
At a glance
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Indicator and warning lamps
The concept
Indicator and warning lamps can light up in a 
variety of combinations and colors.
Several of the lamps are checked for proper 
functioning and light up temporarily when the 
engine is started or the ignition is switched on.
Text messages
Text messages at the top edge of the Control 
Display describe the meanings of the indicator 
and warning lamps.
Supplementary text messages
You can call up more information on the Control 
Display, e.g. on the cause of a malfunction and 
on how to respond, via Check Control, refer to 
page77.In urgent cases, this information will be shown 
as soon as the corresponding lamp comes on.
Indicator lamps without text messages
The following indicator lamps notify you that 
certain functions are active:
High beams/headlamp flasher95
Fog lamps96
Lamp flashes:
DSC or DTC is regulating the propul-
sive forces in order to maintain driving 
stability83
Parking brake applied56
Canada: parking brake applied56
Engine malfunction with adverse 
effect on emissions218
Canada: engine malfunction with 
adverse effect on emissions218 

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>Settings for the display on the Control Dis-
play and in the instrument cluster:
>12h/24h format of the clock, refer to 
page76
>Date format, refer to page77
>Brightness of the Control Display, refer 
to page80
>Language on the Control Display, refer 
to page79
>Units of measure, refer to page72
>Show visual warning for Park Distance Con-
trol PDC
*, refer to page81
>Light settings:
>Welcome lamps, refer to page93
>Pathway lighting, refer to page94
>Daytime running lights, refer to page94
>High-beam assistant, refer to page95
>Automatic climate control: activating/deac-
tivating AUTO program, cooling function 
and automatic recirculated-air control, set-
ting temperature, air volume and distribu-
tion, refer to page99 ff
>Entertainment:
>Tone control, refer to page146
>Speed-dependent volume control, refer 
to page147
Central locking system
The concept
The central locking system functions when the 
driver's door is closed.
The system simultaneously engages and 
releases the locks on the following:
>Doors
>Trunk lid
>Fuel filler flap
>Convertible: glove compartment
Operating from outside
>Via the remote control>Via the door lock
*
>In cars with Comfort Access*, via the han-
dles on the driver's and front passenger 
doors
In addition, if the remote control is used, the 
welcome lamps, interior lamps and the door's 
courtesy lamps
* are switched on or off. The 
alarm system
* is also armed or disarmed.
For further details of the alarm system,
 refer to 
page32.
Operating from inside
By means of the button for central locking, refer 
to page30.
In the event of a sufficiently severe accident, the 
central locking system unlocks automatically. In 
addition, the hazard warning flashers and inte-
rior lamps come on.
Opening and closing:
Using the remote control
Persons or animals in a parked vehicle 
could lock the doors from the inside. You 
should therefore take the remote control with 
you when you leave the vehicle so that the latter 
can be opened from outside.<
Convertible: to operate the retractable 
hardtop with the remote control, the 
doors and trunk lid must be closed and the 
cargo area partition must be folded down and 
engaged on both sides. Refer also to page38.<
Unlocking
Press the   button.
The interior lamps, the courtesy lamps
* and the 
welcome lamps come on.
Setting unlocking characteristics
You can set whether only the driver's door or 
the entire vehicle is to be unlocked when the 
button is pressed for the first time.
1."Settings"
2."Door locks" 

Opening and closing
32 Make sure that the closing path of the 
trunk lid is clear; otherwise, injuries may 
result.<
Coupe
Convertible
To close the trunk lid, press it down 
lightly. The lid is closed automatically.<
Alarm system*
The concept
The vehicle alarm system responds:
>When a door, the hood or the trunk lid is 
opened
>To movements inside the vehicle: Interior 
motion sensor, refer to page33
>When the car's inclination changes, for 
instance if an attempt is made to jack it up 
and steal the wheels or to raise it prior to 
towing away
>When there has been an interruption of 
power supply from the battery
The alarm system signals unauthorized entry 
attempts for a short time by means of:
>An acoustic alarm>Switching on the hazard warning flashers
>Flashing the high beams
Arming and disarming
When you lock or unlock the vehicle, either with 
the remote control or at the door lock, the alarm 
system is armed or disarmed at the same time.
You can open the trunk lid even when the alarm 
system is armed, by pressing the   button on 
the remote control, refer to page28. The lid is 
locked and monitored again as soon as you 
close it.
Panic mode*
You can trigger the alarm system if you find 
yourself in a dangerous situation:
Press the   button for at least three seconds.
To switch off the alarm: press any button.
Switching off an alarm
>Unlock the car with the remote control, refer 
to page27.
>Insert the remote control all the way into the 
ignition lock.
Indicator lamp displays
>The indicator lamp under the inside rear-
view mirror flashes continuously: the sys-
tem is armed.
>The indicator lamp flashes after locking: 
doors, hood or trunk lid are not properly 
closed. Even if you do not close the alerted 
area, the system begins to monitor the 
remaining areas, and the indicator lamp 
flashes continuously after approx.  

Opening and closing
34 able hardtop, the system is checking whether a 
remote control is inside the vehicle. Please 
repeat the opening or closing procedure, if nec-
essary.<
Unlocking
Grasp the handle on the driver's or front pas-
senger door completely, arrow 1. This corre-
sponds to pressing the  button.
Locking
Touch the surface, arrow 2, with your finger for 
approx. 1 second. This corresponds to pressing 
the button.
To preserve the battery, please make 
sure that the ignition and all electrical 
consumers are switched off before locking the 
vehicle.<
Coupe: Convenient closing
For Convenient closing, keep your finger on the 
surface, arrow 2.
Convertible: window and convertible 
top operation
With the ignition at radio readiness or beyond, 
you can open and close the windows and the 
convertible top when a remote control is 
located inside the vehicle.
Unlocking the trunk lid separately
Press the button on the outside of the trunk lid. 
This corresponds to pressing the  button.
If the vehicle detects that a remote con-
trol has been accidentally left inside the 
locked vehicle's cargo area after the trunk lid is closed, the lid will reopen. The hazard warning 
flashers flash and an acoustic signal
* sounds.<
Switching on radio readiness
Radio readiness is switched on by pressing the 
start/stop button, refer to page55.
Do not depress the brake or the clutch; 
otherwise, the engine will start.<
Starting the engine
You can start the engine or switch on the igni-
tion when a remote control is inside the vehicle. 
It is not necessary to insert a remote control into 
the ignition lock, refer to page55.
Switching off the engine in cars with 
automatic transmission
The engine can only be switched off when the 
selector lever is in position P, refer to page56.
To switch the engine off when the selector lever 
is in position N, the remote control must be in 
the ignition lock.
Malfunction
Comfort Access may malfunction due to local 
radio waves. If this happens, open or close the 
vehicle via the buttons on the remote control or 
using the integrated key. To start the engine 
afterward, insert the remote control into the 
ignition lock.
Warning lamps
The warning lamp in the instrument 
cluster lights up when you attempt to 
start the engine: the engine cannot 
be started. The remote control is not inside the 
vehicle or is malfunctioning.
Take the remote control with you inside the 
vehicle or have it checked. If necessary, insert 
another remote control into the ignition lock.
The warning lamp in the instrument 
cluster lights up while the engine is 
running: the remote control is no 
longer inside the vehicle. After the engine is 
switched off, the engine can only be restarted 
within approx. 10 seconds. 

Driving
62
One lever for all functions
1Storing and maintaining speed or accelerat-
ing
2Storing and maintaining speed or deceler-
ating
3Deactivating cruise control
4Resuming a speed stored beforehand
Maintaining current speed
Tap the lever, arrow 1, or pull it briefly, arrow 2.
The car's current speed is stored and main-
tained. It is displayed on the speedometer and 
briefly in the instrument cluster.
On uphill gradients, it may prove impossible to 
maintain the set speed if current engine power 
output is insufficient. If the engine braking 
effect is insufficient on downhill slopes, the sys-
tem will brake the vehicle slightly.
Increasing desired speed
Repeatedly press the lever to the resistance 
point or beyond, arrow1, until the desired 
speed is reached.
>Each time the lever is pressed to the resis-
tance point, the desired speed is increased 
by approx. 1 mph or 1 km/h.
>Each time the lever is pressed beyond the 
resistance point, the desired speed is 
increased by up to 5 mph or 10 km/h.
The system stores and maintains the speed.
Accelerating using the lever
Accelerating slightly:
Press the lever to the resistance point, arrow 1, 
until the desired speed is reached.
Accelerating significantly:Press the lever beyond the resistance point, 
arrow 1, until the desired speed is reached.
The vehicle accelerates without pressure on 
the accelerator pedal. The system stores and 
maintains the speed.
Decreasing speed
Repeatedly pull the lever to the resistance point 
or beyond, arrow 2, until the desired speed is 
displayed.
>Each time the lever is pulled to the resis-
tance point, the desired speed is decreased 
by approx. 1 mph or 1 km/h.
>Each time the lever is pulled beyond the 
resistance point, the desired speed is 
reduced by up to 5 mph or 10 km/h until the 
minimum speed of 20 mph or 30 km/h is 
achieved.
The system stores and maintains the speed.
Deactivating cruise control
Tap the lever upwards or downwards, arrow3. 
The displays on the speedometer disappear.
In addition, the system is automatically deacti-
vated:
>When you brake the vehicle
>When you switch gears very slowly or shift 
to neutral in cars with manual transmission
>When you select the automatic transmis-
sion's neutral position N
>When you activate DTC or deactivate DSC
>When DSC or ABS is intervening
Cruise control is not deactivated by depressing 
the accelerator pedal. Once the accelerator 
pedal is released, the stored speed is achieved 
again and maintained.
Warning lamp
The warning lamp lights up when 
cruise control is deactivated due to 
control intervention by the DSC, for 
example. A message appears on the Control 
Display. 

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Resuming a speed stored beforehand
Press the button, arrow4. The last stored 
speed is resumed and maintained.
In the following instances, the stored speed is 
deleted and can no longer be resumed:
>When driving stability control systems are 
intervening
>In ca rs  with manua l transmiss ion: when you 
shift gears very slowly or shift to neutral
>In cars with automatic transmission: when 
you engage selector lever position N
>When the ignition is switched off
Displays in the instrument cluster
1Stored speed
2Selected speed is displayed briefly
If --- mph or --- km/h temporarily appears 
in the instrument cluster display, it is pos-
sible that the system prerequisites for operation 
are currently not met. 
Calling up Check Control messages, refer to 
page78.<
Malfunction
The warning lamp comes on when 
the system has failed. A message 
appears on the Control Display. More 
information can be found beginning on 
page77.
Active cruise control*
The concept
With active cruise control, you can select a 
desired speed which is not only automatically maintained when driving on open roadways, but 
also varied to maintain a selected distance set-
ting as slower traffic is encountered.
Active cruise control is a technological advance 
over the familiar cruise control and is a welcome 
relief from the constant adjustment of speed 
that can accompany driving in traffic on high-
ways or other high-speed thoroughfares. Espe-
cially on longer trips, the system can reduce 
fatigue and tension, while increasing your 
enjoyment of driving. Please use it safely and 
responsibly.
Within the limits of its capability, the system 
automatically adapts the car's speed to that of a 
slower vehicle in front of you. You can specify 
the distance to be maintained from the vehicle 
in front in four stages. For safety reasons, the 
distance is speed-dependent. Based on your 
selected distance setting, the system automat-
ically decreases the throttle setting and lightly 
applies the brakes if necessary. The vehicle 
brake lamps will automatically illuminate to sig-
nal a following driver to take action. In addition, 
it may be necessary for the vehicle or the driver 
to downshift, depending on the kind of trans-
mission your vehicle is equipped with, to main-
tain the distance setting selected. If the vehicle 
ahead speeds up or when the lane ahead 
becomes clear, your vehicle will accelerate to 
the speed you have selected by increasing the 
throttle setting and shifting gears automatically 
or by the driver as needed. Your selected speed 
will be held when driving downhill, too.
Since this active cruise control system is a new 
technology and operates differently from con-
ventional cruise control systems which you may 
be accustomed to, you are strongly urged to 
read all of the pages relating to this system 
before use. Pay special attention to the System 
limitations section beginning on page67.
Braking sensation
>If you step on the brake pedal while the sys-
tem is braking, pedal sensation will be 
slightly different from the usual.
>Possible noises during automatic braking 
are normal. 

Driving
66
Resuming stored desired speed and 
distance
Briefly press the button, arrow 4. 
The stored speed and distance are regained 
and maintained.
In the following instances, the stored speed is 
deleted and can no longer be resumed:
>When driving stability control systems are 
intervening
>In cars  with ma nual trans mis sio n: when you 
shift gears very slowly or shift to neutral
>In cars with automatic transmission: when 
you engage selector lever position N
>When the ignition is switched off
Displays in the instrument cluster
1Stored desired speed
2Shows yellow: vehicle detected ahead
Flashes in red: system cannot maintain dis-
tance; driver must brake the vehicle
Flashes in yellow: driving stability control 
systems are intervening; cruise control is 
deactivated
3Selected distance to vehicle ahead
The indicator lights up as soon as the sys-
tem is activated.
4Selected desired speed is temporarily dis-
played
If --- mph or --- km/h temporarily appears 
in the instrument cluster display, it is pos-
sible that the system prerequisites for operation are currently not met. Calling up Check Control 
messages, refer to page78.<
Warning lamps
The indicator2 flashes in red; a 
signal sounds. 
The system indicates that you 
must brake and/or maneuver the 
vehicle yourself. Active cruise con-
trol cannot automatically restore the distance to 
the vehicle ahead. 
This indicator does not release you from your 
responsibility to adapt your desired speed and 
driving style to prevailing driving conditions.
The indicator 2 flashes in yellow. 
The prerequisites for operating 
active cruise control are not met, 
e.g. as a result of ABS or DSC 
interventions. Active cruise control 
is deactivated. You can reactivate the system, if 
desired, by tapping or pulling the lever when 
road and traffic conditions permit. It is not pos-
sible to resume a stored speed.
Radar sensor
The sensor's ability to detect vehicles ahead 
may be restricted as a result of heavy rain, dirt, 
snow or ice. If necessary, clean the radar sensor 
located in the front bumper, see arrow. Be sure 
to use particular care when removing any layers 
of snow or ice from the sensor.
The system cannot be activated if the sensor is 
incorrectly aligned.
For US owners only
The transmitter and receiver units comply with 
part 15 of the FCC/Federal Communications  

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Commission regulations. Operation is gov-
erned by the following:
FCC ID:
NF3 ACC2SCU 003YK04001 0000
Compliance statement:
This device complies with part 15 of the FCC 
Rules. Operation is subject to the following two 
conditions:
>This device must not cause harmful inter-
ference, and>this device must accept any interference 
received, including interference that may 
cause undesired operation.
Any unauthorized modifications or 
changes to these devices could void the 
user’s authority to operate this equipment.<
Malfunction
The warning lamp comes on when 
the system has failed. A message 
appears on the Control Display. More 
information can be found beginning on 
page77.
System limitations
Always remember that the range and abil-
ity of the system does have physical limi-
tations. It will not apply the brakes or decelerate 
your vehicle when there is a slow-moving vehi-
cle, stopped vehicle or stationary object ahead 
of you, as for example, at a traffic light or a 
parked vehicle. Also, the system does not react 
to oncoming traffic, pedestrians or other types 
of potential traffic such as a rider on horseback. 
It is also possible that the system may not 
detect smaller moving objects such as motor-
cycles or bicycles. Be especially alert when 
encountering any of these situations as the sys-
tem will neither automatically brake, nor provide 
a warning to you. Also, be aware that every 
decrease in the distance setting allows your 
vehicle to come closer to a vehicle in front of 
you and requires a heightened amount of alert-
ness.<
Active cruise control is not and must not 
be used as a collision avoidance/warning 
system.
up or the lane ahead becomes clear, then your 
vehicle will accelerate to the speed you have 
selected. Be aware that changing to a clear, 
unobstructed lane will also result in your vehicle 
accelerating.
Be certain to deactivate the system when 
you pull into an exit lane for a highway off-
ramp.<
Also, vehicles traveling in a staggered manner 
on a highway may cause a delay in the system's 
reaction to a vehicle in front of you or may cause 
the system to react to a vehicle actually in the 
lane next to you. Always be ready to take action 
or apply the brakes if necessary.
While active cruise control is capable of 
braking your vehicle automatically when 
you approach a slower vehicle ahead, it is 
important to be aware that the ability of the sys-
tem to apply the brakes is also limited, e.g. 
when you reduce your desired speed sharply.