2004 MERCEDES-BENZ C240 4MATIC battery

89 Controls in detail
Locking and unlocking
Separately locking the trunkThe lock is located next to the recessed
handle.
1Neutral position
2Locked

Close the trunk lid (
page 87).

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

Insert the mechanical key in the trunk
lid lock.

Turn the mechanical key clockwise to
position2.
The trunk remains locked even when the
vehicle is centrally unlocked.
iThe emergency release button does
not open the trunk lid if the vehicle
battery is discharged or disconnected.iIf the emergency release button is
pressed and the vehicle was centrally
locked, the exterior lamps will flash and
the alarm will sound as the trunk lid
opens.
To cancel the alarm, do one of the
following:

Press buttonŒ or‹ on the
SmartKey.


Insert the SmartKey in the starter
switch.
iYour vehicle may be equipped with a
function permitting the separate lock-
ing of the trunk using the mechanical
key. If present, this feature can permit
you to deny any unauthorized person
access to the trunk by locking the trunk
separately and leaving the SmartKey
less the mechanical key with the
vehicle.
To verify the presence of this feature,
use the mechanical key to lock the
trunk and then attempt to open the
trunk by pulling on the trunk lid handle
after the vehicle has been centrally
unlocked with the SmartKey.

153 Controls in detail
Good visibility
Rear window defroster
The rear window defroster uses a large
amount of power. To keep the battery
drain to a minimum, switch off the
defroster as soon as the rear window is
clear. The defroster is automatically
deactivated after approximately
6 to 17 minutes of operation depending on
the outside temperature.
Activating
Climate control:
Press buttonF (
page 155).
Automatic climate control*:
Press buttonF (page 163).
The indicator lamp on the button
comes on.Deactivating

Press buttonF again.
The indicator lamp on the button goes
out.Warning!
G
Any accumulation of snow and ice should be
removed from the rear window before
driving. Visibility could otherwise be
impaired, endangering you and others.
!If the rear window defroster switches
off too soon and the indicator lamp
starts flashing, this means that too
many electrical consumers are
operating simultaneously and there is
insufficient voltage in the battery. The
system responds automatically by
deactivating the rear window defroster.
As soon as the battery has sufficient
voltage, the rear window defroster
automatically turns itself back on.

171 Controls in detail
Automatic climate control*
Residual heat and ventilation
With the engine switched off, it is possible
to continue to heat or ventilate the interior
for up to 30 minutes. This feature makes
use of the residual heat produced by the
engine.
Activating
Turn the SmartKey in the starter switch
to position1 or0, or remove it from
the starter switch.

Press button° (
page 163).
The indicator lamp on the button
comes on.Deactivating

Press button° (
page 163).
The indicator lamp on the button goes
out.
The residual heat is automatically turned
off:


when the ignition is switched on


after about 30 minutes


if the battery voltage drops
iHow long the system will provide
heating depends on the coolant
temperature and the temperature set
by the operator. The blower will run at
speed setting1 regardless of the air
distribution control setting.

202 Controls in detailPower windowsOpening and closing the windows with
the SmartKey
The sliding/pop-up roof* (
page 204) 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
resynchronized each time

after the battery has been
disconnected.


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

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.

205 Controls in detail
Sliding/pop-up roof*
Opening (Summer opening feature)
Press and hold buttonΠafter
unlocking the vehicle.
The windows and the sliding/pop-up
roof begin to open after approximately
one second.

Release theΠbutton to stop
procedure.Closing (Convenience feature)

Press and hold button‹ after
locking the vehicle.
The windows and the 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 the sliding/pop-up roof
The power sliding/pop-up roof must be
resynchronized each time

after the battery has been
disconnected.


after the sliding/pop-up roof has been
closed manually.


if the sliding/pop-up roof does not
open smoothly.


after a malfunction.
Synchronizing

Switch on ignition.

Press and hold the switch in
direction1 until the sliding/pop-up
roof is fully raised at the rear.
Hold the switch for approximately one
second.
The sliding/pop-up roof is adjusted.

223 Controls in detail
Useful features
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.Shortly after the completion of your Tele
Aid acquaintance call, you will receive a
user ID and password via first call mail. By
visiting www.mbusa.com and selecting
“Tele Aid” (USA only), you will have access
to account information, remote door
unlock, Info Services profile and more.
!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).
iThe SOS button is located above the
interior rear view mirror.
The Roadside Assistance button•
and the Information button¡ are
located below the center armrest
cover.!The Tele Aid system utilizes the cellular
network for communication and the
GPS (Global Positioning System) satel-
lites for vehicle location. If either of
these signals are unavailable, the
Tele Aid system may not function and if
this occurs, assistance must be sum-
moned by other means.

258 OperationEngine compartmentBattery
Your vehicle’s battery is located in the
engine compartment (
page 323).
The battery should always be sufficiently
charged in order to achieve its rated
service life. Refer to Service Booklet for
battery maintenance intervals.
If you use your vehicle mostly for short-dis-
tance trips, you will need to have the bat-
tery charge checked more frequently.
When replacing the battery, always use
batteries approved by Mercedes-Benz.
If you do not intend to operate your vehicle
for an extended period of time, consult an
authorized Mercedes-Benz Center about
steps you need to observe.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.
G
Observe all safety instructions
and precautions when handling
automotive batteries.
A
Risk of explosion
D
Keep flames or sparks away
from battery. Do not smoke.
B
Battery acid is caustic. Do not
allow it to come into contact
with skin, eyes or clothing.
In case it does, immediately
flush affected area with clear
water and seek medical help if
necessary.
E
Wear eye protection.
C
Keep children away.
F
Follow the instructions in this
Operator's Manual.

263 Operation
Winter driving
Winter driving
Before the onset of winter, have your
vehicle winterized at an authorized
Mercedes-Benz Center. This service
includes:

Check of anticorrosion and antifreeze
concentration.


Addition of cleaning concentrate to the
water of the windshield and headlamp
cleaning system. Add MB Concentrate
“S” to a premixed windshield washer
solvent/antifreeze which is formulated
for below freezing temperatures
(page 358).


Battery test. Battery capacity drops
with decreasing ambient temperature.
A well charged battery helps to ensure
that the engine can be started, even at
low ambient temperatures.


Tire change. Mercedes-Benz recom-
mends M+S rated radial-ply tires with a
minimum tread depth of approximately 1/6in (4 mm) on all four wheels for the
winter season.
Winter tires
Always use winter tires at temperatures
below 45°F (7°C) and whenever wintry
road conditions prevail. Use of winter tires
is the only way to achieve the maximum
effectiveness of the ABS, ESP and 4MATIC
in winter operation.
For safe handling, ensure that all mounted
winter tires are of the same make and have
the same tread design.Always observe the speed rating of the
winter tires installed on your vehicle. If the
maximum speed for which your tires are
rated is below the speed rating of your
vehicle, you must place a notice to this
effect where it will be seen by the driver.
Such notices are available from your tire
dealer or from any authorized
Mercedes-Benz Center.Warning!
G
Winter tires with a tread depth under
1/6in
(4 mm) must be replaced. They are no
longer suitable for winter operation.
Warning!
G
If you use your spare tire when winter tires
are fitted on the other wheels, be aware that
the difference in tire characteristics may
very well impair turning stability and that
overall driving stability may be reduced.
Adapt your driving style accordingly.
Have the spare tire replaced with a winter
tire at the nearest authorized
Mercedes-Benz Center.