Page 121 of 340

Redu cing distance
"' Push the slider switch onc e to the left 0-
The distance currently set is shown for 3
seconds in the instrument cluster display.
"' Push the slider switch
again to the left 0 to
decrease the distance by one step.
The distance at which the adaptive cruise con trol follows a vehicle in front is determined by
time interva ls. A time interval to a vehicle in
front is established and maintained. Th is pro
duces a speed-dependent interval. The higher
the speed, the greater the safety interva l in
feet (meters)
¢ ,&. .
DISTANCE 1 Ada
pti ve crui se control 119
For example, if the interval DISTANCE 3 is
set, a vehicle in front is fo llowed at a
time in
terval
of 1.8 seconds.
For a speed of
50 mph ( 80 km /h ) this wo uld
be equivalent to a distance of
131 feet
(4 0 meter s) to the vehicle in front.
T he distances given here are nom inal va lues .
T he vehicle speed may exceed or fall shor t of
these target speeds, depending on the driving situation and the driving style of the vehicle
ahead .
DISTANCE 2 DISTANCE 3 DISTANCE4
Symbol c;:::::::;i _ c;:::::::;i _ - - c;:::::::;i _ - c;:::::::;i _ - c;:::::::;i _ - - c;:::::::;i _ c;:::::::;i _ - - _ c;:::::::;i
Time interva l 1 second
1.3 seconds 1.8 seconds 2.3 seconds
Dynamics Sporting Standard Standard Comfortab le
D istan ce at 25 mph 36 Feet (11 Me- 46 Feet (14 Me- 66 Feet (20 Me- 82 Feet (25 Me-
(40 km /h ) ters) ters) ters) ters)
Dist a nce at 50 mph 72 Feet (22 Me -
95 Feet (29 Me- 131 Fee t (40 167 Feet (51
(80 km /h) ters) ters) Meters) Meters)
Distanc e at 75 mph 108 Feet (33 144 Feet (44 197 Feet (60 249 Feet (76
(1 20 km /h) Meters) Meters) Meters) Meters)
H ow your vehicle responds when accelerating
and following other vehicles w ith ACC operat
ing can be adapted to your personal wishes
through diffe rent driving programs. Depend
ing on w hich driving p rog ram and wh ic h dis- tance
you choose, your vehicle will respond
more dynamically or more comfortably when
accelerat ing and braking. The setting is se
lected through the MM I menu
adapt ive cruise
contro l¢
page 124, MMI settings.
Settings DISTANCE 1 DISTANCE 2 DISTANCE 3 DISTANCE4
Symb ol for tim e inter -
val
c;:::::::;i _ c;:::::::;i _ - - c;:::::::;i _ - c;:::::::;i _ - c;:::::::;i _ - - c;:::::::;i _ c;:::::::;i _ - - _ c;:::::::;i
Support fo r: Bumper-to- Bumper-to- Bumper-to- Secondary roads,
bumper traffic, bumper traffic, bumper traffic, trailer operation
brisk driving "keeping pace" "keeping pace"
comfortably comfortably
Re spon se in "d ynam-
1 2 2
3 ic" dri ving program
Resp onse in "stand-
2 3 3 4 ard
" dr ivin g pr og ram
Re sponse in "comfort "
3 4 4 5 driving prog ram
(dynamic) 1 -----2 ----- 3 ----- 4 ----- 5 (comfortab le)
Page 122 of 340

120 Adapti ve crui se control
_&. WARNING
-
Following other vehicles too closely in
creases the risk of a crash and serious per
sonal injury .
- Following other vehicles too closely, par
ticu larly at higher speeds increases the
risk of coll is ions and serious personal in
jury.
- Setting short distances to the traffic
ahead reduces the time and distance
available to bring your vehicle to a safe
stop and makes it even more necessary
to pay close attention to traffic .
- Always select a speed and distance to
traffic ahead that is safe and appropriate
under the prevailing traff ic, road, weath
er and lighting conditions.
- Never rely on the distance control fea
ture of ACC a lone to prevent rear-end col
lis ions. Always be prepared to b rake and
take evasive act io n to avoid co llisions
and other ac cident situations.
- Never allow the clos ing speed between
yo u a nd other vehicles to be so h igh that
the adaptive cruise control may not be
able to slow your vehicle safe ly . If clos
ing speed is too high, yo u m ust app ly the
brakes yourself to reduce the risk of a
rear-end crash.
- Always select a greater following dis
tance to the veh icle ahead on wet roads
than on dry roads.
- Always read and heed the information
and WARNINGS
¢ &. in Description on
page 113.
(D Tips
The distance setting is reset to the factory
default
DIS TANCE 3 the next time the ig
nition is turned on.
Driver information
Displays in the instrument cluster
Applies to veh icles: w ith adaptive cruise contro l
Depending on the driving situation, driver in
formation is displayed in the instrument clus
ter .
Fig . 1 34 Overview ins tr u me nt cluster
@ Speedometer and indica to r li ght d isp lay
@ Display in the instrument cluster
@ Speedometer and indi cato r light
display
Important information concerning vehicle op
eration with adaptive cruise control is shown
in display a rea @. The desired speed you set is
i ndica ted in the speedometer (L ED lights
aro und the edge).
T he ind icator lights show whether the system
has detected a vehicle trave ling ahead .
@ Display in the in strument cluster
In display area @ information from the navi
gation system* and the tr ip computer is dis
played in addition to informat ion about adap
t ive cru ise control.
You can select among the different informa
t io n by repeated brief taps on the
I RESET I but
ton on the w indshie ld w iper lever
c::> page 25,
Operation .
Certain pieces of information in the bottom
part of the d isplay are not shown permanent
ly . Information is displayed only if you set or
change the speed setting, change the time in
te rva l, when messages are disp layed or if the
adaptive cruise contro l is turned off for safety
reasons .
Page 123 of 340

Display in the speedometer
Applies to vehicles: with adaptive cruise control
Fig. 135 D isplay in the speedomete r
Des ired spe ed
The desired speed set by the driver is dis
p layed by a red LED.
If the desi red speed was set between two
lines on the speedometer using the
I SETI but
ton, the two closest light emitting diodes will
come on <=>
fig. 135.
The system a llows only speeds to be set be
tween 20 to 95 mph (30 to 150 km/h) to be
set. This speed range is faint ly illuminated in
the speedometer (LED lights).
Ind icator light s (symbol s)
-- Open road :
The indicator light _
shows that ACC is active and that no moving
vehicle has been detected with in range of the radar sensor up ahead in your lane of
travel. The set speed is maintained.
- - Driving in tr aff ic: The indicator
light - shows that a vehicle moving in
your lane of travel has been detected up
front in your lane of travel. Your speed is ad
justed according to the speed of the vehicle
up front . ACC accelerates and brakes auto
matically within the system's capabilit ies .
-- Driver int erv ent ion prompt: The
red flashing warning light- means
Reque st for dri ver to assum e co ntr ol. You
as the dr iver must slow the vehicle with the
f oot brake. The symbol - tells you
t h at the adaptive cruise co ntrol is not able
to slow the vehicle down enough to keep a
enough distance to the vehicle in front of
you. A warning tone will also sound when
Ad apti ve crui se control 121
the symbol appears. For more information
about the driver intervention prompt
r::!) page 124.
_& WARNING
Improper use of the adaptive cruise con
trol features and inattention can lead to a
crash and serious personal injury.
- Never allow the closing speed between
you and othe r vehicles to be so high that
the adaptive cruise contro l may not be
able to slow your vehicle safely. If clos
ing speed is too high, you must apply the
brakes yo urself to reduce the risk of a
rear-end crash.
- Always select a greater following d is
tance to the vehicle up ahead on wet
roads than on dry roads.
- Always read and heed the information
and WARNINGS <=>
& in Description on
page 113 .
(D Tips
-If you use the accelerator to go faste r
t han t he speed of the vehicle ahead of
you, the dr iver intervention prompt will
not be accompan ied by a warn ing tone.
- If the speed you previously set is exceed
ed, the indicator light in the speedome
ter will switch off.
Display in the instrument cluster
Appl ies to vehicles: wit h adaptive cruise control
F ig. 136 D isp lay in the instrument cluster
-
Scroll through the available information dis
plays by br iefly tapp ing the
I RESET ! button at
the end of the windshield wipe r lever. You can ..,.
Page 124 of 340

122 Adaptive cruise control
select information from the trip computer,
navigation system* or adaptive cruise control.
@ Vehicle symbol
@ Distance
© Status
@Vehicle symbol
The vehicle symbol indicates whether the sys
tem has detected an object traveling in front .
-Vehicle outline: Open road, no vehicle
ahead.
- White vehicle: A vehicle is detected ahead.
-Red vehicle : Request for driver to assume
control.
@ Distance
Using the arrows and scale, you can detect
how far it is to the vehicle in front of you.
- Open road: No arrow appears when the ve
hicle is on an open road and there is no vehi
cle ahead.
- Driving in traffic: If a vehicle is detected
ahead, the arrow moves on the scale. The
green area represents the distance set.
When approach ing slow ly, the arrow moves
from the
gray zone to the green zone on the
scale .
-Driver intervention prompt : When ap
proaching rap idly, the arrow serves as an
early warning signal. If the d istance select
ed is exceeded or possibly not reached, the
arrow moves into the
red zone on the scale.
In certa in driving situations, you as the driv
er w ill have to take action
c::> page 124, Driv
er intervention prompt.
@Status
- The text ACC: Off appears in white letters
when adaptive cruise control is turned off.
- The text
ACC: Standby appears in white let
ters when the system is turned on but no
desired speed has been set.
- The text
ACC: override appears in white let
te rs when you exceed the desired speed by
acce lerat ing. - The text
DI
STANCE! appears in red letters
when the interva l to a vehicle traveling
ahead is too short and you have to slow your
veh icle additionally with the foot brake.
- The text messages
DISTANCE 1 to DIS
TANCE
4 appear in green letters to indicate
the t ime interval you have set and adapt ive
cruise control is in management mode.
- If the driving program "standard" is re
placed by "comfort" or "dynam ic" using the
MMI , the above text message is supple
mented by an appropriate prompt, e.g.
DIS
TANCE
1 -dyn .
System status indicator
Applies to vehicles : wi th adap tive c ruise contro l
The text messages and symbols shown in this
area of the display are not displayed perma
nently.
Fig. 137 System status indicator
Time intervals (such as.::::::, ____ .::::::,)
The different symbols for the time intervals
(distance) appear if you change the settings
c::>fig. 137.
Three white dots ... appear if a setting cannot
be made w ith the operating lever. The follow
ing are possible reasons
- If you pull the cont ro l lever towards you to
resume speed but no requested speed was
set.
- If you push the lever up to increase (or down
to reduce) speed when no speed has been
set previously.
- If you push the lever up to increase (or down
to red uce) speed and this speed is outs ide
Ill>
Page 125 of 340

the 20 to 95 mph (30 to 150 km/h) speed
range .
ACC: Unavailable
The text message ACC: Unavailable appears,
for example, if the temperature of the brakes
i s excessive. Adaptive cruise control is tempo
rarily not available. A warning tone sounds as
a reminder .
ACC: Not available
The text message ACC: Not available appears
in the event of a malfuncti on. Adaptive cruise
control is turned
off . A warning tone sounds
as a reminder. Have the system inspected by a
q ua lified dealership.
ACC: Sensor blocked
The text message ACC: Sensor blocked ap
pears when the ACC System can no longer ac
curately detect vehicles moving up ahead in
your lane of travel. Adaptive cruise control is turned
off. A warning tone also sounds as a re
minder.
To decide whether it is necessary to switch
off
the ACC (ACC : Sensor blocked) or if it is only a
temporary condition (ACC functionality limit
ed) the system will take into cons ideration the
outside temperature and/or the windshield
operat ion.
The ACC sensor is dirty or blocked (e.g. leaves,
snow).
The ACC sensor is located behind the area to
the right of the front license plate . If the ACC
sensor is dirty or blocked, clean the area to re
store system operat ion.
ACC off: Manual control!
The text message ACC off: Manual control!
appears after the ve hicle has been brought to
a standstill by the adaptive cruise control. In
this case you must depress the brake peda l to
prevent the veh icle from rolling. A warn ing
tone sounds as a reminder.
Adaptive cruise control 123
Stabilization control (ESC)
The text message Stabilization control (ESC)
appears if the Electronic Stabilization Control
(ESC) has intervened . In this case the adaptive
cruise control is automatically turned
off . This
is accompanied by a warn ing tone.
Speed
T he set speed in mph (Canada km/h) always
appears when saving or changing the speed in
adaptive cruise control
¢ page 116, How is
the speed stored?
and ~ page 117, Changing
stored speed.
ACC functionality limited
T he message ACC functionality limited ap
pears when the ACC System does not detect
any moving vehicles up ahead in yo ur lane of
trave l for a longer period of time. During this
time, the distance to moving vehicles in your
lane of travel up ahead is not being ma in
ta ined . The ACC system is not switched off,
and increased attention to the traffic situation
is absolutely necessary. The following may be
reasons why the message
ACC functionality
limited
appears :
- The ACC sensor is d irty . The ACC system is
not react ing, or is not reacting correctly, to
moving vehicles up ahead in your lane of
t ravel.
- There may be very light traffic on and there
is nothing that marks the side of the road
(for examp le, guard ra ils, traffic signs,
trees). As soon as a moving vehicle up ahead
is detected again, ACC becomes active again
and the message disappears.
T he ACC sensor is located be hind the area to
the right of the front license plate. If the ACC
senso r is dirty or blocked, clean the area to re
store system operation.
Parking brake!
T he text message Parking brake! appears,
when the parking brake is applied. ACC is
turned
off . A warning tone sounds as a re
minder.
Page 126 of 340

124 Adaptive cruise control
Stationary object ahead
The text message Stationary object ahead ap
pears, when you want to activate the system
and there is a stationary vehicle or an object
immediately in front of you .
Gradient too steep
The text message Gradient too steep appears
when the max imum gradient for proper ACC
operation has been exceeded. Adaptive cruise
contro l is turned
off . A warning tone also
sounds as a reminder.
Shift lever position!
The text message Shift lever position! ap
pears when the selector lever is moved to po
sition
N . In this position, adapt ive cruise con
trol is not ava ilab le .
Driver intervention prompt
Applies to vehicles: with adaptive cruise co ntrol
The driver intervention prompt calls on the
driver to toke over the situation.
Fig. 138 I n st rument cluste r: Drive r in terven tion
prompt
I n certain situat ions , the braking power of the
adapt ive cr uise control is not enough to main
tain an adequate distance to the vehicle up
ahead. In these situations, the adaptive cruise
control calls the driver to take action.
The
driver intervention prompt alerts you vis
ually and audib ly to take over.
- A red vehicle is shown in the instrument
cluster display ~
fig. 138.
- T he text DISTANCE! appears in the status
line. -
The indicator light- in the speedome
ter blinks red.
- A warning tone sounds.
0) Tips
-Adaptive cruise control is switched off af
ter pressing the footbrake. The speed
saved up this point can be resumed.
- To res um e the saved speed, release the
brake pedal and press the control lever
~ page 118, Turning adoptive cruise
control off temporarily.
-If you use the accelerator to go faster
than the speed of the vehicle ahead of
you, the
driver intervention prompt wi ll
not be accompanied by a warning s ignal.
- If the speed you previously set is exceed
ed, the indicator light in the speedome
ter will switch
off.
MMI settings
Applies to vehicles : with adaptive cruise contro l
Individual settings for adoptive cruise control
con be selected in the
MMI.
Settings for the Driving program can be ad
justed individually to the particular user and
saved in the MMI. This can only be done with
the engine running .
.,. Select:
!CARI function button> Systems*
cont ro l button > adaptive cruise control >
Driving program. Or
.,. Select: !CAR I function button > Car systems *
control button > Driver assist > Adaptive
cruise control
> Driving program .
Setting the driving program
In the Driving program menu you can adjust
the characteristics of adaptive cruise control
to your own preferences using
Dynamic,
Standard
or Comfort.
Saving settings
Your individual settings are automatically
saved and assigned to the remote control key
being used (remote key storage) . If the key is
Iii>
Page 127 of 340

given to another person, the saved settings remain as they are .
System limitations
General information
Applies to vehicles: with adaptive cruise co ntrol
The radar sensor has limits that the driver
must know to be able to use ACC properly .
The adaptive cruise control works within lim its that are also related to radar sensor range
and sight distance . In some situations ACC
may react unusually or late from the driver's
point of v iew. Therefore, always be attent ive
to what is happening around you and always
be ready to intervene, if necessary:
-when driving around curves ¢page 125
- when vehicles up front are not in line with
your vehicle ¢ page 126
- when other veh icles are changing lanes
i=> page 126
- when other vehicles are difficult to detect i=>page 126
- when vehicles up ahead are not moving or obstacles are in your travel lane i=>page 126
A WARNING
The radar sensor's function and range can
be reduced by rain, snow and heavy spray.
Moving veh icles up ahead may not be
prompt ly detec ted or may not be detected
a t all.
- Always pay careful att ention to the traf
fic s ituation and be ready to intervene
and be re ady to take comp lete cont rol
whenever necessary.
Ad apti ve crui se control 125
When driving around curves
App lies to vehicles: wit h adaptive cruise control
Fig. 139 Ve hicle e nter ing a curve
Fi g. 140 Ve hicle leav ing a curve
Entering a curv e
When entering a curve, the adaptive cruise
control may react to a vehicle in the next lane
and apply the brakes in your vehicle
¢ fig . 139. The braking action can be overrid·
den by depressing the accelerator pedal.
L e aving a curv e
At the end of very long curves, ACC's predic
tive lane reading can cause ACC to react to an
other vehicle in the next lane and app ly the
brakes on your vehicle¢ fig . 140. The braking
action can be overr idden by depress ing the ac
ce lerator pedal.
Page 128 of 340

126 Adaptive cruise control
Vehicles offset to one side
Applies to vehicles: with adaptive cruise control
Fig. 141 Vehicle traveling a head o utside the detect ion
range of t he rada r se nsor
Vehicles mov ing up ahead but offset i n the
la ne cannot be detected by ACC until they are
in sensor range.
Lane changes by other vehicles
Applies to vehicles: with adaptive cruise control
Fig. 142 A vehicle changes lanes
Vehicles that cut into your lane a sho rt dis
tance in front of you cannot be detected by
ACC until they are in senso r range.
Vehicles that are difficult to detect
Applies to vehicles: with adaptive cruis e contro l
Fig. 143 Two -wheeled vehicle driving ahead
Some vehicles moving up ahead in your lane
of trave l are difficult to detect, for examp le
two -wheeled veh icles, vehicles w ith high
ground clearance, loads sticking out the back .
Vehicles like this are often detected late or in
some situations not at all.
Stationary vehicles
Applies to vehicles: with adaptive cruise contro l
Fig. 144 Turning and stationary ve hicle
Fig. 145 Sheering out and stat ionary veh icle
If a vehicle that has been detected by ACC ex
its the highway or sheers out into the neigh
boring travel lane, and there is a stationary
vehicle ahead of that vehicle, ACC will not de·
tect or react to that stationary vehicle
<=> fig. 144 and c> fig. 145 .