2004 MERCEDES-BENZ C240 4MATIC WAGON key battery

198 Controls in detailPower windowsOpening and closing the windows with
the SmartKey
The sliding/pop-up roof* (
page 200) will
also be opened or closed when the power
windows are operated with the SmartKey .

Aim transmitter eye at the driver’s door
handle.Opening (Summer opening feature)

Press and hold buttonΠafter
unlocking the vehicle.
The windows and sliding/pop-up roof*
begin to open after approximately one
second.

Release the Œbutton to stop
procedure.
Closing (Convenience feature)

Press and hold button‹ after
locking the vehicle.
The windows and sliding/pop-up roof*
begin to close after approximately one
second.

Release the ‹button to stop
procedure.
Make sure all side windows and the
sliding/pop-up roof* are properly closed
before leaving the vehicle.
Synchronizing power windows
The power windows must be resynchro-
nized each time

after the battery has been
disconnected.


if the power windows cannot be fully
opened (Express-open) or closed
(Express-close).
Synchronizing the power windows

Switch on ignition.

Pull the power window switches until
the side windows are closed.
Hold the switches for approximately
one second.
The power windows are adjusted.
Warning!
G
Never operate the windows or
sliding/pop-up roof* if there is the
possibility of anyone being harmed by the
opening or closing procedure.
In the event that the procedure causes
potential danger, the procedure can be
immediately halted by releasing the
transmit button on the SmartKey. To reverse
direction of movement, press buttonŒ
for opening or‹ for closing.

222 Controls in detailUseful featuresYou can take and place telephone calls
using theí andì buttons on the
steering wheel. To carry out other tele-
phone functions, use the control system
(page 136).
See separate operating manual for instruc-
tions on how to use the telephone.
Tele Aid* The Tele Aid system
(Tele
matic A
larm I
dentification on
D
emand)
The Tele Aid system consists of three
types of response:

automatic and manual emergency


roadside assistance and


information
The Tele Aid system is operational provid-
ing that the vehicle’s battery is charged,
properly connected, not damaged and
cellular and GPS coverage is available.
The speaker volume of a Tele Aid call can
be adjusted when using the volume control
on the multifunction steering wheel. To
raise, press buttonæ and to lower,
press buttonç.

To activate, press the SOS button, the
Roadside Assistance button• or
the Information button¡, depend-
ing on the type of response required.
Warning!
G
Some jurisdictions prohibit the driver from
using a cellular telephone while driving a
vehicle. Whether or not prohibited by law,
for safety reasons, the driver should not use
the cellular telephone while the vehicle is in
motion.
Stop the vehicle in a safe location before
answering or placing a call.
!The initial activation of the Tele Aid
system may only be performed by
completing the subscriber agreement
and placing an acquaintance call using
the SOS button. Failure to complete
either of these steps will result in a
system that is not activated. If the
system is not activated, the indicator
lamp in the SOS button stays on after
turning SmartKey in starter switch to
position2 and the message
TELE AID
EMERG. CALL – NOT ACTIVATED
will be
shown in the multifunction display for
approximately ten seconds.
If you have any questions regarding
activation, please call the Response
Center at 1-800-756-9018 (in the USA)
or 1-888-923-8367 (in Canada).

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.

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.

325 Practical hints
Battery
1Negative terminal
2Positive terminal cover
Disconnecting the battery
Turn off all electrical consumers.

Open the hood (
page 252).

Remove the filter box (
page 324).

Disconnect battery negative lead1.

Remove cover2 from positive
terminal.

Disconnect the battery positive lead.
Removing the battery
Remove the screw-nuts securing the
battery.

Remove the battery bracket.

Take out the battery.
Charging and reinstalling the battery
Charge battery in accordance with the
instructions of the battery charger
manufacturer.

Reinstall the charged battery. Follow
the previously described steps in
reverse order.
Warning!
G
With a disconnected battery

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


the gear selector lever will remain
locked in positionP
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.

331 Practical hints
Towing the vehicle
Warning!
G
With the engine not running, there is no
power assistance for the brake and steering
systems. In this case, it is important to keep
in mind that a considerably higher degree of
effort is necessary to brake and steer the ve-
hicle. Adapt your driving accordingly.
!When towing the vehicle with all wheels
on the ground, please note the
following:
With the automatic central locking
activated and the SmartKey in starter
switch position2, the vehicle doors
lock if the left front wheel as well as the
right rear wheel are turning at vehicle
speeds of approx. 9 mph (15 km/h) or
more.
Switch off the tow-away alarm
(page 81).
To prevent the vehicle doors from
locking, deactivate the automatic
central locking (
page 131).
Towing of the vehicle should only be
done using the properly installed
towing eye bolt. Never attach tow
cable, tow rope or tow rod to vehicle
chassis, frame or suspension parts.
iIf the battery is disconnected or
discharged

the SmartKey will not turn in the
starter switch. See notes on the
battery (
page 324) or on jump
starting (page 327).


the gear selector lever will remain
locked in positionP. See notes on
manually unlocking transmission
gear selector lever (
page 308).