Page 293 of 417
292 Practical hints
What to do if …
ProblemPossible causeSuggested solution
;(USA only)
3 (Canada only)
The red brake warning lamp
comes on while driving and you
hear a warning sound.You are driving with the parking brake set.Release the parking brake
(
page 50).
Also note the messages in the multi-
function display (
page 298).
The red brake warning lamp
comes on while driving.There is insufficient brake fluid in the reser-
voir.Risk of accident! Carefully stop the
vehicle and notify an authorized
Mercedes-Benz Light Truck Center.
Do not add brake fluid! This will not
solve the problem.
Also note the messages in the multi-
function display (
page 298).
Warning!G
Driving with the brake warning lamp illumi-
nated can result in an accident. Have your
brake system checked immediately if the
brake warning lamp stays on.
Do not add brake fluid before checking the
brake system. Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot
engine parts and the brake fluid catching
fire. You could be seriously burned.!
If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks.
Page 294 of 417
293 Practical hints
What to do if …
ProblemPossible causeSuggested solution
;(USA only)
3 (Canada only)
-The red brake warning lamp and
the yellow ABS indicator lamp
come on when the engine is run-
ning and you hear a warning
sound for approximately five sec-
onds.
The EBB has detected a malfunction and has
s w i t c h e d o f f . Y o u s h o u l d b e p r e p a r e d f o r y o u r
vehicle to perform differently than normal
when braking. Continue driving with added caution.
Have the system checked at an autho-
rized Mercedes-Benz Light Truck
Center as soon as possible.
Also note the messages in the multi-
function display (
page 298).
Failure to follow these instructions in-
creases the risk of accidents.
Page 295 of 417
294 Practical hints
What to do if …
ProblemPossible causeSuggested solution
?(USA only)
± (Canada only)
The yellow engine mal-
function indicator lamp
comes on while driving.
There is a malfunction of:
The fuel management system
The ignition system
The emission control system
Systems which impact emissions
Such malfunctions may result in excessive
emissions values and may switch the engine
to its limp-home mode. Serious damage can
occur to the emission system.
Have the vehicle checked as soon as possi-
ble by an authorized Mercedes-Benz Light
Truck Center.
An on-board diagnostic connector is used
by the service station to link the vehicle to
the shop diagnostics system. It allows the
accurate identification of system malfunc-
tions through the readout of diagnostic trou-
ble codes. It is located near the hood lock
release on the upper left of footwell.
A loss of pressure has been detected in the
fuel system. The fuel cap may not be closed
properly or the fuel system may be leaky.Check the fuel cap (page 239).
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 Light Truck Center.
Your fuel tank is empty.After refueling start, turn off and restart the
engine three or four times in succession.
The limp-home mode is canceled. You do
not need to have your vehicle checked.
Page 297 of 417
296 Practical hints
What to do if …
ProblemPossible causeSuggested solution
nates briefly after starting the
engine.The warning lamp reminds you to fasten seat
belts.Fasten your seat belt.
The yellow fuel tank reserve warning lamp
illuminates while driving.The fuel level has gone below the reserve
mark.Refuel at the next gas station.
Also note the messages in the multi-
function display (
page 298).
The yellow fuel tank reserve warning lamp is
blinking.The fuel cap is not closed tight.Check the fuel cap.
1The red SRS indicator lamp
comes on while driving.There is a malfunction in the restraint sys-
tems. The airbags or emergency tensioning
device (ETD) could deploy unexpectedly or
fail to activate in an accident.Drive with added caution to the near-
est authorized Mercedes-Benz Light
Truck Center.
Warning!G
In the event a malfunction of the SRS is indi-
cated as outlined above, the SRS may not be
operational.
For your safety, we strongly recommend
that you visit an authorized Mercedes-Benz
Light Truck Center immediately to have the
system checked; otherwise the SRS may not
be activated when needed in an accident.This could result in serious or fatal injury, or
it might deploy unexpectedly and unneces-
sarily which could also result in an accident
and/or injury to you or to others.
Page 303 of 417
302 Practical hints
What to do if …
DisplayDisplay messagePossible causePossible solution
ESPESP
NOT AVAILABLEThe charging voltage has fallen below
10 volts and the ESP has switched off.When the voltage is above this value
again, the ESP is operational again.
If necessary, have the generator (alter-
nator) and battery checked.
The ESP is deactivated because of a mal-
function or interrupted power supply. The
ABS and BAS might not be operational.
The system must be resynchronized.Synchronize the ESP. With vehicle sta-
tionary and the engine running, turn
the steering wheel completely to the
left and then to the right to synchro-
nize the ESP.
If the ESP message does not go out:
Continue driving with added caution.
Visit an authorized Mercedes-Benz
Light Truck Center as soon as possi-
ble.
Failure to follow these instructions in-
creases the risk of accident.
!
When synchronizing the ESP, make
sure you can turn the steering wheel in
both directions as far as it will go with-
out the wheels hitting any objects, e.g.
a road curb.
Page 304 of 417
303 Practical hints
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DisplayDisplay messagePossible causePossible solution
ESPESP
VISIT WORKSHOP!The ESP is switched off due to a malfunc-
tion or an interruption in the power sup-
ply.
The brake system is still functioning nor-
mally but without ESP, ABS and BAS avail-
able.
If in addition the ABS is malfunctioning,
only partial engine output will be avail-
able.Continue driving with added caution.
Have the system checked at an autho-
rized Mercedes-Benz Light Truck
Center as soon as possible.
Failure to follow these instructions in-
creases the risk of accident.
Page 305 of 417
304 Practical hints
What to do if …
Symbol messages
Display symbolDisplay messagePossible causePossible solution
#BATTERY/ALTERNATOR
VISIT WORKSHOP!The battery was charged with a battery
charger or jump started.Have the battery checked at a service
station.
The battery is no longer charging.
Possible causes:
alternator malfunctioning
broken poly-V-belt
Stop immediately and check the
poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise
the engine will overheat due to an in-
operative water pump which may re-
sult in serious engine damage not
covered by the Mercedes-Benz Limited
Warranty. Notify an authorized
Mercedes-Benz Light Truck Center.
If it is intact:
Turn off unnecessary electric consum-
ers.
Drive immediately to the nearest
authorized Mercedes-Benz Light Truck
Center.
UNDERVOLTAGE
ENGINE ON!The battery has insufficient voltage.Start the engine.
Page 306 of 417
305 Practical hints
What to do if …
Display symbolDisplay messagePossible causePossible solution
#UNDERVOLTAGE
SWITCH CONSUMERS OFF!The battery has insufficient voltage.Have the battery checked at a ser-
vice station.
2BRAKE WEAR
VISIT WORKSHOP!The brake pads have reached their
wear limit.Have the brake pads replaced as
soon as possible.
3 BRAKE FLUID
VISIT WORKSHOP!There is insufficient brake fluid in the
reservoir.Risk of accident! Stop the vehicle
and notify an authorized
Mercedes-Benz Light Truck Center.
Do not add brake fluid! This will not
solve the problem.
Warning!G
Driving with the message BRAKE FLUID
VISIT WORKSHOP
displayed can result in an
accident. Have your brake system checked
immediately.
Do not add brake fluid before checking the
brake system. Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot
engine parts and the brake fluid catching
fire. You can be seriously burned.
!
If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks.
!
Brake pad thickness must be visually
checked by a qualified technician at the
intervals specified in the Maintenance
Booklet.
