Page 193 of 290

Display messagesPossible causes/consequences andMSolutions
Blind SpotAssistInoperativeBlind Spot Assis tis faulty.
XHav eBlind Spot Assis tchecke dat aqualified specialist workshop .
Collision Preven‐tionAssist Inoper ‐ative
COLLISION PREVENTION ASSIST is faulty.
XHaveCOLLISION PREVENTION ASSIST checke dat aqualified spe -
cialist workshop .
Recognition by th eradar sensor system can be impaire din th ecas eof:
Rdir ton th esensor sor anythin gelse covering th esensor s
Rsnow or heav yrain
Rinterferenc efrom other radar source s
Rthere are strongradar reflections, for exampl ein parking garages
Ranarrow vehicl etraveling in front, e.g. amotorbik e
Ravehicl etraveling in fron ton adifferen tlin e
XClean th eradar sensor system area .
Intervention Cross‐windAssistThe d indicator lamp also flashes in th einstrumen tcluster.
Crosswin dAssis thas intervened perceptibly.
Tires
Display messagesPossible causes/consequences and MSolutions
Tirepres. Adjustpres.
O
The pressur eis insufficien tin on eor mor etires ,or th epressures of th e
individual tires differ significantly.
XChec kth etire pressur eat th enext opportunity and correc tit if
necessar y (Ypage 253).
Tirepres.
monito rinoperative
The tire pressur emonitor has malfunctioned.
XHav eth etire pressur emonitor and th ewheels checke dat aquali-
fie dspecialist workshop .
Tirepres.
monito rcurrentlyunavailable
The tire pressur emonitor function is temporarily unavailable due to
radi ointerferenc eor undervoltage.
XOnce th ecauses hav ebeen remedied, th etire pressur emonitor is
automatically activated.
Tir epres.-
monito rinoperativeNo wheel sensor s
The tire pressuremonitor is no treceiving signals from on eor mor e
wheels because:
Ra whee lhas been replace dwit hth espar ewhee lwithout whee l
electronics .
Rthemaximum temperature on on eof th ewhee lelectronics units has
been exceeded .
Rthewhee lelectronics are malfunctioning .
XHaveth etire pressur emonitor and th ewheels checke dat aquali-
fie dspecialist workshop .
Display messages191
On-board computer and displays
Z
Page 194 of 290

Display messagesPossible causes/consequences andMSolutions
Check tire(s)
O
The pressureof on eor mor etires has dropped significantly. If th etire
pressur emonitor has detecte dth eaffecte dwheel, th ewhee lposition
is also displayed.
XStop th evehicl eas soo nas possible, payin gattention to roa dand
traffic conditions.
XChec kth etires .
XRepair or chang eth ewhee lif necessar y (Ypage 266).
XCheckth etire pressur eand correc tit if necessar y (Ypage 253).
The display message disappear sautomatically after drivin gfor a
few minute swit hth ecorrecte dtire pressure.
Warnin gTir edefect
O
On eor mor etires is losing air rapidly. If th etire pressur emonitor has
detecte dth eaffecte dwheel, th ewhee lposition is also displayed.
XStop th evehicl ewithout making any sudden steering or braking
maneuvers ,payin gattention to th etraffic condition sas you do so.
XRepair or chang eth ewhee l (Ypage 266).
Vehicle
Display messagesPossible causes/consequences and MSolutions
Ð
SteeringAssistanceFailure
The powe rassistanc efor th esteering has malfunctioned. You need to
steer mor eforcefully.
XCarefully continu eto aqualified specialist workshop and hav eth e
steering checke dimmediately.
#
Battery/AlternatorVisit workshop
The battery is no tbein gcharged. Possibl ecauses are adefective
alternato ror atorn poly-V-belt .
XStop thevehicl eas soo nas possible, payin gattention to roa dand
traffic conditions.
XChec kth epoly-V-belt .
XIf thepoly-V-belt is torn :do no tcontinu edriving. Consult aqualified
specialist workshop .
XIf thepoly-V-belt is no tdamaged: hav eth evehicl echecke das soo n
as possibl eby aqualified specialist workshop .
÷
Electrically oper‐atedste p
The electrical step has retracte dor extended only partially or no tat all.
XMak esur ethere is sufficien tfree spac efor th eelectrical step.
XOpe nor close th esliding door again .
XIf theelectrical step still does no textend or retrac tfully, push th e
step in manually (Ypage 67). Beforestepping out ,remind th epas-
senger sthat th estep is missing.
1
Hoo dope n
You are already drivin gat walking pace, eve nthough th ehoo dis no t
closed .
XCloseth ehood.
192Display messages
On-board computer and displays
Page 195 of 290

Display messagesPossible causes/consequences andMSolutions
9
Please enter PIN:
You haveno tyet entered your PIN in th emobile phone .
XEnterth ePIN for th eSI M card.
1
Doors ope n
You are already drivin gat walking pace, eve nthough no tall th edoor s
are closed .
XCloseth edoors.
¦
Washer fluid Checklevel
The washer flui dlevel is to olow.
XAd dwasher flui d (Ypage 224).
Key
Display messagesPossible causes/consequences and MSolutions
+
Replacekey Visitworkshop
The ke yis no longer working .
XVisitaqualified specialist workshop .
Indicatorand warning lamps in the instrume nt cluster
Whenswitching on th eignition ,som esystems carry out aself-test .Some indicator and warning
lamp smay temporarily tur non or start to flash. This is no tan indication of any problem .Only when
these indicator and warning lights tur non or start flashin gafter th eengin ehas started or during th e
journey has amalfunction occurred .
ProblemPossible causes/consequences and MSolutions
·
The red distanc e
warning lamp
lights up while th e
vehicl eis in
motion .The distanc eto th evehicl ein fron tis to osmall for th espeed selected.
Increase th edistance.
·
The red distanc e
warning lamp
flashes while th e
vehicl eis in
motion .Addition -
ally, an intermit -
tent warning tone
sounds.You are approachin g avehicl eahead at to ohigh aspeed.
XBe prepare dto brak eimmediately.
XPay particular attention to th etraffic situation .You may hav eto
brak eor tak eevasive action .
Ã
The yello wLan e
Keepin gAssis t
indicator lamp
lights up while
you are driving.Lan eKeepin gAssis tis deactivated.
XActivat eLan eKeepin gAssis tif necessar y (Ypage 147).
Indicator and warning lamps in the instrument cluster193
On-board computer and displays
Z
Page 196 of 290

ProblemPossible causes/consequences andMSolutions
Ã
The green Lane
Keeping Assist
indicator lamp
lights up while
you are driving.Lane Keeping Assist is operational.
ÃThe red Lane
Keeping Assist
indicator lamp
lights up while
you are driving.
Additionally, an
intermittent
warning tone
sounds.You are driving with the front wheel on a lane marking.
dThe yellow
ASR/ESP®warn-
ing lamp flashes
while the vehicle
is in motion.GWARNING
ESP
®or ASR is intervening because at least one of the wheels has
reached its tire grip limit.
Cruise control is deactivated for the duration of the intervention.
XAdapt your driving style to suit the road and traffic conditions. Do
not use too much throttle.
XDrive slowly.
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 148).
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 53).
194Indicator and warning lamps in the instrument cluster
On-board computer and displays
Page 197 of 290

ProblemPossible causes/consequences andMSolutions
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 176).
XStop the vehicle as soon as possible, paying attention to road and
traffic conditions.
XDo not drive on.
XConsult a qualified specialist workshop.
b The red brake sys-
tem indicator
lamp is lit while
the engine is run-
ning.There is insufficient brake fluid in the expansion tank.
GWARNING
Braking performance can be impaired.
There is a risk of an accident.
XVehicles with steering wheel buttons: also observe the messages in
the display (Ypage 176).
XStop the vehicle as soon as possible, paying attention to road and
traffic conditions.
XCheck the brake fluid level in the expansion tank (Ypage 223).
XIf the brake fluid is below the MIN mark: do not drive on!
XDo not add brake fluid. This does not solve the problem.
XConsult a qualified specialist workshop.
b When towing a
trailer: the red
brake system
indicator lamp is
lit while the
engine is running.
Additionally, a
warning tone
sounds.GWARNING
The brake force booster in the trailer is faulty.
The driving and braking characteristics of your vehicle could change.
There is a risk of the trailer overbraking and of you losing control over
the truck/trailer combination.
There is a risk of an accident.
XVehicles with steering wheel buttons: also observe the messages in
the display (Ypage 176).
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 cluster195
On-board computer and displays
Z
Page 198 of 290

ProblemPossible causes/consequences andMSolutions
:
The yellow
ASR/BAS indica-
tor lamp is lit
while the engine
is running.ASR has been deactivated due to a malfunction.
The engine power output may be reduced.
GWARNING
The driven wheels can spin when accelerating.
There is an increased risk of skidding and accidents.
XDrive on with care.
XConsult a qualified specialist workshop as soon as possible.
: The yellow
ASR/BAS indica-
tor lamp is lit
while the engine
is running.BAS has been deactivated due to a malfunction.
GWARNING
The brake system continues to function normally, but without elec-
tronic support.
The braking distance can increase in emergency braking situations.
There is a risk of an accident.
XDrive on with care.
XVisit a qualified specialist workshop immediately.
: 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.
196Indicator and warning lamps in the instrument cluster
On-board computer and displays
Page 199 of 290

ProblemPossible causes/consequences andMSolutions
!
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 vehicle range.
XObserve the messages in the display.
h
The yellow ESP®
indicator lamp is
lit while the
engine is running.ESP®is deactivated due to undervoltage or a malfunction. As a result,
cruise control has also been deactivated.
Engine power output may be reduced.
The battery may not be being charged.
GWARNING
If ESP
®is not operational, ESP®will not stabilize the vehicle.
There is an increased risk of skidding and accidents.
XVehicles with steering wheel buttons: also observe the messages in the display (Ypage 176).
XDrive on with care.
XVisit a qualified specialist workshop immediately.
Indicator and warning lamps in the instrument cluster197
On-board computer and displays
Z
Page 200 of 290

ProblemPossible causes/consequences andMSolutions
6
The red warning
lamp does not go
out approx-
imately 4 seconds
after the ignition
is switched on, or
it lights up again.The restraint systems have malfunctioned.
GWARNING
If the restraint systems are malfunctioning, individual systems could
be triggered inadvertently or might not be triggered at all in the event
of an accident.
There is an increased risk of injury and accidents.
XDrive on with care.
XVisit a qualified specialist workshop immediately.
# The red battery
indicator lamp is
lit while the
engine is running.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 the near-
est qualified specialist workshop.
XIf the poly-V-belt is not damaged: have the vehicle checked as soon
as possible by a qualified specialist workshop.
#The red battery
indicator lamp is
lit while the
engine is running.The battery is faulty.
XStop the vehicle as soon as possible, paying attention to road and
traffic conditions.
XDo not continue driving under any circumstances.
XConsult a qualified specialist workshop.
#The yellow brake
pad wear indica-
tor lamp is lit after
the engine is star-
ted or while the
vehicle is in
motion.The brake pads/linings have reached their wear limit.
GWARNING
Braking performance can be impaired.
There is a risk of an accident.
XHave the brake pads/linings replaced as soon as possible at a
qualified specialist workshop.
4 The yellow engine
oil level warning
lamp is lit after
the engine is star-
ted or while the
vehicle is in
motion.The oil level has dropped to the minimum level.
XCheck the engine for oil loss.
XIf oil loss is detected: consult a qualified specialist workshop imme-
diately.
XIf no oil loss is detected: check the oil level and add engine oil
(Ypage 221).
198Indicator and warning lamps in the instrument cluster
On-board computer and displays