2008 MERCEDES-BENZ SL55AMG keyless

405 Practical hints
Locking/unlocking in an emergency
Locking the vehicle
If you cannot lock the vehicle with the
SmartKey, lock it with the mechanical key
as follows:
Close the passenger door and the
trunk.
Press the central locking switch in the
center console (
page 122).
Check whether the locking knob on the
passenger door has moved down.
If necessary push it down manually.
Remove the mechanical key from the
SmartKey (
page 403).
Check whether the trunk is locked.
If necessary, lock the trunk with the
mechanical key (
page 120).
Except for the driver’s door, the vehicle
should now be locked.
Insert mechanical key 2 into the
driver’s door lock until it stops.
Turn mechanical key 2 clockwise to
position 1.
The driver’s door is locked.
iUnlocking the glove box with the mechanical
key will trigger the anti-theft alarm system. To
cancel the alarm, do one of the following:

Press button Œ or ‹on the
SmartKey.

Insert the SmartKey in the starter switch.

Press the KEYLESS-GO* start/stop button
(
page 41).

Grasp an outside door handle (vehicles with
KEYLESS-GO* only).
1Locking
2Mechanical key
iThis procedure does not arm the anti-theft
alarm system, nor does it lock the fuel filler flap
and the storage compartments.
The storage compartments can be locked
separately (
page 240).

407 Practical hints
Replacing SmartKey batteries
Replacing SmartKey batteries
If the batteries in the SmartKey or the
SmartKey with KEYLESS-GO* 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.Remove the mechanical key from the
SmartKey or SmartKey with
KEYLESS-GO* (
page 403).
1Mechanical key
2Battery compartment
Insert mechanical key 1 into opening.
Press mechanical key 1 in direction of
arrow.
The battery compartment is unlatched.
Pull battery compartment 2 out of the
housing.
Warning!G
Batteries contain poisonous and corrosive
substances. Therefore keep the batteries
out of reach of children.
If a battery is swallowed, seek medical help
immediately.
Warning!G
SmartKey batteries contain Perchlorate
material, which may require special handling
and regard for the environment. Check with
your local government’s disposal guidelines.
California residents, see
http://www.dtsc.ca.gov/HazardousWaste
/Perchlorate/index.cfm.
iWhen inserting batteries, make sure they
are clean and free of lint.
iWhen replacing batteries, always replace
both batteries.
The required replacement batteries (Lithium,
type CR 2025 or equivalent) are available at any
authorized Mercedes-Benz Center.


408 Practical hints
Replacing SmartKey batteries
3Batteries
4Contact spring
Pull out batteries3.
Using a lint-free cloth, insert new
batteries 3 under contact springs 4
with the positive terminal (+) side
facing up.
Return battery compartment 2 into
housing until it locks into place.
Slide mechanical key 1 back into
SmartKey or SmartKey with
KEYLESS-GO*.
Check the operation of the SmartKey
or SmartKey with KEYLESS-GO* as well
as the KEYLESS-GO* function.


415 Practical hints
Replacing wiper blades
Replacing wiper blades
Placing wiper arms in vertical position
Wiper blades in vertical position
Vehicles with SmartKey
Turn SmartKey to starter switch
position1 (
page 40).
Turn combination switch to wiper
settingII (
page 58).
With wiper arms in the vertical position,
turn SmartKey in starter switch to
position0.
Remove SmartKey from starter switch.
Warning!G
For safety reasons, switch off wipers and re-
move SmartKey from starter switch
(vehicles with KEYLESS-GO*: Make sure the
vehicle’s on-board electronics have
status0) before replacing a wiper blade.
Otherwise the wiper motor could suddenly
turn on and cause injury.
Warning!G
Wiper blades are components that are sub-
ject to wear and tear. Replace the wiper
blades twice a year, preferably in the spring
and fall. Otherwise the windows will not be
properly wiped. As a result, you may not be
able to observe surrounding traffic condi-
tions and could cause an accident.
!To avoid damage to the hood:

The wiper arms should only be folded
forward when in the vertical position.

Never open the hood when a wiper arm is
folded forward.
!Hold on to the wiper when folding the wiper
arm back. If released, the force of the impact
from the tensioning spring could crack the wind-
shield.
Do not allow the wiper arms to contact the wind-
shield glass without a wiper blade inserted.
For your convenience, we recommend that you
have this work carried out by an authorized
Mercedes-Benz Center.

416 Practical hints
Replacing wiper blades
Vehicles with KEYLESS-GO*
Turn off the engine (page 64).
With the driver’s door closed, the
starter switch is now in position1.
Turn combination switch to wiper
settingII (
page 58).
With wiper arms in the vertical position,
open the driver’s door.
The starter switch is set to position0,
same as SmartKey removed from
starter switch.
Turn combination switch to wiper
setting0 (
page 58).
Removing wiper blades
Fold the wiper arm forward until it
snaps into place.
Turn wiper blade at a right angle to the
wiper arm.
Slide the wiper blade sideways out of
the retainer.
Installing wiper blades
Slide the wiper blade onto the wiper
arm in opposite direction of arrow.
Rotate the wiper blade into a position
parallel to the wiper arm.
Fold the wiper arm backward to rest on
the windshield. Make sure you hold on
to the wiper when folding the wiper arm
back.
!Do not pull on the wiper blade inserts. They
could tear.
!Make sure the wiper blades are properly
installed. Improperly installed wiper blades may
cause windshield damage.

417 Practical hints
Flat tire
Flat tire
Preparing the vehicle
Park the vehicle in a safe distance from
moving traffic on a hard, flat surface
when possible.
Turn on the hazard warning flashers.
Turn the steering wheel so that the
front wheels are in a straight ahead
position.
Set the parking brake (page 63).
Move the gear selector lever to
position P.
Turn off the engine (page 64).
Have any passenger exit the vehicle at
a safe distance from the roadway.
Vehicles with Smartkey: Remove the
SmartKey from the starter switch.
Vehicles with KEYLESS-GO*: Open the
driver’s door (this puts the starter
switch in position 0, same as with the
SmartKey removed from the starter
switch). The driver’s door then can be
closed again.Mounting the spare wheel
iOpen door only when conditions are safe to
do so.
Warning!G
The dimensions of the spare wheel are dif-
ferent from those of the road wheels. As a
result, the vehicle handling characteristics
change when driving with a mounted spare
wheel. Adapt your driving style accordingly.
The spare wheel is for temporary use only.
When driving with spare wheel mounted, en-
sure proper tire inflation pressure and do
not exceed vehicle speed of 50 mph
(80 km/h).
Drive to the nearest Mercedes-Benz Center
as soon as possible to have the spare wheel
replaced with a regular road wheel.
Never operate the vehicle with more than
one spare wheel mounted.
Do not switch off the ESP
® when a spare
wheel is mounted.

423 Practical hints
Flat tire
Insert electrical plug 3 into vehicle
cigarette lighter socket (
page 244)
or the power outlet in the trunk
(
page 246).
Turn the SmartKey in the starter switch
to position1.
or
Press the KEYLESS-GO* start/stop
button on the gear selector lever once
without depressing the brake pedal.
PressI on the electric air pump
switch2.
The electric air pump should now
switch on and inflate the tire.
Inflate the spare tire:

SL 550 to 36 psi (2.5 bar)

SL 600, SL 55 AMG, SL 55 AMG
(Performance Package*), and
SL 65 AMG to 51 psi (3.5 bar)
This takes about 5 minutes.
Air hose4 and union nut5 can be-
come hot during inflation. Exercise
proper caution to avoid burning your-
self when using the equipment.
Press0 on the electric air pump
switch2.
Turn the SmartKey in the starter switch
to position0.
or
Press KEYLESS-GO* start/stop button
on the gear selector lever twice without
depressing the brake pedal.
The electric air pump should now be
switched off.
If the spare tire inflation pressure is
above the recommended tire inflation
pressure for the respective collapsible
tire (
page 453), release excess spare
tire inflation pressure using the vent
screw.
!Compare the recommended tire inflation
pressure for your vehicle with the tire inflation
pressure on the yellow label located on the spare
wheel rim.
If the tire inflation pressure on the yellow label
on the spare wheel rim differs from the values
given in this Operator’s Manual, inflate the tire to
the recommended tire inflation pressure given
on the yellow label on the spare wheel rim.
!Do not operate the electric air pump longer
than 8 minutes without interruption. Otherwise it
may overheat.
You may operate the air pump again after it has
cooled off.


429 Practical hints
Batteries
Disconnecting the batteries
Apply the parking brake (page 63).
Make sure the gear selector lever is set
to position P (
page 172).
Close the retractable hardtop
(
page 204).
Turn off all electrical consumers.
Turn off the engine (page 64).
Remove the SmartKey from the starter
switch.
Vehicles with KEYLESS-GO*: Open
the driver’s door.
Open the trunk.
Read and observe safety instructions
and precautions (
page 290).
Open the luggage cover in the trunk
(
page 211).
Remove the trunk floor.
The battery for electrical consumers is
located in the right hand area of the
trunk (
page 400).
Use the 10 mm open-end wrench from
the vehicle tool kit to disconnect the
negative lead from negative
terminal5 of the consumer battery
(
page 427).
Warning!G
With a disconnected battery

you will no longer be able to turn the
SmartKey in the starter switch and
pressing the KEYLESS-GO* start/stop
button on the gear selector lever will
have no effect

the gear selector lever will remain
locked in positionP
!Always disconnect the batteries in the order
described below, even if you only want to charge
the starter battery, for example. Otherwise the
vehicle’s electronics can be damaged.