Display messagesPossible causes/consequences andMSolutions
b
Brake fluid Visitworkshop
There is insufficientbrak efluid in 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 223).
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 .
Display messages183
On-board computer and displays
Z
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 131).
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.
184Display messages
On-board computer and displays
Lights
Display messagesPossible causes/consequences andMSolutions
b
Low beam left
The left-hand low beam is faulty3.
XHalogen headlamps:replace the bulb as soon as possible
(Ypage 87).
XBi-Xenon headlamps: consult a qualified specialist workshop as
soon as possible.
b
Low beam right
The right-hand low-beam headlamp is faulty3.
XHalogen headlamps: replace the bulb as soon as possible
(Ypage 87).
XBi-Xenon headlamps: consult a qualified specialist workshop as
soon as possible.
b
Cornering lt. left
The left-hand cornering light is faulty3.
XReplace the bulb as soon as possible (Ypage 87).
b
Cornering lt. right
The right-hand cornering light is faulty3.
XReplace the bulb as soon as possible (Ypage 87).
b
Lights on auto‐matic. Remove key
The automatic headlamp feature is active: the light switch is in the
à position and you have forgotten to remove the key.
XRemove the key from the ignition lock.
b
Turn signal left
The left-hand turn signal is faulty.
XChange the bulb as soon as possible in the front (Ypage 88) or rear
(Ypage 89) indicator lamp.
b
Turn signal right
The right-hand turn signal is faulty.
XChange the bulb as soon as possible in the front (Ypage 88) or rear
(Ypage 89) indicator lamp.
b
Brake lamp left
The left brake lamp is faulty3.
XReplace the bulb as soon as possible (Ypage 89).
b
Brake lamp right
The right brake lamp is faulty3.
XReplace the bulb as soon as possible (Ypage 89).
b
Third brake lamp
The high-mounted brake lamp is faulty3. This display message will only
appear if all LEDs have failed.
XConsult a qualified specialized workshop as soon as possible.
b
High beam left
The left high-beam headlamp is faulty3.
XReplace the bulb as soon as possible (Ypage 87).
3Depending on the equipment, the bulb-failure indicator may not befeatured for any lamps other than the turn
signals.
Display messages185
On-board computer and displays
Z
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
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
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
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
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