Controls
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To prevent the vehicle from creeping
after you select a driving position,
maintain pressure on the brake pedal until
you are ready to start.<
An interlock prevents inadvertent gearshifts
into selector-lever positions R and P. To cancel
the interlock, press the button on the front of
the selector-lever knob, refer to arrow.
P Park
Select only when the vehicle is stationary.
The rear wheels are locked.
R Reverse
Select only when the vehicle is stationary.
N Neutral
You can select N in car washes, for example.
The vehicle can roll.
D Drive, automatic position
Position for normal vehicle operation.
All forward gears are available.
Under normal operating conditions, the fuel
consumption is lowest when driving in posi-
tion D.
Kick-down
The kick-down mode provides maximum accel-
eration:
Press the accelerator pedal beyond the full-
throttle resistance point.
Sport program and manual
operation M/S
Move the selector-lever from position D to the
left into shifting slot M/S:
The Sport program is activated and DS appears
in the instrument cluster. This position is rec-
ommended for a performance-oriented driving
style. It is engaged automatically when the
Dynamic Driving Control is activated, refer to
Dynamic Driving Control.
When the selector-lever is briefly moved for-
ward or back, the manual mode is activated and
the Steptronic shifts gear. The instrument clus-
ter shows M1 through M6.
Upshifts and downshifts are executed only
when they will result in a plausible combination
of engine and vehicle speed; thus, for example,
a downshift that would cause the engine to
overrev will not be executed by the system. If
this occurs, the selected gear appears briefly in
the instrument cluster, followed by the current
gear.
To use the automatic function again, move the
selector-lever to the right into position D.
Deactivating selector lever interlock
If the selector lever is blocked in the position P
even though the button on the selector lever is
pressed, the selector lever interlock can be
deactivated:
1.Unclip the sleeve of the selector lever.
2.Pull the sleeve up over the selector lever.
Controls
67Reference
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Mobility
One lever for all functions
1Maintaining speed, storing speed, and
accelerating
2Maintaining speed, storing speed, and
decelerating
3Interrupting cruise control
4Resuming stored speed
Maintaining speed, storing speed, and
accelerating
Press lever to resistance point, arrow 1:
The system maintains and stores the current
vehicle speed. The display1 in the speedome-
ter, see below, indicates this regulated speed.
Every time you briefly press the lever, the vehi-
cle speed increases by approx. 1 mph/1 km/h.
Press the lever to the resistance point and hold
it:
The vehicle accelerates without pressure on
the accelerator pedal. The system maintains
and stores your current speed as soon as you
release the lever.
Press the lever beyond the resistance point:
The speed increases by 5 mph/10 km/h.
The vehicle may accelerate beyond the regu-
lated speed on steep downhill stretches where
the engine's braking action alone may not be
sufficient to slow the vehicle. Speed can drop
on uphill grades if the engine output is insuffi-
cient.
Maintaining speed, storing speed, and
decelerating
Pull the lever, arrow2:
Functions are the same as1, only the vehicle
speed is reduced.
Interrupting cruise control
Press the lever up or down, arrow3.
Cruise control is also interrupted automatically:
>when you apply pressure to the brake pedal
>when you depress the clutch pedal or shift
the automatic transmission/SMG into posi-
tion N
>when DSC comes on
Resuming stored speed
Press button4:
The vehicle accelerates to and maintains the
stored speed.
Deactivating system
When the ignition is switched off, the system is
deactivated and the stored speed is deleted.
Displays in instrument cluster
1Stored desired speed
2Selected desired speed appears briefly
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 technologically
advanced 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 thorough-
Driving
68 fares. Especially on longer trips, the system can
reduce fatigue and tension, while increasing
your enjoyment of driving. Please use it safely
and responsibly.
In addition to maintaining a steady cruising
speed, active cruise control will, within the
scope of given possibilities, adjust your vehi-
cle's speed automatically if you encounter
slower vehicles ahead, thus allowing you to flow
with the traffic without having to make frequent
interventions. For example, if, while cruising 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 main-
tain your selected distance setting between
your vehicle and the vehicle ahead. You can
vary the distance, which is also speed-depen-
dent. Based on your selected distance setting,
the system automatically decreases the throttle
setting and lightly applies the brakes if neces-
sary. The vehicle brake lamps will automatically
illuminate to signal 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 transmission your vehicle is
equipped with, to maintain the distance setting
selected. If the vehicle ahead speeds up or
when the lane ahead becomes clear, your vehi-
cle will accelerate to the speed you have
selected by increasing the throttle setting and
shifting gears automatically or with the aid of
the driver as needed. Your selected speed will
be maintained when driving downhill, too.
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 differ-
ently from conventional 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 information contained in the Things to
know about active cruise control section begin-
ning on page71.<
Professional* navigation system
If there is a navigation DVD in the player, refer to
page120, then the system adapts the acceler-
ation and deceleration behavior of the vehicle to
the road on which you are currently driving.
The influence exerted by the navigation system
is canceled when the vehicle position is
unknown, e.g. when it has left the mapped
region.
Manual transmission
You can shift gears with the cruise control acti-
vated. If you drive for extended periods at very
high or very low engine speeds, then a shifting
command is issued or the system is deacti-
vated.
SMG
If you drive for extended periods at very high
engine speeds in Sequential mode, then a shift-
ing command is issued or the system is deacti-
vated.
In the Drive mode, the SMG acts similarly to an
automatic transmission in the D position.
Operating active cruise control
1Store and increase desired speed
2Store and decrease desired speed
3Deactivate system, refer to page70
4Resume stored desired speed and dis-
tance, refer to page70
5Select following distance to vehicle ahead,
refer to page69
Controls
69Reference
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Driving tips
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Mobility
Maintaining current speed
Briefly press lever, arrow1, or briefly pull,
arrow2, at a driving speed of more than approx.
20 mph or 30 km/h.
The speed currently being driven is stored and
maintained. It is indicated on the speedometer
and briefly in the instrument cluster.
The controlled speed can drop on uphill grades
if the engine output is insufficient. If the
engine's braking action is not sufficient on a
downhill grade, the system lightly brakes the
vehicle.
Setting desired speed
Adjust your desired speed to the traffic
conditions and remain ready to brake at
all times; otherwise, there is a danger of acci-
dents. The system is unable to compensate for
great differences between your speed and that
of the vehicle ahead, e.g. when quickly
approaching a truck or when another vehicle
swerves into your lane.<
Increasing in steps
Briefly press the lever repeatedly up to the
resistance point or past the resistance point,
arrow1, until the desired speed is displayed.
>Each time the lever is briefly pressed up to
the resistance point, the desired speed
increases by approx. 1 mph or 1 km/h.
>Each time the lever is briefly pressed
beyond the resistance point, the desired
speed is increased by a maximum of 5 mph
or 10 km/h until the maximum speed of
110mph or 180km/h is reached.
The speed then displayed is stored and
reached on clear roads.
Increasing without intermediate steps
Press the lever up to the resistance point or
past the resistance point, arrow1, until the
desired speed is reached.
The speed then displayed is stored and
reached on clear roads.
Decreasing without intermediate steps
Briefly pull the lever repeatedly up to the resis-
tance point or past the resistance point,
arrow2, until the desired speed is displayed.
>Each time the lever is pulled up to the resis-
tance point, the desired speed decreases
by approx. 1 mph or 1 km/h.
>Each time the lever is pulled beyond the
resistance point, the desired speed is
decreased by a maximum of 5 mph or
10 km/h until the minimum speed of
20 mph or 30 km/h is reached.
The speed then displayed is stored and
reached on clear roads.
Select distance
>Rotary switch downward:
Increase distance
>Rotary switch upward:
Decrease distance
Driving
70 The selected distance is displayed in the instru-
ment cluster.
Use good judgment to select the appro-
priate following distance given road con-
ditions, traffic, applicable laws and driving rec-
ommendations for safe following distance.<
Deactivate system
Press the lever up or down. The displays in the
instrument cluster disappear.
You also deactivate the system when you apply
the brakes, shift very slowly, or shift into neutral.
In addition, the system is deactivated automati-
cally:
>when you activate the DTC Dynamic
Traction Control
>when you deactivate the DSC Dynamic
Stability Control>when the system does not recognize any
objects for a longer time, e. g. on infre-
quently traveled roads without a shoulder or
guard rails, or if the radar sensor is covered
with dirt, refer to page71
>when the speed is reduced to below
20 mph/30 km/h due to a traffic situation
The system deactivates automatically
when the speed is set to below 20 mph/
30 km/h. A signal sounds and a message
appears in the Control Display. The active inter-
vention of the driver is required, otherwise there
is the danger of an accident.<
Resume stored desired speed and
distance
Press button 4.
The displays appear in the instrument cluster.
When you switch off the ignition, the stored
desired speed is deleted.
Displays in instrument cluster
1Stored desired speed
2Lights up yellow: vehicle driving ahead is
detected
Flashes red and a signal sounds: the system
cannot establish the distance, you must
apply the brakes
Flashes yellow: driving stability control sys-
tems intervene and the active cruise control
is deactivated
3Selected distance to vehicle driving ahead:
lights up as soon as the system is activated
4Selected desired speed appears briefly Distance 1
Distance 2
Distance 3
This distance is set when the
system is used for the first time
after starting the engine.
Distance 4
Controls
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If the display ACC --- mph/km/h briefly
appears in the instrument cluster, it might
be that conditions necessary for operation are
not currently being met. To call up Check Con-
trol messages, refer to page79.<
Warning lamps
The display2 flashes red and a sig-
nal sounds.
The system is warning you to inter-
vene by braking or executing an
evasive maneuver. The active
cruise control cannot automatically restore the
distance to the vehicle driving ahead.
This display does not, however, relieve the
driver of the responsibility for adapting desired
speed and driving style to traffic conditions.
The display2 flashes yellow.
Automatic intervention by ABS or
DSC. The active cruise control
intervenes by braking until you
actively take over.
Radar sensor
Heavy rain, dirt, snow, or ice can impair the
detection of vehicles ahead. If necessary, clean
the radar sensor under the front bumper. In
doing so, be especially careful when removing
layers of snow and ice.
If the sensor is incorrectly aligned, the active
cruise control cannot be activated.
Things to know about active cruise control
As with conventional cruise control sys-
tems, active cruise control in no way
diminishes or substitutes for the driver's own
personal responsibility, alertness and aware-
ness in adjusting speed, braking or otherwise
controlling 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 roadways where traffic is moving
relatively smoothly. Do not use this system in
city driving; heavy traffic such as during rush
hour; on curvy, winding roads, slippery roads or roads with sharp curves such as highway off-
ramps; during inclement weather such as snow,
heavy rain or fog; or when entering inter-
changes, service/parking areas or toll booths.
It is also important to regulate your vehicle's
speed and distance setting within applicable
legal limits. Always be ready to take action or
apply the brakes if necessary, especially when
the system is actively following a vehicle in front
of you.<
Always remember that the range and abil-
ity of the system do have physical limita-
tions. It will not apply the brakes or decelerate
Driving
72 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 when
approaching 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
motorcycles or bicycles. Be especially alert
when encountering any of these situations as
the system 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
alertness.<
If your vehicle is actively following a vehicle in
front of you and the vehicle ahead speeds up or
the lane ahead becomes clear, then your vehi-
cle 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.
Active cruise control can only decelerate the
vehicle to approx. 20 mph/30 km/h. If the sys-
tem reduces vehicle speed below 20 mph/
30 km/h or if DSC/ABS is engaged while driving,
the system will automatically deactivate.
Remember, the system cannot stop your
vehicle. In addition, the system is deacti-
vated whenever the driver applies the vehicle
brakes, shifts into neutral, or deactivates DSC.
After any deactivation, the system will no longer
automatically activate the vehicle brakes, which
means the driver must intervene and resume
manual braking. You should then reactivate the
system only when you are fully aware of the
prior speed and distance settings.
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.
Swerving vehicles
When a vehicle moves from an adjacent lane
into your lane, active cruise control will not rec-
ognize this vehicle until it is fully in your lane
ahead of your vehicle.
Behavior in curves
Because of the limited range of the system, it is
possible that in curves or on the peaks and val-
leys of hilly roads, a vehicle ahead may be rec-
ognized late, or not at all. Therefore, it is up to
the driver to select a speed that is prudent in
view of the curves and terrain of the roadway.
Controls
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Mobility
In approaching a curve, it is possible that active
cruise control would react briefly to a vehicle in
the adjacent lane. In addition, the system can
sense if your vehicle is in a curve and may not
accelerate. If your vehicle decelerates in either
case, you can choose to overcome the deceler-
ation by briefly pressing the accelerator pedal.
Driver interventions
Anytime the driver presses down on the
accelerator pedal, any automatic braking
action by the system is interrupted until the
pedal is fully released. After doing this, release
the accelerator and the system again controls
your cruising speed and distance setting. While
driving with the system activated, resting your
foot on the accelerator pedal will cause the sys-
tem not to brake even if necessary. Be certain
that floormats or other objects on the vehicle
floor do not interfere with movement of the
accelerator pedal.<
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.
The system cannot stop your vehicle. It uses
only a portion of braking system capacity and
does not utilize the full capacity of the vehicle
braking system. Therefore, the system cannot
decrease your speed for large differences in
speed between your vehicle and the vehicle
ahead. Examples: when you approach a vehicle
traveling at a much lower speed than your own
speed such as approaching a toll booth or when
a much slower vehicle cuts in front of you at
close range.<