
Driving
62
Radio readiness and ignition 
switched off
All indicator and warning lamps in the instru-
ment cluster go out.
Starting engine
Do not run the engine in closed rooms, 
otherwise the inhalation of toxic exhaust 
gases can cause unconsciousness and death. 
The exhaust gases contain carbon monoxide, 
an odorless and colorless, but highly toxic gas. 
Never leave an unattended vehicle with the 
engine running, as such a vehicle represents a 
potential safety hazard. 
Before leaving the vehicle with the engine run-
ning, select the idling position, or shift the trans-
mission into position P and firmly apply the 
handbrake, otherwise the vehicle can begin to 
roll.<
Avoid frequent starting in quick succes-
sion or repeated starting attempts in 
which the engine does not start. Otherwise, the 
fuel is not burned or inadequately burned and 
there is a danger of overheating and damaging 
the catalytic converter.<
Do not allow the engine to warm up by leaving it 
running while the vehicle remains stationary. 
Instead, begin to drive at a moderate engine 
speed.
Manual transmission
Remote control in ignition lock or with comfort 
access in vehicle, refer to page38.
1.Depress brake pedal.
2.Depress the clutch pedal and shift into 
idling position.3.Press the Start/Stop button.
Automatic and sport automatic 
transmission*
Remote control in ignition lock or with comfort 
access in vehicle, refer to page38.
1.Depress brake pedal.
2.Press the Start/Stop button.
Switching off engine
When leaving the vehicle, always take the 
remote control with you. 
When parking, firmly apply the handbrake, as 
otherwise the vehicle could roll.<
Manual transmission
1.Press the Start/Stop button with the vehicle 
stopped.
2.Shift into first gear or reverse.
3.Firmly apply the handbrake.
4.Remove the remote control from the igni-
tion lock, refer to page61.
Automatic and sport automatic 
transmission*
1.Shift transmission into position P with the 
vehicle stopped.
2.Press the Start/Stop button.
3.Firmly apply the handbrake.
4.Remove the remote control from the igni-
tion lock, refer to page61.
Before driving into a car wash
The vehicle can roll if you proceed according to 
the following steps:
1.With comfort access: insert the remote con-
trol into the ignition lock.
2.Depress brake pedal.
3.Shift into transmission position N.
4.Switch off the engine.
Transmission position P will be engaged:
>after approx. 30 seconds 

Controls
 71Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
Active cruise control*
With active cruise control you can select a 
desired speed which is then automatically 
maintained when driving on open roadways and 
is varied to maintain a selected distance setting 
to slower moving vehicles ahead.
Active cruise control represents 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 
freeways or other high-speed thoroughfares. 
Especially on longer trips and in traffic conges-
tion, the system can reduce fatigue and tension, 
while increasing your enjoyment of driving. 
Please use it safely and responsibly.
In addition to holding a steady cruising speed, if 
you encounter slower vehicles ahead, active 
cruise control will, within limits, adjust your 
vehicle's speed automatically so that you can 
flow with the traffic without having to make con-
stant adjustments. If, for example, while cruis-
ing at the selected speed, you begin to 
approach a slower vehicle ahead of you in the 
same lane, the system will reduce your vehicle's 
speed to the same as that of the vehicle ahead 
to maintain your selected distance setting. You 
can vary the following distance, which will vary 
with speed. Based on your selected distance 
setting, the system automatically decreases the 
throttle setting and lightly applies the brakes if 
necessary. In addition, if the vehicle ahead of 
you slows to a complete stop, the system can 
follow this action within the given scope and 
can also accelerate from a complete stop if the 
vehicle ahead of you drives off again shortly 
thereafter. During braking, your vehicle brake 
lamps will automatically illuminate to alert a fol-
lowing driver to take action. In addition, it may 
be necessary for your vehicle to downshift the 
automatic transmission to maintain the dis-
tance setting selected. As soon as the road in 
front of you has no moving vehicles, the system 
will accelerate to your desired speed. This set 
speed is also maintained on downhill grades, 
however the vehicle speed can drop below the 
set speed when driving uphill if the engine out-
put is not sufficient.Active cruise control cannot detect stop 
signs, red lights, or any object that is 
stopped or is blocking the road.
Active cruise control is not and must not be 
used as a collision avoidance/warning system.
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, it is necessary that you read 
all of the pages relating to this system before 
use. Carefully read and observe the information 
on the system limitations beginning on page75 
to obtain a good command of the system and its 
range of applications.<
Brake pedal feel
When the system brakes and you also depress 
the brake pedal, a somewhat different braking 
feel results.
Professional* navigation system
If a navigation DVD is in the drive, refer to 
page142, within limits the system adjusts the 
accelerating and braking behavior of the vehicle 
to the road you are driving on.
To ensure that the system is informed of 
the current course of the road, always use 
the latest navigation DVD if possible.<
When the vehicle position is unknown, e. g. 
when you leave the map area, this influence of 
the navigation system is not available.
Applications
Please try the system first during sparse traffic 
and clear road conditions so that you can get 
used to the system. After you have experience 
and understand the system, only then use it 
during normal traffic.
As with conventional cruise control systems, 
active cruise control in no way reduces or sub-
stitutes for the driver's own personal experi-
ence, responsibility, alertness and awareness in 
adjusting speed, braking or otherwise control-
ling the vehicle. The driver should decide when 
to use the system on the basis of road, traffic, 
visibility, and weather conditions. Active cruise 
control is intended for use on highway-type  

Driving
74
While stopped
Before leaving the vehicle with the engine 
running, engage position P of the auto-
matic transmission and apply the handbrake. 
Otherwise the vehicle can roll.<
If a detected vehicle in front of you brakes to a 
complete stop and your vehicle has also been 
braked to a complete stop by the system:
>If the vehicle in front of you drives off while 
the marking1 for the desired speed in the 
speedometer is green, your vehicle will 
accelerate without you having to do any-
thing.
>If the vehicle in front of you drives off while 
the marking1 is orange, you briefly depress 
the accelerator pedal or press button4. 
Rolling bars in the distance indicator3 
mean that the vehicle in front of you has 
driven off.
If you are stopped behind a vehicle with the 
brake pedal depressed and the system is inter-
rupted or deactivated:
1.Press button4 to activate a stored desired 
speed or select a desired speed with the 
lever, arrow1 or arrow2.
2.Release the brake pedal.
3.If the vehicle in front of you drives off, briefly 
depress the accelerator pedal or press 
button4.
Deactivating system
>Press the lever upward or downward twice 
while driving.
>When stopped, do the same with the brake 
pedal depressed.
>Switch off the ignition.
The displays turn off, and the stored desired 
speed and distance are deleted.
Displays in instrument cluster
1Stored desired speed
>Green: the system is active.
>Orange: the system is interrupted.
2Lights up yellow: vehicle detected ahead
Display also used for warnings, please read 
all information on warnings
3Selected distance to vehicle ahead
The indicator lights up as soon as the sys-
tem is activated
The bars roll: the vehicle in front of you has 
driven off
4Brief display of stored desired speed
If the display --- mph/--- km/h appears 
briefly, the conditions necessary for oper-
ation may currently not be met.<
Warning lamps
The indicator2 continuously 
flashes yellow.
The prerequisites for operating the 
system are no longer met, e.g. as a 
result of ABS or DSC interven-
tions. The system brakes until you actively take 
over.
The indicator2 flashes red; a sig-
nal sounds.
The system indicates that you 
must brake and/or maneuver the 
vehicle yourself. The system can-
not automatically restore the distance to the 
vehicle driving ahead. 
However, this display cannot relieve the driver 
of the responsibility for adjusting the desired 
speed and driving style to the traffic conditions. 

Driving
76 situations as the system will neither automati-
cally 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 alertness.<
The system cannot allow the vehicle to drive off 
automatically in situations that make driving off 
considerably more difficult, e.g. on steep uphill 
grades, with a heavy trailer or before raised 
areas in the road.
Near radio astronomy stations, the system 
radar is deactivated at speeds under 20 mph/
30 km/h due to legal regulations.
Be certain to interrupt the system when 
you pull into an exit lane for a highway 
offramp.<
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 that is actually in 
the lane next to yours. Always be ready to take 
action or apply the brakes if necessary.
In addition, the system is interrupted 
whenever the driver applies the vehicle 
brakes, shifts the transmission from drive/D to 
neutral/N, or deactivates DSC. After any inter-
ruption, the system will no longer automatically 
activate the vehicle brakes, which means the 
driver must intervene and resume manual brak-
ing. You should then reactivate the system only 
when you are fully aware of the prior speed and 
distance settings.<
Active cruise control may brake when you 
reduce the stored desired speed; however, the 
driver must constantly monitor traffic and inter-
vene if necessary.
When you switch off the engine or ignition, 
active cruise control is fully switched off, too, 
and any settings you have selected are can-
celed.
Unexpected lane change
If a vehicle in front of you is behind a stopped 
vehicle and unexpectedly changes lanes, you 
must react yourself, as the system does not 
react to stopped vehicles.
Swerving vehicles
When a vehicle swerves out of adjacent lanes 
into your lane, the system does not detect the 
vehicle until it is completely in your lane.
When a vehicle ahead suddenly swerves 
into your lane, the system may not be able 
to restore the selected distance automatically. 
This also applies to great differences in speed 
between your vehicle and vehicles ahead, e. g. 
when quickly approaching a truck. Once the 
system has established that a vehicle is indeed 
in front of you, it will indicate that you must 
brake and/or maneuver the vehicle yourself. 
Take action yourself, otherwise there is a risk of 
an accident.< 

Everything under control
78
Everything under control
Odometer, outside 
temperature display, clock
1Time, outside temperature and date
2Odometer and trip odometer
3Press button:
>with ignition switched on, trip odometer 
is reset
>with ignition switched off, time, outside 
temperature, and odometer are briefly 
displayed.
From radio readiness the outside temperature 
and the time are displayed.
Date retrieval: 
Press CHECK button on turn signal lever, refer 
to page84.
Time and date setting, refer to page86.
You can set the unit of measure 7 or 6 on the 
Control Display, refer to Units of measure on 
page88.
Outside temperature warning
If the display drops to +377/+36, a signal 
sounds and a warning lamp lights up. A mes-
sage appears on the Control Display. There is 
an increased danger of ice.
Even at temperatures above +377/
+36 ice can form. Therefore, drive care-
fully, e.g. on bridges and sections of road in the 
shade, otherwise there is an increased accident 
risk.<
Tachometer
Avoid engine speeds in the white-striped 
advance warning field, arrow1, if possible.
Be sure to avoid engine speeds in the red warn-
ing field, arrow2. At high revs in this range, the 
flow of fuel is interrupted to protect the engine.
Coolant temperature
Should the coolant, and with it the engine 
become too hot, a warning lamp lights up. In 
addition, a message appears on the Control 
Display.
Checking coolant level, refer to page235. 

Controls
 83Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
9.Turn the controller to make the adjustment.
10.Press the controller to apply the setting. 
The year is selected.
11.Turn the controller to make the adjustment.
12.Press the controller to apply the setting. 
The date entry is stored.
To exit the menu: 
 Select the arrow and press the controller.
Check Control
The concept
The Check Control monitors functions in the 
vehicle and issues a message if there is a mal-
function in the monitored systems. This kind of 
Check Control message consists of indicator 
and warning lamps in the instrument cluster, 
and if necessary an acoustic signal and text 
messages at the bottom of the Control Display.
Indicator and warning lamps
The indicator and warning lamps can light up in 
different combinations and colors. means that a Check Control message has 
been generated. The symbol continues to be 
visible even when the Check Control message 
disappears after a short time. The warning 
lamps and text messages are stored and can be 
displayed later, also refer to page84.
Explanatory text messages
Text message at the bottom edge of the Con-
trol Display explain the meaning of the dis-
played indicator and warning lamps.
You can display additional information on most 
Check Control messages later, e.g. on the 
cause of the malfunction and on corresponding 
need for action, see below.
In urgent cases, this information will be shown 
as soon as the corresponding lamp comes on. 

Controls
 85Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
Indication of malfunction urgency
Depending on your vehicle's equipment, the 
stored Check Control messages are also dis-
played with the following symbols:
No malfunctions are present in the moni-
tored systems.
Malfunctions are present in the moni-
tored systems. Depending on the mal-
function, supplementary information is 
shown on the Control Display.
The symbols also indicate the status of the ser-
vice requirements display, refer to page81.
Displays after completion of trip
Malfunction reports generated during the trip 
are shown consecutively when you switch off 
the ignition.
Before the display disappears, you can display 
the messages once again. Press the CHECK 
button for approx. 2 seconds. If several mes-
sages are present, you can continue to press 
the CHECK button to view them in succession.
The display goes out
>after a short time
>when you press the CHECK button again 
for approx. 2 seconds
Speed limit
You can enter a speed and a Check Control 
message indicates when you have reached this 
speed. This enables you, for example, to 
receive warnings if you exceed a speed limit in 
an urban area.You are only warned of reaching this speed a 
second time if your vehicle speed falls below it 
again by at least 3 mph/5 km/h.
Displaying, setting or changing limit
iDrive, for operating principle refer to page16.
1.Open the start menu.
2.Open "Navigation".
Without navigation system
*:
Open "Car Data".
3.Select "Car Data" and press the controller.
4.Select "Limit" and press the controller.
5.Select the speed value and press the con-
troller.
6.Turn the controller to set the limit.
7.Press the controller to apply the setting.
The limit is activated.
Applying your current speed as limit
Select "Select current speed" and press the 
controller. The system adopts your current 
speed as the limit.
Activating/deactivating limit
Select "On" and press the controller.
 The limit is activated.
Stopwatch
iDrive, for operating principle refer to page16.
1.Open the start menu.
2.Open "Navigation".
Without navigation system
*:
Open "Car Data".
3.Select "Car Data" and press the controller. 

Controls
 89Reference
At a glance
Driving tips
Communications
Navigation
Entertainment
Mobility
Technology for comfort, convenience and 
safety
PDC Park Distance Control*
The concept
The PDC assists you when you are parking. 
Acoustic signals and an optical display
* alert 
you to the approach of an object from behind 
your vehicle. To measure the distance, there 
are four ultrasonic sensors in each bumper. 
The range of these sensors is approx. 7 ft/2 m. 
However, an acoustic warning first sounds for 
the sensors at the front and at the two rear cor-
ners at approx. 24 in/60 cm, and for the center 
rear sensors at approx. 5 ft/1.50 m.
PDC is a parking aid that can indicate 
objects when they are approached 
slowly, as is usually the case when parking. 
Avoid approaching an object at high speed, oth-
erwise the physical circumstances would mean 
that the system warning was too late.<
Automatic activation
The system starts to operate approx. one sec-
ond after you shift into reverse or move the 
selector lever into position R with the engine 
running or the ignition switched on.
Wait this short time before driving off.
Manual activation
Press the button, the LED lights up.
Manual deactivation
Press the button again; the LED goes out.
Automatic deactivation
After driving approx. 165 ft/50 m or at over 
approx. 20 mph/30 km/h, the system is 
switched off and the LED goes out. You can 
reactivate the system manually as needed.
Signal tones
When nearing an object, the position is corre-
spondingly indicated by an interval tone. Thus, 
an object detected to the left rear of the vehicle 
will be indicated by a signal tone from the left 
rear speaker, etc. As the distance between 
vehicle and object decreases, the intervals 
between the tones become shorter. If the dis-
tance to the nearest object falls to below 
roughly 1 ft/30 cm, then a continuous tone 
sounds.
An intermittent tone is interrupted after approx. 
3seconds:
>if you remain in front of an object that was 
only detected by one of the corner sensors
>if you drive parallel to a wall
Malfunction
The LED in the button flashes and a message 
appears on the Control Display. PDC is mal-
functioning. Have the system checked.
To prevent this problem, keep the sensors 
clean and free of ice or snow in order to ensure 
that they will continue to operate effectively. Do 
not spray the sensors with high-pressure clean-
ing jets for long periods and maintain a distance 
of at least 4 in/10 cm to them.
PDC with visual warning*
You can also have the system show distances 
to objects on the Control Display. Objects that 
are farther away are already shown there before 
a signal tone sounds. The setting is stored for 
the remote control currently in use.
iDrive, for operating principle refer to page16.