Page 353 of 421

Problem
Possible causes/consequences and
X XSolutions Vehicles with auto-
matic child seat recog-
nition on the front-
passenger seat*:
The
4 PASSENGER
AIRBAG OFF warning
lamp beside the instru-
ment cluster on the
right is lit. A special Mercedes-Benz child seat with automatic child seat rec-
ognition has been fitted to the front-passenger seat. The front-
passenger airbag has therefore been disabled as desired.
G
Risk of injury
There is no child seat fitted to the front-passenger seat. The auto-
matic child seat recognition* is malfunctioning.
X Remove electronic equipment from the front-passenger seat,
for example:
R
notebook
R mobile phone
R cards with transponders, e.g. ski passes or access passes
If the 4 PASSENGER AIRBAG OFF warning lamp is still lit:
X Visit a qualified specialist workshop. The yellow
9Blind
Spot Assist* indicator
lamps light up in the
exterior mirrors. G
Risk of accident
Blind Spot Assist* is not active at speeds below 30 km/h. In this
case, there will be no indication if there are vehicles in the Blind
Spot Assist monitoring range.
X You must therefore pay careful attention to the traffic condi-
tions.
X Check whether a lane change can be made without risk. The red
9Blind
Spot Assist* warning
lamp is lit in one of the
exterior mirrors. G
Risk of accident
Blind Spot Assist* has detected a vehicle within the Blind Spot
Assist monitoring range.
X You must therefore pay careful attention to the traffic condi-
tions.
X Check whether a lane change can be made without risk. The red
9Blind
Spot Assist* warning
lamp flashes in one of
the exterior mirrors. A
double warning tone
also sounds. You have switched on the turn signals.
G Risk of accident
Blind Spot Assist* has detected a vehicle within the Blind Spot
Assist monitoring range.
X You must therefore pay careful attention to the traffic condi-
tions.
X Check whether a lane change can be made without risk. 350
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Page 354 of 421

Warning and indicator lamps in the instrument cluster
Problem
Possible causes/consequences and
X
X Solutions !
The yellow ABS
warning lamp is
lit while the
engine is run-
ning. G
Risk of accident
ABS (Anti-lock Brake System) is deactivated due to a fault. Other
systems, e.g. BAS (Brake Assist), BAS PLUS* (Brake Assist Plus),
ESP ®
(Electronic Stability Program), EBV (electronic brake-force
distribution), PRE-SAFE ®
, PRE-SAFE ®
Brake*, HOLD, hill start
assist, the adaptive brake lights and ESP ®
trailer stabilisation, are
also deactivated.
The brake system continues to function normally, but without the
functions listed above. Therefore, the wheels could lock if you
brake hard.
X Observe the additional messages in the multi-function display
(Y page 316).
X Drive on carefully.
X Visit a qualified specialist workshop. ·
The red distance
warning lamp*
lights up while
the vehicle is in
motion. G
Risk of accident
The distance to the vehicle in front is too small for the speed
selected.
X Increase the distance. ·
The red distance
warning lamp*
lights up while
the vehicle is in
motion. A warn-
ing tone also
sounds. G
Risk of accident
You are approaching a vehicle in front at too great a speed
X Be prepared to brake immediately.
X Pay careful attention to the traffic situation. You may have to
brake or take evasive action. G
Risk of accident
Distronic* or Distronic Plus* has detected a stationary obstacle
in your line of travel. The vehicle will not be braked automatically.
X Be prepared to brake immediately.
X Pay careful attention to the traffic situation. You may have to
brake or take evasive action. Troubleshooting
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Page 355 of 421

Problem
Possible causes/consequences and
X XSolutions ÷
å
J
!
The yellow ESP
®
and ESP ®
OFF
warning lamps,
the red brake
system warning
lamp and the
yellow ABS
warning lamp
are lit while the
engine is run-
ning. G
Risk of accident
Electronic brake force distribution (EBV) is faulty. Other systems,
e.g. ABS, BAS, BAS PLUS*, ESP ®
, PRE-SAFE ®
, PRE-SAFE ®
Brake*, HOLD, hill start assist, the adaptive brake lights and
ESP ®
trailer stabilisation, are also unavailable. The brake system
continues to function normally, but without the functions listed
above. Therefore, the wheels could lock if you brake hard.
X Observe the additional messages in the multi-function display
(Y page 316).
X Drive on carefully.
X Visit a qualified specialist workshop. ÷
å
!
The yellow ESP
®
and ESP ®
OFF
warning lamps
and the yellow
ABS warning
lamp are lit while
the engine is
running. A warn-
ing tone also
sounds. G
Risk of accident
EBV is faulty. Other systems, e.g. ABS, BAS, BAS PLUS*, ESP ®
,
PRE-SAFE ®
, PRE-SAFE ®
Brake*, HOLD, hill start assist, the adap-
tive brake lights and ESP ®
trailer stabilisation, are also unavaila-
ble. The brake system continues to function normally, but without
the functions listed above. Therefore, the wheels could lock if you
brake hard.
X Observe the additional messages in the multi-function display
(Y page 316).
X Drive on carefully.
X Visit a qualified specialist workshop. ÷
å
!
The yellow ESP
®
and ESP ®
OFF
warning lamps
and the yellow
ABS warning
lamp are lit while
the engine is
running. G
Risk of accident
ABS and ESP ®
are faulty. Other systems, e.g. BAS, BAS PLUS*,
PRE-SAFE ®
, PRE-SAFE ®
Brake*, HOLD, hill start assist, the adap-
tive brake lights and ESP ®
trailer stabilisation, are also unavailable
due to a malfunction. The brake system continues to function nor-
mally, but without the functions listed above. Therefore, the
wheels could lock if you brake hard.
X Observe the additional messages in the multi-function display
(Y page 316).
X Drive on carefully.
X Visit a qualified specialist workshop. 352
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Page 356 of 421

Problem
Possible causes/consequences and
X
X Solutions ÷
The yellow ESP ®
warning lamp
flashes while the
vehicle is in
motion. G
Risk of accident
ESP ®
or traction control has intervened because there is a risk of
skidding or at least one wheel has started to spin.
Cruise control or Distronic Plus* is deactivated.
X Only depress the accelerator pedal as far as necessary when
pulling away.
X Release the accelerator pedal while you are driving.
X Adapt your driving style to suit the road and weather conditions.
X Do not deactivate ESP ®
.
Exceptions: (Y page 51) å
The yellow ESP ®
OFF warning
lamp is lit while
the engine is
running. G
Risk of accident
ESP ®
and ESP ®
trailer stabilisation are deactivated. ESP ®
will not
stabilise the vehicle if it starts to skid or if a wheel starts to spin.
X Reactivate ESP ®
.
Exceptions: (Y page 51)
X Adapt your driving style to suit the road and weather conditions. ÷
å
The yellow ESP
®
and ESP ®
OFF
warning lamps
are lit while the
engine is run-
ning. G
Risk of accident
ESP ®
, BAS, BAS PLUS*, PRE-SAFE ®
, HOLD, hill start assist, the
adaptive brake lights and ESP ®
trailer stabilisation are unavailable
due to a malfunction. ESP ®
will not stabilise the vehicle if it starts
to skid or if a wheel starts to spin.
The brake system continues to function normally, but without the
functions listed above.
X Observe the additional messages in the multi-function display
(Y page 316).
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. Troubleshooting
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Page 357 of 421

Problem
Possible causes/consequences and
X XSolutions !
The red indicator
lamp for the
electric parking
brake flashes
and/or the yel-
low warning
lamp for the
electric parking
brake lights up. G
Risk of accident
The electric parking brake is temporarily malfunctioning or defec-
tive.
X Observe the additional messages in the multi-function display
(Y page 316). 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 316).
Do not top up the brake fluid. This will not rectify the fault. ;
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
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. h
The yellow tyre
pressure moni-
tor* warning
lamp is on. G
Risk of accident
The tyre pressure monitor* has detected a sudden or significant
pressure loss in at least one of the tyres.
X Stop the vehicle without making any sudden steering or braking
manoeuvres. Pay attention to traffic conditions as you do so.
X Observe the additional messages in the multi-function display
(Y page 316). 354
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Page 358 of 421

Problem
Possible causes/consequences and
X
X Solutions 7
The red seat belt
warning lamp
lights up for 6
seconds after
the engine is
started 39
. The seat belt warning lamp reminds the driver and front passenger
to fasten their seat belts.
X Fasten your seat belt (Y page 191). 7
After the engine
starts, a warning
tone sounds for
up to 6 sec-
onds39
. G
Risk of injury
The driver's seat belt is not fastened.
X Fasten your seat belt (Y page 191).
The warning tone ceases. 7
The red seat belt
warning lamp
lights up after
the engine
starts, as soon
as the driver's
door or the
front-passenger
door is closed. G
Risk of injury
The driver or front passenger have not fastened their seat belt.
X Fasten your seat belt (Y page 191).
The warning lamp goes out. G
Risk of injury
There are objects on the front-passenger seat
X Remove the objects from the front-passenger seat and stow
them safely.
The warning lamp goes out. 7
The red seat belt
warning lamp
flashes and an
intermittent
audible warning
sounds. G
Risk of injury
The driver or front passenger have not fastened their seat belt. At
the same time, you are driving faster than 25 km/h or have briefly
driven faster than 25 km/h.
X Fasten your seat belt (Y page 191).
The warning lamp goes out and the intermittent audible warning
ceases. G
Risk of injury
There are objects on the front-passenger seat At the same time,
you are driving faster than 25 km/h or have briefly driven faster
than 25 km/h.
X Remove the objects from the front-passenger seat and stow
them safely.
The warning lamp goes out and the intermittent audible warning
ceases. 39
Only for certain countries. Troubleshooting
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Page 359 of 421

Problem
Possible causes/consequences and
X XSolutions The yellow reserve fuel
warning lamp lights up
while the engine is run-
ning. The fuel level has fallen below the reserve range. The operation of
the auxiliary heating* can no longer be guaranteed.
X
Refuel at the nearest filling station. Warning tones
Problem
Possible causes/consequences and
X XSolutions 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 316).You are driving with the electric parking brake applied.
X
Release the electric 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 have not fastened their seat belt.
X Fasten your seat belt (Y page 191).You hear a warning
tone.
The
· red distance warning lamp* lights up while the vehicle
is in motion.
X Observe the explanations for the distance warning lamp*
(Y page 351). You hear a dual warning
tone.
The
9 red Blind Spot Assist* warning lamp flashes in one of
the exterior mirrors.
X Observe the explanations for the Blind Spot Assist* warning
lamp (Y page 350). 356
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Page 360 of 421

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. Fuel and fuel tank
Problem
Possible causes/consequences and
X
X Solutions Fuel is leaking from the
vehicle.
G
Risk of explosion or fire
The fuel line or the fuel tank is defective.
X Turn the key to position 0(Y page 182) in the ignition lock
immediately and remove it.
X Do not restart the engine under any circumstances.
X Consult a qualified specialist workshop. The fuel filler flap can-
not be opened. The fuel filler flap is not released.
Or:
The key batteries are discharged.
X
Unlock the vehicle (Y page 366).
Or:
X Unlock the vehicle using the emergency key element
(Y page 365). The fuel filler flap is released, but the opening mechanism is jam-
med.
X
Consult a qualified specialist workshop. Troubleshooting
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