brakes MERCEDES-BENZ GLE SUV 2017 W166 Owner's Guide

Ryou activateth eOffroad Plus progra m(vehi-
cle swit hth eOff-Road Engineerin gpackage)
Ryou shift th etransmission to position Nwhile
drivin g
If cruise control is deactivated, you will hear a
warnin gtone .You will see th eCruise Con ‐
trolOffmessage in th emultifunction display
for approximately fiv eseconds.
iWhe nyou switch off th eengine, th elast
speed store dis cleared .
Distance Pilot DISTRONIC
Gene ral notes
Distanc ePilo tDISTRONI Cregulates th espeed
and automatically help syou maintai nth edis-
tance to th evehicl edetecte din front. Vehicles
are detecte dwit hth eaid of th erada rsensor
system. Distanc ePilo tDISTRONI Cbrakes auto-
matically so that th eset speed is no texceeded .
You mus tselect alower gear in goo dtime on
lon gand steep downhill gradients ,especially if
th evehicl eis laden or towin g atrailer .By doin g
so, you will mak euse of th ebrakin geffec tof th e
engine. This relieves th eload on th ebrak esys-
te m and prevents th ebrakes from overheating
and wearin gto oquickly.
If Distanc ePilo tDISTRONI Cdetects that there is
a ris kof acollision ,you will be warned visually
and acoustically. Without your intervention ,Dis-
tance Pilo tDISTRONI Ccanno tpreven t acolli-
sion .An intermittent warnin gtone will then
soun dand th edistanc ewarnin glamp will ligh t
up in th einstrumen tcluster. Brake immediately
in order to increase th edistanc eto th evehicl ein
fron tor tak eevasive action provided it is saf eto
do so.
Fo rDistanc ePilo tDISTRONI Cto assist you
when driving, th erada rsensor system mus tbe
operational.
Dis
tanc ePilo tDISTRONI Coperate sin th erange
between 0mph (0 km/h) and 12 0mph
(20 0km/h).
Do no tuse Distanc ePilo tDISTRONI Cwhile driv-
in g on roads wit hsteep gradients .
Since Distanc ePilo tDISTRONI Ctransmit srada r
waves, it can resemble th erada rdetectors of
th eresponsibl eauthorities. You can refer to th e
relevan tchapter in th eOperator' sManual if
question sare asked about this.
iUS Aonly:
This device has been approve dby th eFCC as
a "Vehicular Radar System". The rada rsensor
is intended for use in an automotive rada r
system only. Removing, tamperin gwith, or
altering th edevice will voi dany warranties,
and is no tpermitte dby th eFCC. Do no ttam -
per with, alter, or use in any non-approve d
way.
An yunauthorize dmodification to this device
could voi dth euser’s authorit yto operate th e
equipment.
iCanada only: This device complies wit h
RSS-210 of Industry Canada. Operation is
subjec tto th efollowin gtw oconditions:
1. This device may no tcaus eharmful inter-
ference ,and
2. This device mus taccept any interferenc e
received, includin ginterferenc ethat may
caus eundesired operation of th edevice .
Removal, tampering, or altering of th
ed
evice
will voi dany warranties, and is no tpermitted.
Do no ttamper with, alter, or use in any non-
approve dway.
An yunauthorize dmodification to this device
could voi dth euser's authorit yto operate th e
equipment.
Imp ortant safety notes
GWARNIN G
Distanc ePilo tDISTRONI Cdoes no treac tto :
Rpeople or animals
Rstationary objects on th eroad, e.g. stoppe d
or parked vehicles
Roncomin gvehicles and crossin gtraffic
As aresult ,Distanc ePilo tDISTRONI Cmay
neither giv ewarnings no rinterven ein suc h
situations. There is aris kof an accident.
Always pay careful attention to th etraffic sit -
uation and be read yto brake.
GWARNIN G
Distanc ePilo tDISTRONI Ccanno talways
clearly identify other roa duser sand complex
traffic situations.
168Driving systems
Driving and parking

In such cases, Distance Pilot DISTRONIC may:
Rgive an unnecessary warning and then
brake the vehicle
Rneither give a warning nor intervene
Raccelerate or brake unexpectedly
There is a risk of an accident.
Continue to drive carefully and be ready to
brake, especially if Distance Pilot DISTRONIC
warns you.
GWARNING
Distance Pilot DISTRONIC brakes your vehicle with up to 50% of the maximum possible
deceleration. If this deceleration is not suffi-
cient, Distance Pilot DISTRONIC alerts you
with a visual and acoustic warning. There is a
risk of an accident.
Apply the brakes yourself in these situations
and try to take evasive action.
!When Distance Pilot DISTRONIC or the
HOLD function is activated, the vehicle
brakes automatically in certain situations.
To avoid damage to the vehicle, deactivate
DISTRONIC PLUS and the HOLD function in
the following or similar situations:
Rwhen towing the vehicle
Rin the car wash
If you fail to adapt your driving style, Distance
Pilot DISTRONIC can neither reduce the risk of
an accident nor override the laws of physics.
Distance Pilot DISTRONIC cannot take into
account road, weather or traffic conditions. Dis-
tance Pilot DISTRONIC is only an aid. You are
responsible for the distance to the vehicle in
front, for vehicle speed, for braking in good time
and for staying in your lane.
Do not use Distance Pilot DISTRONIC:
Rin road and traffic conditions which do not
allow you to maintain a constant speed, e.g. in
heavy traffic or on winding roads
Ron slippery road surfaces. Braking or accel-
erating could cause the drive wheels to lose
traction and the vehicle could then skid
Rwhen there is poor visibility, e.g. due to fog,
heavy rain or snow Distance Pilot DISTRONIC may not detect nar-
row vehicles driving in front, e.g. motorcycles, or
vehicles driving on a different line.
In particular, the detection of obstacles can be
impaired if:
Rthere is dirt on the sensors or anything else
covering the sensors
Rthere is snow or heavy rain
Rthere is interference by other radar sources
Rthere are strong radar reflections, for exam-
ple, in parking garages
If Distance Pilot DISTRONIC no longer detects a
vehicle in front, it may unexpectedly accelerate
to the speed stored.
This speed may:
Rbe too high if you are driving in a filter lane or an exit lane
Rbe so high when driving in the right-hand lanethat you overtake vehicles in the left-hand
lane
Rbe so high when driving in the left-hand lane
that you overtake vehicles in the right-hand
lane
If there is a change of drivers, advise the new
driver of the speed stored.
Cruise control lever
:Activates or increases speed
;Activates or reduces speed
=Deactivates Distance Pilot DISTRONIC
?Activates at the current speed/last stored
speed
ASets a specified minimum distance
Driving systems169
Driving and parking
Z

Activating Distance Pilot DISTRONIC
Activation conditions
To activat eDistanc ePilo tDISTRONIC, th efol -
lowin gcondition smus tbe fulfilled :
Rtheengin emus tbe started. It may tak eup to
two minute sof drivin gbefore Distanc ePilo t
DISTRONI Cis read yfor use.
Rth eelectric parking brak emus tbe released.
RES P®mus tbe active ,but no tintervening .
Rthetransmission mus tbe in position D.
Rthedriver's door mus tbe closed when you
shif tfrom Pto Dor your seat belt mus tbe
fastened.
Rth efront-passenger door and rear door smus t
be closed.
Rth eOffroad Plus drive program mus tbe deac -
tivated (vehicles wit hth eOff-Road Engineer -
ing package).
RDS Rmus tbe deactivated.
Rth evehicl emus tno tskid.
Acti vating
XBriefly pull th ecruise control lever toward s
you =,up: or down ?.
Distanc ePilo tDISTRONI Cis activated.
XRemove your foo tfrom th eaccelerato rpedal .
Your vehicl eadapt sits spee dto that of th e
vehicl ein front, but only up to th edesired
store dspeed.
iIf you do no tfully release th eaccelerato r
pedal ,th eDistance Pilot Passiv emes-
sage appear sin th emultifunction display. The
set distanc eto aslower-moving vehicl ein
fron twill then no tbe maintained. You will be
drivin gat th espee dyou determine by th e
position of th eaccelerato rpedal .
You can also activat eDistanc ePilo tDISTRONI C
when stationary. The lowes tspee dthat can be
set is 20 mph (30 km/h).
XBriefly pull th ecruise control lever toward s
you =,up: or down ?.
Distanc ePilo tDISTRONI Cis activated.
Acti vates at th ecurren tspeed/las t
store dspeed
GWARNIN G
If you call up th estore dspee dand it differ s
from th ecurren tspeed, th evehicl eacceler -
atesor decelerates. If you do no tknow th e
store dspeed, th evehicl ecould accelerate or
brak eunexpectedly. There is aris kof an acci-
dent.
Pay attention to th eroad and traffic condi-
tion sbefore calling up th estore dspeed. If you
do no tknow th estore dspeed, store th e
desired spee dagain .
XBriefly pull th ecruise control lever toward s
you =.
XRemove your foo tfrom th eaccelerato rpedal .
The first time Distanc ePilo tDISTRONI Cis
activated, it store sth ecurren tspee dor reg -
ulates th espee dof th evehicl eto th estore d
speed.
Driving with Distance Pilot DISTRONIC
Pulling awa yand drivin g
XIf you want to pull awa ywit hDistance
Pilot DISTRONIC: remove your footfrom th e
brak epedal .
XBriefly pull th ecruise control lever toward s
you ?.
or
XAccelerate briefly.
Your vehicl epulls away and adapt sits spee d
to that of th evehicl ein front. If no vehicl eis
detecte din front, your vehicl eaccelerate sto
th eset speed.
The vehicl ecan also pull away when it is facing
an unidentifie dobstacle or is drivin gon adiffer -
en tlin efrom another vehicle. The vehicl ethen
brakes automatically.
If there is no vehicl ein front, Distanc ePilo t
DISTRONI Coperate sin th esam eway as cruise
control .
If Distanc ePilo tDISTRONI Cdetects aslower-
moving vehicl ein front, it brakes your vehicle. In
this way, th edistanc eyou hav eselected is main -
tained.
If Distanc ePilo tDISTRONI Cdetects afaster-
moving vehicl ein front, it increases th edrivin g
speed. However, th evehicl eis only accelerate d
up to th espee dyou hav estored.
170Driving systems
Driving and parking

Selecting the drive program
Distance Pilot DISTRONIC supports a sporty
driving style if you have selected theSportor
Sport Plus drive program (
Ypage 143). Accel-
eration behind the vehicle in front or to the set
speed is then noticeably more dynamic. If you
have selected the Comfortdrive program, the
vehicle accelerates more gently. This setting is
recommended in stop-and-start traffic.
Changing lanes
If you change to the overtaking lane, Distance
Pilot DISTRONIC supports you if:
Ryou are driving faster than 45 mph (70 km/h)
Ryou switch on the appropriate turn signal
RDistance Pilot DISTRONIC does not currently
detect a danger of collision
If these conditions are fulfilled, your vehicle is
accelerated. Acceleration will be interrupted if
changing lanes takes too long or if the distance
between your vehicle and the vehicle in front
becomes too small.
iWhen you change lanes, Distance Pilot
DISTRONIC monitors the right lane (in left-
side traffic) or the left lane (in right-side traf-
fic).
Stopping
GWARNING
When leaving the vehicle, even if it is braked
only by DISTRONIC PLUS, it could roll away if:
Rthere is a malfunction in the system or in
the voltage supply.
RDISTRONIC PLUS has been deactivated
with the cruise control lever, e.g. by a vehi-
cle occupant or from outside the vehicle.
Rthe electrical system in the engine com-
partment, the battery or the fuses have
been tampered with.
Rthe battery is disconnected.
Rthe accelerator pedal has been depressed, e.g. by a vehicle occupant.
There is a risk of an accident.
If you wish to exit the vehicle, always turn off
DISTRONIC PLUS and secure the vehicle
against rolling away. If Distance Pilot DISTRONIC detects that the
vehicle in front is stopping, it brakes your vehicle
to a stop.
Once your vehicle is stationary, it remains sta-
tionary and you do not need to depress the
brake.
After a time, the electric parking brake secures
the vehicle and relieves the service brake.
Depending on the specified minimum distance,
your vehicle will come to a standstill at a suffi-
cient distance behind the vehicle in front. The
specified minimum distance is set using the
control on the cruise control lever.
The transmission is shifted automatically to
position P if, with Distance Pilot DISTRONIC
activated and the vehicle stationary:
Rthe driver's door is open and the driver's seat
belt is unfastened.
Rthe engine is switched off, unless it is auto-
matically switched off by the ECO start/stop
function.
The electric parking brake secures the vehicle
automatically if, with Distance Pilot DISTRONIC
activated and the vehicle stationary:
Ra system malfunction occurs.
Rthe power supply is not sufficient.
On steep uphill or downhill inclines or if there is
a malfunction, the transmission may also be
automatically shifted into position P.
Setting a speed
Keep in mind that it may take a brief moment
until the vehicle has accelerated or braked to
the speed set.
XPress the cruise control lever up:for a
higher speed or down Afor a lower speed
XTo adjust the set speed in1 mphincre-
ments (1 km/hincrements): briefly press
the cruise control lever up :or down ;to
the pressure point.
Every time the cruise control lever is pressed
up : or down ;the last speed stored is
increased or reduced.
XTo adjust the set speed in5 mphincre-
ments (10 km/hincrements): briefly press
the cruise control lever up :or down ;to
the pressure point.
Every time the cruise control lever is pressed
up : or down ;, the last speed stored is
increased or reduced.
Driving systems171
Driving and parking
Z

HOLD function
General notes
The HOLD function can assist the driver in the
following situations:
Rwhen pulling away, especially on steep slopes
Rwhen maneuvering on steep slopes
Rwhen waiting in traffic
The vehicle is kept stationary without the driver having to depress the brake pedal.
The braking effect is canceled and the HOLD
function deactivated when you depress the
accelerator pedal to pull away.
iDo not use the HOLD function when driving
off-road, on steep uphill or downhill gradients
or on slippery or loose surfaces. The HOLD
function cannot hold the vehicle on such sur-
faces.
Important safety notes
GWARNING
When leaving the vehicle, it can still roll away despite being braked by the HOLD function if:
Rthere is a malfunction in the system or in
the voltage supply.
Rthe HOLD function has been deactivated by
pressing the accelerator pedal or the brake
pedal, e.g. by a vehicle occupant.
Rthe electrical system in the engine com-
partment, the battery or the fuses have
been tampered with.
Rthe battery is disconnected
There is a risk of an accident.
If you wish to exit the vehicle, always turn off the HOLD function and secure the vehicle
against rolling away.
!When DISTRONIC PLUS or the HOLD func-
tion is activated, the vehicle brakes automat-
ically in certain situations.
To avoid damage to the vehicle, deactivate
DISTRONIC PLUS and the HOLD function in
the following or similar situations:
Rwhen towing the vehicle
Rin the car wash
Deactivating the HOLD function (
Ypage 179).
Activation conditions
You can activate the HOLD function if:
Rthe vehicle is stationary
Rthe engine is running or if it has been auto-
matically switched off by the ECO start/stop
function
Rthe driver's door is closed or your seat belt is
fastened
Rthe electric parking brake is released
Rthe transmission is in position D,R or N
RDistance Pilot DISTRONIC is deactivated
Activating the HOLD function
XMake sure that the activation conditions are
met.
XDepress the brake pedal.
XQuickly depress the brake pedal further
until :appears in the multifunction display.
The HOLD function is activated. You can
release the brake pedal.
iIf depressing the brake pedal the first time
does not activate the HOLD function, wait
briefly and then try again.
Deactivating the HOLD function
The HOLD function is deactivated automatically
if:
Ryou accelerate and the transmission is in
position Dor R.
Ryou shift the transmission to position P.
Ryou depress the brake pedal again with a cer-
tain amount of pressure until :disappears
from the multifunction display.
Ryou secure the vehicle using the electric park- ing brake.
Ryou activate Distance Pilot DISTRONIC.
iAfter a time, the electric parking brake
secures the vehicle and relieves the service
brake.
Driving systems179
Driving and parking
Z

the immediate vicinity of the vehicle. You
could damage the vehicle or the objects.
The sensors may not detect snow and other
objects that absorb ultrasonic waves.
Ultrasonic sources such as an automatic car
wash, the compressed-air brakes on a truck
or a pneumatic drill could cause PARKTRONIC
to malfunction.
PARKTRONIC may not function correctly on
uneven terrain.
!Fold in the ball coupling if the trailer tow
hitch is not required. PARKTRONIC measures
the minimum detection range to an obstacle
from the bumper, not the ball coupling.
Parking Assist PARKTRONIC is deactivated for
the rear area when you establish an electrical
connection between your vehicle and a trailer.
Parking Assist PARKTRONIC is activated auto-
matically when you:
Rswitch on the ignition
Rshift the transmission to position D,R or N
Rrelease the electric parking brake
Parking Assist PARKTRONIC is deactivated at
speeds above 11 mph (18 km/h). It is reactiva-
ted at lower speeds.
Range of the sensors
General notes
Parking Assist PARKTRONIC does not take into
account obstacles located:
Rbelow the detection range, e.g. people, ani-
mals or objects.
Rabove the detection range, e.g. overhanging
loads, truck overhangs or loading ramps.
:Sensors in the front bumper, left-hand side
(example) The sensors must be free from dirt, ice or slush.
They can otherwise not function correctly. Clean
the sensors regularly, taking care not to scratch
or damage them (
Ypage 323).
Range
Front sensors
CenterApprox. 40 in (approx.
100 cm)
CornersApprox. 24 in (approx.
60 cm)
Rear sensors
CenterApprox. 48 in (approx.
120 cm)
CornersApprox. 32 in (approx.
80 cm)
Minimum distance
CenterApprox. 8 in (approx. 20 cm)
CornersApprox. 6 in (approx. 15 cm)
If there is an obstacle within this range, the rel-
evant warning displays light up and a warning
Driving system
s185
Driving an d parking
Z

Rthat are parallel to the direction of travel andat least 39.5 in (1.0 m)longer than your vehi-
cle
Rthat are at right angles to the direction of
travel and at least 39.5 in (1.0 m) wider than
your vehicle
iNote that Parking Pilot PARKTRONIC cannot
measure the depth of parking spaces if they
are at right angles to the direction of travel.
You need to judge whether your vehicle will fit
into the parking space.
When driving at speeds below 19 mph
(30 km/h), you will see parking symbol ;as a
status indicator in the instrument cluster. When
a parking space has been detected, an arrow
towards the right or the left also appears. Park-
ing Pilot displays only parking spaces on the
front-passenger side as standard. Parking
spaces on the driver's side are displayed as
soon as the turn signal on the driver's side is
activated. When parking on the driver's side,
this must remain activated until you confirm the use of Parking Pilot by pressing the abutton
on the multifunction steering wheel. The system
automatically determines whether the parking
space is parallel or at right angles to the direc-
tion of travel.
A parking space is displayed while you are driv- ing past it, and until you are approximately 50 ft
(15 m) away from it.
Parking
GWARNING
If you leave the vehicle when it is only being
braked by Active Parking Assist it could roll
away if:
Rthere is a malfunction in the system or in
the voltage supply.
Rthe electrical system in the engine com-
partment, the battery or the fuses have
been tampered with.
Rthe battery is disconnected.
Rthe accelerator pedal has been depressed,
e.g. by a vehicle occupant.
There is a risk of an accident.
Before leaving the vehicle, always secure it
against rolling away.
iIf Parking Assist PARKTRONIC detects
obstacles, Parking Pilot brakes automatically
whilst the vehicle is being parked. You are
responsible for braking in good time.
XStop the vehicle when the parking space sym- bol shows the desired parking space in the
instrument cluster.
XShift the transmission to position R.
The Start Parking Pilot? Yes: OK No:
% message appears in the multifunction
display.
XTo cancel the procedure: press the%
button on the multifunction steering wheel or
pull away.
or
XTo park using Parking Pilot: press thea
button on the multifunction steering wheel.
The Parking Pilot Active Accelerate
and Brake Observe Surroundingsmes-
sage appears in the multifunction display.
XLet go of the multifunction steering wheel.
XBack up the vehicle, being ready to brake at all
times. When backing up, drive at a speed
below approximately 6 mph (10 km/h). Oth-
erwise, Parking Pilot will be canceled.
Parking Pilot brakes the vehicle to a standstill
when the vehicle approaches the rear border
of the parking space.
Maneuvering may be required in tight parking
spaces.
The Parking Pilot Active Select D
Observe Surroundingsmessage appears in
the multifunction display.
XShift the transmission to position Dwhile the
vehicle is stationary.
Parking Pilot immediately steers in the other
direction.
The Parking Pilot Active Accelerate
and Brake Observe Surroundingsmes-
sage appears in the multifunction display.
iYou will achieve the best results by waiting
for the steering procedure to complete before
pulling away.
XDrive forwards and be ready to brake at all
times.
Parking Pilot brakes the vehicle to a standstill.
The Parking Pilot Active Select R
Observe Surroundingsmessage appears in
the multifunction display.
As soon as the parking procedure is complete,
the Parking Pilot Finished
message
Driving systems189
Driving and parking
Z

appears and a warning tone sounds. The vehicle
is now parked. The vehicle is kept stationary
without the driver having to depress the brake
pedal. The braking effect is canceled when you
depress the accelerator pedal.
Parking Pilot no longer supports you with steer-
ing interventions and brake applications. When
Parking Pilot is finished, you must steer and
brake again yourself. Parking Assist
PARKTRONIC is still available.
Parking tips:
RThe way your vehicle is positioned in the park-
ing space after parking is dependent on vari-
ous factors. These include the position and
shape of the vehicles parked in front and
behind it and the conditions of the location. It
may be the case that Parking Pilot guides youtoo far into a parking space, or not far enough
into it. In some cases, it may also lead you
across or onto the curb. If necessary, you
should cancel the parking procedure with
Parking Pilot.
RYou can also select preselect transmission
position D. The vehicle redirects and does not
drive as far into the parking space. Should the
transmission change take place too early, the parking procedure will be canceled. A sensi-
ble parking position can no longer be ach-
ieved from this position.
Exiting a parking space
In order for Parking Pilot to assist you:
Rthe border of the parking space must be high
enough at the front and the rear. A curb is too
small, for example.
Rthe border of the parking space must not be
too wide, as the position of the vehicle must
not exceed an angle of 45° to the starting
position as it is maneuvering into the parkingspace.
Ra maneuvering distance of at least 3.3 ft
(1.0 m) must be available.
Parking Pilot can assist you with exiting a park-
ing space only if you have parked the vehicle
parallel to the direction of travel.
iIf Parking Assist PARKTRONIC detects
obstacles, Parking Pilot brakes automatically
whilst the vehicle is exiting the parking space.
You are responsible for braking in good time.
XStart the engine.
XRelease the electric parking brake.
XSwitch on the turn signal in the direction you
will drive out of the parking space.
XShift the transmission to position Dor R.
The Start Parking Pilot? Yes: OK No:
% message appears in the multifunction
display.
XTo cancel the procedure: press the%
button on the multifunction steering wheel or
pull away.
or
XTo exit a parking space using Parking
Pilot: press the abutton on the multi-
function steering wheel.
The Parking Pilot Active Accelerate
and Brake Observe Surroundingsmes-
sage appears in the multifunction display.
XLet go of the multifunction steering wheel.
XPull away, being ready to brake at all times. Do
not exceed a maximum speed of approx-
imately 6 mph (10 km/h) when exiting a park-
ing space. Otherwise, Parking Pilot will be
canceled.
XShift the transmission to position Dor Ras
required or according to the message while
the vehicle is stationary.
Parking Pilot immediately steers in the other
direction. The Parking Pilot Active
Accelerate and Brake Observe Sur‐roundingsmessage appears in the multi-
function display.
iYou will achieve the best results by waiting
for the steering procedure to complete before
pulling away.
If you back up after activation, the steering
wheel is moved to the straight-ahead posi-
tion.
XDrive forwards and back up as prompted by
the Parking Assist PARKTRONIC warning dis-
plays, several times if necessary.
Once you have exited the parking space com-
pletely, the steering wheel is moved to the
straight-ahead position. You hear a tone and the
Parking
PilotFinishedmessage appears in
the multifunction display. You will then have to
steer and merge into traffic on your own. Park-
ing Assist PARKTRONIC is still available. You can
take over the steering before the vehicle has
exited the parking space completely. This is
useful, for example when you recognize that it is
already possible to pull out of the parking space.
190Driving systems
Driving and parking

Rthe LOW RANGE offroad gear is activated
(vehicles with the Offroad Engineering pack-
age).
Ra loss of tire pressure or a defective tire is
detected.
Switching on Active Blind Spot Assist
XMake sure that Active Blind Spot Assist is
activated in the on-board computer
(
Ypage 232).
XTurn the SmartKey to position2in the ignition
lock.
Warning lamps :in the exterior mirrors light
up red for approximately 1.5 seconds and
then turn yellow.
Towing a trailer
When you attach a trailer, make sure you have
correctly established the electrical connection.
This can be accomplished by checking the trailer
lighting. Active Blind Spot Assist is then deacti-
vated. The indicator lamp lights up yellow in the
exterior mirrors and the Active Blind Spot
Asst. Not Available When Towing aTrailer See Operator's Manualmessage
appears in the multifunction display.
Active Lane Keeping Assist
General notes
Active Lane Keeping Assist monitors the area in
front of your vehicle by means of multifunction
camera :at the top of the windshield. Various
different areas to the front, rear and side of your
vehicle are also monitored with the aid of the
radar sensor system. Active Lane Keeping
Assist detects lane markings on the road and
can warn you before you leave your lane unin-
tentionally. If you do not react to the warning, a lane-correcting application of the brakes can
bring the vehicle back into the original lane.
This function is available in a speed range
between 40 mph and 120 mph (60 km/h and
200 km/h).
For Active Lane Keeping Assist to assist you
when driving, the radar sensor system must be
operational.
Important safety notes
If you fail to adapt your driving style, Active Lane
Keeping Assist can neither reduce the risk of
accident nor override the laws of physics. Active
Lane Keeping Assist cannot take into account
road, weather or traffic conditions. Active Lane
Keeping Assist is only an aid. You are responsi-
ble for the distance to the vehicle in front, for
vehicle speed, for braking in good time and for
staying in your lane.
Active
Lane Ke
eping Assist cannot continuously
keep your vehicle in its lane.
GWARNING
Active Lane Keeping Assist cannot always
clearly detect lane markings.
In such cases, Active Lane Keeping Assist
can:
Rgive an unnecessary warning and then
make a course-correcting brake application
to the vehicle
Rnot give a warning or intervene
There is a risk of an accident.
Always pay particular attention to the traffic
situation and keep within the lane, especially
if Active Lane Keeping Assist alerts you. Ter-
minate the intervention in a non-critical driv-
ing situation.
The system may be impaired or may not function
if:
Rthere is poor visibility, e.g. due to insufficient
illumination of the road, or due to snow, rain,
fog or spray
Rthere is glare, e.g. from oncoming traffic, the
sun or reflection from other vehicles (e.g. if
the road surface is wet)
Rthe windshield is dirty, fogged up, damaged or
covered, for instance by a sticker, in the vicin-
ity of the camera
Driving system s207
Driving an d parking
Z

!A function or performance test should only
be carried out on a two-axle dynamometer.
Before you operate the vehicle on such a
dynamometer, please consult a qualified
workshop. You could otherwise damage the
drive train or the brake system.
iIn wintry driving conditions, the maximum
effect of 4MATIC can only be achieved if you
use winter tires (M+S tires), with snow chains
if necessary.
Further information about "Driving off-road"
(
Ypage 162).
DSR (Downhill Speed Regulation)
General notes
DSR is an aid to assist you when driving down-
hill. It keeps the speed of travel at the speed
selected on the on-board computer. The steeper
the downhill gradient, the greater the DSR brak- ing effect on the vehicle. When driving on flat
stretches of road or on an uphill gradient, the
DSR braking effect is minimal or nonexistent.
DSR controls the vehicle’s speed when it is acti-
vated and the transmission is in position D,Ror
N. You can drive at a higher or a lower speed
than that set on the on-board computer at any
time by accelerating or braking.
Important safety notes
GWARNING
If the speed driven and the set speed deviate and you activate DSR on a slippery road sur-
face, the wheels may lose traction. There is an
increased danger of skidding and accidents.
Before switching DSR on, please take into
consideration the road surface and the differ- ence between driving speed and the set
speed.
If you fail to adapt your driving style, DSR can
neither reduce the risk of accident nor override the laws of physics. DSR cannot take account of
road, weather and traffic conditions. DSR is only
an aid. You are responsible for the distance to
the vehicle in front, for vehicle speed, for brak-
ing in good time and for staying in your lane.
You are always responsible for keeping control
of the vehicle and for assessing whether the
downhill gradient can be managed. DSR may not always be able to keep to the set speed, depend- ing on road surface and tire conditions. Select a
set speed suitable for the prevailing conditions
and when necessary, apply the brakes manually.
Activating DSR
XPress button
:.
Indicator lamp ;lights up.
The à DSR symbol appears in the multi-
function display.
You can only activate DSR when driving at
speeds below 25 mph (40 km/h).
If the current vehicle speed is too high, the Ã
DSR symbol appears in the multifunction display
with the Max. speed 25 mph
message (Can-
ada: 40 km/h).
If you have activated DSR and you change the
drive program, DSR is deactivated. If you switch
between the offroad and offroad plus drive pro-
grams, DSR remains activated.
Deactivating DSR
XPress button :.
Indicator lamp ;goes out.
The à DSR symbol appears in the multi-
function display with the Off
message.
On vehicles with the Offroad Engineering pack-
age, if you select a different drive program, DSR is also deactivated. If you switch between the
Offroad programs, DSR remains activated.
DSR switches off automatically if you drive
faster than 28 mph (Canada: 45 km/h). The
à DSR symbol appears in the multifunction
display with the Off
message. The status indi-
cator in the multifunction display goes out. You
also hear a warning. On vehicles with the Off-
road Engineering package, if you select a differ-
ent onroad/offroad program, DSR is also deac-
tivated.
210Driving systems
Driving and parking