change key battery MERCEDES-BENZ SLK-CLASS ROADSTER 2015 Owners Manual

The SmartKey centrally locks/unlocks:R the doors
R the trunk lid
R the stowage compartment in the center
console
R the fuel filler flap
The turn signals flash once when unlocking
and three times when locking.
You can also set an audible signal to confirm that the vehicle has been locked. The audible
signal can be activated and deactivated using the on-board computer ( Ypage 207).
When it is dark, the surround lighting also
comes on if it is activated in the on-board
computer ( Ypage 206).
KEYLESS-GO
General notes
Bear in mind that the engine can be started by
any of the vehicle occupants if there is a KEY- LESS-GO key in the vehicle.
Locking/unlocking centrally
You can start, lock or unlock the vehicle using
KEYLESS-GO. To do this, you only need carry
the SmartKey with you. You can combine the functions of KEYLESS-GO with those of a con-
ventional SmartKey. Unlock the vehicle by
using KEYLESS-GO, for instance, and lock it
using the &button on the SmartKey.
When locking or unlocking with KEYLESS-GO,
the distance between the key and the corre-
sponding door handle must not be greater
than 3 ft (1 m).
A check which periodically establishes a radio
connection between the vehicle and the
SmartKey determines whether a valid Smart- Key is in the vehicle. This occurs, for example:
R when the external door handles aretouched
R when starting the engine
R while the vehicle is in motion
X To unlock the vehicle: touch the inner
surface of the door handle.
X To lock the vehicle: touch sensor sur-
face :.
X Convenience closing feature: touch
recessed sensor surface ;for an exten-
ded period.
Further information on the convenience
closing feature ( Ypage 85).
X To unlock the trunk lid: pull the handle on
the trunk lid.
The vehicle only unlocks the trunk lid.
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.
X To change the setting: press and hold
down the %and& buttons simulta-
neously for approximately six seconds until the battery check lamp flashes twice( Y page 75).
iIf the setting of the locking system is
changed within the signal range of the vehi- cle, pressing the &or% button:
R locks or
R unlocks the vehicle
SmartKey73
Opening and closing
Z

The SmartKey now functions as follows:
X To unlock the driver's door: press the
% button once.
X To unlock centrally: press the%but-
ton twice.
X To lock centrally: press the&button.
The KEYLESS-GO function is changed as fol- lows: X To unlock the driver's door: touch the
inner surface of the door handle on the
driver's door.
X To unlock centrally: touch the inner sur-
face of the front-passenger door handle.
X To lock centrally: touch the outer sensor
surface on one of the door handles.
X To restore the factory settings: press
and hold down the %and& buttons
simultaneously for approximately 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( Y page 69).
There are several ways to turn off the alarm:
X To turn the alarm off with the SmartKey:
press the %or& button on the
SmartKey.
or
X Insert the SmartKey into the ignition lock.
or
X To deactivate the alarm with KEYLESS- GO: press the Start/Stop button in the igni-
tion lock. The SmartKey must be in the vehicle. or
X Lock or unlock the vehicle using KEYLESS-
GO. The SmartKey must be outside thevehicle.
If you unlock the vehicle using the mechanical key, the fuel filler flap will not be unlockedautomatically. X To unlock the fuel filler flap: insert the
SmartKey into the ignition lock.
Removing the mechanical key
X Push release catch :in the direction of
the arrow and at the same time remove
mechanical key ;from the SmartKey.
For further information about: R unlocking the driver's door ( Ypage 80)
R unlocking the trunk ( Ypage 82)
R locking the vehicle ( Ypage 80)
Inserting the mechanical key
X
Push mechanical key ;completely into
the SmartKey until it engages and 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
74SmartKey
Opening and closing

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
X Press the &or% button.
The battery is working properly if battery
check lamp :lights up briefly.
The battery is discharged if battery checklamp :does not light up briefly.
X Change the battery ( Ypage 75).
iIf the SmartKey battery is checked within
the signal reception range of the vehicle,
pressing the &or% button:
R locks or
R unlocks 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.
X Take the mechanical key out of the Smart-
Key ( Ypage 74).
X
Press mechanical key ;into the SmartKey
opening in the direction of the arrow until
battery compartment cover :opens. Do
not hold battery compartment cover :
closed while doing so.
X Remove battery compartment cover :.
X
Repeatedly tap the SmartKey against your
palm until battery =falls out.
X Insert the new battery with the positive ter-
minal facing upwards. Use a lint-free cloth
to do so.
X Make sure that the surface of the battery is
free of lint, grease and other contaminants.
X Insert the front tabs of battery compart-
ment cover :into the housing and then
press to close it.
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.
X Check the SmartKey battery ( Ypage 75) and replace it if nec-
essary ( Ypage 75).
If this does not work:
X Unlock ( Ypage 80) or lock ( Ypage 80) the vehicle using the
mechanical key.
The SmartKey is faulty.
X Unlock ( Ypage 80) or lock ( Ypage 80) the vehicle using the
mechanical key.
X Have 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.
X Lock/unlock the vehicle using the remote control function of
the SmartKey. To do this, hold the SmartKey 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: X Unlock ( Ypage 80) or lock ( Ypage 80) the vehicle using the
mechanical key.
KEYLESS-GO is malfunctioning.
X Lock/unlock the vehicle using the remote control function of
the SmartKey.
X Have KEYLESS-GO checked at a qualified specialist workshop.
If the vehicle can also not be locked/unlocked using the remote
control function: X Unlock ( Ypage 80) or lock ( Ypage 80) the vehicle using the
mechanical key.
X Have KEYLESS-GO checked at a qualified specialist workshop.
You have lost a Smart- Key.XHave the SmartKey deactivated at a qualified specialist work- shop.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well.
You have lost the
mechanical key.XReport the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well.
SmartKey77
Opening and closing
Z

Display messagesPossible causes/consequences andMSolutions
The roof has been opened and closed several times in a row. The
roof drive has been switched off automatically for safety reasons.
You can open and close the roof again after approximately ten
minutes.
X Switch off the ignition and turn it back on.
X Repeat the opening or closing procedure ( Ypage 88).
Close Rear
Side Windows
You leave the vehicle and at least one of the rear side windows is
open.
X Close the rear side windows ( Ypage 84).
¥
Check Washer Fluid
The washer fluid level in the washer fluid reservoir has dropped
below the minimum.
X Add washer fluid ( Ypage 283).
Wiper MalfunctionZ
ing
The windshield wipers are malfunctioning.
X Visit a qualified specialist workshop.
Hazard Warning
Flashers MalfuncZ
tioning
The hazard warning lamps are faulty.
X Visit a qualified specialist workshop.
SmartKey
Display messagesPossible causes/consequences and MSolutions
Â
Key Does Not
Belong to Vehicle
You have put the wrong SmartKey in the ignition lock.
X Use the correct SmartKey.
Â
TakeYourKeyfrom
Ignition
The SmartKey is in the ignition lock.
X Remove the SmartKey.
Â
Obtain a New Key
The SmartKey needs to be replaced.
X Visit a qualified specialist workshop.
Â
ReplaceKeyBattery
The key batteries are discharged.
X Change the batteries ( Ypage 75).
242Display messages
On-board computer and displays