Most federal states and all Canadian provinces
require by law:
Rsafety chains between the towing vehicle andthe trailer. The chains should be cross-wound
under the trailer drawbar. They must be fas-
tened to the vehicle's trailer coupling, not to
the bumper or the axle.
Leave enough slack in the chains. This allows you to drive round tight corners.
Ra separate brake system for certain types of
trailer.
Ra safety shut-off for braked trailers. Find out
the specific requirements according to the
applicable laws.
If the trailer becomes detached from the tow-
ing vehicle, the safety feature applies the
trailer brakes.
Towing a trailer
There are numerous legal requirements con-
cerning the towing of a trailer, e.g. speed restric-tions. Make sure your vehicle/trailer combina-
tion complies with local laws. This not only
means where you live, but also anywhere you
are driving to. Information is available from the
police and local authorities.
Observe the following when towing a trailer:
RPractice driving around bends, stopping and
backing up at a place where there is no traffic.
This enables you to gain experience and get
used to the new handling characteristics.
RBefore driving, check:
-that the trailer tow hitch and ball coupling
are secure
-that the safety switch for a braked trailer is
functioning properly
-that the safety chains are secure and not
damaged
-that the electrical connections are secure
-that the lights are working
-that the wheels are in good order and the
tire pressure is correct
RAdjust the exterior mirrors to provide an
unobstructed view of the rear section of the
trailer.
RIf the trailer has electronically controlled
brakes, pull the vehicle/trailer combination
away carefully. Brake manually using the
brake controller and check that the brakes
are working.
RSecure the load on the trailer according to the
applicable specifications and current stand-
ards on securing loads (
Ypage 214).
RWhen driving with a trailer, check at regular
intervals that the load is secured and that the
brakes and lights are working.
RBear in mind that the handling will be less
stable when towing a trailer than when driving
without one. Avoid sudden steering move-
ments.
RThe vehicle/trailer combination is heavier,
accelerates more slowly and has a decreased
gradient climbing capability and a longer
braking distance.
It is more susceptible to crosswinds and
requires cautious steering.
RIf possible, do not brake suddenly, but rather
moderately at first so that the trailer can acti-
vate its brakes. Then increase the force on the
brake pedal.
RIf the automatic transmission repeatedly
shifts between gears when driving on inclines,
restrict the shift range. Select shift range 4,3,
2 or 1.
Driving in a low gear and at a low speed
reduces the risk of damaging the engine.
RWhen driving on a downhill gradient, shift to a
low gear and take advantage of the engine's
braking effect.
Avoid continuous brake application as this
may overheat the vehicle brakes and, if inst
al-
led, the trailer brakes.
RIf the coolant temperature increases dramat-
ically while the air-conditioning system is
switched on, switch off the air-conditioning
system.
Coolant heat can also be dissipated by
switching the airflow and the temperature of
the heater/air conditioning to the maximum
level. Open the windows if necessary.
RWhen overtaking, pay particular attention to
the extended length of your vehicle/trailer
combination.
Due to the length of your vehicle/trailer com- bination you need an additional distance
before you can return to your original lane.
158Towing a trailer
Driving and parking
Useful information
This Operator's Manual describes all models as
well as standard and optional equipment of your
vehicle that were available at the time of going
to print. Country-specific variations are possi-
ble. Note that your vehicle may not be equipped
with all of the described functions. This also
applies to systems and functions relevant to
safety.
Read the information on qualified specialist
workshops (
Ypage 26).
Important safety notes
GWARNING
If you are driving and reach through the steer- ing wheel to operate the adjustment knob,
you could lose control of the vehicle. There is
a risk of an accident and injury.
Only operate the adjustment knobs when thevehicle is stationary. Do not reach through the
steering wheel when driving.
GWARNING
If you operate information systems and com-
munication equipment integrated in the vehi-
cle while driving, you will be distracted from
traffic conditions. You could also lose control
of the vehicle. There is a risk of an accident.
Only operate the equipment when the traffic
situation permits. If you are not sure that this
is possible, park the vehicle paying attention
to traffic conditions and operate the equip-
ment when the vehicle is stationary.
GWARNING
If the instrument cluster has failed or mal-
functioned, you may not recognize function
restrictions in systems relevant to safety. The
operating safety of your vehicle may be
impaired. There is a risk of an accident.
Drive on carefully. Have the vehicle checked
at a qualified specialist workshop immedi-
ately. You must observe the legal requirements for the
country in which you are currently driving when
operating the on-board computer.
The on-board computer display only shows mes-
sages and warnings from certain systems. You
should therefore make sure your vehicle is oper-
ating safely at all times. If the operating safety of
your vehicle is impaired, stop the vehicle as
soon as possible, paying attention to road and
traffic conditions. Then consult a qualified spe-
cialist workshop.
Instrument cluster
Overview
:Instrument cluster on vehicles without
steering wheel buttons
;Instrument cluster in vehicles with steering-
wheel buttons
=Adjustment buttons fand g
?Reset button 9
AService button Ë(engine oil level check)
BMenu button 4
You will find a full overview of the instrument
cluster in the "At a glance" section (
Ypage 32).
The display in the instrument cluster is activated when you:
Ropen the driver's door
Rturn the key to position 2in the ignition lock
Rpress the 9reset button
Rswitch on the lights
Instrument cluster161
On-board computer and displays
Z
If the supply of DEF falls below the reserve range
of 0.8 US gal (3.0l), the StArtS RExxmessage
appears in the display. In addition, the yellow
å DEF indicator lamp lights up in the instru-
ment cluster and three warning tones sound.
In the display, xx
corresponds to the number of
possible remaining engine starts (16to 0).
When the display shows that the number of
remaining starts is 0
, theStArtSIdLEmessage
appears in the display and three warning tones
sound.
In addition, the yellow åDEF indicator lamp
and the ;Check Engine indicator lamp light
up in the instrument cluster and three warning
tones sound.
The engine management only allows speeds of
up to 5 mph (8 km/h).
Add at least 1.5 US gal (5.5 l) of DEF
(
Ypage 129).
The display message only disappears when the
vehicle is stationary, at the latest after
20 seconds as soon as you switch on the ignition or start the engine after refueling.
Vehicles with steering wheel buttons
If the supply of DEF is less than 1.5 US gal
(5.5 l), the Check Diesel Exhaust Fluid
see Operator's Manualmessage appears in
the display.
If the supply of DEF falls below the reserve range
of 0.8 US gal (3.0 l), the XX
startsremainingmessage is displayed.
Three short warning tones also sound.
In the display,xx
corresponds to the number of
possible remaining engine starts (16to 0).
When the display shows that the number of
remaining starts is 0
, theStArtSIdLEmessage
appears in the display.
The yellow ;Check Engine indicator lamp
also lights up and three short warning tones
sound.
The engine management only allows speeds of
up to 5 mph (8 km/h).
Add at least 1.5 US gal (5.5 l) of DEF
(
Ypage 129).
The display message only disappears when the
vehicle is stationary, at the latest after
20 seconds as soon as you switch on the ignition or start the engine after refueling.
On-board computer (vehicles without
steering wheel buttons)
Operating the on-board computer
General notes
The on-board computer is activated as soon as
you turn the key to position 1in the ignition lock.
The on-board computer shows vehicle informa-
tion and settings in the display.
You can control the display and the settings in
the on-board computer using the adjustment
buttons on the instrument cluster.
Standard display
:Odometer
;Trip odometer
=Clock
?Outside temperature or digital speedometer
AFuel gage (Ypage 162)
BSelector lever position or current shift range
with automatic transmission (Ypage 124)
XTo call up the standard display: turn the key
to position 2in the ignition lock.
XPress the 4menu button for longer than
1 second.
The information shown in the display changes
from the outside temperature to the digital
speedometer.
Menus in the on-board computer
Overview
If you wish to exit a menu and go to the standard display:
XPress the 4menu button for longer than
1 second.
or
XDo not press any button for 10 seconds.
The display accepts the changed settings.
On-board computer (vehicles without steering wheel buttons)163
On-board computer and displays
Z
Using thef,g,4or9 adjustment buttons,
you can select the following functions:
RCalling up the service due date
(Ypage 226)
RChecking the oil level (Ypage 220)
RChecking the DEF supply (Ypage 162)
RPreselecting/setting the auxiliary heating
switch-on time (Ypage 108)
RTire pressure monitor (Ypage 253)
RSetting the time (Ypage 164)
RActivating/deactivating Highbeam Assist
(Ypage 171)
RSetting the daytime running lamps
(Ypage 79)
Setting the time
XTurn the key to position 2in the ignition lock.
XPress the 4menu button repeatedly until the
hours figure flashes.
XPress the forg button to set the hour.
XPress the 9reset button.
The minute display flashes.
XPress the forg button to set the minute.
iIf you keep the forg button pressed, the
value will change continuously.
Activating/deactivating Highbeam
Assist
XTurn the key to position 2in the ignition lock.
XPress the 4menu button repeatedly until the
_ indicator lamp flashes and the onorOFFmessage appears in the display.
XUse the forg button to switch Highbeam
Assist on/off.
Switching the daytime running lamps
on/off
If you switch the daytime running lamps on, the
daytime running lamps will automatically light
up when the engine is running.
For safety reasons, it is only possible to change
this setting when the vehicle is stationary. The
factory setting is on
in countries in which day-
time running lamp mode or daytime running
lamps are mandatory.
XTurn the key to position 2in the ignition lock.
XPress the 4menu button repeatedly until the
L indicator lamp flashes and the onorOFFmessage appears in the display.
XPress the forg button to activate or deac-
tivate the daytime running lamps.
iUSA only:
If you turn the light switch to TorL,
the corresponding light switches on. If you
turn the light switch to Ã, the daytime
running lamps remain switched on.
Canada only:
If you turn the light switch to L, the low-
beam headlamps switch on. If you turn the
light switch to TorÃ, the daytime run-
ning lamps remain switched on.
On-board computer (vehicles with
steering wheel buttons)
Operating the on-board computer
Overview
XTo activate the on-board computer: turn
the key to position 1in the ignition lock.
The on-board computer shows vehicle informa-
tion and settings in the display.
You can control the display and the settings in
the on-board computer with the buttons on the
steering wheel.
164On-board computer (vehicles with steering wheel buttons)
On-board computer and displays
Menu overview
Diagrams
This is what the displays look like when you scroll through the menus.
Generic terms
The illustration shows the menus on a vehicle
with Audio 15.
On Sound 5/Audio 20, the on-board computer
always shows the AUDIOandTEL (telephone)
menus in English. This is the case even if a dif-
ferent language is selected for the display.
Operation
:Operation menu (Ypage 166)
RStandard display
RCalling up the service due date
(Ypage 226)
RTire pressure monitor (Ypage 253)
RChecking the engine oil level
(Ypage 220)
;Audio menu (Ypage 167)
=Message memory menu (Ypage 176)
?Settings menu (Ypage 168)
ATrip computer menu (Ypage 174)
BTelephone menu (Ypage 175)
iThe generic terms in the tabular overview
should make orientation easier for you. How-
ever, they are not always shown on the dis-
play.
Operation menu
Overview
You can select the following functions in the
Operation menu by pressing the 9or:
button on the steering wheel:
RDisplaying the trip odometer and odometer
(standard display) (Ypage 167)
RDisplaying the coolant temperature
(Ypage 167)
RCalling up the service due date
(Ypage 226)
RTire pressure monitor (Ypage 253)
RChecking the oil level (Ypage 220)
166On-board computer (vehicles with steering wheel buttons)
On-board computer and displays
Display messages on vehicles withoutsteering wheel buttons
Display messagesPossible causes/consequences an dMSolutions
_ _ _
V
The activation condition sfo rcruise contro lhav eno tbee nmet .
You can only activat ecruise contro lfrom speeds of 20 mph
(30 km/h).
or
Cruise contro lhas bee ndeactivated due to amalfunction .
XHavecruise contro lchecke dat aqualified specialis tworkshop .
NO TPMSTheNOmessag eis displaye dfo r30 seconds. The TPMSmessag eis also
displaye dafter 30 seconds.
The tire pressure monito rhas malfunctioned.
XHav eth etire pressure monito rand th ewheels checke dat aquali-
fie dspecialis tworkshop .
NO TPMSTheNOmessag eis displaye dfo r30 seconds. The TPMSmessag eis also
displaye dafter 30 seconds.
The tire pressure monito ris no treceivin gsignal sfrom on eor more
wheels because :
Rawhee lhas bee nreplaced wit hth espar ewhee lwithout whee l
electronics.
Rth emaximum temperature on on eof th ewhee lelectronic sunits has
bee nexceeded.
Rth ewhee lelectronic sare malfunctioning.
XHav ewheels wit hsuitable whee lelectronic sunits installed at a
qualified specialis tworkshop .
— —TPMSThe — —messag eis displaye dfo r30 seconds. The TPMSmessag eis
also displaye dafter 30 seconds.
The pressure is insufficien tin on eor more tires ,or th epressures of th e
individual tires diffe rsignificantly.
XChec kth etire pressure and correc tit if necessary (Ypage 253).
dEF ChkIn addition,th eyello wå DEFindicator lamp lights up in th einstru-
men tcluster and awarnin gtone sounds.
The DE Fsupply has dropped belo w1.5US gal (5.5l).
XAdd DEF supply (Ypage 129).
The å DEF indicator lamp only disappears when the vehicle is
stationary, at the latest after 20 secondsa s soon as you switch on
the ignition or start the engine after refueling.
In addition, the yellow ;Check Engine indicator lamp and the yel-
low å DEF indicator lamp light up in the instrument cluster and a
warning tone sounds.
The DEF reducing agent is contaminated, diluted or is not compliant
with ISO 22241.
XHave the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible.
178Display messages
On-board computer and displays
Display messagesPossible causes/consequences andMSolutions
StArtS RExxIn addition,th eyellow åDEFindicator lamp lights up and awarning
tone sequence sounds.
The DE Fsupply has dropped belo wthe0. 8US gal (3. 0l) reserv emark.
Afte rth emessage appear sfor th efirst time, th eremaining DE Fsupply
will last for approximately 1200 mile s(1900 km). The engin ecan then
only be started another 16 times .
The number of remaining engin estart sXX
(16to 1)is shown in th e
message every time th eengin eis started.
XAd dat least 1. 5US gal (5. 5l) of DE F (Ypage 129).
The å DEFindicator lamp disappear safter no mor ethan
20 seconds after th evehicl ehas stoppe dor you hav eswitched on
th eignition or started th eengin eafter refueling.
In addition ,th eyellow ;CheckEngin eindicator lamp and th eyel-
low å DEFindicator lamp ligh tup in th einstrumen tcluste rand
three short warning tone ssound.
The DE Freducin gagen tis contaminated, diluted or is no tcomplian t
wit hIS O 2224 1.
The exhaust gas aftertreatment is malfunctioning or an emission rel-
evant malfunction has occurred. This malfunction or defect can dam- age the exhaust gas aftertreatment.
XVisit a qualified specialist workshop immediately.
¯
StArtS IdLE
In addition, the yellow åDEF indicator lamp and the ;Check
Engine indicator lamp light up in the instrument cluster and three
warning tones sound.
If the StArtS
IdLEmessage is displayed, you cannot drive the vehicle
at a speed exceeding 5 mph (8 km/h).
XAdd at least 1.5 US gal (5.5 l) of DEF (Ypage 129).
The å DEF indicator lamp disappears after no more than
20 seconds after the vehicle has stopped or you have switched on the ignition or started the engine after refueling.
In addition, the yellow ;Check Engine indicator lamp and the yel-
low å DEF indicator lamp light up in the instrument cluster and a
warning tone sounds.
You cannot drive the vehicle at a speed exceeding 5 mph (8 km/h).
XVisit a qualified specialist workshop immediately.
Display messages179
On-board computer and displays
Z
Display messagesPossible causes/consequences andMSolutions
Highbeam AssistinoperativeHighbeamAssis tis faulty.
XVisit aqualified specialist workshop .
HighbeamAssisttem‐porarily unavaila‐ble
Highbea mAssis tis deactivated and temporarily inoperative.
Possibl ecauses are:
RThe camera' sfunctionalit yis impaire ddue to heav yrain ,snow or
fog .
RThe windshield is dirty in th ecamera' sfield of vision .
XStop thevehicl epayin gattention to roa dand traffic conditions.
XSecur eth evehicl eto preven tit from rollin gaway (Ypage 130).
XClean th ewindshield (Ypage 235), particularly in th ecamera' s
field of vision .
If th emalfunction has been rectified, th eHighbeam Assist
available againmessage appears.
Engine
Display messagesPossible causes/consequences and MSolutions
ExhaustFilter :
Drive at hig hengine speed. SeeOper. Manual
The automatic regeneration of th ediesel particl efilter is no tsufficien t
or has malfunctioned.
XDrive at an engin espeed of abov e2000 rpm until th edisplay mes -
sage disappears.
If th edisplay message does no tgo out after approximately
20 minutes, hav eth emalfunction rectifie dimmediately at aquali-
fie dspecialist workshop .
Check DieselExhaustFluid SeeOperator' sManual
The DE Fsupply has dropped belo w1.5US gal (5. 5l).
XAd dDE Fsupply (Ypage 129).
The display message only disappear swhen th evehicl eis stationary,
at th elatest after 20 seconds as soo nas you switch on th eignition
or start th eengin eafter refueling.
å
XX starts remaining
Three short warning tone salso sound.
Afte rth emessage appear sfor th efirst time, th eremaining DE Fsupply
will last for approximately 1200 mile s(1900 km). The engin ecan then
only be started another 16 times .
The number of remaining engin estart sxx
(16to 0)is shown in th e
message every time th eengin eis started.
XAd dat least 1. 5US gal (5.5l)of DEF (Ypage 129).
Display messages187
On-board computer and displays
Z