The system stores the current vehicle speed. It
is indicated on the speedometer and briefly in
the instrument panel.
Increasing desired speed
Press or briefly push the lever up to or beyond
the resistance point, arrow 1, until the desired
speed is displayed.
The displayed speed is stored and the vehicle
reaches the stored speed if the road is clear.
▷With each activation to the resistance
point, the desired speed increases by ap‐
prox. 1 mph/1 km/h.▷With each activation beyond the resistance
point, the desired speed increases by a
maximum of 5 mph/10 km/h.
Reducing the desired speed
Pull the lever, arrow 2, until the desired speed
is displayed.
The functions are the same as those when in‐
creasing the desired speed.
Selecting the distance
▷Press the rocker down briefly:Increase the distance.▷Press the rocker up briefly:
Decrease the distance.
The selected distance is displayed in the in‐
strument panel.
Distance displayDistance 1, closestDistance 2Distance 3Distance 4, furthest
This distance is set when you
activate the system.
Selecting an appropriate distance
Use good judgement to select the appro‐
priate following distance given road conditions,
traffic, applicable laws and State driving rec‐
ommendations for safe following distance.
Otherwise, a violation of the law or risk of an
accident could result.◀
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Interrupting the system
Press the lever up or down and additionally de‐
press the brake if the vehicle is stationary. The
mark in the speedometer changes color and
the distance indicator goes out.
In addition, the system is interrupted:
▷When the brakes are applied.▷When the transmission position D is disen‐
gaged.▷When DTC is activated or DSC is deacti‐
vated.▷When DSC is activated▷When the safety belt and the driver's door
are opened while the vehicle is stationary.▷When the system has not detected objects
for an extended period, e.g., on a road with
very little traffic without road edge line
markings.▷The radar sensor is dirty.
Active intervention if the system is inter‐
rupted
If the system is interrupted, actively intervene
by braking and, if necessary, with evasive ma‐
neuvers; otherwise, there is the danger of an
accident occurring.◀
Calling up the stored desired speed
and distance
While driving
Press button 4, refer to page 112. All of the
displays in the instrument panel lights up.
While standing
Before leaving the vehicle
Before leaving the vehicle with the en‐
gine running, engage position P of the auto‐
matic transmission and apply the parking
brake. Otherwise, the vehicle may begin to
roll.◀
If a vehicle detected ahead of you slows to a
halt and your vehicle is also brought to a halt
by the system:▷If the vehicle ahead of you drives away,
your vehicle accelerates automatically as
long as mark 1 for the desired speed in the
speedometer is green.▷If the vehicle ahead of you drives away
when mark 1 is orange, depress the accel‐
erator briefly or press button 4.Rolling bars
in the distance indicator 3 mean that the
vehicle ahead of you has driven away.
If you are standing behind a vehicle with your
brake pedal depressed and the system is de‐
activated or interrupted:
1.Select the desired speed using the lever,
arrow 1 or arrow 2, or press button 4 to re‐
trieve a stored speed.2.Release the brake pedal.3.When the vehicle ahead of you drives
away, press on the accelerator briefly or
press button 4.
Deactivating the system
▷When driving, press the lever up or down
twice.▷When stationary, do the same while de‐
pressing the brake pedal.▷Switch off the ignition.
The displays go out, and the stored desired
speed and distance are deleted.
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Displays in instrument cluster1Stored 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 in‐
dicator lights up as soon as the system is
activated.
The indicator lights up as soon as the sys‐
tem is activated.
The bars roll: the vehicle in front of you has
driven off4Brief display of stored desired speed
If the display --- mph/---km/h appears briefly,
the conditions necessary for operation may
currently not be met.
Warning lamps Display 2 flashes red and a signal
sounds.
The system requests that the you
intervene by braking and carrying
out evasive maneuvers, if necessary. The sys‐
tem cannot independently restore the distance
to the vehicle ahead.
This display does not relieve the driver of the
responsibility to adapt his or her desired driv‐
ing speed and style to the traffic conditions.
Display 2 flashes yellow.
The conditions necessary for op‐
eration of the system are no lon‐
ger met, e.g., due to ABS or DSC
intervention. The system applies the brakes
until you actively assume control.
Radar sensor
Position
The radar sensor is integrated in the bumper.
Dirty or covered sensor
A dirty or covered sensor may hinder the de‐
tection of vehicles.
▷If necessary, clean the radar sensor. Re‐
move layers of snow and ice carefully.▷Do not cover the view field of the radar
sensor.
Malfunction
The system cannot be activated if the radar
sensor is not aligned correctly. Misalignment
may be caused by damage incurred during
parking, for example.
For US owners only
The transmitter and receiver units comply with
part 15 of the FCC/Federal Communication
Commission regulations. Operation is gov‐
erned by the following:
FCC ID:
▷OAYARS3-ASeite 115Driving comfortControls115
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tance. This also applies to major speed differ‐
ences to vehicles driving ahead of you, e.g.,
when rapidly approaching a truck. When a ve‐
hicle driving ahead of you is reliably detected,
the system requests that the driver intervene
by braking and carrying out evasive maneu‐
vers, if necessary. Take action yourself, other‐
wise there is a risk of an accident.◀
Unexpected lane change
If a vehicle ahead of you unexpectedly moves
into another lane from behind a stopped vehi‐
cle, you yourself must react, as the system
does not react to stopped vehicles.
Cornering
If the desired speed is too high for a curve, the
speed is reduced slightly in the curve, although
curves cannot be anticipated in advance.
Therefore, drive into a curve at an appropriate
speed.
In tight curves, situations may result due to the
restricted detection range of the system in
which a vehicle driving ahead of you may not
be detected at all, or not until after a consider‐
able delay.
When approaching a curve, the system may
react briefly to the vehicles in the next lane due
to the bend of the curve. Any deceleration of
the vehicle by the system can be compensated
for by briefly accelerating. After the accelerator
pedal is released, the system becomes active
again and independently controls the speed.
Driving away In some situations, the vehicle cannot drive
away automatically, e.g., on steep inclines, with
a heavy trailer or behind bumps in the road.
Driver interventions and your
responsibility
Your actions have priority at all times. When
you press on the accelerator pedal while driv‐
ing, automatic braking is not performed and
the bars in the distance display go out until you
lift your foot from the accelerator pedal. Once
you release the accelerator pedal, the desired
speed is achieved again on clear roads or the
selected distance to the vehicle ahead is main‐
tained.
Making braking possible
Anytime the driver presses down on the
accelerator pedal, any braking action by the
system is interrupted and the distance indica‐
tor goes out until the pedal is fully released. As
soon as you fully release the accelerator, the
system will again control your cruising speed
and distance setting. While driving with the
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system activated, resting your foot on the acel‐
erator pedal will cause the system not to brake
even if necessary. Be certain that floormats or
other objects on the vehicle floor do not inter‐
fere with movement of the acccelerator
pedal.◀
Limits of automatic braking
While active cruise control is capable of
braking your vehicle automatically when you
approach a slower vehicle ahead, it is impor‐
tant to be aware that the ability of the system
to apply the brakes is also limited, e.g. when
you reduce your desired speed sharply. lt 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.◀
Cruise controlThe concept The system is functional at speeds beginning
at approx. 20 mph/30 km/h.
The speed specified using the lever on the
steering column is maintained.
The system brakes on downhill gradients if en‐
gine braking action is insufficient.
Do not use cruise control
Do not use the system if unfavorable
conditions make it impossible to drive at a con‐
stant speed, for instance:▷On curvy roads.▷In heavy traffic.▷On slippery roads, in fog, snow or rain, or
on a loose road surface.Otherwise, you could lose control of the vehi‐
cle and cause an accident.◀
One lever for all functions1Storing and maintaining speed or acceler‐
ating2Storing and maintaining speed or deceler‐
ating3Interrupting and deactivating the system4Resuming a speed stored beforehand
Maintaining current speed
Push, arrow 1, or pull, arrow 2, the lever to the
resistance point.
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 ef‐
fect 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, arrow 1, until the desired
speed is reached.
▷Each time the lever is pressed to the point
of resistance, the desired speed increases
by approx. 1 mph/1 km/h.▷Each time the lever is pressed beyond the
resistance point, the desired speed is in‐
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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 resist‐
ance point, the desired speed is decreased
by approx. 1 mph/1 km/h.▷Each time the lever is pulled beyond the
resistance point, the desired speed is re‐
duced by up to 5 mph/10 km/h until the
minimum speed of 20 mph/30 km/h is ach‐
ieved.
The system stores and maintains the speed.
Interrupting the system
Press the lever up or down, arrow 3: dis‐
play 1 in the speedometer changes color, refer
to page 119.
In addition, the system is interrupted:
▷When the brakes are applied.▷When the transmission position D is disen‐
gaged.▷When DTC is activated or DSC is deacti‐
vated.▷When DSC or ABS is intervening.
Warning lamp
The warning lamp lights up if cruise
control has been deactivated auto‐
matically, e.g., by a control intervention of the
DSC. A message appears on the Control Dis‐
play.
Resuming cruising speed
Press button 4:
The stored speed is resumed and maintained.
Deactivating the system▷Press the lever upward or downward twice,
arrow 3.▷Switch off the ignition.
The stored speed is cleared.
Displays in the instrument cluster
1Stored desired speed▷Green: the system is active.▷Orange: the system is interrupted.2Selected desired speed appears briefly
If the display --- mph or --- km/h appears
briefly, conditions may not be adequate to op‐
erate the system.
Call up Check Control messages, refer to
page 86.
Malfunction The warning lamp lights up. The sys‐
tem is malfunctioning or has failed.
A message appears on the Control
Display. More information, refer to page 85.
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Park Distance Control PDCThe concept
In addition to the PDC Park Distance Control,
the backup camera, refer to page 122, can be
switched on.
PDC supports you when parking. A slow ap‐
proach to an object in front of or behind your
vehicle is announced by:▷Signal tones.▷Visual display.
Measurement
Measurements are made by ultrasound sen‐
sors in the bumpers.
The range is approx. 6 ft/2 m.
An acoustic warning is first given:
▷By the front sensors and two rear corner
sensors at approx. 24 in/60 cm.▷By the rear middle sensors at approx.
5 ft/1.50 m.
System limits
Check the traffic situation as well
PDC cannot serve as a substitute for the
driver's personal judgment of the traffic situa‐
tion. Check the traffic situation around the ve‐
hicle with your own eyes. Otherwise, an acci‐
dent could result from road users or objects
located outside of the PDC detection range.
Loud noises from outside and inside the vehi‐
cle may prevent you from hearing the PDC's
signal tone.◀
Avoid driving quickly with PDC
Avoid approaching an object quickly.
Avoid driving away quickly while PDC is not yet
active.
For technical reasons, the system may other‐
wise be too late in issuing a warning.◀
Limits of ultrasonic measurement
The detection of objects can reach the physi‐
cal limits of ultrasonic measurement, for in‐
stance:▷With tow bars and trailer hitches.▷With thin or wedge-shaped objects.▷With low objects.▷With objects with corners and sharp edges.
Low objects already displayed, e.g., curbs, can
move into the blind area of the sensors before
or after a continuous tone sounds.
High, protruding objects such as ledges may
not be detected.
False warnings
PDC may issue a warning under the following
conditions even though there is no obstacle
within the detection range:
▷In heavy rain.▷When sensors are very dirty or covered in
ice.▷When sensors are covered in snow.▷On rough road surfaces.▷In large buildings with right angles and
smooth walls, e.g., in underground ga‐
rages.▷In heavy exhaust.▷Due to other ultrasound sources, e.g.,
sweeping machines, high pressure steam
cleaners or neon lights.
Switching on automatically
With the engine running or the ignition
switched on, shift the selector lever into posi‐
tion R.
Switching off automatically when
driving forward
The system switches off when a certain dis‐
tance or speed is exceeded.
Switch on the system again if necessary.
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Switching on/off manually
Press the button.
▷On: the LED lights up.▷Off: the LED goes out.
Signal tonesWhen approaching an object, an intermittent
tone is sounded that indicates the position of
the object. For example, if an object is de‐
tected behind the vehicle, a signal tone sounds
from the rear speakers.
The shorter the distance to the object be‐
comes, the shorter the intervals.
If the distance to a detected object is less than
approx. 12 in/30 cm, a continuous tone is
sounded.
If objects are located both in front of and be‐
hind the vehicle, an alternating continuous sig‐
nal is sounded.
The intermittent tone is interrupted after ap‐
prox. 3 seconds:
▷If the vehicle stops in front of an object that
is detected by only one of the corner sen‐
sors.▷If moving parallel to a wall.
The signal tone is switched off:
▷When the vehicle moves away from an ob‐
ject by more than approx. 4 in/10 cm.▷When transmission position P is engaged.
Volume
You can set the volume of the PDC signal tone,
refer to page 191.
The setting is stored for the remote control
currently in use.
Visual warning
The approach to an object can be shown on
the Control Display. Objects that are farther
away are displayed on the Control Display be‐
fore a signal tone sounds.
The display appears as soon as PDC is acti‐
vated.
If the last image selected was the rear view
camera, this is displayed again. To switch to
PDC:
"Switch off rear view camera"
The setting is stored for the remote control
currently in use.
Image on the Control Display
Switching on the rear view camera
using iDrive
With PDC activated:
"Rear view camera"
The image of the rear view camera is dis‐
played. The setting is stored for the remote
control currently in use.
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