
Loading a trailer
!Utilize the maximum permissible nose-
weight as fully as possible. Do not allow the
weight to fall below the minimum permissible
noseweight, otherwise the trailer may come
loose.
RThe load must be distributed over the vehicle
and the trailer so as not to exceed either the
maximum permissible values for the gross
vehicle weight rating (GVWR) and gross trailer weight (GTW), the gross combination weight
rating (GCWR), nor the maximum permissible
gross axle weight rating (GAWR) and trailer
drawbar noseweight rating of your vehicle.
RAdd the drawbar noseweight on the ball cou-
pling (TWR) to the rear axle load. This will pre-
vent you from exceeding the permissible
gross axle weight (GAWR).
RAdd the drawbar noseweight on the ball cou-
pling (TWR) to the vehicle payload. This will
ensure that you do not exceed the permissi-
ble gross vehicle weight rating (GVWR).
Checking the vehicle and trailer weight
RMake sure the weights of the towing vehicle
and the trailer comply with the maximum per-missible values. Have the vehicle/trailer com-
bination weighed on a calibrated weigh-
bridge. The vehicle/trailer combination con-
sists of the towing vehicle including the driver,
passengers and load, as well as the loaded
trailer.
RCheck the maximum permissible gross axle
weight rating of the front and rear axles
(GAWR), the gross trailer weight (GTW), the
gross combination weight rating (GCWR) and
the noseweight of the trailer drawbar (TWR).
Trailer power supply
!
Incorrect wiring of the connector plug could,
under certain circumstances, cause malfunc-
tions in the vehicle's other electronic sys-
tems. We therefore recommend having the
connector plug wired at a qualified specialist
workshop.
!You can connect accessories with a maxi-
mum power consumption of 240 W to the
permanent power supply. You must not charge a trailer battery using the
power supply.
Your vehicle may be equipped with various elec-
trical installations for trailer towing. Depending
on your trailer, you may need an adapter to con-
nect the electrical system of the trailer with that
of the vehicle.
The trailer socket of your vehicle is equipped at
the factory with a permanent power supply.
The permanent power supply is on the trailer
socket pin assignment 4.
Note that the permanent power supply of the
trailer is not switched off when the on-board
voltage is low. This can completely discharge
the starter battery of your vehicle.
Further information on the electrical equipment
currently installed on your vehicle and on instal-
ling trailer electrics can be obtained at any quali-
fied specialist workshop.
Towing a trailer157
Driving and parking
Z

Display messages on vehicles withsteering wheel buttons
Safet ysystems
Display messagesPossible causes/consequences an dMSolutions
ABS
Visit workshop
AB Shas bee ndeactivated due to amalfunction .ES P®,AS Rand BAS,
as well as cruise control, hav ealso bee ndeactivated as aresult .
GWARNING
The brake syste mcontinues to function normally, but without th e
function slisted above. The wheels could therefore loc kif you brake
hard, fo rexample.
Thi scauses steerability and braking to be greatly impaired. The brak-
in gdistanc ecan increase in emergency braking situations. The driven
wheels can spi nwhen accelerating.
If ES P
®is no toperational, ES P®will notstabilize th evehicle.
There is an increase dris kof skidding and accidents .
XDrive on withcare.
XVisit aqualified specialis tworkshop immediately.
ABS
Unavailable
AB Sis temporarily unavailable or is deactivated due to undervoltage.
ES P®,AS Rand BAS, as well as cruise control, are also unavailable as
a result .
The battery may no tbe bein gcharged.
GWARNING
The brake syste mcontinues to function normally, but without th e
function slisted above. The wheels could therefore loc kif you brake
hard, fo rexample.
Thi scauses steerability and braking to be greatly impaired. The brak-
in gdistanc ecan increase in emergency braking situations. The driven
wheels can spi nwhen accelerating.
If ES P
®is no toperational, ES P®will notstabilize th evehicle.
There is an increase dris kof skidding and accidents .
XDrive for ashort distanc eat aspeed of more than 13 mph
(20 km/h).
If th edisplay messag edisappears ,th efunction smentioned abov e
are available again .
If th edisplay messag econtinues to be displayed:
XDrive on wit hcare.
XVisit aqualified specialis tworkshop immediately.
178Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
:
Visit workshop
ASRhas been deactivated due to amalfunction .
The engin epowe routput may be reduced.
GWARNIN G
The driven wheels can spin when accelerating .
There is an increased ris kof skiddin gand accidents .
XDrive on withcare.
XVisit aqualified specialist workshop immediately.
:
Visit workshop
BA Shas been deactivated due to amalfunction .
GWARNING
The brak esystem continues to function normally, but without elec -
tronic support .
The braking distanc ecan increas ein emergenc ybraking situations.
There is aris kof an accident.
XDrive on wit hcare.
XVisit aqualified specialist workshop immediately.
:
Unavailable
AS Rand BA Shav ebeen deactivated due to undervoltage.
The battery may no tbe bein gcharged.
GWARNIN G
The brak esystem continues to function normally, but without th e
function slisted above. The wheels could therefor eloc kif you brak e
hard, for example.
The braking distanc ecan increas ein emergenc ybraking situations.
The driven wheels can spin when accelerating .
There is an increased ris kof skiddin gand accidents .
XDrive on withcare.
XVisit aqualified specialist workshop immediately.
#
Brake wea rVisitworkshop
The brak epads/linings hav ereached their wear limit.
XHav eth ebrak epads/linings replace das soo nas possibl eat a
qualified specialist workshop .
Display messages179
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
b
Brake fluid Visitworkshop
There is insufficientbrak eflui din th efluid reservoir .
GWARNING
Braking performance can be impaired.
There is aris kof an accident.
XStop th evehicl eas soo nas possible, payin gattention to roa dand
traffic conditions.
XChec kth ebrak efluid level in th ebrak efluid reservoir
(Ypage 219).
If th ebrak eflui dis belo wtheMIN mark:
XDo no tcontinu edrivin gunder any circumstances.
XDo no tadd brak efluid .This does no tsolv eth eproblem .
XConsult aqualified specialist workshop .
If th ebrak eflui dis abov eth eMIN mark:
XDrive on wit hcare.
XVisit aqualified specialist workshop immediately.
b
Brake force distri ‐bution
EBDhas been deactivated due to undervoltage.
The battery may no tbe bein gcharged.
GWARNIN G
The rear wheels could loc kwhen you apply th ebrakes. The braking
distanc ecan increas ein emergenc ybraking situations.
There is an increased ris kof skiddin gand accidents .
XStop thevehicl eas soo nas possible, payin gattention to roa dand
traffic conditions.
XDo no tdrive on .
XConsult aqualified specialist workshop .
b
Brake force distri‐bution Visit work‐shop
EBDhas been deactivated due to amalfunction .
GWARNING
The rear wheels could loc kwhen you apply th ebrakes. The braking
distanc ecan increas ein emergenc ybraking situations.
There is an increased ris kof skiddin gand accidents .
XStop thevehicl eas soo nas possible, payin gattention to roa dand
traffic conditions.
XDo no tdrive on .
XConsult aqualified specialist workshop .
180Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
ESP
Visit workshop
ESP®has been deactivated due to amalfunction .As aresult ,cruise
control has also been deactivated.
Engin epowe routput may be reduced.
GWARNIN G
If ES P
®is no toperational, ES P®will notstabiliz eth evehicle.
There is an increased ris kof skiddin gand accidents .
XDrive on withcare.
XVisit aqualified specialist workshop immediately.
ESP
Unavailable
ES P®has been deactivated due to undervoltage. As aresult ,cruise
control has also been deactivated.
The battery may no tbe bein gcharged.
GWARNIN G
If ES P
®is no toperational, ES P®will notstabiliz eth evehicle.
There is an increased ris kof skiddin gand accidents .
XDrive on withcare.
XConsult aqualified specialized workshop as soo nas possible.
c
Parkin gbrakeReleas ebrake
Additionally, awarning tone sounds.
You are drivin gwit hth eparking brak eapplied.
XReleas eth eparking brak e (Ypage 128).
7
Seatbeltsys.Visitworkshop
The belt system has malfunctioned.
GWARNIN G
In th eevent of an acciden tor arapi ddeceleration ,th eseat belt seither
canno tprotect you as intended.
There is aris kof injury.
XConsult aqualified specialized workshop as soo nas possible.
6
Restraint systemVisit workshop
The restrain tsystem is faulty.
GWARNIN G
If th erestrain tsystem is malfunctioning ,individual systems could be
triggered inadvertentl yor might no tbe triggered at all in th eevent of
an accident.
There is an increased ris kof injury and accidents .
XDrive on withcare.
XVisit aqualified specialist workshop immediately.
Display messages18 1
On-board computer and displays
Z

Vehicle
Display messagesPossible causes/consequences andMSolutions
Ð
SteeringAssistanceFailure
The power assistance for the steering has malfunctioned. You need to
steer more forcefully.
XCarefully continue to a qualified specialist workshop and have the
steering checked immediately.
#
Battery/AlternatorVisit workshop
The battery is not being charged. Possible causes are a defective
alternator or a torn poly-V-belt.
XStop the vehicle as soon as possible, paying attention to road and
traffic conditions.
XCheck the poly-V-belt.
XIf the poly-V-belt is torn: do not continue driving. Consult a qualified
specialist workshop.
XIf the poly-V-belt is not damaged: have the vehicle checked as soon
as possible by a qualified specialist workshop.
÷
Electrically oper‐ated step
The electrical step has retracted or extended only partially or not at all.
XMake sure there is sufficient free space for the electrical step.
XOpen or close the sliding door again.
XIf the electrical step still does not extend or retract fully, push the
step in manually (Ypage 66). Before stepping out, remind the pas-
sengers that the step is missing.
1
Hood open
You are already driving at walking pace, even though the hood is not
closed.
XClose the hood.
9
Please enter PIN:
You have not yet entered your PIN in the mobile phone.
XEnter the PIN for the SIM card.
1
Doors open
You are already driving at walking pace, even though not all the doors
are closed.
XClose the doors.
¦
Washer fluid Checklevel
The washer fluid level is too low.
XAdd washer fluid (Ypage 220).
Key
Display messagesPossible causes/consequences and MSolutions
+
Replace key Visitworkshop
The key is no longer working.
XVisit a qualified specialist workshop.
Display messages189
On-board computer and displays
Z

ProblemPossible causes/consequences andMSolutions
d
The yellow
ASR/ESP®warn-
ing lamp is lit
while the engine
is running.
The all-wheel drive is activated/deactivated. When changing gear,
ASR and ESP®are deactivated.
After changing gear, ASR and ESP®are automatically reactivated.
Engage/disengage the all-wheel drive (
Ypage 145).
d The yellow
ASR/ESP®warn-
ing lamp flashes
slowly while the
vehicle is in
motion.
In vehicles with all-wheel drive the brake system is overheated.
GWARNING
The performance of 4ETS is reduced. The braking power output may
be lower.
There is a risk of an accident.
XDrive on carefully and adapt your driving style to suit the road and
traffic conditions.
XWhen the message is no longer displayed, 4ETS and normal braking
power are available again.
d The yellow
ASR/ESP®warn-
ing lamp is lit
while the engine
is running.
ASR is deactivated.
GWARNING
The driven wheels can spin when accelerating.
There is an increased risk of skidding and accidents.
XActivate ASR again. Exceptions (Ypage 54).
h !:b
The yellow ESP®, ABS
and ASR/BAS indicator
lamps and the red brake
system indicator lamp
are lit while the engine is
running.
EBD is malfunctioning or deactivated due to undervoltage or malfunc-
tion.
The battery may not be being charged.
GWARNING
The rear wheels could lock sooner than expected when you apply the
brakes. The braking distance can increase in emergency braking sit-
uations.
There is an increased risk of skidding and accidents.
XVehicles with steering wheel buttons: also observe the messages in
the display (Ypage 173).
XStop the vehicle as soon as possible, paying attention to road and
traffic conditions.
XDo not drive on.
XConsult a qualified specialist workshop.
Indicator and warning lamps in the instrument cluster191
On-board computer and displays
Z

ProblemPossible causes/consequences andMSolutions
:
The yellow
ASR/BAS indica-
tor lamp is lit
while the engine
is running.ASR and BAS have been deactivated due to undervoltage.
The battery may not be being charged.
GWARNING
The brake system is still available with the normal braking effect.
The driven wheels can spin when accelerating.
The braking distance can increase in emergency braking situations.
There is an increased risk of skidding and accidents.
XDrive on with care.
XVisit a qualified specialist workshop immediately.
! The yellow ABS
indicator lamp is
lit while the
engine is running.ABS is deactivated due to a malfunction or is temporarily unavailable.
ESP®, ASR and BAS, as well as cruise control, are also unavailable as
a result.
Self-diagnosis may not be complete, or the battery may not be charg-
ing.
GWARNING
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock, e.g. if the
brakes are applied with maximum force.
This causes steerability and braking to be greatly impaired.
The braking distance can increase in emergency braking situations.
The driven wheels can spin when accelerating.
If ESP
®is not operational, ESP®will not stabilize the vehicle.
There is an increased risk of skidding and accidents.
XDrive a short distance at a speed above 13 mph (20 km/h).
The functions mentioned above are available again when the indi-
cator lamp goes out.
If the indicator lamp does not go out:
XDrive on with care.
XVisit a qualified specialist workshop immediately.
å The yellow DEF
indicator lamp is
lit while the
engine is running.The exhaust gas aftertreatment is malfunctioning or the current Diesel
Exhaust Fluid (DEF) supply is limiting the range.
XObserve the messages in the display.
Indicator and warning lamps in the instrument cluster193
On-board computer and displays
Z