
Acoustic warning signals
Problem Possible causes/consequences and
M SolutionsOnce the anti-theft
warning system* has
been armed, a visual
and audible alarm is
triggered. The alarm is triggered when
R
someone opens a door or the tailgate
R the driver’s door is unlocked with the key (Y page 176)
R the vehicle’s interior is entered
R there is motion inside the vehicle
R the vehicle is raised
To cancel the alarm:
X Insert the key in the starter switch.
X Turn the key to starter switch position 1.
or
X Press button # or * on the key.A warning signal
sounds. The door is opened while a gear is engaged with the engine
running and neither the brake nor accelerator pedals are
depressed.
X
Close the driver’s and passenger door.
X Move the gear selector lever to park position P.
or
X Turn off the engine. You open the driver’s door with the key in starter switch
position 0 to remind you not to leave the key in the vehicle.
X
Close the driver’s door.
or
X Remove the key from the starter switch. A warning signal
sounds. The seat belts are not fastened when the engine is started. For
details, see seat belt telltale (
Y page 165).
X Fasten your seat belts. What to do if ...
175>> Practical hints.
* optional Z

Problem Possible causes/consequences and
M SolutionsA warning signal
sounds when parking. You have not engaged the parking brake before releasing the
brake pedal, turning off the engine, and switching off the
ignition.
X
Switch on the ignition to deactivate the acoustic warning.
X Engage the parking brake.
X Make sure the gear selector lever is in park position P.
X Turn the key to starter switch position 0.
X Remove the key from the starter switch.
For safety, it is important that you perform the parking
procedure as described (Y page 80). You can hear a
continuous
noise from
the front axle when
braking. The vehicle is equipped with a mechanical/acoustic brake pad
indicator.
X
Have the brake pads checked at an authorized smart center. Unlocking/locking manually
Unlocking the vehicle
You can unlock the driver’s door and the
fuel filler flap by unlocking the driver’s
door using the key. The lock cylinder is
fitted with a cap.
X Press button # on the key.
The anti-theft warning system* is
disarmed.
i If the transmitter battery in the key is
discharged, the anti-theft warning
system* can no longer be disarmed with
button # on the key.
For replacing the transmitter battery
(Y page 177).
Unlocking the vehicle with the key and
opening a door or the tailgate will
trigger the anti-theft warning system*
(Y page 48).
To cancel the alarm:
X Insert the key in the starter switch.
X Turn the key to starter switch position 1. X
Remove cap : from lock cylinder ;.
X Unlock the driver’s door.
The
driver’s door and the fuel filler flap
are unlocked.
i To unlock the vehicle centrally press
the
central unlocking switch in the upper
center console ( Y page 27). Locking the vehicle
If
you can no longer lock the vehicle using
the remote control and you do not have a
spare transmitter battery at hand, please
proceed as follows: 176
Unlocking/locking manually
>> Practical hints.
* optional

X
Open the driver’s door.
X Press the central locking switch
(Y page 54).
The indicator lamp on the central
locking
switch comes on, when the starter
switch is in position 1.
The indicator lamp on the central
locking switch flashes, when the starter
switch is in position 0.
X Remove the key from the starter switch,
take it with you, and close all doors.
The vehicle is now locked and the anti-
theft warning system* is armed. Closing the rear soft top
If the rear soft top does not lock properly
after being closed, proceed as follows:
X Stop the vehicle in a safe location.
X Engage the parking brake.
X Make sure the key is in starter switch
position 1.
X Fold up the rear soft top completely.
The rear soft top stops in the unlocked
position.
X Within one minute, press and hold symbol
G on the retractable soft top switch
for 15 seconds twice.
The rear soft top closes the locking
hooks.
X Close the retractable soft top
completely.
X Have the rear soft top checked at an
authorized smart center. Replacing transmitter battery
Notes
The
remote control’s transmitter battery is
almost spent when the turn signals flash
rapidly nine times in a row when locking
the vehicle. i
If you do not replace the transmitter
battery, after about 100 more times you
will no longer be able to lock or unlock
the vehicle using the remote control.
X Replace the transmitter battery.
or
X Have the transmitter battery replaced at
an authorized smart center. G
WARNING
Batteries contain poisonous and corrosive
substances. Therefore keep the batteries
out of reach of children.
If
a battery is swallowed, seek medical help
immediately.
Batteries contain materials that can harm
the environment if disposed of improperly.
Recycling of batteries is the preferred
method of disposal. Many states/provinces
require sellers of batteries to accept old
batteries for recycling. Replacing battery
Replacement battery: CR 2016 button cell
! Replace the remote control’s
transmitter battery every two years at
the
latest. Otherwise there is a danger of
leakage. The remote control could be
damaged. Replacing transmitter battery
177
>> Practical hints.
* optional Z

Replacing bulbs for front lamps
Before you start to replace a bulb for a
front lamp, do the following first:
X Turn the exterior lamp switch to position
$ (Y page 64).
X Switch off the ignition.
X Open the service flap (Y page 120). Left headlamp, (right headlamp in reverse)
Parking and side marker lamp bulb
X
Removing:
Driver’s
side: Turn bulb socket ? toward
the outside.
Passenger side: Turn bulb socket ?
toward the outside.
X Pull bulb socket ? out of the headlamp
housing.
X Pull the bulb out of bulb socket ?.
X Installing:
Insert the new bulb into bulb
socket ?.
X Insert bulb socket ? into the headlamp
housing.
X Driver side: Turn bulb socket ? toward
the inside.
Passenger side: Turn bulb socket ?
toward the inside.
Low‑beam headlamp bulb X
Removing: Take off low‑beam headlamp
cover =.
X Detach the electrical connector. X
Bend the retainer spring end down and
forward until it unclips. Fold the
retainer spring back.
X Pull the bulb out of the headlamp
housing.
X Installing: Insert the new bulb into the
headlamp housing.
X Fold the retainer spring forward.
X Bend the retainer spring end forward
then up and back to clip in.
X Attach the electrical connector.
X Reinstall low‑beam headlamp cover =.
High‑beam headlamp bulb X
Removing: Take off high‑beam headlamp
cover ;.
X Detach the electrical connector.
X Tilt the bulb socket down and pull it out.
X Pull the bulb out of the bulb socket.
X Installing: Insert the new bulb into the
bulb socket.
X Fit the bulb so that the retaining lug of
the base plate is pointing up.
X Press the bulb into the bulb socket until
it is fully engaged.
X Attach the electrical connector.
X Reinstall high‑beam headlamp cover ;.
Front turn signal lamp bulb X
Removing: Turn bulb socket :
counterclockwise
by a quarter of turn and
pull it out of the headlamp housing.
X Press gently onto the bulb and turn it
counterclockwise.
X Pull the bulb out of bulb socket :.
X Installing:
Insert the new bulb into bulb
socket :.
X Press gently onto the bulb and turn it
clockwise.
X Insert bulb socket : into the headlamp
housing. Replacing bulbs
181
>> Practical hints. Z

The arrow on bulb socket : must be in
line with the line on the headlamp
housing.
X Turn bulb socket : clockwise by a
quarter of turn.
Side turn signal lamp bulb X
Removing: Open the door on the
corresponding side. X
Press on retaining lug : in the
direction of the arrow until the side turn
signal lamp housing disengages.
X Close the door.
X Use a suitable tool to loosen the side turn
signal lamp housing from the fender.
X Turn the bulb socket counterclockwise
and pull it out of the side turn signal
lamp housing.
X Pull the bulb out of the bulb socket.
X Installing: Insert the new bulb into the
bulb socket.
X Insert the bulb socket into the side turn
signal lamp housing and turn the bulb
socket clockwise.
X Fit the side turn signal lamp housing
onto the fender.
X Press gently onto the side turn signal
lamp housing.
The side turn signal lamp housing must
audibly engage. Replacing bulbs for rear lamps
Before
you start to replace a bulb for a rear
lamp, do the following first:
X Turn exterior lamp switch to position
$ (Y page 64).
X Switch off the ignition.
Tail lamp unit X
Removing:
Coupé: Open the upper tailgate.
X Open the lower tailgate.
X Cabriolet: Open the rear soft top
(Y page 74).
X Remove the side cover in the cargo
compartment on the corresponding side.
X Fold the damping material forward, if
necessary. Left bulb carrier illustrated as example
:
Retaining tab
; Electrical connector
X Press retaining tab : in the center of
the bulb carrier upwards.
X Pull the bulb carrier out of the tail lamp
housing.182
Replacing bulbs
>> Practical hints.

Left bulb carrier with bulb sockets (right bulb
carrier in reverse)
:
Retaining tab
= Brake, tail, turn signal and side marker
lamp bulb
? Backup lamp bulb
X Depending on which bulb needs to be
replaced, press gently onto bulb =
or ? and turn it counterclockwise.
X Pull the bulb out of the bulb socket.
X Installing: Insert the new bulb into the
bulb socket.
X Press gently onto the bulb and turn it
clockwise until it engages.
X Insert the bulb carrier into the tail lamp
housing.
X Press gently onto the bulb carrier.
Let retaining tab : engage.
X Fold the damping material backward, if
necessary.
X Reinstall the side cover in the cargo
compartment. High-mounted brake lamp X
Removing: Unscrew retaining screws :.
X Remove high-mounted brake lamp ?.
X Detach electrical connector ;
from bulb
socket =.
X Turn the bulb counterclockwise and pull
it out of its socket.
X Installing: Install in the reverse order.
License plate lamps G
WARNING
High outside temperature, stop-and-go
traffic, driving on long uphill grades, or
driving
at high engine speed may increase
the temperature in the engine
compartment. Therefore the area around the
air slots in the rear apron may be hot. Let
the engine cool off before touching this
area to prevent burns. Replacing bulbs
183
>> Practical hints. Z

Wheel change
Preparing the vehicle
X Park the vehicle on a hard, flat surface
when possible.
X Turn on the hazard warning flasher.
X Turn the steering wheel so that the front
wheels
are in a straight-ahead position.
X Engage the parking brake.
X Move the gear selector lever to park
position P.
X Turn off the engine.
X Have any passenger exit the vehicle at a
safe distance from the roadway. Removing the wheel
G
WARNING
When jacking up the vehicle, only use a
suitable jack. Observe the manufacturer’s
safety instructions.
The jack must be designed for jacking up
this vehicle at the jack take-up brackets
built into both sides of the vehicle.
The jack is intended only for lifting the
vehicle
briefly for wheel changes. It is not
suited for performing maintenance work
under the vehicle. To help avoid personal
injury, use the jack only to lift the vehicle
during a wheel change.
Never get beneath the vehicle while it is
supported by the jack. Keep hands and feet
away from the area under the lifted vehicle.
Always lower the vehicle onto sufficient
capacity jackstands before working under
the vehicle.
Always firmly engage the parking brake and
block the wheels with wheel chocks or other
sizeable objects before raising the
vehicle with the jack. Do not release the
parking brake while the vehicle is raised.
Make sure the ground on which the vehicle
is standing and where you place the jack is solid, level and not slippery. If necessary,
use
a large underlay. On slippery surfaces,
such as tiled floors, you should use a non-
slip underlay, for example a rubber mat.
Do not use wooden blocks or similar objects
to support the jack. Otherwise the jack may
not be able to achieve its load-bearing
capacity if it is not at its full height.
The jack must always be vertical when in
use. Always try to use the jack on level
surface. If you do not position the jack
correctly, the vehicle can fall off the jack
and seriously or fatally injure you or
others.
Never start the engine when the vehicle is
raised.
Also observe the notes on the jack.
X Make sure to have a suitable jack 18
,
wheel
wrench 18
and wheel chock 18
.
Contact an authorized smart center for
information on which jack and wheel
wrench are required.
X Prepare the vehicle as described
(Y page 194).
X Make sure the surface is level.
Prevent the vehicle from rolling away by
blocking
wheels with wheel chocks or other
sizeable objects:
X Place one wheel chock or other sizeable
object in front of and another wheel
chock or other sizeable object behind
the wheel that is diagonally opposite to
the wheel being changed.
18 Not included and not available as factory equipment.194
Wheel change
>> Practical hints.

key is in the starter switch. Otherwise
the alternator and other electronic
components could be severely damaged.
Have the battery checked regularly at an
authorized smart center.
Refer to Maintenance Booklet for
maintenance intervals or contact an
authorized smart center for further
information.
! Never invert the terminal connections! Disconnecting, removing, charging,
reinstalling and reconnecting the
battery
Disconnecting the battery i
If the battery is disconnected or
discharged
R the key will not turn in the starter
switch
R the automatic transmission will
remain in park position P
For more information see “Jump
starting” ( Y page 199).
X Engage the parking brake.
X Move the gear selector lever to park
position P.
X Turn off all electrical accessories.
X Turn off the engine.
X Open the passenger door.
X Move the passenger seat to the rear as far
as possible.
X Unscrew the carpet holder in the
passenger footwell (Y page 158).
X Lift the carpet. X
Unscrew fastening screw ;
counterclockwise.
X Pull footrest : sideways out of the
vehicle.
X Read and observe safety instructions and
precautions (Y page 196). !
Always disconnect the battery in the
order described below. Otherwise the
vehicle’s electronics can be damaged.
X Disconnect the battery negative lead
from negative terminal =.
Make sure the negative lead does not
come
into contact with the positive lead.
X Remove cover ? from the positive
terminal.
X Disconnect the battery positive lead.
Removing the battery X
Unscrew battery mount A.
X Remove the battery support and bracket.
X Pull out the ventilation hose from the
battery (depending on battery198
Battery
>> Practical hints.