Display messages
Possible causes/consequences and
X
X Solutions b Front
left park‐
ing lamp
or
Front
right
parking
lamp The front left-hand or right-hand parking lamp is faulty.
X
Halogen headlamps: replace the bulb (Ypage 304).
X Bi-xenon headlamp*: visit a qualified specialist workshop. b Left rev‐
ers. lamp
or
Right rev‐
ers. lamp The left-hand or right-hand reversing lamp is faulty.
X
Visit a qualified specialist workshop. b Rear left
side
marker
lamp
or
Rear
right
side
marker
lamp The rear left or right side marker lamp is faulty. The display
message will only appear if all LEDs have failed.
X
Visit a qualified specialist workshop. b Left day‐
time driv‐
ing lamp
or
Right
daytime
driving
lamp The left or right daytime driving lamp is faulty.
X
Visit a qualified specialist workshop. b Switch
off lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X
Turn the light switch to c.
or
X If the rear foglamp is switched on: press the light switch in
to the stop. Display
messages
273Practical advice
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Display messages
Possible causes/consequences and
X
X Solutions b Malfunc‐
tion See
Owner's
Manual The exterior lighting is faulty.
X
Visit a qualified specialist workshop. Vehicles with trailer coupling*: a fuse may have blown.
X
Check the fuses (Y page 328).
X If necessary, replace the blown fuse. Observe the warning
notes.
If the display message continues to be shown:
X Visit a qualified specialist workshop. ¸ Replace
air
cleaner
The engine air filter is dirty and must be replaced
42
.
X Visit a qualified specialist workshop. 4 Check
eng. oil
lev. when
next refu‐
elling The engine oil level has dropped to a critical level. A warning
tone also sounds.
X
Check the engine oil level ( Ypage 220).
X If necessary, top up the engine oil.
X Have the engine checked for leaks if the engine oil needs
topping up more often than usual. + Change
key bat‐
teries The key batteries are discharged.
X
Change the batteries ( Ypage 304). + Key not
detected
(red display
message)
The KEYLESS GO key* is not in the vehicle. A warning tone
also sounds.
If you switch off the engine, you can no longer centrally lock
the vehicle and no longer start the engine.
X
Pull over and stop the vehicle safely as soon as possible,
paying attention to road and traffic conditions.
X Locate the KEYLESS GO key*. The KEYLESS GO key* is not detected while driving because
a powerful radio transmitter is causing interference. A warn-
ing tone also sounds.
X
Pull over and stop the vehicle safely as soon as possible,
paying attention to road and traffic conditions.
X Remove the Start/Stop button* from the ignition
lock (Y page 75).
X Insert the key into the ignition lock and turn it to the desired
position. 42
Only for certain vehicles. 274
Display
messagesPractical advice
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Display messages
Possible causes/consequences and
X
X Solutions + Key not
detected
(white dis-
play mes-
sage) You want to unlock or lock the vehicle and the KEYLESS GO
key* cannot be currently detected by the vehicle.
X
Locate the KEYLESS GO key*.
If the KEYLESS GO key* is still not detected:
X Lock or unlock the vehicle using the key. You are in the vehicle and the KEYLESS GO key* currently
cannot be detected by the vehicle.
X
Change the location of the KEYLESS GO key* in the vehicle.
If the KEYLESS GO key* is still not detected:
X Remove the Start/Stop button* from the ignition
lock (Y page 75).
X Insert the key into the ignition lock and turn it to the desired
position. + Key still
in vehicle
The KEYLESS GO key* has been detected inside the vehicle
during locking.
X
Remove the KEYLESS GO key* from the vehicle. + Replace
key The key must be replaced.
X
Visit a qualified specialist workshop. + 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 vehi‐
cle At least one door is open. A warning tone also sounds.
X
Close all doors and lock the vehicle again. + Pull
starting
button
out then
insert key
KEYLESS GO* is temporarily malfunctioning or is defective. A
warning tone also sounds.
X
Remove the Start/Stop button* from the ignition
lock (Y page 75).
X Insert the key into the ignition lock and turn it to the desired
position. Display
messages
275Practical advice
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Display messages
Possible causes/consequences and
X
X Solutions h Tyre pres‐
sure Cau‐
tion,
tyre malf.
G
Risk of accident
Vehicles with the tyre pressure monitor*: the pressure is
dropping rapidly in one or more of the tyres. 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 Repair the faulty tyre or replace the wheel ( Ypage 309). h Tyre pres‐
sure
Check
tyre(s)
G
Risk of accident
Vehicles with tyre pressure monitor*: the tyre pressure has
dropped significantly in one or more of the tyres. 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 Correct the tyre pressure (Y page 225).
X If necessary, repair any defective tyres or change the wheel
(Y page 309). & inopera‐
tive Bat‐
tery low The on-board voltage is too low. The auxiliary heating/venti-
lation* has switched off or cannot be switched on.
X
Drive for a longer distance.
The battery is being charged. The auxiliary heating/venti-
lation *can be reactivated as soon as there is sufficient on-
board voltage. & inopera‐
tive
Refuel
vehicle The fuel level in the fuel tank is too low. The auxiliary heat-
ing* cannot be switched on.
X
Refuel at the nearest filling station. & inopera‐
tive See
Owner's
Man.
The auxiliary heating
*is temporarily malfunctioning or is
defective.
X When the vehicle is on a level surface and the engine has
cooled down, make up to four attempts to switch on the
auxiliary heating*, waiting several minutes between each
attempt.
X If the auxiliary heating* does not switch on, visit a qualified
specialist workshop. 276
Display messagesPractical advice
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Display messages
Possible causes/consequences and
X
X Solutions _ Rear left
seat back‐
rest not
locked
or
Rear
right
seat back‐
rest not
locked
G
Risk of injury
Saloon with through-loading feature* in the rear bench seat:
The backrest in the rear is not engaged on the left-hand or
right-hand side. A warning tone also sounds.
X Push the backrest back until it engages (Y page 195).6 Restraint
sys. mal‐
function
Consult
workshop
G
Risk of injury
There is a malfunction in the SRS (Supplemental Restraint
System). The 6warning lamp also lights up in the instru-
ment cluster.
X Visit a qualified specialist workshop. 6 Front
left mal‐
function
Consult
workshop
or
Front
right mal‐
function
Consult
workshop
G
Risk of injury
SRS has malfunctioned at the front on the left or right. The
6 warning lamp also lights up in the instrument cluster.
X Visit a qualified specialist workshop. 6 Rear left
malfunc‐
tion Con‐
sult work‐
shop
or
Rear
right mal‐
function
Consult
workshop
G
Risk of injury
SRS has malfunctioned at the rear* on the left or right. The
6 warning lamp also lights up in the instrument cluster.
X Visit a qualified specialist workshop. Display
messages
277Practical advice
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Display messages
Possible causes/consequences and
X
X Solutions 6 Rear
centre
malfunc‐
tion Con‐
sult work‐
shop
G
Risk of injury
SRS has malfunctioned at the rear centre*. The 6warning
lamp also lights up in the instrument cluster.
X Visit a qualified specialist workshop. 6 Left
windowbag
malfunc‐
tion Con‐
sult work‐
shop
or
Right
windowbag
malfunc‐
tion Con‐
sult work‐
shop
G
Risk of injury
There is a malfunction in the left-hand or right-hand window-
bag. The 6warning lamp also lights up in the instrument
cluster.
X Visit a qualified specialist workshop. C There is only a small amount of fuel in the fuel tank.
X
Refuel at the nearest filling station. 8 Reserve
fuel level The fuel level has fallen below the reserve range. The opera-
tion of the auxiliary heating* can no longer be guaranteed.
X
Refuel at the nearest filling station. ¥ Top up
washer
fluid The washer fluid level in the washer fluid reservoir has drop-
ped below the minimum.
X
Top up the windscreen washer fluid (Y page 222).Troubleshooting
Points to remember
G
Risk of accident and injury
The operating safety of the vehicle can be compromised if maintenance work is carried out
incorrectly. This could cause you to lose control of the vehicle and cause an accident. The safety
systems may also not be able to protect you or others as they are designed to do.
Always have maintenance work carried out at a qualified specialist workshop. The qualified spe-
cialist workshop must have the necessary specialist knowledge and tools to carry out the work
required. Mercedes-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. 278
TroubleshootingPractical advice
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Warning and indicator lamps in switches, buttons and exterior mirrors
Problem
Possible causes/consequences and
X
X Solutions The seat ventilation*
has switched off pre-
maturely or cannot be
switched on. The on-board voltage is too low, because too many consumers are
switched on.
X
Switch off consumers that are not required, e.g. rear window
heating or interior lighting. The seat heating* has
switched off prema-
turely or cannot be
switched on. The on-board voltage is too low, because too many consumers are
switched on.
X
Switch off consumers that are not required, e.g. rear window
heating or interior lighting. The steering wheel
heating* indicator lamp
on the lower left lever of
the steering column is
flashing. The on-board voltage is too low, because too many consumers are
switched on. The steering wheel heating* has switched off auto-
matically.
X
Switch off consumers that are not required, e.g. rear window
heating or interior lighting.
Once the battery is sufficiently charged, the steering wheel
heating* will switch back on automatically. When you press the
¿
button on the
control panel for
Thermatic 2-zone auto-
matic climate control/
Thermotronic luxury 3-
zone automatic climate
control*, the indicator
lamp in the button
flashes three times or
remains off. The cool-
ing system cannot be
switched on. Cooling has been deactivated due to a malfunction.
X Visit a qualified specialist workshop. The rear-window heat-
ing has switched off
prematurely or cannot
be switched on. The on-board voltage is too low, because too many consumers are
switched on.
X
Switch off consumers that are not required, e.g. seat heating*
or interior lighting.
Once the battery is sufficiently charged, the rear window heating
will switch back on automatically. Troubleshooting
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Problem
Possible causes/consequences and
X XSolutions Vehicles with auto-
matic child seat recog-
nition on the front-
passenger seat*:
The
45indica-
tor lamp on the centre
console 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 45indicator lamp remains 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 Blind Spot
Assist* warning lamp
9
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 Blind Spot
Assist* warning lamp
9
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. 280
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