Driving stability control systemsVehicle features and optionsThis 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.
Anti-lock Braking System
ABS
ABS prevents locking of the wheels during
braking.
The vehicle contains its steering power even
during full brake applications, thus increasing
active safety.
ABS is operational every time you start the en‐
gine.
Brake assistant When you apply the brakes rapidly, this system
automatically produces the greatest possible
braking force boost. It reduces the braking dis‐
tance to a minimum during emergency stop.
This system utilizes all of the benefits provided
by ABS.
Do not reduce the pressure on the brake pedal
for the duration of the emergency stop.
Adaptive brake assistant In combination with the Active Cruise Control,
this system ensures that the brakes respond
even more rapidly when braking in critical sit‐
uations.Drive-off assistant
This system supports driving off on inclines.
The parking brake is not required.1.Hold the vehicle in place with the foot
brake.2.Release the foot brake and drive off with‐
out delay.
After the foot brake is released, the vehicle is
held in place for approx. 2 seconds.
The possible holding duration amounts to
2 minutes.
Depending on the vehicle load or when a trailer
is used, the vehicle may roll back slightly.
DSC Dynamic Stability
Control
The concept DSC prevents traction loss in the power
wheels when driving off and accelerating.
DSC also recognizes unstable vehicle condi‐
tions such as fishtailing or nose-diving. Within
the physical limits DSC helps to keep the vehi‐
cle on a steady course by reducing engine
speed and by applying brakes to the individual
wheels.
Information
Adapt your driving style to the situation, for an
appropriate driving style is always the respon‐
sibility of the driver.
The laws of physics cannot be repealed, not
even with DSC.
Therefore, do not reduce the additional safety
margin by driving in a risky manner.
Seite 163Driving stability control systemsControls163
Online Edition for Part no. 0140 2 964 330 - VI/15
WARNING
When driving with roof load, e.g. with
roof-mounted luggage rack, driving safety may
not be ensured in driving-critical situations due
to the elevated center of gravity. There is risk
of accidents or risk of property damage. Do not
deactivate Dynamic Stability Control DSC
when driving with roof load.◀
Overview
Button in the vehicle
DSC OFF
Indicator/warning lights The indicator lamp flashes: DSC con‐
trols the drive and braking forces.
The indicator lamp lights up: DSC has
failed.
Deactivating/activating DSC
When DSC is deactivated, driving stability is
reduced during acceleration and when driving
in curves.
Stabilizing interventions by the Integral Active
Steering system are only performed by the
rear axle steering.
To increase vehicle stability, activate DSC
again as soon as possible.
Deactivating DSC
Hold the button down until the DSC
OFF indicator lamp is displayed in the
instrument cluster and DSC OFF is displayed.
The DSC system is switched off.
The steering and, depending on the equip‐
ment, suspension are tuned for sporty driving.
Activating DSC Press button.
DSC OFF and the DSC OFF indicator
lamp go out.
Indicator/warning lights
When DSC is deactivated, DSC OFF is dis‐
played in the instrument cluster.
The indicator lamp lights up: DSC is
deactivated.
DTC Dynamic Traction
Control
The concept The DTC system is a version of the DSC where
forward momentum is optimized.
The system ensures maximum headway on
special road conditions or loose road surfaces,
e.g., unplowed snowy roads, but with some‐
what limited driving stability.
Activating the Dynamic Traction Control DTC
provides maximum traction. Driving stability is
limited during acceleration and when driving in
curves.
Therefore drive with appropriate caution.
You may find it useful to briefly activate DTC
under the following special circumstances:▷When driving in slush or on uncleared,
snow-covered roads.Seite 164ControlsDriving stability control systems164
Online Edition for Part no. 0140 2 964 330 - VI/15
▷When freeing vehicle from deep snow or
driving off from loose grounds.▷When driving with snow chains.
Overview
Button in the vehicle
DSC OFF
Indicator/warning lights
If DTC is activated, TRACTION is displayed in
the instrument cluster.
The indicator lamp lights up: DTC Dy‐
namic Traction Control is activated.
Activating/deactivating DTC
Activating DTC Press button.
TRACTION is displayed in the instru‐
ment cluster and the indicator lamp for DSC
OFF lights up.
Deactivating DTC Press button again.
TRACTION and the DSC OFF indica‐
tor lamp go out.
xDrive
xDrive is the all-wheel-drive system of the ve‐
hicle. Concerted action by the xDrive and DSC
further optimize traction and driving dynamics.
The xDrive all-wheel-drive system variably dis‐
tributes the drive forces to the front and rear
axles as demanded by the driving situation and
road surface.
HDC Hill Descent Control
The concept
HDC is a downhill driving assistant that auto‐
matically controls vehicle speed on steep
downhill gradients. Without applying the
brakes, the vehicle moves at slightly more than
walking speed.
Hill Descent Control can be activated at
speeds below approx. 22 mph/35 km/h. When
driving downhill, the vehicle reduces its speed
to approx. walking speed and then keeps its
speed constant.
As long as there is active braking, the system
is on standby. The system does not brake the
vehicle during this time.
Only use HDC in low gears or in selector lever
position D or R.
Increasing or decreasing vehicle
speed
Specify desired speed in the range from ap‐
prox. 4 mph/6 km/h to approx. 15 mph/25 km/h
using the rocker switch of the cruise control on
the steering wheel. Vehicle speed can be
changed by lightly accelerating.Seite 165Driving stability control systemsControls165
Online Edition for Part no. 0140 2 964 330 - VI/15
▷Press the rocker switch up to the point of
resistance: the speed increases gradually.▷Press up the rocker switch past the point
of resistance: the speed increases while
the rocker switch is pressed.▷Press the rocker switch down to the point
of resistance: the speed decreases gradu‐
ally.▷Press the rocker switch down past the
point of resistance: when driving forward,
the speed decreases to approx.
6 mph/10 km/h; when reversing, the speed
decreases to approx. 4 mph/6 km/h.
Overview
Button in the vehicle
HDC
Activating HDC Press button. The LED above the buttonlights up.
Deactivating HDC
Press button again and the LED goes
out. HDC is automatically deactivated
above approx. 37 mph/60 km/h.
Display in the instrument cluster
Status display A symbol and the selected de‐
sired speed are displayed.
The desired speed is hidden af‐
ter a brief time.
With a change of the desired
speed via the rocker switch on the steering
wheel, it is displayed briefly.
Desired speedDisplay in the speedometer:▷Green marking: system is
active.▷Marking is orange/white: the
system has been paused.▷No marking: system is
switched off.
Malfunction
A message is displayed in the instrument clus‐
ter. HDC is not available, e.g., due to elevated
brake temperatures.
Integral Active Steering The concept
Integral Active Steering is a combination of Ac‐
tive Steering and rear axle steering.
The system varies the steering angle of the
wheels in relation to the steering wheel move‐
ment.
Seite 166ControlsDriving stability control systems166
Online Edition for Part no. 0140 2 964 330 - VI/15
With strong steering movements and low
speeds, e.g. when parking, the wheel angle is
magnified, that is, the steering is more direct.
The rear axle steering acts to increase maneu‐
verability by turning the rear wheels slightly in
a direction opposite to the front wheels.
At higher speeds, the rear wheels are turned in
the same direction as the front wheels.
In critical driving situations, the Integral Active
Steering can stabilize the vehicle through pur‐
poseful steering of the rear wheels before the
driver intervenes, e.g. in case of oversteering.
General information The system offers several different tunings.
These are assigned to the different driving
modes of the Driving Dynamics Control, refer
to page 110.
TuningDrive modeIntegral Active SteeringCOMFORT/E
CO PROcomfortable, for optimal
travel comfortSPORTdynamic, for greater agility
Using snow chains
Information When snow chains are in use, refer to
page 264, rear wheel steering is deactivated.
Malfunction
In the event of a malfunction, the steering
wheel must be turned further, while the vehicle
responds more sensitively to steering wheel
movements in the higher speed range.
The stability-enhancing intervention may be
deactivated.
Proceed cautiously and drive defensively.
Have the system checked.
Seite 167Driving stability control systemsControls167
Online Edition for Part no. 0140 2 964 330 - VI/15
Driver assistance systemsVehicle 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.
Active Cruise Control with Stop & Go function, ACC
The concept
Use this system to select a desired speed that
the vehicle will maintain automatically on clear
roads.
To the extent possible, the system automati‐
cally adjusts the speed to a slower vehicle
ahead of you.
The distance that the vehicle maintains to the
vehicle ahead of you can be varied. For safety
reasons, it depends on the speed.
To maintain a certain distance, the system au‐
tomatically reduces the speed, applies the
brakes lightly, or accelerates again if the vehi‐
cle ahead begins moving faster.
If the vehicle ahead of you brakes to a halt, and
then proceeds to drive again within a brief pe‐
riod, the system is able to detect this within the
given system limits. Your own vehicle will
brake automatically and then accelerate again.
If the vehicle ahead of you drives away again
after a prolonged period, briefly press the ac‐
celerator pedal or press the appropriate button
to reactivate the system. The vehicle will auto‐
matically accelerate.As soon as the road is clear, the vehicle accel‐
erates to the desired speed.
Vehicles driving ahead are captured by a radar
sensor and a camera.
General information
Depending on the driving settings, the features
of the cruise control can change in certain
areas.
The desired speed is also maintained downhill,
but may not be maintained on uphill grades if
engine power is insufficient.
Due to the driving style that minimizes fuel
consumption in ECO PRO drive mode, the ve‐
hicle may drop below the set desired speed in
some situations, e.g. on uphill grades.
Information WARNING
The system does not relieve from the
personal responsibility to correctly assess the
traffic situation. Based on the limits of the sys‐
tem, it cannot independently react to all traffic
situations. There is risk of an accident. Adjust
the driving style to the traffic conditions. Watch
traffic closely and actively interfere in the re‐
spective situations.◀
WARNING
An unsecured vehicle can put itself into
motion and roll away. There is risk of an acci‐
dent. Before exiting, secure the vehicle against
rolling.
In order to ensure that the vehicle is secured
against rolling away, observe the following:▷Set the parking brake.▷On uphill grades or on a slope, turn the
front wheels in the direction of the curb.▷On uphill grades or on a slope, also secure
the vehicle, e.g. with a wheel chock.◀Seite 168ControlsDriver assistance systems168
Online Edition for Part no. 0140 2 964 330 - VI/15
Overview
Buttons on the steering wheelPress
buttonFunctionCruise control on/off, refer to
page 169.Store/maintain speed, refer to
page 170.Pause cruise control, refer to
page 170.
Continue cruise control with the
last setting, refer to page 171.Without steering and lane guid‐
ance assistant:
Increase distance, refer to
page 171.Without steering and lane guid‐
ance assistant:
Reduce distance, refer to
page 171.With steering and lane guidance
assistant:
Adjust distance, refer to
page 171.Rocker switch:
Maintain, store, change speed,
refer to page 170.With steering and lane guidance
assistant:
Steering and lane guidance as‐
sistant including Traffic Jam As‐
sist on/off, refer to page 177.Radar sensor
The radar sensor is located in the front
bumper.
Always keep radar sensor clean and unob‐
structed.
Camera
The camera is installed near the interior rear‐
view mirror.
Keep the windshield in the area behind the in‐
terior rearview mirror clean and clear.
Switching on/off and interrupting
cruise control
Switching on Press button on the steering wheel.
The indicator lights in the instrument cluster
light up and the mark in the speedometer is set
to the current speed.
Cruise control is active.
DSC Dynamic Stability Control will be
switched on if needed.
Seite 169Driver assistance systemsControls169
Online Edition for Part no. 0140 2 964 330 - VI/15
Switch off
To switch off the system while standing, step
on brake pedal at the same time.
Press button on the steering wheel.
The displays go out. The stored desired speed
is deleted.
Interrupting When active, press the button on the
steering wheel.
If interrupting the system while stationary,
press on the brake pedal at the same time.
The system is automatically interrupted in the
following situations:▷When the brakes are applied.▷When selector lever position D is disen‐
gaged.▷When DTC Dynamic Traction Control is
activated or DSC is deactivated.▷When DSC is actively controlling stability.▷If the safety belt and the driver's door are
opened while the vehicle is standing still.▷If the system has not detected objects for
an extended period, e.g., on a road with
very little traffic without curb or shoulder
markings.▷If the detection range of the radar is dis‐
rupted, e.g., by dirt or heavy fog.▷After a longer stationary period when the
vehicle has been braked to a stop by the
system.
Maintaining, storing, and changing the
speed
Information WARNING
The desired speed can be incorrectly ad‐
justed or called up by mistake. There is risk of
an accident. Adjust the desired speed to the
traffic conditions. Watch traffic closely and ac‐
tively interfere in the respective situations.◀
WARNING
Risk of accident due to too high speed
differences to other vehicles, e.g. in the follow‐
ing situations:▷When fast approaching a slowly moving
vehicle.▷Suddenly swerving vehicle onto the own
lane.▷When fast approaching standing vehicles.
There is risk of injuries or danger to life. Watch
traffic closely and actively interfere in the re‐
spective situations.◀
Maintaining/storing the speed Press button.
Or:
Press the rocker switch while the system is in‐
terrupted.
When the system is switched on, the current
speed is maintained and stored as the desired
speed.
This is displayed in the speedometer and
briefly in the instrument cluster, refer to
page 172.
DSC Dynamic Stability Control will be
switched on if needed.
Seite 170ControlsDriver assistance systems170
Online Edition for Part no. 0140 2 964 330 - VI/15