Arming and disarming the alarm
system
When you unlock or lock the vehicle, either
with the remote control, Comfort Access or at
the door lock the alarm system is disarmed or
armed at the same time.
Door lock and armed alarm systemUnlocking via the door lock will trigger the
alarm on some country-specific versions.
Trunk lid and armed alarm system The trunk lid can be opened even when the
alarm system is armed.
After the trunk lid is closed, it is locked and
monitored again when the doors are locked.
The hazard warning system flashes once.
Panic mode
You can trigger the alarm system if you find
yourself in a dangerous situation.
Press button on the remote control for
at least 3 seconds.
To switch off the alarm: press any button.
Indicator lamp on the interior rearview
mirror▷The indicator lamp flashes briefly every
2 seconds:
The system is armed.▷The indicator lamp flashes after locking:The doors, hood or trunk lid is not closed
properly, but the rest of the vehicle is se‐
cured.
After 10 seconds, the indicator lamp
flashes continuously. Interior motion sen‐
sor and tilt alarm sensor are not active.
When the still open access is closed, inte‐
rior motion sensor and tilt alarm sensor will
be switched on.▷The indicator lamp goes out after unlock‐
ing:
The vehicle has not been tampered with.▷The indicator lamp flashes after unlocking
until the engine ignition is switched on, but
no longer than approx. 5 minutes:
An alarm has been triggered.
Tilt alarm sensor The tilt of the vehicle is monitored.
The alarm system responds in situations such
as attempts to steal a wheel or when the car is
towed.
Interior motion sensor The interior is monitored to the height of the
seats. The alarm system is armed together
with the interior motion sensor even when the
convertible top is open. Falling objects such as
leaves can trigger the alarm unintentionally.
Avoiding unintentional alarms The tilt alarm sensor and interior motion sen‐
sor can be switched off together, such as in
the following situations:
▷In automatic car washes.▷In duplex garages.▷During transport on trains carrying vehi‐
cles, at sea or on a trailer.▷With animals in the vehicle.Seite 45Opening and closingControls45
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Convertible top
General information The convertible top can be opened or closed
at speeds up to approx. 25 mph/40 km/h.
If the vehicle is accelerated above a speed of
approx. 30 mph/50 km/h while the convertible
top is being moved, the convertible top move‐
ment stops.
Hints▷The trunk lid cannot be opened if the
convertible top is not fully opened or
closed.▷If possible, close the convertible top when
the vehicle is parked. A closed convertible
top protects it from weather-related dam‐
age and to some extent from theft.▷Event when the convertible top is closed,
only store valuables in the locked trunk.▷At higher speeds, vacuum produced in the
vehicle interior causes the convertible top
to begin to flutter. Increase the amount of
air via the automatic climate control so that
no vacuum is produced in the vehicle.▷It is not possible to start the engine and
operate the convertible top simultane‐
ously. When the engine is started using the
Start/Stop button or using the Auto Start/
Stop function, the convertible top move‐
ment is briefly interrupted.Overview1Switch2LEDs
Functional requirements
The ignition or radio-ready state must be
switched on.
The following requirements must be fulfilled in
order to be able to move the convertible top.
▷The trunk partition is flipped down.▷The trunk lid is closed.▷The external temperature is above
14 ℉/-10 ℃.▷The voltage of the vehicle electrical system
is sufficient.▷The convertible top drive is not overheat‐
ing.▷The vehicle speed is not too high.▷The windows can be lowered.
If this requirement is not met, a check control
message is displayed.
Safety information Do not open convertible top at low tem‐
peratures
With temperatures below +14 ℉/-10 ℃ do not
open the convertible top; otherwise damages
could result.◀
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Allow wet convertible top to dry
Do not leave the open convertible top in
the convertible top well longer than one day
while the top is still wet; otherwise, damage
could result due to moisture.◀
Note the swivel range of the convertible
top
The convertible top pivots up during opening
and closing. When the top is moved, e.g., in
garages, make sure that there is a minimum
height of 79 inches/2 meters; otherwise, it
damages may result.◀
Do not place objects on the convertible
top
Do not place any objects on the convertible
top, otherwise, they could fall and cause dam‐
age or injuries.◀
No convertible top movement when roll‐
over protection is activated
Do not move the convertible top when rollover
protection is activated; otherwise, it may result
in damage to the convertible top.◀
Open and close convertible top com‐
pletely
Always open or close the convertible top com‐
pletely. Convertible top and convertible top
well storage cover are locked in the final posi‐
tions. Driving with the convertible top or
convertible top well storage cover unlocked
can result in damage.◀
Do not reach into the convertible top
mechanism
Do not reach into the convertible top mecha‐
nism during the opening and closing operation.
Keep children away from the opening path of
the convertible top, otherwise, there is a risk of injury.◀Observe traffic during operation
When the convertible top is opened while
driving, be alert to traffic; otherwise, it may re‐
sult in an accident. If possible, do not move the
convertible top while driving in reverse be‐
cause rearward vision is severely impaired
while the convertible top is in motion. During
windy conditions, do not operate the
convertible top while driving.
Do not drive faster than 30 mph/50 km/h; oth‐
erwise, vehicle damage may occur.◀
Do not attach any roof carrier systems to
the convertible top
Do not attach any roof carrier systems; other‐
wise, an accident may occur.◀
Do not operate convertible top on un‐
even sections or road
Do not open or close convertible top on un‐
even sections of road. Otherwise, the vibra‐
tions can result in damage to the convertible
top.◀
Before opening and closing▷Follow the safety instructions for the
convertible top.▷Make sure that the trunk partition in the
trunk is folded down.▷Make sure that the cargo does not push
against the trunk partition from below.▷Make sure that the trunk lid is closed.
Opening and closing from the inside
In order to protect the battery, move the
convertible top only when the engine is run‐
ning if possible.
Before closing the convertible top, remove any
foreign objects from the windshield frame; oth‐
erwise, closing may be prevented.
▷Press and hold the switch. The
windows are rolled down, and theSeite 49Opening and closingControls49
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Activating1. Slide the switch to the driver's side
mirror position.2.Engage selector lever position R.
Deactivating
Slide the switch to the passenger side mirror
position.
Fold in and out Press button.
Possible at speeds up to approx.
15 mph/20 km/h.
E. g. this is advantageous
▷In car washes.▷In narrow streets.▷For folding mirrors back out that were
folded away manually.
Mirrors that were folded in are folded out auto‐
matically at a speed of approx.
25 mph/40 km/h.
Fold in the mirror in a car wash
Before washing the car in an automatic
car wash, fold in the exterior mirrors by hand or
with the button; otherwise, the mirrors could
be damaged, depending on the width of the
vehicle.◀
Automatic heating
Both exterior mirrors are automatically heated
whenever the engine is running.
Automatic dimming feature Both exterior mirrors are automatically dim‐
med. Photocells are used to control the Interior
rearview mirror, refer to page 64.
Interior rearview mirror, automatic
dimming feature
The concept
Photocells are used for control:
▷In the mirror glass.▷On the back of the mirror.
Functional requirement For proper operation:
▷Keep the photocells clean.▷Do not cover the area between the inside
rearview mirror and the windshield.
Steering wheel
Note Do not adjust while driving
Do not adjust the steering wheel while
driving; otherwise, an unexpected movement
could result in an accident.◀
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DrivingVehicle features and options
This chapter describes all standard, country-
specific and optional features offered with the
series. It also describes features that are not
necessarily available in your car, e. g., due to
the selected options or country versions. This
also applies to safety-related functions and
systems. The respectively applicable country
provisions must be observed when using the
respective features and systems.
Start/Stop button The concept Pressing the Start/Stop button
switches the ignition on or off
and starts the engine.
Steptronic transmission: The
engine starts if the brakes are
stepped on while pressing the Start/Stop but‐
ton.
Ignition on Steptronic transmission: Press the Start/Stop
button without stepping on the brake.
All vehicle systems are ready for operation.
Most of the indicator and warning lights in the
instrument cluster light up for a varied length
of time.
To save battery power when the engine is off,
switch off the ignition and any unnecessary
electronic systems/power consumers.
Ignition offSteptronic transmission: Press the Start/Stop
button again without stepping on the brake.
All indicator lights in the instrument cluster go
out.To save battery power when the engine is off,
switch off the ignition and any unnecessary
electronic systems/power consumers.
P when the ignition is switched off
P is engaged automatically when the ig‐
nition is switched off. When in an automatic car
wash, e.g., ensure that the ignition is not
switched off accidentally.◀
The ignition automatically cuts off while the
vehicle is stationary and the engine is stopped:▷When locking the vehicle, and when the
low beams are activated.▷Shortly before the battery is discharged
completely, so that the engine can still be
started. This function is only available
when the low beams are turned off.▷When opening or closing the driver door, if
the driver's safety belt is unbuckled and
the low beams are turned off.▷While the driver's safety belt is unbuckled
with driver's door open and low beams off.
The low beams switch to parking lights after
approx. 15 minutes of no use.
Radio ready state
Activate radio-ready state:
▷When the engine is running: press the
Start/Stop button.
Some electronic systems/power consumers
remain ready for operation.
The radio-ready state switches off automati‐
cally:
▷After approx. 8 minutes.▷When the vehicle is locked using the cen‐
tral locking system.▷Shortly before the battery is discharged
completely, so that the engine can still be
started.Seite 69DrivingControls69
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The radio-ready state remains active if, e.g.,
the ignition is automatically switched off for the
following reasons:▷Opening or closing the driver's door.▷Unfastening of the driver's safety belt.▷When automatically switching from low
beams to parking lights.
If the engine is switched off and the ignition is
switched on, the system automatically
switches to the radio-ready state if the lights
are turned off or, if correspondingly equipped,
the daytime running lights are activated.
Starting the engine
Hints Enclosed areas
Do not let the engine run in enclosed
areas, since breathing in exhaust fumes may
lead to loss of consciousness and death. The
exhaust gases contain carbon monoxide, an
odorless and colorless but highly toxic gas.◀
Unattended vehicle
Do not leave the vehicle unattended with
the engine running; doing so poses a risk of
danger.
Before leaving the vehicle with the engine run‐
ning, set the parking brake and place the trans‐
mission in selector lever position P or N to pre‐
vent the vehicle from moving.◀
Repeated starting in quick succession
Avoid trying to start the vehicle repeat‐
edly and in quick succession. Otherwise, the
fuel is not burned or is inadequately burned,
posing a risk of overheating and damage to the
catalytic converter.◀
Do not wait for the engine to warm-up while
the vehicle remains stationary. Start driving at
moderate engine speeds.
Steptronic transmission
Starting the engine1.Depress the brake pedal.2.Press the Start/Stop button.
The ignition is activated automatically for a
certain time and is stopped as soon as the en‐
gine starts.
Engine stop
Hints Take the remote control with you
Take the remote control with you when
leaving the vehicle so that children, e.g., can‐
not start the engine.◀
Apply parking brake and further secure
the vehicle if needed.
Set the parking brake firmly when parking; oth‐
erwise, the vehicle could roll. On steep upward
and downward inclines, further secure the ve‐
hicle, e.g., by turning the steering wheel in the
direction of the curb.◀
Before driving into a car wash
So that the vehicle can roll into a car wash ob‐
serve instructions for going into an automatic
car wash, refer to page 232.
Steptronic transmission
Switching off the engine
1.Engage selector lever position P with the
vehicle stopped.2.Press the Start/Stop button.
The engine is switched off.
The radio-ready state is switched on.3.Set the parking brake.Seite 70ControlsDriving70
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Auto Start/Stop function
The concept The Auto Start/Stop function helps save fuel.
The system switches off the engine during a
stop, e.g., in traffic congestion or at traffic lights. The ignition remains switched on. The
engine starts again automatically for driving
off.
Automatic mode After every start of the engine using the Start/
Stop button, the Auto Start/Stop function is in
the last selected state, refer to page 72.
When the Auto Start/Stop function is active, it
is available when the vehicle is traveling faster
than about 3 mph, approx. 5 km/h.
Engine stop
The engine is switched off automatically dur‐
ing a stop under the following conditions:
Steptronic transmission:▷The selector lever is in selector lever posi‐
tion D.▷The brake pedal remains pressed while the
vehicle is stationary or the vehicle is held
by Automatic Hold.▷The driver's safety belt is buckled or the
driver's door is closed.
The air flow from the air conditioner is reduced
when the engine is switched off.
Displays in the instrument cluster The display indicates that the
Auto Start/Stop function is
ready for an Automatic engine
start.
The display indicates that the conditions for an automatic en‐
gine stop have not been met.
Functional limitations
The engine is not switched off automatically in
the following situations:▷External temperature too low.▷The external temperature is high and auto‐
matic climate control is running.▷The car's interior has not yet been heated
or cooled to the required level.▷The engine is not yet at operating temper‐
ature.▷The wheels are at a sharp angle or the
steering wheel is being turned.▷After driving in reverse.▷Fogging of the windows when the auto‐
matic climate control is switched on.▷Vehicle battery is heavily discharged.▷At higher elevations.▷The engine compartment lid is unlocked.▷HDC Hill Descent Control is activated.▷The parking assistant is activated.▷Stop-and-go traffic.▷The selector lever is in position N, M/S or
R.▷Use of fuel with high ethanol content.
Starting the engine
The engine starts automatically under the fol‐
lowing conditions:
▷Steptronic transmission:
By releasing the brake pedal.
When Automatic Hold is activated: press
the accelerator pedal.
After the engine starts, accelerate as usual.
Safety mode
After the engine switches off automatically, it
will not start again automatically if any one of
the following conditions are met.
▷The driver's safety belt is unbuckled and
the driver's door is open.Seite 71DrivingControls71
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▷The hood was unlocked.
Some indicator lights light up for a varied
length of time.
The engine can only be started via the Start/
Stop button.
Functional limitations
Even if driving off was not intended, the deacti‐
vated engine starts up automatically in the fol‐
lowing situations:
▷Excessive warming of the car's interior
when the cooling function is switched on.▷The steering wheel is turned.▷Steptronic transmission: change from se‐
lector lever position D to R, N or M/S.▷Steptronic transmission: change from se‐
lector lever position P to N, D, R or M/S.▷Fogging of the windows when the auto‐
matic climate control is switched on.▷Vehicle battery is heavily discharged.▷Excessive cooling of the car's interior when
the heating is switched on.
Activating/deactivating the system
manually
Using the button
Press button.
▷LED comes on: Auto Start/Stop function is
deactivated.
The engine is started during an automatic
engine stop.The engine can only be stopped or started
via the Start/Stop button.▷LED goes out: Auto Start/Stop function is
activated.
Switching off the vehicle during an
automatic engine stop
During an automatic engine stop, the vehicle
can be switched off permanently, e. g., when
leaving it.
1.Press the Start/Stop button. The ignition is
switched off. The Auto Start/Stop function
is deactivated.
Selector lever position P is engaged auto‐
matically.2.Set the parking brake.
Engine start as usual via Start/Stop button.
Automatic deactivation
In certain situations, Auto Start/Stop function
is deactivated automatically for safety reasons
as if the driver were absent.
Malfunction
The Auto Start/Stop function no longer
switches off the engine automatically. A Check
Control message is displayed. It is possible to
continue driving. Have the system checked.
Parking brake The concept
The parking brake is used to prevent the vehi‐
cle from rolling when it is parked.
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