2003 MERCEDES-BENZ G55AMG battery

240 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
-
The yellow ABS malfunction indi-
cator lamp comes on while driv-
ing.
You engaged the differential locks. The ABS,
ESP, BAS, EBB and 4-ETS are switched off.

The driving systems will switch on
again after the differential locks have
been disengaged.
The ABS has detected a malfunction and has
switched off. The ESP, BAS, EBB and 4-ETS
are also switched off (see messages in dis-
play).
If the ABS control unit is malfunctioning, oth-
er systems such as the navigation system or
Rear Park Assist* may also malfunction.
The brake system is still functioning normally
but without the ABS available.

Continue driving with added caution.
Wheels will lock during hard braking
reducing steering capability.

Have the system checked at an autho-
rized Mercedes-Benz Light Truck Cen-
ter as soon as possible.
Failure to follow these instructions in-
creases the risk of an accident.
The ABS has switched off because charging
voltage has fallen below 10 volts. The battery
may not be charged.

Turn off unnecessary electric con-
sumers.
When the battery voltage is above this
value again, the ABS is operational
again.

Note the messages in the multifunc-
tion display (
page 246).

249 Practical hints
What to do if …
Display
Possible cause
Suggested solution
Category
#
BATTERY/ALTERNATOR
VISIT WORKSHOP!
The battery was charged with a bat-
tery charger or jump started.

Have the battery checked at a
service station.
2
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. Oth-
erwise the engine will overheat
due to an inoperative water
pump which may result in seri-
ous engine damage not cov-
ered by the Mercedes-Benz
Limited Warranty. Notify an
authorized Mercedes-Benz
Light Truck Center.
If it is intact:

Turn off unnecessary electric
consumers.

Drive immediately to the near-
est authorized Mercedes-Benz
Light Truck Center.

257 Practical hints
What to do if …
ESP
ELEC. STABIL. PROG.
NOT AVAILABLE
The ESP is deactivated because of a
malfunction or interrupted power
supply. The ABS might not be opera-
tional.
The system must be resynchronized.

With vehicle stationary and the
engine running, turn the steer-
ing wheel completely to the
left and then to the right to
synchronize 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 possible.
Failure to follow these instructions
increases the risk of accident.
2
The ESP is temporarily unavailable.
The self-diagnosis has not been
completed.
The display will clear itself after
driving a short distance at more
than 12 mph (20 km/h).
The charging voltage has fallen be-
low 10 volts and the ESP has
switched off.

When the voltage is above this
value again, the ESP is opera-
tional again.

If necessary, have the genera-
tor and battery checked.
2
Display
Possible cause
Suggested solution
Category

266 Practical hintsWhat to do if …Display
Possible cause
Suggested solution
Category
§
TC SHIFT
CANCELLED
The shift process in the transfer
case was cancelled because of a
malfunction.

Repeat the shift process
(page 141).
2
§
TC SHIFT CONDITIONS
NOT FULFILLED
You have not met the shift condi-
tions for a selection process in the
transfer case.

Repeat the shift process
(page 141).
2
§
TRANSFER CASE
VISIT WORKSHOP!
The transfer case is malfunctioning.

Do not switch the transfer
case on.

Visit an authorized
Mercedes-Benz Light Truck
Center as soon as possible.
2
L
TELE AID
VISIT WORKSHOP!
One or more main functions of the
Tele Aid system are malfunctioning.

Have the Tele Aid system
checked by an authorized Mer-
cedes-Benz Light Truck Cen-
ter.
1
Ê
TRUNK OPEN!
This message will appear whenever
the tailgate is open.

Close the tailgate.
2
#
UNDERVOLTAGE
ENGINE ON!
The battery has insufficient voltage.

Start the engine.
1
UNDERVOLTAGE
SWITCH CONSUMER OFF!
The battery has insufficient voltage.

Have the battery checked at a
service station.
1

273 Practical hints
Unlocking/locking in an emergency
Locking the vehicle
If you are unable to lock the vehicle with
the SmartKey, lock it with the mechanical
key as follows:
Close the passenger doors and the tail-
gate.

Press the central locking switch in the
cockpit (
page 90).

Check to see whether the locking
knobs on the passenger doors are still
visible. If necessary, push them down
manually.

Slide the mechanical key out of the
SmartKey.

Lock the driver’s door with the me-
chanical key.

Lock the tailgate if necessary with the
mechanical key.
Changing batteries in the SmartKey
If the batteries in the SmartKey are dis-
charged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced at an autho-
rized Mercedes-Benz Light Truck Center.
Batteries contain materials that can harm
the environment if disposed of improperly.
Recycling of batteries is the preferred
method of disposal. Many states require
sellers of batteries to accept old batteries
for recycling.1Mechanical key
2Battery compartment
Replacement batteries:
Lithium, type CR 2025 or equivalent.Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.
iWhen changing batteries, always re-
place both batteries.
The required replacement batteries are
available at any Mercedes-Benz Light
Truck Center.

274 Practical hintsUnlocking/locking in an emergency
Remove mechanical key1
(page 272).

Insert the mechanical key in side open-
ing and push briefly gray slide.
Battery compartment2 is unlatched.

Pull battery compartment2 out of the
key housing in direction of arrow.

Remove the batteries.
3Battery
4Contact spring

Using a lint-free cloth, insert new bat-
teries under the contact spring with the
plus (+) side facing up.

Return battery compartment into hous-
ing until locked in place.

Slide mechanical key1 back into the
SmartKey.
Fuel filler flap
The emergency release is in the cargo area
behind the rear panel trim.
1Edge protection
2Rear panel trim
Open the tailgate.

Remove edge protection1 from the
door pillar.

Remove rear panel trim2.
iWhen inserting the batteries, make
sure that they are clean and free of lint.


295 Practical hints
Battery
Battery
The battery is located in front of the rear
seat bench and below the cup holder
Batteries contain materials that can harm
the environment if disposed of improperly.
Large 12-volt storage batteries contain
lead.
Recycling of batteries is the preferred
method of disposal. Many states require
sellers of batteries to accept old batteries
for recycling.
Charging the battery
Have the battery removed at a
Mercedes-Benz Light Truck Center.
If you charge the battery yourself, make
sure to comply with the operating instruc-
tions for your battery charger.
Warning!
G
Failure to follow these instructions can re-
sult in severe injury or death.
Observe all safety instructions and precau-
tions when handling automotive batteries
(page 223).
Never lean over batteries while connecting,
you might get injured.
Battery fluid contains sulfuric acid. Do not
allow this fluid to come in contact with eyes,
skin or clothing. In case it does, immediately
flush affected area with water and seek
medical help if necessary.
A battery will also produce hydrogen gas,
which is flammable and explosive. Keep
flames or sparks away from battery, avoid
improper connection of jumper cables,
smoking etc.
Warning!
G
Do not place metal objects on the battery as
this could result in a short circuit.
Use leak-proof battery only to avoid the risk
of acid burns in the event of an accident.
Warning!
G
Never charge a battery while still installed in
the vehicle. Gases may escape during charg-
ing and cause explosions that may result in
paint damage, corrosion or personal injury.!Have the battery checked regularly by
an authorized Mercedes-Benz Light
Truck Center.
Refer to Service Booklet for mainte-
nance intervals or contact your autho-
rized Mercedes-Benz Light Truck
Center for further information.

296 Practical hintsBatteryDisconnecting the battery
Turn off all electrical consumers.

Disconnect the battery negative lead.

Remove the cover from the positive ter-
minal.

Disconnect the battery positive lead.

Remove the breather hose from the
battery.
Reconnecting the battery
Turn off all electrical consumers.

Connect the positive lead and fasten its
cover.

Connect the negative lead.

Install the breather hose.
!Never loosen or detach battery termi-
nal clamps while the engine is running
or the key is in the starter switch. Oth-
erwise the alternator and other elec-
tronic components could be severely
damaged.
iWith a disconnected battery

you will no longer be able to turn
the key in the starter switch


the selector lever will remain
locked in positionP
!Never invert the terminal connections.!The battery, its filler caps and the vent
tube must always be securely installed
when the vehicle is in operation.
iThe following procedures must be car-
ried out following any interruption of
battery power (e.g. due to reconnec-
tion):

Set the clock (see COMAND opera-
tor’s manual).


Resynchronize the front seat head
restraints and seat adjustment fore,
aft (
page 93).


Resynchronize the ESP
(page 257).