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303 Practical hints
What to do if …
G
Display defective
The instrument cluster display is malfunc-
tioning.
Continue driving with added caution.
Visit an authorized Mercedes-Benz
Center as soon as possible.
G
Display defective
Visit workshop!
The displays for several systems have mal-
functioned. Some systems themselves may
also have malfunctioned.
Have the electronic systems
checked by an authorized
Mercedes-Benz Center.
L
Visit workshop!
One or more main functions of the Tele Aid
system are malfunctioning.
Have the Tele Aid system checked by
an authorized Mercedes-Benz Cen-
ter.
#
Malfunction
Electrical consumers
switched off
The consumer battery has insufficient volt-
age and can no longer supply the conve-
nience functions such as seat ventilation*.
The electrical consumers will come back
online as soon as on-board voltage is
sufficient.
#
Battery/Alternator
Stop vehicle!
The battery is malfunctioning.
The SBC brake system requires electrical
energy and therefore has only limited oper-
ation. Considerably greater brake pedal
force is required and the stopping distance
is increased.
Stop the vehicle as soon as it is safe
to do so. Adjust driving to be consis-
tent with reduced braking respon-
siveness.
Notify an authorized Mercedes-Benz
Center.
#
Undervoltage
Charge battery
The battery has insufficient voltage.
Start the engine (
page 43).
Display
Possible cause
Suggested solution
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304 Practical hintsWhat to do if …#
Undervoltage
Switch off
consumers
The battery has insufficient voltage.
Turn off unnecessary electrical con-
sumers.
–
Battery/Alternator
Visit workshop!
The battery was charged with a battery
charger or jump started.
The battery is no longer charging. Possible
causes:
Alternator malfunctioning
Broken poly-V-belt
Do not forget that the brake system re-
quires electrical energy and may be operat-
ing with restricted capability. Considerably
greater brake pedal force is required and
the stopping distance is increased.
Have the battery checked at a ser-
vice station.
Stop immediately and check the
poly-V-belt.
If it is broken:
Do not continue to drive. Notify
an authorized Mercedes-Benz
Center.
If it is in order:
Drive immediately to the nearest
authorized Mercedes-Benz Cen-
ter. Adjust driving to be consis-
tent with reduced braking
responsiveness.
Display
Possible cause
Suggested solution
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305 Practical hints
What to do if …
2
Brake wear
Visit workshop!
The brake pads have reached their wear
limit.
Brake pad thickness must be visually
inspected at the intervals specified in
the Service Booklet.
Have the brake pads replaced as
soon as possible.
T
Brake malfunction
Stop vehicle
The SBC brake system is in the limp-home
(emergency operation) mode. Consider-
ably greater brake pedal force is required
and the stopping distance is increased.
Do not exceed a speed of 55 mph
(90 km/h).
Do not drive any further.
Significantly greater force must be
applied to the brake pedal.
Call for roadside assistance.
Except Canada:;Canada only:3
Reduced braking effect
Start engine!
Increased braking dis-
tance
Start engine!
The battery has insufficient voltage and
cannot supply sufficient power to the SBC
brake system.
Start the engine.
The message disappears when suffi-
cient voltage is available
Display
Possible cause
Suggested solution
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306 Practical hintsWhat to do if …Except Canada:;Canada only:3
Reduced braking effect
Visit workshop!
Increased braking dis-
tance
Visit workshop!
The SBC brake system is in the limp-home
(emergency operation) mode. Consider-
able brake pedal force is required and the
stopping distance is increased.
Continue driving with added caution.
Adjust driving to be consistent with
reduced braking responsiveness.
Brake fluid
Visit workshop!
There is insufficient brake fluid in the reser-
voir.
Risk of accident! Stop the vehicle
and notify an authorized
Mercedes-Benz Center. Do not add
brake fluid! This will not solve the
problem.
Except Canada:;Canada only:3
Service brake
Visit workshop!
There are malfunctions, but the SBC brake
system is operating normally.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Display
Possible cause
Suggested solution
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Page 307 of 399
307 Practical hints
What to do if …
Except Canada:;Canada only:3
Brakes overheated!
Drive carefully!
The brake system is overheated due to an
excessive load on the brakes.
Relieve the load on the brake sys-
tem.
Drive more smoothly and think
ahead to avoid unnecessary braking.
When driving down slopes, shift into
a lower gear to use the engine’s brak-
ing power (
page 153).
Cautiously continue driving so that
the air stream will cool down the
brakes.
Display
Possible cause
Suggested solution
Warning!
G
Driving while these messages are displayed
can result in an accident. Have your brake
system checked immediately.
If there is a malfunction in the SBC brake
system, we recommend that the vehicle be
transported with all wheels off the ground
using flatbed or appropriate wheel lift/dolly
equipment. A tow bar must be used if cir-
cumstances do not permit the use of the
recommended towing methods and the ve-
hicle requires towing with all four wheels on
the ground. Towing the vehicle with all four
wheels on the ground is only permissible for
distances up to 30 miles (50 km) and at a
speed not to exceed 30 mph (50 km/h). For
more information, refer to "Towing the vehi-
cle" (
page 348).
If the SBC brake system enters its
limp-home (emergency operation) mode,
the driver must apply significantly greater
brake pedal pressure and depress the pedal
much further than normal to obtain braking
effect. If necessary, apply full pressure to
the brake pedal. Brakes are only applied to
the front wheels. Stopping distance is in-
creased!
Low brake fluid in the reservoir may cause
the braking system to fail!
Don’t add brake fluid before checking the
brake system. Overfilling the brake fluid
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Page 309 of 399
309 Practical hints
What to do if …
Display
Possible cause
Suggested solution
F
Key
Check battery!
The batteries in the KEYLESS-GO*
key are discharged.
Change the batteries (
page 328).
Key
not recognized!
The KEYLESS-GO* key is not recog-
nized while the engine is running be-
cause
the card is not in the vehicle
there is strong radio-frequency
interference
Stop the vehicle as soon as it is safe to do
so.
Search for the card or continue to operate
the vehicle with the key.
Otherwise the vehicle cannot be centrally
locked nor can the engine be started again
after the engine is stopped.
The KEYLESS-GO* key is momen-
tarily not recognized.
Change the position of the card in the vehi-
cle.
Operate the vehicle with the key if neces-
sary.
ì
Function
Not available!
This display appears if button ì
or í on the multifunction steer-
ing wheel is pressed and the vehicle
is not equipped with a telephone.
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310 Practical hintsWhat to do if …F
Key recognized
in vehicle!
A KEYLESS-GO* key left in the vehi-
cle was recognized while locking the
vehicle from the outside.
Take the key out of the vehicle.
Key
Visit workshop!
The KEYLESS-GO* system is mal-
functioning.
Visit an authorized Mercedes-Benz Center
as soon as possible.
Key
do not forget key
This display appears (for a maximum
of 60 seconds) if the driver’s door is
opened with the engine shut off and
no key in the starter switch.
This message is only a reminder.
Insert key in the starter switch.
_
Entry position
Do not drive!
Seat, mirrors and steering wheel
have not yet moved to their preset
driving positions.
Wait until the seat, mirrors and steering
wheel have moved to their driving positions.
The message disappears.
Except Canada:;Canada only:!
Release park. brake!
You are driving with the parking
brake set.
Release the parking brake (
page 45).
<
Visit workshop!
The seat belt system is malfunction-
ing.
Visit an authorized Mercedes-Benz Center
as soon as possible.
Ê
Trunk open!
This message will appear whenever
the trunk lid is open.
Close the trunk lid.
Display
Possible cause
Suggested solution
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311 Practical hints
What to do if …
W
Washer fluid
Check level
The fluid level has dropped to about 1/3 of total reservoir capacity.
Add washer fluid (
page 267).
B
Coolant
Check level
The coolant level is too low.
Add coolant (
page 264).
If you have to add coolant frequently, have
the cooling system checked by an autho-
rized Mercedes-Benz Center.
Ï
Coolant
Visit workshop!
The cooling fan for the coolant is
malfunctioning.
Observe the coolant temperature display.
Have the fan replaced as soon as possible.
Display
Possible cause
Suggested solution
Warning!
G
Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. You can be seriously burned.
!Do not ignore the low engine coolant
level warning. Extended driving with
the message and symbol displayed
may cause serious engine damage not
covered by the Mercedes-Benz Limited
Warranty.
Do not drive without sufficient amount
of coolant in the cooling system. The
engine will overheat causing major en-
gine damage.
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