Page 400 of 481
399 Practical hints
Replacing SmartKey batteries
SmartKey
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove mechanical key1
(page 394).
1Mechanical key
2Slide
3Battery compartment
Insert mechanical key1 in direction
of arrow in side opening.
Using mechanical key1, push gray
slide2 to unlatch battery
compartment3.
Pull battery compartment3 out of the
housing in direction of arrow.
Remove the discharged batteries in di-
rection of arrow.
4Battery
5Contact spring
Using a lint-free cloth, insert new
batteries4 under contact spring5
with the positive terminal (+) facing up.
Return battery compartment2 into
the housing until it locks into place.
Slide mechanical key1 back into the
SmartKey.
Check the operation of the SmartKey.
Page 407 of 481
406 Practical hintsReplacing wiper bladesRemoving wiper blades
Turn the SmartKey in the starter switch
to position1.
Turn combination switch to wiper
settingII (
page 56).
With wiper arms in vertical position,
turn the SmartKey in the starter switch
to position0.
Fold the wiper arms forward until they
engage.
1Wiper blade
2Tabs
3Attachment
4Cover
Press tabs2 together and tilt wiper
blade1 in direction of arrow.
Tabs2 on both recesses of
attachment3 are detached.
Maintaining its tilted position, remove
wiper blade1 out of attachment3.
Warning!
G
For safety reasons, switch off wipers and
remove the SmartKey from the starter
switch before replacing a wiper blade. Oth-
erwise, the motor could suddenly turn on
and cause injury.!To avoid damage to the hood, the wiper
arms should only be folded forward
when in the vertical position.
Page 409 of 481
408 Practical hintsFlat tireThe SLK 55 AMG with Performance
Package* is equipped with a TIREFIT kit.Preparing the vehicle
Park the vehicle as far as possible from
moving traffic on a hard surface.
Turn on the hazard warning flashers.
Turn the steering wheel so that the
front wheels are in a straight ahead po-
sition.
Set the parking brake (
page 52).
Move the gear selector lever* toP
(manual transmission to first or reverse
gear).
Turn off the engine (
page 61).
Remove the SmartKey from the starter
switch.
Have any passenger exit the vehicle at
a safe distance from the roadway.
Sealing tires with TIREFIT
Small tire punctures, particularly those in
the tread, can be sealed with TIREFIT.
TIREFIT can be used in ambient tempera-
tures down to -4°F (-20°C).
iOpen door only when conditions are
safe to do so.
iSLK 55 AMG with Performance
Package* only.Warning!
G
Keep TIREFIT away from sparks, open flame
or heat source.
Do not smoke.
Page 411 of 481
410 Practical hintsFlat tire
Screw the air pump’s air hose5 onto
flange6 of the TIREFIT container.
Stick TIREFIT container1 upside
down into notch3 of the electric air
pump.
7Tire valve
8Electric air pump switch
9Pressure gauge and vent screw
aFiller hose
Unscrew the valve cap from tire
valve7.
Screw filler hosea onto tire valve7.
Close vent screw9 on air hose4.
Insert electrical plug4 into the power
outlet in the passenger footwell
(page 271).
Turn the SmartKey in the starter switch
to position1 (
page 36).
Press I on electric air pump switch8.
The electric air pump should now
switch on and inflate the tire.After 5 minutes, the pressure gauge must
display at least 26 psi (1.8 bar). The air
hose can become hot during inflation.
Please exercise appropriate caution.
If this tire inflation pressure is not at-
tained, turn off the electric air pump,
detach the filler hose from the tire
valve, and drive vehicle back and forth
very slowly approximately 30 ft (10 m).
This serves to better distribute the
TIREFIT sealant material inside the tire.
Unscrew the air pump’s air hose5
from flange6 of the TIREFIT contain-
er.
Screw air hose5onto tire valve7.
Inflate the tire again.
Warning!
G
Observe safety instructions on air pump la-
bel.
!The cigarette lighter (
page 270) is
not designed for use with the electric
air pump. Use the power outlet in the
passenger footwell (
page 271) for
electric air pump operation.
!Do not operate the electric air pump
longer than 6 minutes without interrup-
tion. Otherwise it may overheat.
You may operate the air pump again af-
ter it has cooled off.
Page 412 of 481
411 Practical hints
Flat tire
After attaining a tire inflation pressure
of 26 psi (1.8 bar), press 0 on electric
air pump switch8.
The electric air pump should now be
switched off.
Turn the SmartKey in the ignition to
position0 (
page 36).
Detach the electric air pump.
The air hose may still be hot. Please ex-
ercise appropriate caution.
Store the electrical plug and the air
hose behind the flap and place the
electrical air pump back in the trunk.
Close the trunk lid.
Drive off immediately.
The TIREFIT sealant will distribute itself
evenly inside the tire.
After driving the vehicle for an initial
10 minutes, check the tire inflation
pressure using pressure gauge 9 on
the air pump.
Warning!
G
If a tire inflation pressure of 26 psi (1.8 bar)
is not attained, tire is too severely damaged
for TIREFIT to provide a reliable tire repair.
In this case, TIREFIT cannot properly seal
the tire.
Do not drive the vehicle.
Contact the nearest Mercedes-Benz Center
or call Roadside Assistance.
Warning!
G
Do not exceed vehicle speed of
50 mph (80 km / h). A TIREFIT repair is not
designed to operate at higher speeds.
The sticker must be attached on the instru-
ment cluster where it will be easily seen by
the driver.
Vehicle handling characteristics may
change. Adapt your driving accordingly.
Warning!
G
If tire inflation pressure has fallen below
20 psi (1.3 bar) do not continue to drive the
vehicle.
Park your vehicle safely away from the road-
way and contact the nearest authorized
Mercedes-Benz Center or Roadside
Assistance.
If tire inflation pressure is at least
20 psi (1.3 bar), inflate tire to correct pres-
sure (see placard on the driver’s door
B-pillar), and drive vehicle to nearest tire re-
pair facility to have tire repaired or replaced.
Recommended duration of use:
300 miles (500 km) at 50 mph (80 km/h)
with the recommended tire inflation pres-
sure.
Page 419 of 481
418 Practical hintsFlat tire
Take the electric air pump out of the
trunk (
page 388).
Open flap1 on air pump.
Pull out electrical plug3 and air hose
with pressure gauge4.
Close vent screw on air hose4.
Remove the valve cap from the tire
valve.
Screw air hose4 with union nut5
onto the collapsible tire valve.
Make sure electric air pump switch2
is set to0.
Insert electrical plug3 into the power
outlet in the passenger footwell
(page 271).
Turn the SmartKey in the starter switch
to position1.
PressI on electric air pump switch2.
The electric air pump switches on and
inflates the collapsible tire.
Inflate the collapsible tire to approxi-
mately 51 psi (3.5 bar).
This takes about 5 minutes for the col-
lapsible tire. Air hose4 and union
nut5 can become hot during infla-
tion. Exercise proper caution to avoid
burning yourself when using the equip-
ment.
Press0 on electric air pump switch2.
Turn the SmartKey in the starter switch
to position0.
The electric air pump should now be
switched off.
If the tire inflation pressure is above
51 psi (3.5 bar), release excess tire in-
flation pressure using the vent screw
on air hose4.
!The cigarette lighter (
page 270) is
not designed for use with the electric
air pump. Use the power outlet in the
passenger footwell (
page 271) for
electric air pump operation.
!Do not operate the electric air pump
longer than 6 minutes without interrup-
tion. Otherwise it may overheat.
You may operate the electric air pump
again after it has cooled off.
Page 422 of 481
421 Practical hints
Battery
Battery
The battery is located in the engine com-
partment on the right-hand side below the
windshield washer fluid reservoir.
1Battery
2Positive terminal
3Negative terminal
Warning!
G
Failure to follow these instructions can re-
sult in severe injury or death.
Observe all safety instructions and precau-
tions when handling automotive batteries,
see “Battery” (
page 314).
Never lean over batteries while connecting
them, as you could otherwise be injured.
Battery fluid contains sulfuric acid. Do not
allow this fluid to come into contact with
eyes, skin or clothing. In case it does, imme-
diately 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.
Warning!
G
Do not place metal objects on the battery as
this could result in a short circuit.
Use leak-proof batteries only to avoid the
risk of acid burns in the event of an acci-
dent.!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 Maintenance Booklet for main-
tenance intervals or contact an autho-
rized Mercedes-Benz Center for further
information.
Page 423 of 481
422 Practical hintsBatteryDisconnecting the battery
1Water tray
2Lock
Pull up parking brake lever firmly and
m o v e g e a r s e l e c t o r l e v e r * t o p o s i t i o nP
(manual transmission to Neutral).
Switch off all electrical consumers.
Remove SmartKey from starter switch.
Open the hood (
page 307).
Turn locks2 one quarter turn.
Remove water tray1.
Read and observe safety instructions
and precautions (
page 421).
Use a 10 mm open-end wrench to dis-
connect the negative lead from battery
negative terminal3 (
page 421).
Remove the cover from the positive
terminal.
Use a 10 mm open-end wrench to dis-
connect the positive lead from battery
positive terminal2 (
page 421).
Removing the battery
Remove the screw on the swivel bar.
Remove the swivel bar.
Pull out the battery ventilation tube
from the battery (depending on battery
arrangement in your vehicle model, the
ventilation tube is located either on the
left or right side of the battery).
Take out the battery.
Warning!
G
With a disconnected battery
you will no longer be able to turn the
SmartKey in the starter switch
automatic transmission*: the gear se-
lector lever will remain locked in
positionP
