Display messages
Possible causes/consequences and
X
X Solutions Check
tyres Tyre pres-
sure Check
tyres
G
Risk of accident
The tyre pressure loss warning system has detected a signif-
icant loss in pressure. A warning tone also sounds.
X Stop the vehicle without making any sudden steering or
braking manoeuvres. Pay attention to traffic conditions as
you do so.
X Check the tyres.
X Correct the tyre pressure. If necessary, set the correct tyre
pressure ( Ypage 152).
X If necessary, repair any defective tyres or change the wheel
(Y page 222).
X Restart the tyre pressure loss warning system once the tyre
pressure is correct (Y page 153). Run Flat
Indicator
inopera-
tive Run Flat
Indicator
inopera-
tive The tyre pressure loss warning system is faulty.
X
Visit a qualified specialist workshop. Check
tyres
Restart
system Check tyre
pressures
then
restart
Run Flat
Indicator A display message for the tyre pressure loss warning system
was shown.
X
Set the correct tyre pressure for all tyres (Y page 152).
X Restart the tyre pressure loss warning system
(Y page 153). Key does
not belong
to vehicle You have put the wrong key in the ignition lock.
X
Use the correct key. Close
doors to
lock veh. At least one door is open. A warning tone also sounds.
X
Close all doors and lock the vehicle again. PRE-SAFE
inopera-
tive PRE-SAFE
inopera-
tive See
Owner's
Manual
G
Risk of injury
Important functions of PRE-SAFE ®
* have failed. All other
occupant safety systems, e.g. airbags, remain available.
X Visit a qualified specialist workshop. Display
messages
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Benz recommends that you use a Mercedes-Benz Service Centre for this purpose. In particular,
work relevant to safety or on safety-related systems must be carried out at a qualified specialist
workshop. Display messages
Possible causes/consequences and
X
X Solutions 7 G
Risk of injury
If the symbol appears in the multi-function display, a seat belt
buckle has been released on a rear seat while driving.
X Ask occupants in the rear to fasten their seat belts.
Further information on the status indicator for the rear seat
belts* (Y page 72) A The tailgate is open.
X
Close the tailgate. ? G
Risk of accident
Vehicles with an anti-theft alarm system*: the bonnet is open.
X Pull over and stop the vehicle safely as soon as possible,
paying attention to road and traffic conditions.
X Close the bonnet. ; At least one door is open. A warning tone also sounds.
X
Close the doors. ! ABS and
ESP cur-
rently
unavail.
See Own-
er's Man-
ual
G
Risk of accident
ABS (Anti-lock Braking System), ESP ®
(Electronic Stability
Program), BAS (Brake Assist), PRE-SAFE ®
*, hill start assist
and ESP ®
trailer stabilisation are temporarily unavailable. The
self diagnosis function might not be complete, for example.
The d warning lamp also lights up in the instrument clus-
ter.
The brake system continues to function normally, but without
the functions listed above.
X Carefully drive a short distance making slight steering
movements at a speed above 20 km/h.
The message goes out when ABS, ESP ®
, BAS, PRE-
SAFE ®
*, hill start assist and ESP ®
trailer stabilisation are
available again. Display messages
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Display messages
Possible causes/consequences and
X
X Solutions G
Risk of accident
ABS, ESP ®
, BAS, PRE-SAFE ®
*, hill start assist and ESP ®
trailer
stabilisation are unavailable due to undervoltage. The d
warning lamp also lights up in the instrument cluster.
The brake system continues to function normally, but without
the functions listed above.
X Drive on carefully.
X Visit a qualified specialist workshop. ! ABS and
ESP inop-
erative
See Own-
er's Man-
ual
G
Risk of accident
ABS, ESP ®
, BAS, PRE-SAFE ®
*, hill start assist and ESP ®
trailer
stabilisation are unavailable due to a malfunction. The d
warning lamp also lights up in the instrument cluster.
The brake system continues to function normally, but without
the functions listed above.
X Drive on carefully.
X Visit a qualified specialist workshop. # The battery is not being charged. A warning tone also sounds.
Possible causes are:
R
a faulty alternator
R a torn poly-V-belt
R a malfunction in the electronics
X Pull over and stop the vehicle safely, paying attention to
road and traffic conditions and leave the engine running.
X Open the bonnet.
X Check whether the poly-V-belt is torn.
If the V-belt is torn:
! Do not continue driving. The engine could otherwise over-
heat.
X Switch off the engine.
X Consult a qualified specialist workshop.
If the poly-V-belt is OK:
X Visit a qualified specialist workshop. 184 Display
messagesPractical advice
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Display messages
Possible causes/consequences and
X
X Solutions # a
with 4
buttons:
Check
brake wear
a with
12 buttons:
Check
brake wear The brake pads/linings have reached their wear limit.
X
Visit a qualified specialist workshop. J Check
brake
fluid
level
G
Risk of accident
There is insufficient brake fluid in the brake fluid reservoir. In
addition, the Jindicator lamp in the instrument cluster
lights up and a warning tone sounds.
X Pull over and stop the vehicle safely as soon as possible,
paying attention to road and traffic conditions. Do not con-
tinue driving under any circumstances.
X Consult a qualified specialist workshop.
Do not top up the brake fluid. This will not rectify the fault. J a
with 4
buttons:
Release
park.
brake
a with
12 buttons:
Release
parking
brake You are driving with the parking brake applied. A warning tone
also sounds.
X
Release the parking brake. J EBV, ABS,
ESP inop-
erative
See Own-
er's Man-
ual
G
Risk of accident
EBV (electronic brake force distribution), ABS, ESP ®
, BAS,
PRE-SAFE ®
*, hill start assist and ESP ®
trailer stabilisation are
unavailable due to a malfunction. In addition, the dwarn-
ing lamp in the instrument cluster lights up and a warning tone
sounds.
The brake system continues to function normally, but without
the functions listed above.
X Drive on carefully.
X Visit a qualified specialist workshop immediately. Display
messages
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Display messages
Possible causes/consequences and
X
X Solutions à a
with 4
buttons:
inopera-
tive
a with
12 buttons:
inopera-
tive DSR is deactivated due to a malfunction.
X
Have DSR checked at a qualified specialist workshop. ? a
with 4
buttons:
Stop vehi-
cle Engine
off
a with
12 buttons:
Coolant
Stop vehi-
cle Switch
engine off The coolant is too hot. In addition, the
?warning lamp in
the instrument cluster lights up and a warning tone sounds.
X Pull over and stop the vehicle safely and switch off the
engine, paying attention to road and traffic conditions.
X Make sure that the air supply to the radiator is not blocked,
e.g. by slush.
X Wait until the display message disappears before restarting
the engine. Otherwise, there is a risk of engine damage.
X Observe the coolant temperature gauge.
X If the coolant temperature increases again, visit a qualified
specialist workshop immediately. The poly-V-belt may have torn. A warning tone also sounds.
X
Pull over and stop the vehicle safely and switch off the
engine, paying attention to road and traffic conditions.
X Check the poly-V-belt.
X If the poly-V-belt is not damaged: do not start the engine
again until the display message goes out. Otherwise, there
is a risk of engine damage.
X If the poly-V-belt is torn: do not continue driving. Consult
a qualified specialist workshop. ? The engine fan is faulty.
X
If the coolant temperature is less than 120 †, you can
continue driving to the nearest qualified specialist work-
shop.
X Avoid subjecting the engine to heavy loads (e.g. driving in
mountainous terrain) and stop-and-go driving. 186 Display
messagesPractical advice
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Problem
Possible causes/consequences and
X XSolutions d
The yellow ESP ®
warning lamp is
lit while the
engine is run-
ning. In addition,
a message
appears in the
multi-function
display. G
Risk of accident
ESP ®
is unavailable due to a malfunction. ESP ®
and ESP ®
trailer
stabilisation will not stabilise the vehicle if it starts to skid or if a
wheel starts to spin.
X Observe the additional messages in the multi-function display
(Y page 176).
X Drive on carefully.
X Visit a qualified specialist workshop. 6
The red SRS
warning lamp is
lit while the
engine is run-
ning. G
Risk of injury
There is a malfunction in the restraint system. The airbags or belt
tensioners may either be triggered unintentionally or, in the event
of an accident, not be triggered at all.
X Visit a qualified specialist workshop immediately. J
The red brake
system warning
lamp comes on
while you are
driving. A warn-
ing tone also
sounds. You are driving with the parking brake applied.
X
Release the parking brake.
The warning lamp goes out and the warning tone ceases. J
The red brake
system warning
lamp comes on
while the engine
is running. A
warning tone
also sounds. G
Risk of accident
There is insufficient brake fluid in the fluid reservoir.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Consult a qualified specialist workshop immediately.
X Observe the additional messages in the multi-function display
(Y page 176).
Do not top up the brake fluid. This will not rectify the fault. ?
The red coolant
warning lamp
lights up while
the engine is
running and the
coolant temper-
ature gauge is at
the start of the
scale. The temperature sensor for the coolant temperature gauge is
faulty.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
X
Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions. Do not continue
driving under any circumstances.
X Consult a qualified specialist workshop. 202 TroubleshootingPractical advice
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Problem
Possible causes/consequences and
X
X Solutions ?
The red coolant
warning lamp
comes on while
the engine is
running. A warn-
ing tone also
sounds. The coolant temperature has exceeded 130 †. The airflow to the
radiator may be blocked or the coolant level may be too low.
The engine is not being cooled sufficiently and may be damaged.
X
Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Allow the engine and coolant to cool.
X Make sure that the air supply to the radiator is not blocked, e.g.
by slush.
X Check the coolant level (Y page 149). Observe the warning
notes.
X If necessary, top up the coolant.
X Have the engine cooling system checked at a qualified specialist
workshop if the coolant needs topping up more often than usual.
If the coolant level is correct, the electric radiator fan may be
faulty.
X Do not continue driving under any circumstances.
X Consult a qualified specialist workshop. ;
The yellow
engine diagnos-
tics warning
lamp lights up
while the engine
is running. Vehicles with a diesel engine: the fuel tank has been run dry.
X
Start the engine three to four times after refuelling.
Emergency running mode is cancelled. The vehicle need not be
checked. ;
The yellow
engine diagnos-
tics warning
lamp lights up
while the engine
is running. There may be a fault, for example
R
in the engine management
R in the ignition system
R in the exhaust system
R in the ignition system (for vehicles with petrol engines)
The emission limit values may be exceeded and the engine can
run in emergency mode.
X Have the vehicle checked as soon as possible at a qualified
specialist workshop. 7
The red seat belt
warning lamp
lights up for 6
seconds after
the engine starts
up31
. The seat belt warning lamp reminds the driver and front passenger
to fasten their seat belts.
X Fasten your seat belt (Y page 70). Troubleshooting
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Warning tones
Problem
Possible causes/consequences and
X
X Solutions The anti-theft warning
alarm* is triggered. You have opened the vehicle with the anti-theft alarm system still
activated*.
X Switch off the alarm (Y page 55). You hear a warning
tone. A message appears in the multi-function display.
X
See the explanations for the display message (Y page 176). You are driving with the parking brake applied.
X
Release the parking brake. The lights are still switched on when you leave the vehicle.
X
Turn the light switch to $orc.
or
X If the rear foglamp is switched on: press the light switch in to
the stop. G
Risk of injury
The driver or front passenger has not fastened their seat belt
X Fasten your seat belt (Y page 70). Accident
Problem
Possible causes/consequences and
X
X Solutions Fuel is leaking from the
vehicle.
G
Risk of fire
The fuel line or the fuel tank has been damaged. The leaking fuel
creates a risk of fire or explosion.
X Switch off the ignition immediately.
X Remove the ignition key.
Do not restart the engine under any circumstances. The leaking
fuel creates a risk of fire or explosion.
X Consult a qualified specialist workshop. You are unable to
determine the extent of
the damage.
X
Consult a qualified specialist workshop. You cannot detect any
damage.
X
Start the engine as normal. Troubleshooting
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