Page 276 of 373
Display
messages 273Display messages Possible cause/consequence Possible solution
. Front foglamp,
left
or
Front foglamp,
right The front left-hand or right-hand foglamp
is faulty. X
Visit a qualified specialist workshop. . Rear left-hand
foglamp
or
Rear right-hand
foglamp The left-hand or right-hand rear foglamp is
faulty. X
Replace the bulb (Y page 310). . Parking lamp,
front left
or
Parking lamp,
front right The front left-hand or right-hand parking
lamp is faulty. X
Replace the bulb (Y page 306). . Reversing lamp,
left
or
Reversing lamp,
right The left-hand or right-hand reversing lamp
is faulty. X
Replace the bulb (Y page 306). . Left-hand tail
lamp
or
Right-hand tail
lamp The left-hand or right-hand tail lamp is
faulty. X
Replace the bulb (Y page 306). Practical advi
ce
251_AKB; 5; 7, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T14:51:51+02:00 - Seite 273 ZDateiname: 6515_1825_02_buchblock.pdf; preflight
Page 277 of 373

Display
messages 274 Display messages Possible cause/consequence Possible solution
ò Replace air
cleaner element The engine air filter must be replaced. X
Visit a qualified specialist workshop. N Check engine oil
level when next
refuelling The engine oil level has dropped to a crit-
ical level. X
Check the engine oil level (Y page 222) and top
up the engine oil if necessary.
X Have the engine checked for leaks if the engine
oil needs topping up more often than usual. N Engine oil level
Consult workshop The engine oil level has dropped to a crit-
ical level or the measuring system is mal-
functioning.
33 X
Check the engine oil level (Y page 222).
If the engine oil level is OK:
X Visit a qualified specialist workshop.
If the engine oil level is not OK:
X Top up the engine oil.
X If the warning message disappears: consult a
qualified specialist workshop.
X If the warning message does not disappear: do
not drive on. Consult the nearest qualified spe-
cialist workshop. H Tyre pressure Cau-
tion, tyre defect
G
Risk of accident
At least one tyre is rapidly deflating. The
affected wheel is highlighted in the tyre
pressure display of the tyre pressure mon-
itor*. X
Stop the vehicle without making any sudden
steering or braking manoeuvres. Pay attention
to the traffic conditions as you do so.
X Repair or change the tyre (Y page 313).33
Only for certain vehicles. Practical advi
ce
* optional
251_AKB; 5; 7, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T14:51:51+02:00 - Seite 274Dateiname: 6515_1825_02_buchblock.pdf; preflight
Page 278 of 373

Display
messages 275Display messages Possible cause/consequence Possible solution
H Tyre pressure
Check tyres G
Risk of accident
The pressure in one or more tyres has
dropped significantly. The affected wheel
is highlighted in the tyre pressure display
of the tyre pressure monitor*. X
Stop the vehicle without making any sudden
steering or braking manoeuvres. Pay attention
to the traffic conditions as you do so.
X Check the tyres.
X Repair or change the faulty tyre if necessary
(Y page 313).
X Check the tyre pressure and correct it if nec-
essary (Y page 226).
The warning will disappear automatically after
you have been driving for a few minutes with
the corrected tyre pressure. H Please correct
tyre pressure(s) Vehicles with a tyre pressure monitor*:
the pressure of at least one tyre is too low
or there is a significant discrepancy
between the tyre pressures of the individ-
ual wheels. X
Check the tyre pressure at the next opportunity
and correct it if necessary ( Ypage 226). I Change key batter-
ies The KEYLESS GO* key batteries are dis-
charged. X
Change the batteries (Y page 305).I Key does not belong
to vehicle You have put the wrong key in the ignition
lock. X
Use the correct key. I Key not detected
The KEYLESS GO* key is not in the vehicle.
If the engine is switched off, the vehicle
can no longer be locked centrally and the
engine cannot be started. X
Stop the vehicle. Pay attention to the traffic
conditions as you do so.
X Look for the KEYLESS GO *key. Practical advice
* optional
251_AKB; 5; 7, en-GB
wobuchh
,V ersion: 2.10.6
2008-05-11T14:51:51+02:00 - Seite 275 ZDateiname: 6515_1825_02_buchblock.pdf; preflight
Page 279 of 373

Display
messages 276 Display messages Possible cause/consequence Possible solution
I Key not detected
The KEYLESS GO* key is not detected
while the engine is running, due to radio
interference. X
Stop the vehicle. Pay attention to the traffic
conditions as you do so.
X Operate the vehicle using the key in the ignition
lock if necessary. I Key not detected
The KEYLESS GO* key cannot be detec-
ted. X
Change the location of the KEYLESS GO key*
within the vehicle.
X Operate the vehicle using the key in the ignition
lock if necessary. I Key detected in
vehicle
The KEYLESS GO key* has been detected
in the vehicle during locking. X
Remove the KEYLESS GO key* from the vehi-
cle. I You need a new key The key no longer functions. X
Visit a qualified specialist workshop. I Pull starting but-
ton out then insert
key Continuously unable to detect the KEY-
LESS GO key*. X
Operate your vehicle using the KEYLESS GO*
key in the ignition lock.
X Visit a qualified specialist workshop. X inoperative Bat-
tery weak The battery voltage is insufficient. The
auxiliary heating/ventilation* has
switched off or cannot be switched on. X
Drive for a longer distance.
The battery is being charged. The auxiliary
heating/ventilation* is reactivated as soon as
there is sufficient battery voltage. X inoperative Refuel There is insufficient fuel in the fuel tank.
The auxiliary heating* cannot be switched
on. X
Refuel at the nearest filling station. Practical advi
ce
* optional
251_AKB; 5; 7, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T14:51:51+02:00 - Seite 276Dateiname: 6515_1825_02_buchblock.pdf; preflight
Page 280 of 373

Display
messages 277Display messages Possible cause/consequence Possible solution
X inoperative See
Owner's Manual The auxiliary heating* has a temporary
malfunction or is faulty. X
When the vehicle is on a level surface and the
engine has cooled down: try to switch on the
auxiliary heating* four times, waiting for sev-
eral minutes between each attempt.
X If the auxiliary heating* does not switch on:
visit a qualified specialist workshop. ¿ There is only a small amount of fuel in the
fuel tank. X
Refuel at the nearest filling station. 4 Reserve fuel The fuel level has fallen below the reserve
range. The operation of the auxiliary heat-
ing* can no longer be guaranteed. X
Refuel at the nearest filling station. t Please enter PIN You have not yet logged on to your mobile
phone*. X
Enter the PIN for the SIM card. t Bluetooth ready The Bluetooth connection between your
mobile phone and the audio system or
COMAND APS* is not activated. X
If desired, activate the Bluetooth connection
between your mobile phone and the audio sys-
tem or COMAND APS* – please refer to the
separate operating instructions. t No telephone
inserted Your mobile phone is not inserted in the
bracket*. X
Insert mobile phone into the
bracket* ( Ypage 208). W Top up washer fluid The washer fluid level has dropped to
approximately
1
/ 3 of the total reservoir
capacity. X
Top up the washer fluid (Y page 223). Practical advi
ce
* optional
251_AKB; 5; 7, en-GB
wobuchh,
Version: 2.10.6 2008-05-11T14:51:51+02:00 - Seite 277 ZDateiname: 6515_1825_02_buchblock.pdf; preflight
Page 281 of 373

Troubleshooting
278 Troubleshooting
Points to remember
G
Risk of accident and injury
The operating safety of your vehicle could be compromised if service work is carried out improperly. You could lose control of the vehicle,
thereby causing an accident. Safety systems may also not be able to protect you or others as intended.
Always have maintenance work carried out at a qualified specialist workshop which has 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. Indicator and warning lamps in switches and buttons
Problem Possible cause/consequence Suggested solutions
One or all of the indicator lamps
in the seat ventilation* button are
flashing. There is insufficient voltage
because too many consumers are
switched on. The seat ventila-
tion* has switched itself off auto-
matically. X
Switch off consumers that are not required, e.g. reading lamps,
interior lighting, etc.
The seat ventilation* will automatically switch back on as soon as
there is sufficient voltage again. One or all of the indicator lamps
in the seat heating* button are
flashing. There is insufficient voltage
because too many consumers are
switched on. The seat heating*
has switched itself off automati-
cally. X
Switch off consumers that are not required, e.g. reading lamps,
interior lighting, etc.
The seat heating* will automatically switch back on as soon as
there is sufficient voltage again. Practical advice
* optional
251_AKB; 5; 7, en-GB
wobuchh
,V ersion: 2.10.6
2008-05-11T14:51:51+02:00 - Seite 278 Dateiname: 6515_1825_02_buchblock.pdf; preflight
Page 282 of 373

Troubleshooting
279Problem Possible cause/consequence Suggested solutions
The steering wheel heating* indi-
cator lamp on the lower left lever
of the steering column is flashing. There is insufficient voltage
because too many consumers are
switched on. The steering wheel
heating* has switched itself off
automatically. X
Switch off consumers that are not required, e.g. reading lamps,
interior lighting, etc.
The steering wheel heating* will automatically switch back on as
soon as there is sufficient voltage again. The indicator lamp in the
9
button on the 2-zone Thermatic/
multi-zone Thermotronic* con-
trol panel is lit. The cooling sys-
tem cannot be switched on. Cooling has been deactivated
due to a malfunction. X
Visit a qualified specialist workshop. The indicator lamp in the
1
rear-window heating button is
flashing. The rear-window heat-
ing has switched itself off prema-
turely or cannot be switched on. There is insufficient voltage
because too many consumers are
switched on. X
Switch off consumers that are not required, e.g. reading lamps,
interior lighting, etc.
The rear-window heating will automatically switch back on as soon
as there is sufficient voltage again. Vehicles with automatic child
seat recognition on the front-
passenger seat:
The 5 PASSENGER AIRBAG
OFF warning lamp on the centre
console is lit. A special Mercedes-Benz child
seat with automatic child seat
recognition has been fitted to the
front-passenger seat. The front-
passenger airbag has therefore
been disabled. Practical advice
* optional
251_AKB; 5; 7, en-GB
wobuchh
,V ersion: 2.10.6
2008-05-11T14:51:51+02:00 - Seite 279 ZDateiname: 6515_1825_02_buchblock.pdf; preflight
Page 283 of 373
Troubleshooting
280 Problem Possible cause/consequence Suggested solutions
Vehicles with automatic child
seat recognition on the front-
passenger seat:
The
5 PASSENGER AIRBAG
OFF warning lamp on the centre
console is lit. 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, e.g.:
R
notebook
R mobile phone
R cards with transponders, e.g. ski passes or access passes
If the 5 PASSENGER AIRBAG OFF warning lamp is still lit:
X Visit a qualified specialist workshop. Practical advice
251_AKB; 5; 7, en-GB
wobuchh
,V ersion: 2.10.6
2008-05-11T14:51:51+02:00 - Seite 280 Dateiname: 6515_1825_02_buchblock.pdf; preflight