Driving comfortVehicle equipment
All standard, country-specific and optional
equipment that is offered in the model series is
described in this chapter. Therefore, equip‐
ment is also described that is not available in a
vehicle, e. g., because of the selected optional
equipment or country variant. This also applies
for safety-related functions and systems.
Active Cruise Control with Stop & Go function, ACC
The conceptThis system can be used to select a desired
speed that the vehicle will maintain automati‐
cally 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, the
system is able to detect this within the given
system limits. If the vehicle ahead of your
drives away again from a halt, your vehicle is
able to accelerate if operated accordingly.
Even if some time passes before the vehicle
ahead of you drives away again, your own vehi‐
cle can still be accelerated automatically and
simply.
As soon as the road is clear, it accelerates to
the desired speed.The speed is also maintained on downhill gra‐
dients, but may not be maintained on uphill
slopes if engine power is insufficient.
General information
Depending on the set driving program, the
characteristics of the cruise control can
change in certain areas.
Hints Personal responsibility
Even an active system does not release
the driver from personal responsibility for the
driving process, especially for lane tracking,
adaptation of speed, distance and driving style
to the traffic conditions.
Because of technical system limits, the system
cannot independently react appropriately in all
traffic situations.
Monitor the driving process, the surrounding
area and what is occurring in traffic continu‐
ously and attentively and actively intervene as
required, e.g., by braking, steering or making an evasive maneuver.◀
Unfavorable weather conditions
In the event of unfavorable weather and
light conditions, e. g. if there is rain, snowfall,
slush, fog or glare, this may result in poorer
recognition of vehicles and lane limits as well
as short-term interruptions for vehicles that are
already detected. Drive attentively, and react to
the current traffic events. Intervene actively
when necessary, e.g., by braking, steering or
making an evasive maneuver, otherwise, there
is danger of an accident.◀Seite 138ControlsDriving comfort138
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At a glance
Buttons on the steering wheelPress the
buttonFunctionCruise control on/off, interrupt‐
ing, refer to page 139Store/maintain speed, refer to
page 140Resume speed, refer to
page 141Reduce distance, refer to
page 141Increase distance, refer to
page 141With Congestion Assistant: Ad‐
just distance, refer to page 141Rocker switch:
Change/maintain speed, refer to
page 140Congestion assistant: Conges‐
tion assistant on/off, interrupt‐
ing, refer to page 145
The arrangement of the buttons varies accord‐
ing to the how the vehicle is equipped or coun‐
try-specific variants.
Radar sensor
A radar sensor is located in the front bumper
for detecting vehicles on the road ahead of the
vehicle.
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.
Camera
The camera is located near the base of the
mirror.
Keep the windshield in the area behind the in‐
terior rearview mirror clean and clear.
A dirty or covered area in front of the interior
mirror may hinder the detection of vehicles.
▷If necessary, clean the area in front of the
interior mirror, e.g., carefully remove salt
residue in the winter.
Switching on/off and interrupting cruise control
Switching on Press the button on the steering
wheel.
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The indicator lamps in the instrument cluster
light up and the mark in the speedometer is set
to the current speed.
Cruise control can be used.
Switching off Deactivated or interrupted system
If the system is deactivated or inter‐
rupted, actively intervene by braking, steering
and, if necessary, with evasive maneuvers; oth‐
erwise, there is the danger of an accident oc‐
curring.◀
If switching off the system while stationary,
press on the brake pedal at the same time.
Press the button on the steering
wheel.▷If active: press twice.▷If interrupted: press once.
The displays go out. The stored desired speed
and distance are deleted.
Interrupting 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 transmission position D is disen‐
gaged.▷When DTC Dynamic Traction Control is
activated or DSC is deactivated.▷When DSC is actively controlling stability.▷When SPORT+ is activated with Driving
Dynamics Control.▷If the safety belt and the driver's door are
opened when the vehicle is standing still.▷If the system has not detected objects for
an extended period, e.g., on a road withvery little traffic without road edge line
markings.▷If the detection range of the radar is dis‐
rupted, for example, by dirt or heavy fog.
Maintaining/storing the speed
Press the 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. Displays in the
instrument cluster, refer to page 142.
When cruise control is maintained or stored,
DSC Dynamic Stability Control is switched on,
if necessary.
Changing, maintaining, and storing
the speed
The rocker switch can be pressed while the
system is interrupted to maintain and store the
current speed. DSC Dynamic Stability Control
is switched on, if necessary.
Adapting the desired speed
Adapt the desired speed to the road con‐
ditions and be ready to brake at all times; oth‐
erwise, there is the danger of an accident oc‐
curring.◀
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The system was deactivated but applies the
brakes until you actively resume control by
pressing on the brake pedal or accelerator
pedal.
The vehicle symbol flashes red and an
acoustic signal sounds:
You are requested to intervene by
braking or making an evasive maneuver.
Displays in the Head-up Display The information from Active Cruise Control
can also be displayed in the Head-up Display.
Adjusting the Head-up Display, refer to
page 97.
System limits
Speed range
Best results are achieved when using the sys‐
tem on well-developed roads and highways.
The system is functional at speeds beginning
at approx. 20 mph/30 km/h.
The maximum speed that can be set depends
on the vehicle.
The system can also be activated when sta‐
tionary.
Comply with the legal speed limit in every sit‐
uation when using the system.
Detection range
The detection capacity of the system and the
automatic braking capacity are limited.
Two-wheeled vehicles for instance might not
be detected.
Limited detection capacity
Because of the limits to the detection ca‐
pacity of the camera and the sensor, you
should be alert at all times so that you can in‐
tervene actively, if necessary; otherwise, there
is the danger of an accident occurring.◀
Deceleration
The system does not decelerate for:▷Pedestrians or similar slow-moving road
users.▷Red traffic lights.▷Cross traffic.▷Oncoming traffic.
Swerving vehicles
A vehicle driving in front of you is not detected
until it is completely within the same lane as
your vehicle.
Swerving vehicles
If a vehicle driving ahead of you suddenly
swerves into your lane, the system may not be
able to automatically restore the selected dis‐
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. You must react yourself;
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Displays in the instrument clusterSymbolDescriptionCongestion Assistant and Distance
Control on standby.Congestion Assistant on standby.
Distance control controls within the
set distance.Congestion Assistant activated.
The system controls the speed and
assists with maintaining the lane.Rolling bars: speed is no longer in‐
creased by the congestion assistant
at 25 mph/40 km/h. When the
speed is increased by the driver, the
system does not perform any more
steering movements.Red flashing and signal tone: con‐
gestion Assistant is interrupted.
The system does not carry out a
steering movement. ACC exercises
control.
System limits
When driving within narrow driving lanes, e.g.,
in construction zones or rescue lanes, the sys‐
tem cannot be activated or meaningfully used.
Limited detection capacity
Because of the limits to the detection ca‐
pacity of the camera and the sensor, you
should be alert at all times so that you can in‐
tervene actively, if necessary; otherwise, there
is the danger of an accident occurring.◀
Complying with country-specific laws
When the Congestion Assistant is used,
observe specific national laws.◀
Cruise control
The concept The system is functional at speeds beginning
at approx. 20 mph/30 km/h.
It maintains the speed that was set using the
control elements on the steering wheel.
The system brakes on downhill gradients if en‐
gine braking action is insufficient.
Unfavorable conditions
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.◀
General information
Depending on the set driving program, the
characteristics of the cruise control can
change in certain areas.
Controls
At a glance
Press the
buttonFunctionCruise control on/off, interrupt‐
ing, refer to page 149Store/maintain speed, refer to
page 149Resume speed, refer to
page 150Rocker switch:
Change/maintain speed, refer
to page 149Seite 148ControlsDriving comfort148
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The arrangement of the buttons varies accord‐
ing to the how the vehicle is equipped or coun‐
try-specific variants.
Switching on Press the button on the steering
wheel.
The marking in the speedometer is set to the
current speed.
The cruise control can be used.
Switching off Deactivated or interrupted system
If the system is deactivated or inter‐
rupted, actively intervene by braking and, if
necessary, with evasive maneuvers; otherwise,
there is the danger of an accident occurring.◀
Press the button on the steering
wheel.▷If active: press twice.▷If interrupted: press once.
The displays go out. The stored desired speed
is deleted.
Interrupting When active, press the button.
The system is automatically interrupted if:
▷The brakes are applied.▷The transmission position D is disengaged.▷DTC Dynamic Traction Control is activated
or DSC is deactivated.▷DSC is actively controlling stability.▷HDC is activated.▷When SPORT+ is activated with Driving
Dynamics Control.
Maintaining/storing the current speed
Press the 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.
It is displayed in the speedometer and briefly
displayed in the instrument cluster, Displays in
the speedometer, refer to page 150.
When cruise control is maintained or stored,
DSC Dynamic Stability Control is switched on,
if necessary.
Changing/maintaining speed The rocker switch can be pressed while the
system is interrupted in order to maintain and
store the current speed.
Adapting the desired speed
Adapt the desired speed to the road con‐
ditions and be ready to brake at all times; oth‐
erwise, there is the danger of an accident oc‐
curring.◀
Press the rocker switch up or down repeatedly
until the desired speed is set.
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Malfunction
A Check Control message is displayed.
The parking assistant failed. Have the system
checked.
Distance information The conceptThe system displays a symbol in the Head-up
Display to indicate that the distance behind the
vehicle in front is not sufficient.
General information
The distance is determined by the radar sen‐
sor of the Active Cruise Control.
Hints Personal responsibility
The display does not relieve the driver of
the responsibility to adapt his or her distance
and driving style to the traffic conditions. Main‐
tain the prescribed safety distance.◀
At a glance
Radar sensor
A radar sensor is located in the front bumper
for detecting vehicles on the road ahead of the
vehicle.
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.
Switching on
1.Switching on Head-Up Display, refer to
page 97.2."Distance info": Select the indication in the
Head-Up Display, refer to page 97.
Display in the Head-up Display
The symbol is displayed when the dis‐
tance from the vehicle traveling ahead
is too short.
Functional requirements
▷Active Cruise Control switched off.▷Display in the Head-up Display selected.▷Distance too short.▷Speed greater than approx.
40 mph/70 km/h.
Malfunction
The system cannot be activated if the radar
sensor is not aligned correctly. This may be
caused by damage incurred during parking, for
example.
A Check Control message is displayed if the
system fails.
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SymbolMeasureFor efficient driving style, back off
the accelerator or delay accelerating
to allow time to assess road condi‐
tions.Reduce speed to the selected ECO
PRO speed.Automatic transmission: switch
from M/S to D and avoid manual
shift interventions.
Indications on the Control Display
EfficientDynamics Information on fuel consumption and technol‐
ogy can be displayed during driving.
1."Vehicle Info"2."EfficientDynamics"
Displaying EfficientDynamics info
The current efficiency can be displayed.
"EfficientDynamics info"
The following systems are displayed:
▷Automatic engine start-stop function.▷Energy recovery.▷Climate control output.▷Coasting.
Display ECO PRO tips
"ECO PRO Tips"
The setting is stored for the profile currently in
use.
Coasting
The concept
The system helps to conserve fuel.
To do this, under certain conditions the engine
is automatically decoupled from the transmis‐
sion when transmission position D is engaged.
The vehicle continues traveling with the engine
idling to reduce fuel consumption. Transmis‐
sion position D remains engaged.
This driving condition is referred to as coast‐
ing.
As soon as the brake or accelerator pedal is
depressed, the engine is automatically coupled
to the transmission again.
Hints Coasting is a component of the ECO PRO, re‐
fer to page 198, driving mode.
Coasting is automatically activated when ECO
PRO mode is called via the Driving Dynamics
Control.
The function is available in a certain speed
range.
A forward-looking driving style helps the driver
to use the function as often as possible and supports the fuel-conserving effect of coast‐
ing.
Safety mode
The function is not available if one of the fol‐ lowing conditions is satisfied.▷DSC OFF or TRACTION activated.▷Driving in the dynamic limit range and on
steep uphill or downhill grades.▷Battery charge status temporarily too low
or vehicle electrical system drawing exces‐
sive current.▷Cruise control activated.
Functional requirements
In ECO PRO mode, this function is available in
a speed range from approximately 30 mph, ap‐
prox. 50 km/h to 100 mph, approx. 160 km/h, if
the following conditions are satisfied:
▷Accelerator pedal and brake pedal are not
operated.Seite 200Driving tipsSaving fuel200
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