Page 327 of 474

325 Practical hints
What to do if …
Problem
Possible cause
Suggested solution
-
The yellow ABS indicator lamp
comes on while driving.
The ABS has detected a malfunction and has
switched off. The BAS and the ESP are also
switched off (see messages in display).
The SBC brake system is still functioning nor-
mally but without ABS available.
If the ABS control unit is malfunctioning, oth-
er systems such as Parktronic*, Distronic*,
or the automatic transmission may also be
malfunctioning.
Continue driving with added caution.
Wheels may lock during hard braking,
reducing steering capability.
Have the system checked at an autho-
rized Mercedes-Benz Center as soon
as possible.
Failure to follow these instructions in-
creases the risk of an accident.
Read and observe messages in the
display (
page 335).
The charging voltage has fallen below
10 volts and the ABS was switched off.
The battery may not be sufficiently charged.
Switch off electrical consumers that
are currently not needed, e.g. seat
heating.
If necessary, have the generator and
battery checked.
When the voltage is above this value
again, the ABS is operational again.
Page 340 of 474
338 Practical hintsWhat to do if …Left display
Right display
Possible cause
Possible solution
ABC
Display malfunction
Visit
workshop
The ABC display or the ABC system it-
self is malfunctioning.
Visit an authorized
Mercedes-Benz Center as soon as
possible.
Visit
workshop
The capability of the ABC system is re-
stricted.
Do not exceed a speed of 50 mph
(80 km/h).
Visit an authorized Mercedes-Benz Center
as soon as possible.
ABS
Malfunction!
Visit
workshop!
The ABS has detected a malfunction
and has switched off.
The ESP and the BAS are also deacti-
vated.
The SBC brake system is still function-
ing normally but without the ABS avail-
able.
Continue driving with added caution.
Wheels may lock during hard braking,
reducing steering capability.
Have the system checked at an authorized
Mercedes-Benz Center as soon as
possible.
Failure to follow these instructions increases
the risk of an accident.
Page 341 of 474
339 Practical hints
What to do if …
Left display
Right display
Possible cause
Possible solution
ABS
Display malfunction
Visit
workshop!
The ABS or the ABS display is malfunc-
tioning.
Continue driving with added caution.
Wheels may lock during hard braking,
reducing steering capability.
Have the system checked at an authorized
Mercedes-Benz Center as soon as
possible.
Failure to follow these instructions increases
the risk of an accident.
Cruise control
Visit
workshop
Cruise control or Distronic* is mal-
functioning.
Have the cruise control or Distronic*
checked at an authorized Mercedes-Benz
Center as soon as possible.
Page 349 of 474

347 Practical hints
What to do if …
Left display
Right display
Possible cause
Possible solution
T
Reduced
braking power!
Depress brake
pedal fully!
The SBC brake system is in emer-
gency operation mode. Consider-
ably 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 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 SBC brake system.
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 359 of 474

357 Practical hints
What to do if …
Left display
Right display
Possible cause
Possible solution
A
Reserve fuel
The fuel level has dropped below
the reserve mark.
Refuel at the next gas station (
page 267).
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 267).
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
Visit
workshop
The retractable hardtop is malfunc-
tioning.
Have the retractable hardtop checked by an
authorized Mercedes-Benz Center.
K
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 196).
O
Close hood
You are driving with the hood open.
Close the hood (
page 271).
I
Remove
key
You have forgotten to remove the
SmartKey from the starter switch.
Remove the SmartKey from the starter
switch.
Replace
key
The batteries in the SmartKey are
discharged.
Change the batteries (
page 377).
Page 361 of 474

359 Practical hints
What to do if …
Left display
Right display
Possible cause
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.
The SmartKey with KEYLESS-GO* is
momentarily not recognized.
Change the position of the SmartKey with
KEYLESS-GO* in the vehicle.
Operate the vehicle with the SmartKey if
necessary.
Key
still
in vehicle
A SmartKey with KEYLESS-GO* left
in the vehicle was recognized while
locking the vehicle from the out-
side.
Take the SmartKey with KEYLESS-GO* out of
the vehicle.
.
3rd brake lamp
The high mounted brake lamp is
malfunctioning.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Brake lamp
Left
Auxiliary
lamp on!
The left brake lamp is malfunction-
ing. An auxiliary lamp has been
brought into use.
Visit an authorized Mercedes-Benz Center as
soon as possible.
Page 376 of 474
374 Practical hintsLocking/unlocking in an emergencyUnlocking the vehicle
If you are unable to unlock the driver’s
door using the SmartKey, open the door
using the mechanical key.
1Mechanical key locking tab
2Mechanical key
Move locking tab 1 direction of arrow
and slide the mechanical key 2 out of
the housing.Unlocking the driver’s door
1Unlocking
2Locking
Unlock the door with the mechanical
key. To do so, push the mechanical key
in the lock until it stops and turn it to
the left.
iUnlocking your vehicle with the me-
chanical key will trigger the anti-theft
alarm system. To cancel the alarm, do
one of the following:
Press button Œ or ‹on the
SmartKey.
Insert the SmartKey in the starter
switch.
Press the KEYLESS-GO* start/stop
button (
page 37).
Grasp the outside door handle (ve-
hicles with KEYLESS-GO* only).
Page 377 of 474

375 Practical hints
Locking/unlocking in an emergency
Unlocking the trunk
A minimum height clearance of
6.2 ft (1.89 m) is required to open the
trunk lid.
If you are unable to unlock the trunk with
the SmartKey, open the trunk with the me-
chanical key.
The handle is located above the rear li-
cense plate recess.Trunk lid lock1Unlocking
2Handle
Insert the mechanical key into the
trunk lid lock.
Turn the mechanical key counterclock-
wise to position 1 and hold it in this
position.
Pull the trunk lid handle 2 and lift lid.Unlocking interior storage compart-
ments
Locking storage areas in the passenger
compartment include:
the glove box
the storage compartment under the
armrest
the rear storage compartments
If these cannot be unlocked by means of
the SmartKey, the SmartKey with
KEYLESS-GO*, or the central locking but-
ton, use the mechanical key to open the
glove box.
iUnlocking your vehicle with the me-
chanical key will trigger the anti-theft
alarm system. To cancel the alarm, do
one of the following:
Press button Œ or ‹on the
SmartKey.
Insert the SmartKey in the starter
switch.
Press the KEYLESS-GO* start/stop
button (
page 37).
Grasp the outside door handle (ve-
hicles with KEYLESS-GO* only).
iThe storage compartment under the
armrest and the rear storage compart-
ments can only be unlocked at the
glove box lock using the mechanical
key.