2006 MERCEDES-BENZ G500 Owner's Manual

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.

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.

306 Practical hints
What to do if …
Display symbolDisplay messagePossible causePossible solution
3ELEC. BRAKE BOOST.
VISIT WORKSHOP!The EBB has detected a malfunction and
has switched off.
The brake system is still functioning nor-
mally but without the EBB available.Continue driving with added cau-
tion.
Have the system checked at an au-
thorized Mercedes-Benz Light Truck
Center as soon as possible.
Failure to follow these instructions in-
creases the risk of accident.
;(USA only)
! (Canada only)
PARK. BRAKE
RELEASE BRAKE!You are driving with the parking brake
set.Release the parking brake
(
page 50).

307 Practical hints
What to do if …
Display symbolDisplay messagePossible causePossible solution
B COOLANT
CHECK LEVEL!The coolant level is too low.Add coolant (page 248).
If you have to add coolant frequently,
have the cooling system checked by
an authorized Mercedes-Benz Light
Truck Center.
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 could 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 serious
engine damage.
Observe the coolant temperature dis-
play (
page 120).

308 Practical hints
What to do if …
During severe operating conditions and
stop-and-go city traffic, the coolant tem-
perature may rise close to 248°F (120°C).
Display symbolDisplay messagePossible causePossible solution
ÏCOOLANT
STOP, ENGINE OFF!The coolant is too hot. Stop the vehicle and turn off the en-
gine.
Only start the engine again after the
message disappears. You could other-
wise 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 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.

309 Practical hints
What to do if …
Display symbolDisplay messagePossible causePossible solution
ÏCOOLANT
STOP, ENGINE OFF!The poly-V-belt could be broken. Stop the vehicle and immediately turn
off the engine.
Check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise
the engine will overheat due to an
inoperative water pump which may re-
sult in damage to the engine. Notify an
authorized Mercedes-Benz Light Truck
Center.
If it is in order:
Do not continue to drive the vehicle
with this message displayed. Doing so
could result in serious engine damage
that is not covered by the
Mercedes-Benz Limited Warranty.
Observe the coolant temperature
display (
page 120).
Drive immediately to the nearest au-
thorized Mercedes-Benz Light Truck
Center.

310 Practical hints
What to do if …
ÏCOOLANT
VISIT WORKSHOP!The cooling fan for the coolant is
malfunctioning.Observe the coolant temperature dis-
play (
page 120).
Have the fan replaced as soon as pos-
sible.
ÑCRUISE CONTROL
VISIT WORKSHOP!Cruise control is malfunctioning.Visit an authorized Mercedes-Benz
Light Truck Center.
JDOOR OPEN!You are attempting to drive with one ore
more doors open.Close the doors.
eENGINE AIR FILTER
VISIT WORKSHOP!The engine air filter is clogged and must
be replaced.Visit an authorized Mercedes-Benz
Light Truck Center as soon as possi-
ble.
Display symbolDisplay messagePossible causePossible solution

311 Practical hints
What to do if …
When the ADD 1.0 QT. ENG. OIL - WHEN
NEXT REFUELLING!
(Canada: 1.0 LITER)
message appears while the engine is run-
ning and at operating temperature, the en-
gine oil level has dropped to approximately
the minimum level.When this occurs, the warning will first
come on intermittently and then stay on if
the oil level drops further.
Visually check for oil leaks. If no obvious oil
leaks are noted, drive to the nearest ser-
vice station where the engine oil should be
topped to the required level with an ap-
proved oil specified in the Factory
Approved Service Products pamphlet.
Display symbolDisplay messagePossible causePossible solution
: USA only:
ADD 1.0 Qt. ENGINE OIL
WHEN NEXT REFUELING!
Canada only:
ADD 1.0 LITER ENG. OIL
WHEN NEXT REFUELING!
The engine oil level is too low.Add engine oil (page 247) and check
the engine oil level (
page 244).
!
The engine oil level warnings should
not be ignored. Extended driving with
the symbol displayed could result in
serious engine damage that is not
covered by the Mercedes-Benz Limited
Warranty.