2012 MERCEDES-BENZ SLK250 stop start

ECO start/stop function
Important safety notes G
WARNING
If the ECO symbol appear sinthe
multifunction display when the engine is
switched off, the engine was switched off
automatically .However, all vehicle systems
remain active. If you open the door, unfasten
your seat belt or remove your foot from the
brake pedal, the engine will automatically
start.T he vehicle may begin moving. There is
a risk of an accident.
To prevent the vehicle from pulling away
unintentionally, only remove your foot from
the brake pedal if you want to drive on.
Do not leave the vehicle until you have
switched off the ignition and secured the
vehicle to prevent it from rolling away.
! Always switch the ignition off and take the
key with you when leaving the vehicle.
General notes The ECO start/stop function is only available
for the SLK 55 AMG.
The ECO start/stop function is only available
in drive program C.
The ECO start/stop function switches the
engine off automatically when the vehicle
stops moving.
The engine starts automatically when the
driver wants to pull away again. The ECO
start/stop function thereby helps you to
reduce the fuel consumption and emissions
of your vehicle.
The system is operational if all conditions for
automatic engine switch-off have been
fulfilled (Y page 135) and the 000Esymbol is
shown in the multifunction display. In
addition, the Stop/Start active message
is shown in the AMG menu in the
multifunction display.
If not all conditions for automatic engine
switch-off are fulfilled, the border of the ECO symbol disappears in the multifunction
display. In addition, the
Stop/Start inactive message is shown in the AMG
menu in the multifunction display.
If the ECO start/stop function is deactivated
(Y page 136), the 000Esymbol and the
Stop/Start active or
Stop/Start inactive message are not shown.
i If automatic cylinder shut-off is active in
drive program C, the number of active
cylinders 4is also shown in the 000E
symbol. This means that the engine is
operating with four cylinders.
If cylinder shut-off is not active, the engine
will operate with all eight cylinders. In this
case, the number of active cylinders 8is
shown in the 000Esymbol.
Automatic engine switch-off The ECO start/stop function switches the
engine off automatically if the vehicle is
braked to a standstill and the brake remains
depressed with the transmission in position
D
or N.
The engine is only switched off if:
R the vehicle is at a standstill.
R the outside temperature is within the range
which is suitable for the system.
R the engine is at normal operating
temperature.
R the battery is sufficiently charged.
R the system detects that the windshield is
not fogged up when the air-conditioning
system is switched on.
R the hood is closed.
R no engine-relevant diagnostics are active.
R the front door is closed and the seat belt is
fastened.
i You can still activate the HOLD function
when the vehicle is stationary, even if the
engine has been switched off
automatically. It is then not necessary to
continue applying the brakes during the
automatic stop phase. When you depress Driving
135Driving and parking Z

the accelerator pedal, the engine starts
automatically and the braking effect of the
HOL
Dfunction is deactivated. Depress the
accelerato rpedal carefully, as the engine
must be started first.
i If you shift the transmission from Rto D,
the ECO start/stop function is available
again once the 000Esymbol reappears in
the multifunction display.
i Automatic engine switch-off can take
place a maximum of three times
consecutively. The automatic engine
switch-off is then available again after the
border of the ECO symbol appears in the
multifunction display.
Automatic engine start The engine starts automatically if:
R
you deactivate the ECO start/stop function
by pressing the ECO button.
R you switch to drive program Sor M.
R you depress the accelerator pedal.
R the vehicle starts to roll.
R the brake system requires this.
R the system detects moisture on the
windshield when the air-conditioning
system is switched on.
R the charge level of the battery is too low.
R the driver's seat belt is removed or the
driver's door is opened.
R you shift the transmission from position D
to R.
R you engage reverse gear R.
R you release the brakes when in
transmission position Dor Nand when the
HOLD function is not active.
R you steer the vehicle.
i Shifting the transmission to position P
does not start the engine. Deactivating/activating the ECO start/
stop function
Example: ECO button
i
If indicator lamp 0003is off, the ECO start/
stop function has been deactivated
manually or as the result of a malfunction.
The engine will then not be switched off
automatically when the vehicle stops.
i Each time the engine is started, the ECO
start/stop function switches to the status
(on or off) that was selected before
switching off the engine.
Deactivating
X Press button 0002in drive program C.
or
X Switch to drive program Sor M
(Y page 142).
Indicator lamp 0003on button 0002and the
000E symbol in the multifunction display go
out.
The Stop/Start active or
Stop/Start inactive message in the AMG menu in the
multifunction display goes out.
Activating
X Press button 0002.
Indicator lamp 0003lights up. If drive
program Sor Mis active, the automatic
transmission switches to drive program C.
If all conditions for automatic engine
switch-off (Y page 135) are fulfilled, the
000E symbol is shown in the multifunction
display. In addition, the Stop/Start136
DrivingDriving and parking

active message is shown in the AMG
menu in the multifunction display.
If not all conditions for automatic engine
switch-off (Y page 135) are fulfilled, the
Stop/Start inactive message will be
shown in the AMG menu of the
multifunction display and the frame around
the ECO symbol fades out. If this is the
case, the ECO start/stop function is not
available. Driving
137Driving and parking Z

Problems with the engine
Problem Possible causes/consequences and
0001 Solutions
The engine does not
start. The starter motor
can be heard. R
There is a malfunction in the engine electronics.
R There is a malfunction in the fuel supply.
X Before attempting to start the engine again, turn the SmartKey
in the ignition back to position 0or press the Start/Stop button
repeatedly until all indicator lamps in the instrumen tcluster go
out.
X Try to start the engine again (Y page 132). Avoid excessively
long and frequent attempts to start the engine as these will drain
the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. The engine does not
start. You cannot hear
the starter motor. The on-board voltage is too low because the battery is too weak
or discharged.
X
Jump-star tthe vehicle (Y page 285).
If the engine does not start despite attempts to jump-start it:
X Consult a qualified specialist workshop. The starter motor was exposed to a thermal load that was too high.
X
Allow the starter motor to cool down for approximately two
minutes.
X Try to start the engine again.
If the engine still does not start:
X Consult a qualified specialist workshop. The engine is not
running smoothly and
is misfiring. There is a malfunction in the engine electronics or in a mechanical
component of the engine management system.
X
Only depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic
converter and damage it.
X Have the cause rectified immediately at a qualified specialist
workshop. The coolant
temperature gauge
shows a value above
248 ‡ (120 †). The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
X
Stop as soon as possible and allow the engine and the coolant
to cool down.
X Check the coolant level (Y page 262). Observe the warning
notes as you do so and add coolant if necessary. 138
DrivingDriving and parking

Problems with the transmission
Problem Possible causes/consequences and
0001 Solutions
The transmission has
problems shifting gear. The transmission is losing oil.
X
Have the transmission checked at a qualified specialist
workshop immediately. The acceleration ability
is deteriorating.
The transmission no
longer changes gear. The transmission is in emergency mode.
It is only possible to shift into
secondgear and reverse gear.
X Stop the vehicle.
X Shift the transmission to position P.
X Switch off the engine.
X Wait at least 10seconds before restarting the engine.
X Shift the transmission to position Dor R.
If D is selected, the transmission shifts into secondgear; ifRis
selected, the transmission shifts into reverse gear.
X Have the transmission checked at a qualified specialist
workshop immediately. Releasing the parking lock manually
In the event of an electrical malfunction, it is
possible to release the selector lever lock
manually to move it out of position P, e.g. if
you wish to tow the vehicle away. !
Do not use any sharp-edged objects to
remove the selector lever gaiter from the
center console. This could damage the
selector lever gaiter. X
Apply the electric parking brake.
X Press the frame of selector level gaiter 0002
together somewhat on the side edge at the
back and hold with one hand 0003.
X With the other hand, pry off the frame of
selector level gaiter 0002with a flat, blunt
object (e.g. a screwdriver wrapped in cloth)
at rear edge 0023, pulling it up and out at the
same time.
X Press release buttons 0022down and
simultaneously move the selector lever out
of position P.
The selector lever can now be moved freely
until it is returned to position P. Refueling
Important safety notes
G
WARNING
Gasoline is highly flammable and poisonous.
It burns violently and can cause serious
personal injury. 146
RefuelingDriving and parking

Switching off the engine
Important safety notes G
WARNING
Do not turn off the engine before the vehicle
has come to a complete stop. 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 vehicle.
Vehicles with manual transmission X
Shift to either first gear or reverse gear R.
X Turn the SmartKey to position 0in the
ignition lock and remove it.
The immobilizer is activated.
X Apply the electric parking brake.
Vehicles with automatic transmission X
Apply the electric parking brake.
X Shift the transmission to position P.
Using the SmartKey
X Turn the SmartKey to position 0in the
ignition lock and remove it.
The immobilizer is activated.
i The SmartKey can only be removed if the
transmission is in position P.
Using KEYLESS-GO
X Press the Start/Stop button (Y page 131).
The engine stops and all the indicator
lamps in the instrumen tcluster go out.
i When the driver's door is closed, this
corresponds to SmartKey position 1.When
the driver's door is open, it corresponds to
SmartKey position 0or "SmartKey
removed".
If you attempt to switch off the engine while
the selector lever is in a position other than
P, a message appears in the multifunction
display and you hear a tone. Electric parking brake
General information i
The electric parking brake performs a
function test at regular intervals while the
engine is switched off. The sounds that can
be heard while this is occurring are normal. G
WARNING
When leaving the vehicle, always remove the
SmartKey from the starter switch, take it with
you, and lock the vehicle. Do not leave
children unattended in the vehicle, or with
access to an unlocked vehicle. Children could
release the parking brake and/or shift the
automatic transmission out of park position
P, either of which could result in an accident
and/or serious personal injury. Applying/releasing manually
X
To apply: press handle 0002.
The red 0005(USA only) or 000A(Canada
only) indicator lamp in the instrument
cluster lights up.
i The electric parking brake can also be
applied when the SmartKey is removed.
X To release: switch on the ignition.
X Pull handle 0002.
The red 0005(USA only) or 000A(Canada
only) indicator lamp in the instrument
cluster goes out.
i The electric parking brake cannot be
released unless the SmartKey is in position
1 in the ignition lock or if the ignition has 150
ParkingDriving and parking

been switched on using the Start/Stop
button.
Applying automatically Your vehicle's electric parking brake is
applied automatically if DISTRONIC PLUS
(vehicles with automatic transmission only)
or the HOLD function stops your vehicle or is
keeping your vehicle stationary. In addition,
at least one of the following conditions must
be fulfilled:
R the engine is switched off.
R the driver's door is open and the seat belt
is not fastened.
R the vehicle is stationary for a lengthy
period.
The red 0005(USA only) or 000A(Canada
only) indicator lamp in the instrument cluster
lights up.
Releasing automatically i
The electric parking brake can only be
released automatically on vehicles with
automatic transmission.
Your vehicle's electric parking brake is
automatically released if all of the following
conditions are met:
R the engine is running.
R the transmission is in position Dor R.
R the seat belt has been fastened.
R you depress the accelerator pedal.
If the transmission is in position R, the trunk
lid must be closed.
If your seat belt is not fastened, the following
conditions must be fulfilled to automatically
release the electric parkin gbrake:
R the driver's door is closed.
R you have shifted out of position Por you
have previously drive nfaster than 2mph
(3km/h). Emergency braking The vehicle can also be braked during an
emergency by using the electric parking
brake.
X
While driving, push handle 0002of the electric
parking brake (Y page 150).
i The vehicle is braked as long as you keep
the handle of the electric parking brake
pressed. The longer the electric parking
brake handle is depressed, the greater the
braking force.
During braking:
R a warning tone sounds.
R the Please Release Parking Brake message appears.
R the red 0005(USA only) or 000A(Canada
only) indicator lamp in the instrument
cluster flashes.
When the vehicle has been braked to a
standstill, the electric parking brake is
engaged. Parking the vehicle for
along period
If you leave the vehicle parked for longer than
four weeks, the battery may be damaged by
exhaustive discharge.
X Connect a trickle charger.
i You can obtain information about trickle
chargers from a qualified specialist
workshop.
If you leave the vehicle parked for longer than
six weeks, the vehicle may suffer damage as
a result of lack of use.
X Visit a qualified specialist workshop and
seek advice. Parking
151Driving and parking Z

The DISTRONIC PLUS braking effect is
canceled and the vehicle can start moving if:
R DISTRONIC PLUS is deactivated using the
cruise control lever.
R you accelerate.
R there is a malfunction in the system or an
interruption in the power supply, e.g.
battery failure.
R the electrical system in the engine
compartment, the battery or the fuses are
tampered with.
R the battery is disconnected.
If you wish to leave the vehicle or park it,
deactivate DISTRONIC PLUS and secure the
vehicle against rolling away.
If DISTRONIC PLUS detects that the vehicle
in fronti s stopping, it brakes your vehicle until
it is stationary.
Once your vehicle is stationary, it remains
stationary and you do not need to depress the
brake.
i After a time, the electric parking brake
secures the vehicle and relieves the service
brake.
i Depending on the specified minimum
distance, your vehicle will come to a
standstill at a sufficient distance behind the
vehicle in front.T he specified minimum
distance is set using the control on the
cruise control lever.
The electric parking brake automatically
secures the vehicle if DISTRONIC PLUS is
activated and:
R the driver's door is open and the driver's
seat belt is unfastened.
R the hood is opened.
R a system malfunction occurs.
R the power supply is not sufficient.
If there is a malfunction in the vehicle
electronics, a warning message may also
appearint he multifunction display.
Brake Immediately X
Immediately depress the brake pedal firmly
until the warning message in the
multifunction display goes out. DISTRONIC
PLUS is deactivated.
Shift to 'P' X
Shift the transmission to position Pto
prevent the vehicle from rolling away.
DISTRONIC PLUS is deactivated. The
warning message in the multifunction
display disappears.
The horn will also sound at regular intervals if
DISTRONIC PLUS is activated and you:
R switch the engine off, open the driver's
door and remove your seat belt
R open the hood
The sounding of the horn alerts you to the fact
that the vehicle has been parked while
DISTRONIC PLUS is still activated. The sound
becomes louder if you attempt to lock the
vehicle. The vehicle is not locked until
DISTRONIC PLUS is deactivated.
i If the engine has been switched off, it
cannot be started again until DISTRONIC
PLUS has been deactivated.
Setting aspeed G
WARNING
Keep in mind tha titmay take a brie fmoment
until the vehicle has made the necessary
adjustments.
Increase or decrease the set vehicle speed to
a value that the prevailing road conditions and
legal speed limits permit. Otherwise, sudden
and unexpected acceleration or deceleration
of the vehicle could cause an accident and/
or serious injury to you and others.
X Press the cruise control lever up 0002for a
higher speed or down 0003for a lower speed.
X To adjust the speed in 1 mph
increments (1 km/h increments): briefly Driving systems
163Driving and parking Z