2004 MERCEDES-BENZ C320 4MATIC WAGON battery

273 Practical hints
What to do if …
Where will I find ...?
Unlocking/locking in an emergency
Opening/closing in an emergency
Replacing bulbs
Replacing wiper blades
Flat tire
Battery
Jump starting
Towing the vehicle
Fuses

274 Practical hintsWhat to do if …
What to do if …Lamps in instrument clusterGeneral information:
If a bulb in the instrument cluster fails to
come on during the bulb self-check when turning the SmartKey in the starter switch
to position2, have it checked and replaced
if necessary.Problem
Possible cause
Suggested solution
-
The yellow ABS malfunction
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 brake system is still functioning normally
but without the ABS available.

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
increases the risk of an accident.

Read and observe messages in the
display (
page 280).
The charging voltage has fallen below ten
volts. The ABS has switched off.

When the voltage is above this value
again, the ABS is operational again.

If necessary, have the generator
(alternator) and battery checked.

281 Practical hints
What to do if …
Text messagesDisplay message
Possible cause
Possible solution
BAS
BRAKE ASSIST
NOT AVAILABLE!
The charging voltage has fallen below ten
volts. The BAS has switched off.

When the voltage is above this value
again, the BAS is operational again.

If necessary, have the generator and
battery checked.
BRAKE ASSIST
VISIT WORKSHOP!
The BAS has detected a malfunction and
switched off. The brake system is still
functioning normally but without the BAS
available.

Continue driving with added caution.

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.
DISPLAY MALFUNCTION
VISIT WORKSHOP!
The BAS or the BAS display is
malfunctioning.

Continue driving with added caution.

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.

283 Practical hints
What to do if …
Display message
Possible cause
Possible solution
ESP
ESP
NOT AVAILABLE!
The charging voltage has fallen below ten
volts. The ESP has switched off.

When the voltage is above this value
again, the ESP is operational again.

If necessary, have the generator and
battery checked.
ESP
VISIT WORKSHOP!
The ESP is deactivated because of a
malfunction.

Continue driving with added caution.

Visit an authorized Mercedes-Benz
Center as soon as possible.
Failure to follow these instructions
increases the risk of an accident.
DISPLAY MALFUNCTION
VISIT WORKSHOP!
The ESP or the ESP display is
malfunctioning.

Continue driving with added caution.

Visit an authorized Mercedes-Benz
Center as soon as possible.
Failure to follow these instructions
increases the risk of an accident.

285 Practical hints
What to do if …
Display symbol
Display message
Possible cause
Possible 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
inoperative water pump which may
result in damage to the engine. Notify
an authorized Mercedes-Benz Center.
If it is intact:

Drive immediately to the nearest
authorized Mercedes-Benz Center.
UNDERVOLTAGE
ENGINE ON!
The battery has insufficient voltage and
can no longer supply the convenience
functions such as seat heater*.

Start the engine (
page 43).
UNDERVOLTAGE
SWITCH CONSUMERS OFF!
The battery is malfunctioning.

Have the battery checked at a service
station.

306 Practical hintsUnlocking/locking in an emergencyUnlocking the tailgate
A minimum height clearance of 6.40 ft
(1.95 m) is required to open the tailgate.
The emergency release is located on the
inside of the tailgate.
1Release lever
2Cover
Remove cover2 from the trim on the
tailgate.

Push release lever1 all the way to the
right.

Open the tailgate.
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
tailgate.

Press the central locking switch in the
cockpit (
page 89).

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

Slide mechanical key out of the
SmartKey (
page 305).

Lock the driver’s door with the
mechanical key (
page 305).
Changing batteries in the SmartKey
If the batteries in the SmartKey are
discharged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced at an
authorized Mercedes-Benz 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.
!The tailgate swings open upwards
automatically. Always make sure there
is sufficient overhead clearance.
Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.

307 Practical hints
Unlocking/locking in an emergency
1Mechanical key
2Battery compartment
Replacement batteries: Lithium, type
CR 2025 or equivalent.

Remove mechanical key1
(page 305).

Insert mechanical key1 in side
opening and push grey slide.
Battery compartment2 is unlatched.

Pull battery compartment2 out of the
SmartKey housing in direction of
arrow.
3Battery
4Contact spring

Remove the batteries.

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

Return battery compartment2 into
housing until it locks into place.

Slide mechanical key1 back into the
SmartKey.
iWhen changing batteries, always
replace both batteries.
The required replacement batteries are
available at any Mercedes-Benz
Center.
iWhen inserting the batteries, make
sure they are clean and free of lint.

324 Practical hintsBattery
BatteryThe battery is located in the engine
compartment on the right hand side.
Removal of filter box:
Release the three clamps1.

Remove filter box.
Installation of filter box:

Insert filter box properly.

Secure it with the three clamps1.
Warning!
G
Failure to follow these instructions can
result in severe injury or death.
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.
!Never loosen or detach battery termi-
nal clamps while the engine is running
or the SmartKey is in the starter switch.
Otherwise the alternator and other
electronic components could be se-
verely damaged.
Have the battery checked regularly by
an authorized Mercedes-Benz Center.
Refer to Service Booklet for mainte-
nance intervals or contact your autho-
rized Mercedes-Benz Center for further
information.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.