartKey is faulty.
XUnlock (Ypage 80) or lock (Ypage 80) 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 80) or lock (Ypage 80) 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 80) or lock (Ypage 80) 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.
SmartKey77
Opening and closing
Z

Display messagesPossible causes/consequences andMSolutions
Wiper Malfunction‐
ing
The windshield wipersare malfunctioning.
XVisit aqualified specialist workshop .
Hazard Warning
Flashers Malfunc‐
tioning
The hazard warnin glamp sare faulty.
XVisit aqualified specialist workshop .
SmartKey
Display messagesPossible causes/consequences and MSolutions
Â
Key DoesNot
Belong to Vehicl e
You haveput th ewrong SmartKey in th eignition lock.
XUse th ecorrec tSmartKey.
Â
Tak eYourKeyfrom
Ignition
The SmartKey is in th eignition lock.
XRemove th eSmartKey.
Â
Obtain aNew Key
The SmartKey needs to be replaced.
XVisit aqualified specialist workshop .
Â
ReplaceKeyBattery
The SmartKey battery is discharged.
XChange th ebattery (Ypage 75) .
Â
Don't Forget You r
Key
The SmartKey is notin th eignition lock. You hav eopened th e
driver's doo rwit hth eengin eswitched off.
The multifunction display shows th edisplay message amaximum
of 60 seconds and is simply areminder .
XTaketh eSmartKey wit hyou when you leav eth evehicle.
Â
Key Not Detected
(re ddisplay message )
The SmartKey is no tin th evehicle.
A warnin gtone also sounds.
If th eengin eis switched off, you can no longer loc kth evehicl e
centrall yor start th eengine.
XPull ove rand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 160).
XLocate th eSmartKey.
XPress aon thesteerin gwhee lto confirm th edisplay mes -
sage .
240Display messages
On-board computer and displays

Always switch off the ignition when towing thevehicle with a tow cable or a tow bar.
Vehicles with 9G-TRONIC: the automatic
transmission automatically shifts to position
P when you open the driver's or front-
passenger door or when you remove the key
from the ignition lock.
Vehicles with automatic transmission: in
order to ensure that the automatic transmis-
sion stays in position Nwhen towing away the
vehicle, you must observe the following
points:
XSwitch on the hazard warning lamps
(
Ypage 111).
XTurn the SmartKey to position 2in the igni-
tion lock.
On vehicles with KEYLESS-GO, use the
SmartKey instead of the Start/Stop button
(
Ypage 140).
XDepress and hold the brake pedal.
XShift the transmission to position N.
XRelease the brake pedal.
XRelease the electric parking brake.
XLeave the SmartKey in position2in the
ignition lock.
In order to signal a change of direction when
towing the vehicle with the hazard warning
lamps switched on, use the combination
switch as usual. In this case, only the indica-
tor lamps for the direction of travel flash.
When you reset the combination switch, the
hazard warning flashers start flashing again.
It is important that y
ou observe the safety
instructions when towing away your vehicle
(
Ypage 301).
Towing the vehicle with the rear axle
raised
!
The ignition must be switched off if you
are towing the vehicle with the rear axle
raised. Intervention by ESP
®could other-
wise damage the brake system.
!Vehicles with automatic transmission
must not be towed with the rear axle raised.
The vehicle/trailer combination may oth-
erwise swerve or even roll over.
Transporting the vehicle
!
You may only secure the vehicle by the
wheels, not by parts of the vehicle such as
axle or steering components. Otherwise,
the vehicle could be damaged.
The towing eye can be used to pull the vehicle
onto a trailer or transporter for transporting
purposes.
XTurn the SmartKey to position 2in the igni-
tion lock.
XShift the transmission to position N.
As soon as the vehicle has been loaded:
XPrevent the vehicle from rolling away by
applying the electric parking brake.
XShift the transmission to position P.
XTurn the SmartKey in the ignition lock to
position0and remove the SmartKey from
the ignition lock.
XSecure the vehicle.
Tow-starting (emergency engine
starting)
!
Vehicles with automatic transmission
must not be tow-started. You could other-
wise damage the automatic transmission.
You can find information on "Jump-starting" at
(
Ypage 299).
Before tow-starting:
Rthe battery must be connected
Rthe engine must be cold
Rthe exhaust system must have cooled down
When tow-starting, it is important that you
observe the safety instructions (
Ypage 301).
Towing and tow-starting303
Breakdo wn assis tance
Z