2004 MERCEDES-BENZ SL55AMG replace battery

92 Controls in detailLocking and unlockingRestoring to factory setting
Press and hold buttons Œ and ‹
simultaneously for about six seconds
until battery check lamp5
(page 90) flashes twice.
Unlocking the trunk lid
You can unlock the trunk separately.
A minimum height clearance of
6.2 ft (1.88 m) is required to open the
trunk lid.

Press and hold button Š until trunk
unlocks.Checking the batteries

Press button ‹ or Œ.
Battery check lamp5 (
page 90)
comes on briefly to indicate that the
SmartKey batteries are in order.
!If you can no longer lock or unlock the
vehicle with the SmartKey, then the
batteries in the SmartKey are dis-
charged, the SmartKey is malfunction-
ing or the vehicle battery is drained.

Check the batteries in the
SmartKey (
page 92) and replace
them if necessary (
page 328).


Use the mechanical key to unlock
the doors (
page 325).


Have the vehicle batteries and their
connections checked
(page 358).


Use the mechanical key to lock or
unlock the doors (
page 327) .
If the SmartKey is malfunctioning, con-
tact an authorized Mercedes-Benz
Center.
iIf the vehicle was previously centrally
locked, the trunk lid will lock automati-
cally when closed. The turn signals will
flash three times to confirm locking.
!If battery check lamp5 does not
come on briefly during check, then the
SmartKey batteries are discharged.

Replace the batteries (
page 328).
You can obtain the required batteries
at any authorized Mercedes-Benz
Center.
iIf the batteries are checked within sig-
nal range of the vehicle, pressing
the‹ orŒ button will lock or
unlock the vehicle accordingly.

93 Controls in detail
Locking and unlocking
Loss of SmartKey or mechanical key
If you lose a SmartKey or mechanical key,
you should do the following:
Have the SmartKey deactivated by an
authorized Mercedes-Benz Center.

Report the loss of the SmartKey or the
mechanical key to your car insurance
company immediately.

If necessary, have the mechanical lock
replaced.
Your authorized Mercedes-Benz Center
will be glad to supply you with a replace-
ment.
SmartKey with KEYLESS-GO*
Vehicles equipped with KEYLESS-GO*
come with two SmartKeys with
KEYLESS-GO, each with remote controls
and a removable mechanical key. The lock-
ing tabs for the mechanical key portion of
the two SmartKeys are a different color to
help distinguish each SmartKey unit.
The KEYLESS-GO function is integrated
into the SmartKey. On these vehicles, the
validity of the SmartKey with KEYLESS-GO
is checked every time you grasp a door
handle.
If the SmartKey with KEYLESS-GO is valid,
your vehicle unlocks

the doors


the trunk lid


the glove box


the storage compartment under the
armrest


the storage compartment in the rear


the fuel filler flap
SmartKey with KEYLESS-GO1‹Lock button
2Š Unlock button for the trunk lid
3Mechanical key locking tab
4ŒUnlock button
5Battery check lamp
6Â Panic button (
page 74)
For information on using the SmartKey
buttons, see “SmartKey” (page 90).

96 Controls in detailLocking and unlockingFactory setting
Global unlocking
Grasp the door handle.
The vehicle will lock again automatically
within approximately 40 seconds of un-
locking if neither door nor trunk is opened.
Global locking

Press lock button at door handle
(page 55) or trunk (
page 98).Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey with
KEYLESS-GO so that grasping a door han-
dle only unlocks the driver’s door, interior
lockable storage compartments and the
fuel filler flap.

Press and hold buttons Œ and ‹
simultaneously for about six seconds
until battery check lamp5
(page 90) flashes twice.
The SmartKey with KEYLESS-GO will
then function as follows:
Unlocking the driver’s door

Grasp the driver’s door handle.
Global unlocking

Grasp the door handle on the passen-
ger side.
Global locking

Press lock button at door handle or
trunk lid.Restoring to factory setting

Press and hold buttons Œ and ‹
simultaneously for about six seconds
until battery check lamp5
(page 93) flashes twice.
iThe vehicle could inadvertently unlock
if the SmartKey with KEYLESS-GO is
within 3 ft (1 m) of the vehicle and

the door handle is splashed with
water
or


you attempt to clean the door
handle
!If you can no longer lock or unlock the
vehicle with the SmartKey with
KEYLESS-GO, then the battery in the
SmartKey is discharged, the SmartKey
with KEYLESS-GO is malfunctioning or
the vehicle battery is drained.

Check the battery in the SmartKey
with KEYLESS-GO (
page 92) and
replace it if necessary
(
page 328).


Use the mechanical key to unlock
the doors (
page 325).

98 Controls in detailLocking and unlockingLocking the vehicle
1Trunk lock button
Press trunk lock button 1 or the lock
button on the door handle (
page 55).Checking the battery

Press button ‹ or Œ.
Battery check lamp5 (
page 93)
comes on briefly to indicate that the
SmartKey batteries are in order.Loss of SmartKey with KEYLESS-GO
If you lose your SmartKey with
KEYLESS-GO, you should do the following:

Have the SmartKey with KEYLESS-GO
deactivated by an authorized Mer-
cedes-Benz Center.

Report the loss of the SmartKey with
KEYLESS-GO or the mechanical key to
your car insurance company immedi-
ately.

Have the mechanical lock replaced if
necessary.
Your authorized Mercedes-Benz Center
will be glad to supply you with a replace-
ment.
!If battery check lamp5 (
page 93)
does not come on briefly during check,
then the SmartKey battery is dis-
charged.


Replace the battery (
page 328).
You can obtain the required battery at
any authorized Mercedes-Benz Center.

268 OperationWinter driving
Winter drivingBefore the onset of winter, have your vehi-
cle winterized at an authorized
Mercedes-Benz Center. This service in-
cludes:

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 pre-mixed windshield washer
solvent / antifreeze which is formulated
for temperatures below freezing point
(page 392).


Battery test. Battery capacity drops
with decreasing ambient temperature.
A well charged battery helps to ensure
that the engine can be started and the
SBC brake system will be fully opera-
tional even at low ambient tempera-
tures.


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 ef-
fectiveness of the ABS and ESP in winter
operation.
For safe handling, make sure all winter
tires mounted are of the same make and
have the same tread design.
!When scraping ice or snow from the
rear window, be careful not to damage
the sealing strip or apertures along the
side of the window.
Warning!
G
Winter tires with a tread depth of less than 1/6in (4 mm) must be replaced. They are no
longer suitable for winter operation.

298 Practical hintsWhat to do if …Left display
Right display
Possible cause
Possible solution
#
Visit
workshop!
There is a malfunction in the elec-
tronic system.

Have the system checked at an authorized
Mercedes-Benz Center as soon as possible.
#
Electric
consumers
offline!
The consumer battery has insuffi-
cient voltage and can no longer sup-
ply the convenience functions such
as seat ventilation*.
The electrical consumers will come back online
as soon as on-board voltage is sufficient.
2
Brake lining wear!
Visit
workshop!
The brake pads have reached their
wear limit.

Have the brake pads replaced as soon as pos-
sible.
!Brake pad thickness must be visually
checked by a qualified technician at the
intervals specified in the Service
Booklet.

328 Practical hintsLocking/unlocking in an emergency
Using the hex-socket wrench provided
in the vehicle tool kit, carefully turn the
locking screw 2 approximately one
quarter turn.

Hook luggage cover into holders
(page 185).

Let go of the hardtop.
It should gradually lower into the trunk.

When top is completely lowered, return
locking screw 2 to its original posi-
tion.

Close the lid.

Replace the trunk floor.

Visit an authorized Mercedes-Benz
Center as soon as possible.Replacing batteries in the SmartKey/
SmartKey with KEYLESS-GO*
If the batteries in the SmartKey or the
SmartKey with KEYLESS-GO* 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 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.SmartKey
1Mechanical key
2Battery compartment
Replacement batteries: Lithium, type
CR 2025 or equivalent.
!Do not overtighten the screw.
Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.
iWhen replacing batteries, always re-
place both batteries. The required re-
placement batteries are available at
any Mercedes-Benz Center.


329 Practical hints
Locking/unlocking in an emergency

Remove mechanical key (
page 325).

Insert the mechanical key1in side
opening and push gray slide.
The battery compartment is unlatched.

Pull battery compartment2out of the
SmartKey housing in direction of ar-
row.

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 it locks into place.SmartKey with KEYLESS-GO*
1Battery
2Tilt battery up
3Mechanical key
Replacement batteries: Lithium, type
CR 2025 or equivalent.
iThe required replacement batteries are
available at any Mercedes-Benz
Center.