Page 341 of 480

340 Practical hintsWhat to do if …Problem
Possible cause/consequence
Suggested solution
<
The red seat belt telltale comes
on and a warning chime sounds
for approximately 6 seconds
after starting the engine with all
doors closed.
The seat belt telltale reminds you and your
passengers to fasten your seat belts before
driving off.
Fasten your seat belts.
The seat belt telltale goes out.
<
The red seat belt telltale remains
illuminated after driving off. The
vehicle’s speed does not exceed
15 mph (25 km/h).
You and/or your front passenger have
forgotten to fasten your seat belts.
Fasten your seat belts.
There are items placed on the front passen-
ger seat and therefore the system senses the
front passenger seat as being occupied.
Remove the items from the front
passenger seat and put them in a safe
place.
<
The red seat belt telltale flashes
and you additionally hear an in-
termittent warning chime with in-
creasing intensity for a maximum
of 60 seconds from the time the
vehicle’s speed exceeds 15 mph
(25 km/h).
You and/or your front passenger have
forgotten to fasten your seat belts.
Fasten your seat belts.
There are items placed on the front passen-
ger seat and therefore the system senses the
front passenger seat as being occupied.
Remove the items from the front
passenger seat and put them in a safe
place.
iAfter 60 seconds with an unfastened
seat belt on one of the front seats, the
warning chime stops sounding and the
seat belt telltale illuminates continu-
ously. The seat belt telltale will only go
out if both the driver and front passen-
ger’s seat belt are fastened, or the ve-
hicle is standing still and a front door is
opened.
Page 344 of 480

343 Practical hints
What to do if …
Warning!
G
Each tire, including the spare (if provided),
should be checked monthly when cold and
inflated to the inflation pressure recom-
mended by the vehicle manufacturer on the
vehicle placard or the tire inflation pressure
label. If your vehicle has tires of a different
size than the size indicated on the vehicle
placard or the tire inflation pressure label,
you should determine the proper tire infla-
tion pressure for those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitor-
ing system (TPMS) that illuminates a low tire
pressure telltale when one or more of your
tires is significantly under-inflated. Accord-
ingly, when the low tire pressure telltale illu-
minates, you should stop and check your
tires as soon as possible, and inflate them to
the proper pressure. Driving on a significant-
ly underinflated tire causes the tire to over-
heat and can lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehi-
cle’s handling and stopping ability. Please
note that the TPMS is not a substitute for
proper tire maintenance, and it is the driv-
er’s responsibility to maintain correct tire
pressure, even if underinflation has not
reached the level to trigger illumination of
the TPMS low tire pressure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate
when the system is not operating properly.
The TPMS malfunction indicator is com-
bined with the low tire pressure telltale.
When the system detects a malfunction, the
telltale will flash for approximately
one minute and then remain continuously
illuminated. This sequence will continue
upon subsequent vehicle start-ups as long
as the malfunction exists. When the mal-
function indicator is illuminated, the system
may not be able to detect or signal low tire
pressure as intended.
TPMS malfunctions may occur for a variety
of reasons, including the installation of in-
compatible replacement or alternate tires or
wheels on the vehicle that prevent the TPMS
from functioning properly. Always check the
TPMS malfunction telltale after replacing
one or more tires or wheels on your vehicle
to ensure that the replacement or alternate
tires and wheels allow the TPMS to continue
to function properly.
Page 356 of 480
355 Practical hints
What to do if …
Left display
Right display
Possible cause/consequence
Possible solution
P
Gear selector
lever to P
You have tried to start the engine with
the KEYLESS-GO* start/stop button
with the gear selector lever not in P.
Place the gear selector lever in position P.
You have tried to turn off the engine
with the KEYLESS-GO* start/stop but-
ton with the gear selector lever not in
P.You have opened the driver’s door
while engine is running with the gear
selector lever not in P.
SRS
Restraint
system malfunction
Visit
workshop
The SRS system (
page 64) is mal-
functioning.
Drive with added caution and have the
system checked at an authorized Mer-
cedes-Benz Center immediately.
Page 362 of 480

361 Practical hints
What to do if …
Left display
Right display
Possible cause/consequence
Possible solution
T
Reduced
braking power!
Depress brake
pedal fully!
The electro-hydraulic brake system
is in emergency operation mode.
Considerably greater brake pedal
force is required and the stopping
distance is increased.
The maximum speed is limited to
55 mph (90 km/h).
Do not drive any further.
Stop the vehicle in a safe location or as soon
as it is safe to do so and notify an authorized
Mercedes-Benz Center.
Prevent the vehicle from rolling away by
blocking the wheels with wheel chocks or oth-
er sizable objects.
Call for Roadside Assistance.
USA only:;Canada only:3
Reduced
brake effect
Start engine
The battery has insufficient voltage
and cannot supply sufficient power
to the electro-hydraulic brake sys-
tem.
Start the engine.
The message disappears when sufficient
voltage is available.
Warning!
G
Inhalation of exhaust gas is hazardous to
your health. All exhaust gas contains carbon
monoxide, and inhaling it can cause uncon-
sciousness and lead to death.
Do not run the engine in confined areas
(such as a garage) which are not properly
ventilated.
Page 367 of 480

366 Practical hintsWhat to do if …
During severe operating conditions, e.g.
stop-and-go traffic, the coolant tempera-
ture may rise close to 248°F (120°C).
Left display
Right display
Possible cause/consequence
Possible solution
•
Coolant
Stop, put engine off!
The coolant is too hot.
Stop the vehicle in a safe location and turn off
the engine.
Only start the engine again after the message
disappears. You could otherwise damage the
engine.
Warning!
G
Driving when your engine is badly overheat-
ed can cause some fluids which may have
leaked into the engine compartment to
catch fire. You could be seriously burned.
Steam from an overheated engine can cause
serious burns and can occur just by opening
the engine hood. Stay away from the engine
if you see or hear steam coming from it.
Turn off the engine, get out of the vehicle
and do not stand near the vehicle until the
engine has cooled down.
!The engine should not be operated with
the coolant temperature above 248°F
(120°C). Doing so may cause serious
engine damage which is not covered by
the Mercedes-Benz Limited Warranty.
Page 372 of 480

371 Practical hints
What to do if …
Left display
Right display
Possible cause/consequence
Possible solution
A
Reserve fuel
The fuel level has dropped below
the reserve mark.
Refuel at the next gas station (
page 269).
Check
fuel cap
See Oper. Manual
A loss of pressure has been detect-
ed in the fuel system. The fuel cap
may not be closed properly or the
fuel system may be leaky.
Check the fuel cap (
page 269).
If it is not closed properly:
Close the fuel cap.
If it is closed properly:
Have the fuel system checked by an autho-
rized Mercedes-Benz Center.
K
being lowered
The retractable hardtop is not com-
pletely opened or closed. The roof
hydraulics will start to lose pres-
sure.
Make sure the retractable hardtop is com-
pletely opened or closed (
page 195).
Lock
retractable roof
The retractable hardtop is not
locked properly.
Push or pull on the retractable hardtop switch
until the indicator lamp in the switch goes out
and the retractable hardtop is completely
open or closed (
page 195).
locked
in driving mode
You have attempted to open the re-
tractable hardtop while driving.
Stop the vehicle in a safe location and try to
open the hardtop again.
Visit
workshop
The retractable hardtop is malfunc-
tioning.
Have the retractable hardtop checked by an
authorized Mercedes-Benz Center.
Page 374 of 480

373 Practical hints
What to do if …
Left display
Right display
Possible cause/consequence
Possible solution
F
Key
not detected
The SmartKey with KEYLESS-GO* is
not recognized while the engine is
running because:
The SmartKey with
KEYLESS-GO* is not in the vehi-
cle.
There is strong radio-frequency
interference.
Stop the vehicle as soon as it is safe to do so.
Search for the SmartKey with KEYLESS-GO*
or continue to operate the vehicle with the
SmartKey.
Otherwise the vehicle cannot be centrally
locked nor can the engine be started again af-
ter the engine is stopped.
Key
not detected
The SmartKey with KEYLESS-GO* is
not recognized when attempting to
start the engine with the
KEYLESS-GO start/stop button* on
the gear selector lever because:
The SmartKey with
KEYLESS-GO* is not in the vehi-
cle.
The battery in the SmartKey
with KEYLESS-GO* is not insert-
ed properly or completely dis-
charged.
Change the position of the SmartKey with
KEYLESS-GO* in the vehicle.
Make sure the battery in the SmartKey with
KEYLESS-GO* is properly inserted
(page 390) and is not discharged
(page 106).
Operate the vehicle with the SmartKey if
necessary.
Page 379 of 480

378 Practical hintsWhat to do if …Left display
Right display
Possible cause/consequence
Possible solution
.
Right turn signal
Mirror
The right turn signal in the side mir-
ror is malfunctioning. This message
will only appear if all light emitting
diodes have stopped working.
Have the LEDs replaced as soon as possible.
Tail lamp
Left
Substitute
bulb on
The left tail lamp is malfunctioning.
A substitute bulb has been brought
into use.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Tail lamp
Right
Substitute
bulb on
The right tail lamp is malfunction-
ing. A substitute bulb has been
brought into use.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Turn off
lamps
You have removed the SmartKey
from the starter switch and opened
the driver’s door or removed the
SmartKey with KEYLESS-GO* from
the vehicle and left the headlamps
on.
Turn the exterior lamp switch toM.
Turn signal
Rear left
Substitute
bulb on
The left rear turn signal lamp is mal-
functioning. A substitute bulb has
been brought into use.
Replace the bulb as soon as possible.