XHold test gaugeAvertically on brake
disc :and slide measuring pin ;onto
brake disc :.
XCheck which color field ?the arrow on
measuring pin ;is pointing to.
Green: the brake pad/lining thickness is
sufficient.
Red : the brake pad/lining thickness is not
sufficient. Have the brake pads/lining
checked at a qualified specialist workshop.
iTo avoid an inaccurate measurement:
Rmake sure you position the wheels suit-
ably
Rdo not put the measuring pin on a recess
in the brake disc
Driving on wet roads
Hydroplaning
If water has accumulated to a certain depth
on the road surface, there is a danger of
hydroplaning occurring, even if:
Ryou drive at low speeds.
Rthe tires have adequate tread depth.
For this reason, in the event of heavy rain or in
conditions in which hydroplaning may occur,
you must drive in the following manner:
Rlower your speed.
Ravoid ruts.
Ravoid sudden steering movements.
Rbrake carefully.
Driving on flooded roads
!Do not drive through flooded areas.
Check the depth of any water before driving through it. Drive slowly through standing
water. Otherwise, water may enter the
vehicle interior or the engine compartment.
This can damage the electronic compo-
nents in the engine or the automatic trans-
mission. Water can also be drawn in by the
engine's air suction nozzles and this can
cause engine damage.
Winter driving
GWARNING
If you shift down on a slippery road surface in an attempt to increase the engine's braking
effect, the drive wheels could lose their grip.
There is an increased danger of skidding and
accidents.
Do not shift down for additional engine brak-
ing on a slippery road surface.
GDANGER
If the exhaust pipe is blocked or adequate
ventilation is not possible, poisonous gases
such as carbon monoxide (CO) may enter the vehicle. This is the case, e.g. if the vehicle
becomes trapped in snow. There is a risk of
fatal injury.
If you leave the engine or the auxiliary heating
running, make sure the exhaust pipe and area
around the vehicle are clear of snow. To
ensure an adequate supply of fresh air, open a
window on the side of the vehicle that is not
facing into the wind.
Have your vehicle winter-proofed at a quali-
fied specialist workshop at the onset of win-
ter.
Drive particularly carefully on slippery road
surfaces. Avoid sudden acceleration, steeringand braking maneuvers. Do not use cruise
control.
If the vehicle threatens to skid or cannot be
stopped when moving at low speed:
XShift the transmission to position N.
The outside temperature indicator is not
designed to serve as an ice-warning device
and is therefore unsuitable for that purpose.
Changes in the outside temperature are dis-
played after a short delay.
Indicated temperatures just above the freez-
ing point do not guarantee that the road sur-
face is free of ice. The road may still be icy,
especially in wooded areas or on bridges. The
vehicle could skid if you fail to adapt your
driving style. Always adapt your driving style
Driving tips179
Driving and parking
Z
and drive at a speed to suit the prevailing
weather conditions.
You should pay special attention to road con-
ditions when temperatures are around freez-
ing point.
For more information on driving with snow
chains, see (
Ypage 571).
For more information on driving with summer
tires, see (
Ypage 570).
Observe the notes in the "Winter operation"
section (
Ypage 570).
Driving systems
Cruise Control
General notes
Cruise control maintains a constant road
speed for you. It brakes automatically in order
to avoid exceeding the set speed. On long and
steep downhill gradients, especially if the
vehicle is laden, you must select a lower gear
in good time. By doing so, you will make use of
the braking effect of the engine. This relieves
the load on the brake system and prevents
the brakes from overheating and wearing too
quickly.
Use cruise control only if road and traffic con-
ditions make it appropriate to maintain a
steady speed for a prolonged period. You can
store any road speed above 20 mph
(30 km/h).
Important safety notes
If you fail to adapt your driving style, cruise
control can neither reduce the risk of an acci-
dent nor override the laws of physics. Cruise
control cannot take into account the road,
traffic and weather conditions. Cruise control
is only an aid. You are responsible for the dis-
tance to the vehicle in front, for vehicle speed,
for braking in good time and for staying in
lane. Do not use cruise control:
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
If there is a change of drivers, advise the new
driver of the speed stored.
Cruise control lever
Cruis econtrol leve r
:
To store the current speed or a higher
speed
;To store the current speed or call up the
last stored speed
=To store the current speed or a lower
speed
?To deactivate cruise control
When you activate cruise control, the stored
speed is shown in the status indicator of the
multifunction display:
RUSA only: e.g. CRUISE 55 Miles
RCanada only: e.g. ¯90 Km/h
180Driving systems
Driving and parking
!If unavoidable, you should drive over
obstacles such as curbs slowly and not at a
sharp angle. Otherwise, you may damage
the wheels or tires.
Active Parking Assist may possibly indicate
parking spaces which are not suitable for
parking, for example:
Rwhere parking or stopping is prohibited
Rin front of driveways or entrances and exits
Ron unsuitable surfaces
Parking tips:
ROn narrow roads, drive as close to the park-
ing space as possible.
RParking spaces that are littered or over-
grown might be identified or measured
incorrectly.
RParking spaces that are partially occupied
by trailer drawbars might not be identified
as such or be measured incorrectly.
RSnowfall or heavy rain may lead to a parking
space being measured inaccurately.
RPay attention to the PARKTRONIC
(
Ypage 200) warning messages during the
parking procedure.
RYou can intervene in the steering procedure
to correct it at any time. Active Parking
Assist will then be canceled.
RWhen transporting a load which protrudes
from your vehicle, you should not use
Active Parking Assist.
RNever use Active Parking Assist when snow
chains are installed.
RMake sure that the tire pressures are
always correct. This has a direct influence
on the parking characteristics of the vehi-
cle.
Parking
Important safety notes
Objects located above the height range of
Active Parking Assist will not be detected
when the parking space is measured. These
are not taken into account when the parking procedure is calculated, e.g. overhanging
loads, tail sections or loading ramps of goods
vehicles. In some circumstances, Active Park-
ing Assist may therefore guide you into the
parking space too early.
GWARNING
If there are objects above the detection range, Active Parking Assist may turn prematurely.
You may cause a collision as a result. There is
a risk of an accident.
If there are objects above the detection range,
stop and deactivate Active Parking Assist.
GWARNING
Active Parking Assist merely aids you by inter- vening actively in the steering. If you do not
brake there is a risk of an accident.
Always apply the brakes yourself when
maneuvering and parking.
Detecting parking spaces
Example: detected parking space
Active Parking Assist is switched on automat-ically when driving forwards. The system is
operational at speeds of up to approximately
22 mph (35 km/h). While in operation, the
system independently locates and measures
parking spaces on both sides of the vehicle.
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.
By default, Active Parking Assist only displays
parking spaces on the front-passenger side.
Parking spaces on the driver's side are dis-
played as soon as the turn signal on the driv-
er's side is activated. If you wish to park in a
Driving systems203
Driving and parking
Z
Activating/deactivating the rear view
camera
XTo activate:makesur ethat th eSmartKey
is in position 2in th eignition lock.
XMak esur ethat th e"Show rear vie wcamera
display" function is selected in COMAND
(
Ypage 319).
XEngage revers egear .
The area behind th evehicl eis shown in th e
COMAND display wit hguide lines.
To deacti vate:therear vie wcamera deacti -
vates if you shif tth etransmission to Por after
driving forwards ashort distance.
Displays in the COMAND display
The rear vie wcamera may sho w adistorted
vie wof obstacles, sho wthem incorrectl yor
no tat all. The rear vie wcamera does no tsho w
objects in th efollowin gpositions:
Rver yclose to th erear bumper
Runder th erear bumper
Rin th earea immediately abov eth etailgat e
handle
!Objects no tat ground level may appear to
be further away than they actually are, e.g. :
Rthebumper of aparked vehicl e
Rthedrawbar of atrailer
Rth eball couplin gof atrailer to whitch
Rtherear section of an HGV
Raslante dpos t
Use th eguidelines only for orientation .
Approach objects no further than th ebot -
tom-mos tguideline.
:Whit eguide lin ewithout turnin gth e steer -
ing wheel, vehicl ewidt hincludin gth e
exterio rmirror s (static)
;Yellowguide lin eat adistanc eof approx -
imately 13 ft (4.0m) from the rear of the
vehicle
=Red guide line for the vehicle width includ-
ing the exterior mirrors, for current steer-
ing wheel angle (dynamic)
?Yellow lane marking tires at current steer-
ing wheel angle (dynamic)
AYellow guide line at a distance of approx-
imately 3 ft (1.0 m) fromthe rear of the
vehicle
BVehicle center axle (marker assistance)
CBumper
DRed guide line at a distance of approx-
imately 10 in (0.25 m) fromthe rear of the
vehicle
The guide lines are shown when the trans-
mission is in position R.
The distance specifications only apply to
objects that are at ground level.
Driving system s207
Driving an d parking
Z
Display messagesPossible causes/consequences andMSolutions
The vehicleis leakin goil.
The multifunction display continuousl yshows th edisplay mes -
sage .
GWARNIN G
The vehicle's suspensio nsetting smay be affected.
There is aris kof an accident.
XPull ove rand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions. Do no tcontinue drivin g
under any circumstances.
XSecur eth evehicl eagainst rollin gaway (Ypage 171).
XNotify aqualified specialist workshop or breakdown service.
Active Body Control (ABC) is malfunctioning.
The multifunction display continuousl yshows th edisplay mes -
sage .
GWARNIN G
The suspensio nsetting sare thus affected.
There is aris kof an accident.
XDo no tdrive at speeds abov e50 mph (80 km/h).
XMak eonly slight steerin gmovements. Otherwise ,th efron t
fender or th etires could be damaged if th esteerin gmovement
is to olarge.
XListe nfo rscraping sounds.
XVisit aqualified specialist workshop .
À
Attention Assist:
Take a Break!
Based on certain criteria, ATTENTION ASSIST has detecte dfatigue
or alac kof concentration on th epart of th edriver . Awarnin gtone
also sounds.
XIf necessary, tak e abreak.
Durin glon gjourneys, tak eregular breaks in goo dtime so you get
enough rest.
À
Attention Assist
Inoperative
ATTENTION ASSIST is inoperative.
XVisit aqualified specialist workshop .
ë
Off
The HOLD function is deactivated. The vehicl eis skidding.
A warnin gtone also sounds.
XReactivat eth eHOLD function later (Ypage 191).
Display messages259
On-board computer and displays
Z
Tires
Display messagesPossible causes/consequences andMSolutions
Please Correct
Tire Pressure
The tire pressure is too low in at least one of the tires, or the tire
pressure difference between the wheels is too great.
XCheck the tire pressures at the next opportunity (Ypage 575).
XIf necessary, correct the tire pressure.
XRestart the tire pressure monitor (Ypage 577).
TirePressureSoonThe tire pressure in one or more tires has dropped significantly.
The wheel position is shown in the multifunction display.
A warning tone also sounds.
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed
increase.
Rthey may wear excessively and/or unevenly, which may greatly
impair tire traction.
Rthe driving characteristics, as well as steering and braking, may
be greatly impaired.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 171).
XCheck the tires and, if necessary, follow the instructions for a
flat tire (
Ypage 550).
XCheck the tire pressure (Ypage 575).
XIf necessary, correct the tire pressure.
264Displa y messages
On-board computer and displays
Display messagesPossible causes/consequences andMSolutions
WarningTir eMal ‐
function
The tire pressur ein on eor mor etires has dropped suddenly. The
whee lposition is shown in th emultifunction display.
GWARNIN G
Drivingwit h a flat tire poses aris kof th efollowing hazards :
Raflat tire affects th eabilit yto steer or brak eth evehicle.
Ryou could los econtrol of th evehicle.
Rcontinued drivin gwit h a flat tire will caus eexcessive heat build-
up and possibl y afire.
There is aris kof an accident.
XStop th evehicl ewithout makin gany sudden steerin gor brakin g
maneuvers .Pay attention to th etraffic condition sas you do so.
XSecur eth evehicl eagainst rollin gaway (Ypage 171).
XCheckth etires and ,if necessary, follow th einstruction sfo r a
flat tire (
Ypage 550).
TirePress. Moni‐
tor Currently
Unavailable
Becaus ethere is interferenc efrom astron gsource of radi owaves,
no signal sfrom th etire pressur esensor sare detected. The tire
pressur emonitor is temporarily malfunctioning.
XDrive on .
The tire pressur emonitor restarts automatically as soo nas th e
problem has been resolved.
TirePress .Sen ‐
sor(s) Missin g
There is no signal from th etire pressur esensor of on eor several
wheels. The pressur eof th eaffecte dtire does no tappea rin th e
multifunction display.
XHav eth efault ytire pressur esensor replaced at aqualified spe -
cialist workshop .
TirePressure Mon ‐
itorInoperative
No Wheel Sensor s
The wheels mounted do no thav e a suitable tire pressur esensor .
The tire pressur emonitor is deactivated.
XMoun twheels wit hsuitable tire pressur esensors.
The tire pressur emonitor is activated automatically after drivin g
fo r a few minutes.
Tir ePress. Moni‐
tor Inoperative
The tire pressur emonitor is faulty.
XVisit aqualified specialist workshop .
Display messages265
On-board computer and displays
Z
Tires
ProblemPossible causes/consequences andMSolutions
h
The yellow combination
low tire pressure tell-
tale/TPMS malfunction
telltale for the TPMS
(pressure loss or mal-
function) is lit.The tire pressure monitor has detected a loss of pressure in at
least one of the tires.
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed
increase.
Rthey may wear excessively and/or unevenly, which may greatly
impair tire traction.
Rthe driving characteristics, as well as steering and braking, may
be greatly impaired.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 171).
XObserve the additional display messages in the multifunction
display.
XCheck the tires and, if necessary, follow the instructions for a
flat tire (
Ypage 550).
XCheck the tire pressure (Ypage 575).
XIf necessary, correct the tire pressure.
h
The yellow combination
low tire pressure tell-
tale/TPMS malfunctiontelltale for the TPMS
(pressure loss or mal-
function) flashes for
approximately one
minute and then
remains lit.The tire pressure monitor is faulty.
GWARNING
The system is possibly unable to recognize or register low tire
pressure.
There is a risk of an accident.
XObserve the additional display messages in the multifunction
display.
XVisit a qualified specialist workshop.
Warning and indicator lamps281
On-board computer and displays
Z