The sensor is part of the ACC» page 110 and Front Assist » page 114systems.
The sensor function may be impaired in the events of one of the following. ▶ The sensor cover is soiled (e.g. with mud, snow etc.).
▶ The area in front of and around the sensor cover is obscured (e.g. by labels,
auxiliary headlights etc.).
▶ When visibility is poor, (e.g. fog, heavy rain, thick snowfall).
If the sensor is covered or dirty, the corresponding message appears in the in-
strument cluster display for the ACC system » page 114, Malfunctions or Front
Assist system » page 116, Malfunctions .WARNING■
If you suspect that the sensor is damaged, deactivate the ACC system and
Front Assist system » page 111, » page 116 . Have the sensor checked by a
specialist garage.■
A collision or damage in the front or lower area of the vehicle could affect
the sensor function - there is risk of accident! Have the sensor checked by
a specialist garage.
■
Do not cover the area in front of and around the sensor cover. This can
lead to impaired function of the sensor - risk of accidents!
CAUTION
Remove the snow with a brush and the ice with a solvent-free de-icer.
Braking and stabilisation systems
Introduction
This chapter contains information on the following subjects:
Stability Control (ESC)
101
Anti-lock braking system (ABS)
101
Engine drag torque control (MSR)
101
Traction control (TCS)
102
Electronic differential lock (EDL and XDS)
102
Brake Assist (HBA)
102
Hill Start Assist (HHC)
102
Multi collision brake (MCB)
103
The brake and stabilization systems are automatically activated each time the
ignition is switched on, unless otherwise indicated.
The error display is in Chapter » page 28, Warning lights .WARNINGThe general information relating to the use of assistance systems must be
observed » page 100, in section Introduction .
Stability Control (ESC)
Read and observe
on page 101 first.
The ESC improves vehicle stability when driving at the limit (e.g. if the vehiclestarts to skid) by braking individual wheels to maintain the desired direction.
If there is a TCS intervention, the indicator light flashes in the instrument
cluster.
Anti-lock braking system (ABS)
Read and observe
on page 101 first.
ABS prevents the wheels locking when braking. Thereby, it helps the driver to
maintain control of the vehicle.
The intervention of the ABS is noticeable from the pulsating movements of
the brake pedal which is accompanied by noises.
When the ABS system is active, do not pump the brakes or lift off the brake
pedal.
Engine drag torque control (MSR)
Read and observe
on page 101 first.
MSR counteracts the tendency of the drive wheels to lock during downshifts
or sudden deceleration (e.g. on icy or an otherwise slippery road surface).
If the drive wheels should lock, then the engine speed is automatically in-
creased. This reduces the braking effect of the engine and the wheels can ro-
tate freely again.
101Assist systems
Traction control (TCS)Fig. 126
Key for the TCS system
Read and observe on page 101 first.
TCS prevents the spinning of the wheels of the driven axle. TCS reduces thedrive power transmitted to the wheels in the case of slipping wheels. Thereby,
for example, driving on road surfaces with low grip is made easier.
During a TCS intervention, the indicator light flashes in the instrument clus-
ter.
The deactivation/activation of TCS can be carried out, depending on equip-
ment, in one of the following ways. ▶ Infotainment » Owner's Manual Infotainment .
▶ By pressing the
» Fig. 126 button.
During deactivation the warning light lights up in the instrument cluster
and
an appropriate message is displayed in the instrument cluster.
During activation extinguished the warning light
is and an appropriate mes-
sage is displayed in the instrument cluster.
The TCS should normally always be enabled. The system should be deactivated
only in the following situations, for example.
▶ When driving with snow chains.
▶ When driving in deep snow or on a very loose surface.
▶ When “rocking a car free” when it has become stuck.
Electronic differential lock (EDL and XDS)
Read and observe
on page 101 first.
EDL prevents the turning of the respective wheel of the driven axle. EDL
brakes a spinning wheel if required and transfers the drive power force to the
other drive wheel. Driving becomes easier on road surfaces with different trac-
tion under each wheel of the driven axle.
EDL switches off automatically to avoid excessive heat generation on the
brake of the wheel being braked. Once the brakes have cooled down, there is
an automatic re-activation of EDL.
XDS is an extension to the electronic differential lock (EDL). XDS does not re-
spond to the relieved inner curve wheel of the driven axle in the case of fast
cornering.
By applying braking force to the relieved wheel, spinning is prevented by the
XDS. This has a positive effect on the driving stability and steerability of the
vehicle.
Brake Assist (HBA)
Read and observe
on page 101 first.
HBA increases the braking effect and helps to shorten the braking distance.The HBA is activated by very rapid depression of the brake pedal. To achieve
the shortest possible braking distance, the brake pedal must be applied firmly
until the vehicle has come to a complete standstill.
HBA is automatically switched off when the brake pedal is released.
Hill Start Assist (HHC)
Read and observe
on page 101 first.
When moving off on a gradient, HHC allows you to move your foot from thebrake pedal to the accelerator pedal without the vehicle rolling downhill.
The vehicle is braked by the system for about 2 seconds after releasing the
brake pedal.
The HHC is active on gradients upwards of 5 % if the driver door is closed. HHC
is always only active on slopes pulling away forwards or in reverse.
102Driving
Distance of the orientation lines behind the vehicle » Fig. 133
The distance is about 40 cm (safety distance limit).
The distance is about 100 cm.
The distance is about 200 cm.
The distance may vary slightly depending on the load of the vehicle and the
road inclination.
The distance between the side lines corresponds approximately to the vehicle
width including mirrors.
Functional surfaces » Fig. 133
Depending on the Infotainment Type: Turns the display of the area be-
hind the vehicle off
Display settings - brightness, contrast, colour Switching audible parking signals on/off
Enabling and reduced park assistance display
Change to park assistance display
CAUTION
The objects shown in the display can be closer or even further away than they
appear. This is especially the case in the following situations.■
Protruding objects, such as the rear of a truck and the like.
■
When driving from a horizontal surface into a slope or a depression.
■
When driving from a slope or a depression onto a horizontal surface.
Cruise Control System
Introduction
This chapter contains information on the following subjects:
Operation
107
Operation description
108
The Cruise Control System (CCS) maintains a set speed without you having to
actuate the accelerator pedal. The status where the CCS maintains the speed
is referred to hereinafter as the control.
ABC WARNING■
The general information relating to the use of assistance systems must
be observed » page 100, in section Introduction .■
After pressing the clutch pedal, no interrupted control occurs! For exam-
ple, if a different gear is engaged and the clutch pedal is released, control is
continued.
Operation
Fig. 134
Maxi DOT display: Examples of status displays the CCS
Fig. 135
Segment display: Examples of status displays the CCS
Read and observe
on page 107 first.
CCS status displays » Fig. 134 , » Fig. 135
Speed set, but control is inactive.
Control is active.
No speed set.
System fault - seek assistance from a specialist garage immediately.
107Assist systems
Basic requirements for starting the controlThe CCS is activated.
On vehicles with a manual transmission , the second gear or higher is en-
gaged.
On vehicles with an automatic transmission , the selector lever is in the
D/S position or in the Tiptronic position.
The current speed is higher than 20 km/h.
This, however, is only possible to the extent permitted by the engine output
and braking power of the vehicle.WARNINGIf the engine output or engine braking effect is insufficient to maintain the
set speed, the driver must assume control of the accelerator and brake
pedals!
Operation description
Fig. 136
Cruise control system controls
Read and observe on page 107 first.
Overview of the CCS controls » Fig. 136AActivate CCS (control deactivated) Interrupt control (sprung position) Deactivate CCS (delete set speed)BTake control again a)
/ Increase speedCStart control / reduce speedDSwitch between GRA and Speed Limitera)
If no speed is set the current speed is adopted.
Once the controls are activated, the CCS maintains the vehicle at the set
speed; the indicator light lights up in the instrument cluster.
Controls are automatically interrupted if any of the following occur.
▶ The brake pedal is operated.
▶ When one of the brake assist systems (e.g. ESC) intervenes.
▶ Through an airbag deployment.
▶ By pressing the button D
.
WARNING■ Always deactivate the cruise control system after use to prevent the sys-
tem being enabled unintentionally.■
Control may only be resumed if the set speed is not too high for the cur-
rent traffic conditions.
Note
■ During control, speed can be increased by pressing the accelerator pedal. Re-
leasing the accelerator pedal will cause the speed to drop again to the set
speed.■
By pressing the button
D
during the control this is cancelled and the Speed
Limiter is activated.
Speed limiter
Introduction
This chapter contains information on the following subjects:
Operation
109
Description of operation
109
The Speed Limiter limits the maximum driving speed to the set speed limit.
This limit can only be exceeded by depressing the accelerator pedal fully.
The condition in which the Speed Limiter monitors a potential set speed limit
excess is referred to as Regulation.
WARNINGThe general information relating to the use of assistance systems must be
observed » page 100, in section Introduction .108Driving
OperationFig. 137
Maxi DOT display: Examples of Speed Limiter status displays
Fig. 138
Segment display: Examples of Speed Limiter status displays
Read and observe
on page 108 first.
Status displays of the speed limiter » Fig. 137, » Fig. 138
Speed limit set, but regulation is inactive.
Control is active.
No speed limit set.
System fault - seek assistance from a specialist garage immediately.
Basic requirements for starting the control The Speed Limiter is activated.
The current speed is higher than 30 km/h.
Description of operationFig. 139
Operating elements of the speed limiter: Vehicle with Speed
Limiter / vehicle with GRA and Speed Limiter
Read and observe
on page 108 first.
Overview of the control elements of the speed limiter » Fig. 139AActivate Speed Limiter (regulation deactivated) For vehicles with GRA and Speed Limiter, the GRA is activated by
the switch in the
position by being adjusted. The activation of
the speed limiter occurs only after pressing the buttonD
.
Interrupt control (sprung position) Speed Limiter disable (set limit delete)BTake control again a)
/ increase speed - press (in increments of 1
km/h), hold (in increments of 10 km/h)CStart control/ reduce speed - press (in increments of 1 km/h), hold
(in increments of 10 km/h)DSwitching between CCS and speed limitera)
If no speed limit is set, the current speed is set as the speed limit.
After starting the system, the current speed is set as the speed limit, the
warning light lights up in the instrument cluster.
Exceeding the speed limit during the regulation
If, during the setting, it is necessary to exceed the speed limit (e.g. to over-
take), the accelerator pedal must be pressed fully.
When exceeding the speed limit (e.g. driving down a hill), an acoustic signal
sounds and the warning light flashes in the instrument cluster.
The regulation is resumed once the speed has fallen below the set limit.
109Assist systems
NoteBy pressing the button D during the control this is cancelled and the CCS is
activated.
Adaptive Cruise Control (ACC)
Introduction
This chapter contains information on the following subjects:
Operation
110
Automatic stop-start
111
Operation overview
111
Start control
112
Stop/resume control
112
Set/change the desired speed
112
Set the clearance level
113
Special driving conditions
113
Overtaking and towing
114
Malfunctions
114
The Adaptive Cruise Control (hereinafter referred to as ACC) maintains the set
speed or the distance to the vehicle ahead without the accelerator or brake
pedal being pressed.
The front of the vehicle and the distance to the vehicle ahead is monitored by
a radar sensor » page 100.
The state in which the ACC maintains the speed or the proximity is described
as control from here on.
WARNING■
The general information relating to the use of assistance systems must
be observed » page 100, in section Introduction .■
The driver must always be ready to take over the operation of the accel-
erator and brake pedal.
■
The ACC does not react when approaching a stationary obstacle, such as
traffic jams, vehicle breakdowns or vehicles waiting at a traffic light.
■
The ACC does not respond to crossing or oncoming objects.
■
If the ACC does not decelerate fast enough, immediately apply the vehi-
cle's foot brake.
WARNINGFor safety reasons, do not use the ACC under the following conditions.■When driving in turning lanes, motorway exits or construction sites, to
avoid an unwanted acceleration to the stored speed.■
When visibility is poor, (e.g. fog, heavy rain, thick snowfall).
■
When road conditions are poor (e.g. ice, slippery road, gravel, dirt road).
■
Driving into “sharp” corners or in steep gradients / on steep inclines.
■
When driving through places where metal objects (such as metal build-
ings, railway tracks, etc.) can be found.
■
When driving through very divided and enclosed spaces (such as large-ca-
pacity garages, car ferries, tunnels and the like.).
Note
■ The ACC is designed primarily for use on motorways.■The ACC reduces the speed by automatically releasing the accelerator or by
means of a braking procedure as appropriate. If the brakes are used for an au-
tomatic speed reduction at any moments, then the brake light illuminates.■
In case of failure of more than one brake light on the vehicle or on the con-
nected trailer, the ACC becomes unavailable.
■
The control automatically cancels the engagement of the brake supportive
assistance systems (e.g. ESC) or when the maximum permitted engine speed is
exceeded.
Operation
Fig. 140
Display of the instrument cluster: Examples of ACC displays
110Driving
Fig. 141
Display of the instrument cluster: Examples of ACC status dis-
plays
Read and observe
on page 110 first.
The ACC allows a speed of 30-160 km/h to be set or a distance to the preced-
ing vehicle to be very short of very long to be set.
The ACC adjusts the set speed with respect to the detected vehicle ahead,
thus maintaining the selected proximity.
The ACC can detect a vehicle that is up to approx. 120 m ahead using the radar
sensor.
ACC display » Fig. 140
Vehicle detected (control active)
Line showing the displacement of the distance when setting » page 113,
Set the clearance level
Set distance to the vehicle ahead
Vehicle detected (control deactivated)
ACC status displays » Fig. 141
Control deactivated.
Control activated - no vehicle detected.
Regulation deactivated - no speed stored.
Control activated (vehicle detected).
Note to reduce speed
If the delay of the ACC is insufficient in relation to the vehicle in front, the
warning light lights up in the instrument cluster and the display shows a
message to engage the brake pedal.
1234NoteSome ACC notifications in the display of the instrument cluster may be hidden
by notifications for other functions. An ACC notification automatically appears
for a brief moment when there is a change in status of the ACC.
Automatic stop-start
Read and observe
on page 110 first.
Vehicles with an automatic transmission can decelerate to a complete stop
and start moving again using the ACC.
Decelerate to a complete stop
If a vehicle ahead decelerates to a standstill, the ACC will also decelerate your
vehicle to a complete stop.
Starting to drive again after a holding period
As soon as the vehicle ahead starts moving again after a holding period, your
vehicle will also move and the speed will continue to be controlled. Control is
automatically disconnected in case of longer holding periods.
Operation overview
Fig. 142
Operating lever
Read and observe
on page 110 first.
Overview of ACC functions operated with the lever » Fig. 1421Activate ACC (control deactivated)2Start control (resume) / increase speed by 1 km/h at a time
(sprung position)3Interrupt control (sprung position) 111Assist systems
4Deactivate ACC5 Increase speed by 10 km/h at a time6 Decrease speed by 10 km/h at a timeA Set proximity levelBStart control / reduce speed in increments of 1 km/h
If the lever is set from the position
directly into the sprung position
the current speed is stored and the control process is started.
Start control
Read and observe
on page 110 first.
Basic requirements for start of control The ACC is activated.
On vehicles with manual transmission , the second gear or a higher gear is
selected and the current speed is greater than 25 km/h.
On vehicles with automatic transmission the selector lever is in the posi-
tion D / S or in the Tiptronic position and the current speed is higher than
2 km / h.
Start control
›
Press the button
» Fig. 142 on page 111 press.
›
Or Set the lever into the sprung position
» Fig. 142 on page 111 set.
The ACC takes the current driving speed and performs the control, the warning
light illuminates in the instrument cluster.
If the control is started by moving the lever to the position and should
the speed be stored already, the ACC adopts this speed and executes control.
Note
If control is started at a speed of less than 30 km/h on vehicles with an auto-
matic transmission, the speed of 30 km/h is stored. The speed increases auto-
matically to 30 km/h or is regulated with respect to the speed of the vehicle
ahead.
Stop/resume control
Read and observe
on page 110 first.
Stop control
›
Set the lever into the sprung position
» Fig. 142 on page 111 set.
›Or
Apply the brake.
Control stops, the speed remains stored.
Resume control›
Start control » page 112, Start control .
Note
Control is also stopped when the clutch pedal is held down for longer than 30
s or the TCS is deactivated.
Set/change the desired speed
Read and observe
on page 110 first.
The desired speed can be set or changed using the control lever » Fig. 142 on
page 111 .
Setting/changing the speed by increments of 10 km/h at a time ( ) - re-
quirements
The ACC is activated.
Increasing/reducing the speed by increments of 1 km/h at a time ( /
-
requirements
The ACC is activated.
Vehicle control takes place.
Changing the speed by adopting the current speed ( ) - requirements
The ACC is activated.
The vehicle is moving at a speed other than that which is stored.
Note
■
If during control the speed is increased by pressing the accelerator, control is
temporarily stopped. Upon releasing the accelerator, control is automatically
resumed.■
If during control the speed is reduced by applying the brake, control is stop-
ped. Control needs to be restarted in order to resume » page 112.
■
If the vehicle is controlled by a lower speed than the stored speed, then
the current speed is stored by pressing the button again
and the speed is
reduced in increments of 1 km/h.
112Driving