2012 MERCEDES-BENZ SLK250 warning lights

00030005
indicator lamp 0002does not light
up.
The 00040003 indicator lamp has no
function. It lights up briefly when the ignition
is switched on and then goes out again. G
WARNING
If the red 0019SRS warning lamp in the
instrument cluster and the 0015PASSENGER
AIR BAG OFF indicator lamp light up
simultaneously, the OCS is malfunctioning.
The front-passenger front air bag and the
front-passenger knee bag will be deactivated
in this case. Have the system checked as soon
as possible by qualified technicians. Consult
an authorized Mercedes-Benz Center.
Only have the seat repaired at an authorized
Mercedes-Benz Center.
In order to ensure correct operation of the air
bag system and OCS:
R sit with the seat belt fastened correctly and
in a position that is as upright as possible
with your back against the backrest.
R while seated, an occupant should not
position themselves in such away as to
cause their weigh tto be lifted from the seat
cushion as this may result in OCS being
unable to correctly assess the occupant's
weight category.
R read and observe all warnings in this
section.
System self-test The
00030005 indicator lamp illuminates
when you:
R turn the SmartKey to position 1or 2in the
ignition lock
R press the KEYLESS-GO Start/Stop button
once or twice
If an adult occupant is sitting properly on the
front-passenger seat and the OCS classifies
the occupant as an adult, the 00030005
indicator lamp will illuminate and go out again
after approximately six seconds. If the seat is not occupied and the OCS
classifies the front passenger seat as being
unoccupied, the
00030005indicator lamp
will illuminate and not go out. G
WARNING
If the 0015 PASSENGER AIR BAG OFF
indicator lamp does not illuminate, the system
is not functioning. Consult an authorized
Mercedes-Benz Center before seating a child
on the front-passenger seat.
For more information, see "Problems with the
Occupant Classification System"
(Y page 46). G
WARNING
Never place anything between seat cushion
and child seat (e.g. a pillow), since it reduces
the effectiveness of the OCS. The underside
and rear side child restraint system must be
placed entirely on the seat cushion and the
backrest of the front-passenger seat
backrest.
If necessary, adjust the tilt of the passenger
seat backrest.
An incorrectly mounted child seat could cause
injuries to the child in case of an accident,
instead of increasing protection for the child.
Follow the manufacturer's instructions for
installation of child restraint systems. Occupant safety
45Safety Z

of your shoulder and the lap section across
your hips.
X Engage belt tongue 0003in buckle 0023.
X If necessary, pull upwards on the shoulder
section of the seat belt to tighten the belt
across your body.
The seat belt on the front-passenger side is
equipped with a special seat belt retractor to
securely fasten a child restraint system in the
front-passenger seat. For further information
about special seat belt retractors, see
(Y page 55).
For more information about releasing the seat
belt with release button 0022, see "Releasing
seat belts" (Y page 51).
Seat belt adjustment i
AMG vehicles do not include the seat-belt
adjustment function.
The seat-belt adjustmen tfunction adjusts the
driver's and front-passenger seat belt to the
upper body of the occupants.
The belt strap is tightened slightly when:
R you engage the belt tongue in the belt
buckle and you then turn the SmartKey to
position 2in the ignition lock.
R the SmartKey is in position 2in the ignition
loc ka nd you then engage the belt tongue
in the buckle.
The seat-belt adjustment will apply a
retraction force if any slack is detected
between the occupant and the sea tbelt. Do
not hold on to the seat belt tightly while it is
adjusting. You can switch the seat-belt
adjustment on and off in the on-board
computer (Y page 194).
The seat-belt adjustment is an integral part of
the PRE-SAFE ®
convenience function. More
information about PRE-SAFE ®
can be found
in the "PRE-SAFE ®
(preventative occupant
protection)" section (Y page 47). Releasing seat belts X
Press release button 0022(Ypage 50) and
guide belt tongue 0003back towards belt
loop 0002.
! Make sure that the seat belt is fully rolled
up. Otherwise, the seat belt or belt tongue
will be trapped in the door or in the seat
mechanism. This could damage the door,
the door trim panel and the seat belt.
Damaged seat belts can no longer fulfill
their protective function and must be
replaced. Visit a qualified specialist
workshop.
Belt warning for the driver and front
passenger Regardless of whether the driver's and front-
passenger seat belts have already been
fastened, the
001Aseat belt warning lamp will
light up for six seconds each time the engine
is started. It then goes out if the driver and
the fron tpassenger have fastened their seat
belts.
If the driver's seat belt is no tfastened when
the engine is started, an additional warning
tone will sound. The warning tone goes out
after approximately six seconds or once the
driver's seat belt is fastened.
If after six seconds the driver's or front-
passenger seat belt is no tfastened and the
doors are closed, the 001Aseat belt warning
lamp will remain lit:
R until the driver's or fron tpassenger's seat
belt is fastened
R once the vehicle has exceeded a speed of
15 mph (25 km/h), in addition a warning
tone will sound with increasing intensity for
up to 60 seconds or until the driver's or
front-passenger seat belt is fastened.
If the driver or fron tpassenger unfastens their
seat belt during the journey, the 001Aseat
belt warning lamp lights up and the warning
tone sounds again. Occupant safety
51Safety Z

The warning tone ceases after 60 seconds
even if the driver or frontp
assenger has still
no tfastened their seat belt .The 001A seat
belt warning lamp stops flashing, but remains
lit.
After the vehicle has come to a stop, the
warning tone will be reactivated and the
001A seat belt warning lamp will flash again
once the vehicle has exceeded a speed of
15 mph (25 km/h).
The 001A seat belt warning lamp will not go
out until:
R both the driver and the front passenger
have fastened their seat belts.
or
R the vehicle is stationary and a door is open.
i For more information on the 001Aseat
belt warning lamp, see "Warning and
indicator lamps in the instrument cluster,
seat belt" (Y page 228).
Emergency Tensioning Devices, belt
force limiters The seat belts are equipped with ETDs and
seat belt force limiters.
The ETDs tighten the seat belts in an accident,
pulling them close against the body.
The ETDs do not correct incorrect seat
positions or incorrectly fastened seat belts.
The ETDs do not pull vehicle occupants back
towards the backrest.
Seat belt force limiters, when triggered, help
to reduce the peak force exerted by the seat
belt on the vehicle occupant.
The seat belt force limiters are synchronized
with the front air bags, which take on a part
of the deceleration force. Thus, the force
exerted on the occupant is distributed over a
greater area.
The ETDs can only be activated when:
R the ignition is switched on.
R the restraint systems are operational; see
"SRS warning lamp" (Y page 36).R
the belt tongue is engaged in the buckle on
each of the three-point seat belts.
R the front-passenger seat is occupied and
the belt tongue is engaged in the buckle on
the front-passenger side.
The ETDs are triggered depending on the type
and severity of an accident:
R if, in the event of a head-on or rear-end
collision, the vehicle decelerates or
accelerates rapidly in a longitudinal
direction during the initial stages of the
impact
R if, in the event of a side impact, the vehicle
is subjected to high lateral acceleration/
deceleration
R if, in certain situations where the vehicle
overturns, the system determines that it
can provide additional protection
If the air bags are deployed, you will hear a
bang, and a small amount of powder may also
be released. Only in rare cases will the bang
affect your hearing. The powder that is
released generally does not constitute a
health hazard. The 0019SRS warning lamp
lights up. G
WARNING
Pyrotechnic ETDs that were activated must be
replaced.
For your safety, when disposing of the
pyrotechnic ETDs always follow our safety
instructions. These are available at any
authorized Mercedes-Ben zCenter.
! If the front-passenger seat is not
occupied, do not engage the seat belt
tongue in the buckle on the front-
passenger seat. Otherwise, the Emergency
Tensioning Device could be triggered in the
event of an accident. 52
Occupant safetySafety

G
WARNING
If the ABS malfunctions, other driving systems
such as the BAS or the ESP ®
are also switched
off. Observe indicator and warning lamps that
may come on as well as messages in the
multifunction display that may appear.
If the ABS malfunctions, the wheels may lock
during hard braking, reducing the steering
capability and extending the braking distance.
The 0014 warning lamp in the instrument
cluster lights up when the ignitio nis switched
on. It goes out when the engine is running.
Brakes If ABS intervenes when braking, you will feel
a pulsing in the brake pedal.
X If ABS intervenes: continue to depress the
brake pedal vigorously until the braking
situation is over.
X To make a full brake application:
depress the brake pedal with full force.
The pulsating brake pedal can be an
indication of hazardous road conditions, and
functions as a reminder to take extra care
while driving. G
WARNING
Do not pump the brake pedal.U se firm, steady
brake pedal pressure instead. Pumping the
brake pedal defeats the purpose of the ABS
and significantly reduces braking
effectiveness. BAS (Brake AssistS
ystem)
i Observe the "Important safety notes"
section (Y page 56).
BAS operates in emergency braking
situations. If you depress the brake pedal
quickly, BAS automatically boosts the braking
force, thus shortening the stopping distance.
X Keep the brake pedal firmly depressed until
the emergency braking situation is over.
ABS prevents the wheels from locking. The brakes will function as usual once you
release the brake pedal. BAS is deactivated. G
WARNING
If the BAS malfunctions, the brake system still
functions, but without the additional brake
boost available that the BAS would normally
provide in an emergency braking maneuver.
Therefore, the braking distance may increase. BAS PLUS (Brake Assist System Plus)
BAS PLUS is only available in vehicles
equipped with DISTRONIC PLUS.
i Observe the "Important safety notes"
section (Y page 56).
BAS PLUS assists you when braking in a
hazardous situation at speeds of over
20 mph (30 km/h), and uses the radar sensor
system to assess traffic conditions.
i This device has been approved by the FCC
as a "Vehicular Radar System". The radar
sensor is intended for use in an automotive
radar system only. Removing, altering or
tampering with the device will void any
warranties, and is not permitted by the
FCC. Do not tamper with, alter, or use in
any non-approved way.
Any unauthorized modification to this
device could void the user's authority to
operate the equipment.
With the help of the radar sensor system, BAS
PLUS can detect obstacles that are in the
path of yourv ehicle for an extended period of
time.
BAS PLUS can also react to stationary
obstacles, e.g. stopped or parked vehicles, at
speeds of up to approximately 40 mph
(70 km/h).
Should you approach an obstacle and BAS
PLUS has detected a risk of collision, BAS
PLUS calculates the brakin gforce necessary
to avoid a rear-end collision. Should you apply
the brakes forcefully, BAS PLUS can Driving safety systems
57Safety Z

X
To switch off: press button0002.
The 0012 ESP®
OFF warning lamp in the
instrument cluster lights up. G
WARNING
Whe nthe 0012 ESP®
OFF warning lamp is lit,
ESP ®
is deactivated.
If the 000B ESP®
warning lamp and the
0012 ESP®
OFF warning lamp remain lit,
ESP ®
is not available due to amalfunction.
When ESP ®
is deactivated or no toperational,
vehicle stability in standard driving
maneuvers is reduced.
Adapt your speed and driving to the prevailing
road conditions and to the non-operating
status of the ESP ®
.
! Avoid spinning the driven wheels for an
extended period with ESP ®
deactivated.
You could otherwise damage the drivetrain.
X To switch on: press button0002.
The 0012 ESP®
OFF warning lamp in the
instrument cluster goes out.
Deactivating/activating ESP ®
(AMG
vehicles) Activating/deactivating SPORT handling
mode
G
WARNING
The SPORT handling mode should not be
switched on during normal driving.
Switching on the SPORT handling mode will
result in the following:
R no restriction to the engine torque
R system supported traction control is
limited
The SPORT handling mode is designed for
driving on closed tracks when the vehicle's
own natural oversteer and understeer
characteristics are desired and requires a
highly skilled and experienced driver able to
handle these critical driving situations. You could lose control of your vehicle and
cause an accident.
Please be aware of these limits when you
switch on the SPORT handling mode.
Do not switch on the SPORT handling when a
spare wheel is mounted.
ESP ®
is activated automatically when the
engine is started.
i Vehicles with ECO start/stop function:
the ECO start/stop function switches the
engine off automatically when the vehicle
comes to a stop. The engine starts
automatically when the driver wants to pull
away again. ESP ®
remains in its previously
selected status. Example: if ESP ®
was
deactivated before the engin ewas
switched off, ESP ®
remains deactivated
when the engine is switched on again.
It may be best to activate SPORT handling
mode in the following situations:
R when using snow chains
R in deep snow
R on sand or gravel G
WARNING
Switch off the SPORT handling mode and
switch on the ESP ®
immediately if the
aforementioned circumstances do no tapply
anymore. Otherwise the SPORT handling
mode will only stabilize the vehicle to a limited
extent when it is starting to skid or a wheel is
spinning.
When SPORT handling mode is activated:
R ESP ®
only improves driving stability to a
limited degree.
R engine torque is only restricted to a limited
degree, and the drive wheels are able to
spin. The spinning wheels produce a
cutting effect for better traction.
R traction control is still activated.
R ESP ®
still provides support when you brake
firmly. 60
Driving safet
ysystemsSafety

If SPORT handling mode is activated and one
or more wheels start to spin, the 000BESP®
warning lamp in the instrument cluster
flashes. ESP ®
only stabilizes the vehicle to a
limited degree. X
To activate: briefly press button 0002.
The 0002 SPORT handling mode warning
lamp in the instrument cluster lights up.
The SPORT handling mode message
appears in the multifunction display.
X To deactivate: briefly press button 0002.
The 0002 SPORT handling mode warning
lamp in the instrument cluster goes out.
Deactivating/activating ESP ®G
WARNING
The ESP ®
should not be switched off during
normal driving.
Disabling of the system willr esult in the
following:
R no restriction to engine torque
R loss of system-supported traction control
"ESP ®
OFF" is designed for driving on closed
tracks when the vehicle's natural oversteer
and understeer characteristics are desired
and requires a highly skilled and experienced
driver able to handle these critical driving
situations.
You could lose control of your vehicle and
cause an accident.
Please be aware of these limits when you
switch off the ESP ®
. Do not switch off the ESP
®
when a spare
wheel is mounted.
ESP ®
is activated automatically when the
engine is started.
i Vehicles with ECO start/stop function:
the ECO start/stop function switches the
engine off automatically when the vehicle
comes to a stop. The engine starts
automatically when the driver wants to pull
away again. ESP ®
remains in its previously
selected status. Example: if ESP ®
was
deactivated before the engine was
switched off, ESP ®
remains deactivated
when the engine is switched on again.
It may be best to deactivate ESP ®
in the
following situations:
R when using snow chains
R in deep snow
R on sand or gravel G
WARNING
Switch on ESP ®
immediately if one of the
previously stated conditions is no longer met.
Otherwise, ESP ®
cannot stabilize the vehicle
if it begins to lurch or when a wheel spins.
If you deactivate ESP ®
:
R ESP ®
no longer improves driving stability.
R engine torque is no longer limited and the
drive wheels are able to spin. The spinning
wheels produce a cutting effec tfor better
traction.
R traction control is still activated.
R PRE-SAFE ®
is no longer available, nor is it
activated if you brake firmly and ESP ®
intervenes.
R PRE-SAFE ®
Brake is no longer available,
nor is it activated if you brake firmly and
ESP ®
intervenes.
R ESP ®
still provides support when you brake
firmly.
If ESP ®
is deactivated and one or more wheels
start to spin, the 000BESP®
warning lamp in Driving safety systems
61Safety Z

the instrument cluste
rdoes not flash. In such
situations, ESP ®
will not stabilize the vehicle. X
To deactivate: press button0002until the
0012 ESP®
OFF warning lamp lights up in
the instrument cluster.
The 000BOFF message appears in the
multifunction display. G
WARNING
When the 0012ESP®
OFF warning lamp is lit,
ESP ®
is deactivated.
If the 000B ESP®
warning lamp and the
0012 ESP®
OFF warning lamp remain lit,
ESP ®
is not available due to amalfunction.
When ESP ®
is deactivated or no toperational,
vehicle stability in standard driving
maneuvers is reduced.
Adapt your speed and driving to the prevailing
road conditions and to the non-operating
status of the ESP ®
.
! Avoid spinning the driven wheels for an
extended period with ESP ®
deactivated.
You could otherwise damage the drivetrain.
X To activate: briefly press button 0002.
The 0012 ESP®
OFF warning lamp in the
instrument cluster goes out. The 000BONmessage appears in the multifunction
display. EBD (electronic brake force
distribution)
i Observe the "Important safety notes"
section (Y page 56).
EBD monitors and controls the brake
pressure on the rear wheels to improve
driving stability while braking. G
WARNING
If EBDh as malfunctioned, the braking system
remains available with full brake boosting
effect .However, the rear wheels can still lock,
e.g. under full braking. This could cause you
to lose control of your vehicle and cause an
accident .You should therefore adapt your
driving style to the different handling
characteristics.
X Observe the notes on warning and indicator
lamps (Y page 230) as well as display
messages (Y page 202). ADAPTIVE BRAKE
ADAPTIVE BRAKE enhances braking safety
and offers increased braking comfort. In
addition to the braking function, ADAPTIVE
BRAKE also has the HOLD function
(Y page 168) and hill start assist
(Y page 134). For further information, see
Driving tips (Y page 153). PRE-SAFE
®
Brake
PRE-SAFE ®
Brake is only available in vehicles
with DISTRONIC PLUS.
i Observe the "Important safety notes"
section (Y page 56).
PRE-SAFE ®
Brake can help you to minimize
the risk of a frontal collision with a vehicle
ahead or reduce the effect sofsuch a
collision. If PRE-SAFE ®
Brake has detected a
ris kofc ollision, you will be warned visually
and acoustically as well as by automatic 62
Driving safety systemsSafety

X
Push release catch 0002in the direction of
the arrow and at the same time, remove
mechanical key 0003from the SmartKey. SmartKey battery
Important safety notes Have the batteries changed at a qualified
specialist workshop.
G
WARNING
Batteries contain toxic substances.
Swallowing batteries can lead to serious
health issues or death.
Keep batteries out of the reach of children.
Seek medical attention immediately if a
battery is swallowed. G
WARNING
The SmartKey batteries contain perchlorate
material, which may require special handling
and regard for the environment. Observe
government disposal guidelines. California
residents, see www.dtsc.ca.gov/
HazardousWaste/Perchlorate/
index.cfm .
Checking the battery X
Press the 000For0010 button.
The battery is working properly if battery
check lamp 0002lights up briefly
If battery check lamp 0002does not light up
briefly during the test, the battery is
discharged. X
Changing the battery (Y page 71)
i You can obtain the battery at a qualified
specialist workshop.
i If the SmartKey battery is checked within
the signal reception range of the vehicle,
pressing the 000For0010 button locks or
unlocks the vehicle.
Replacing the battery You require a CR 2025 3 V cell battery.
X
Take the mechanical key out of the
SmartKey (Y page 70). X
Press mechanical key 0003into the opening
in the SmartKey in the direction of the
arrow until battery tray cover 0002opens.
When doing so, do not hold cover 0002shut.
X Remove battery tray cover 0002. X
Repeatedly tap the SmartKey against your
palm until battery 0023falls out.
X Inser tthe new battery with the positive
terminal facing upwards. Use a lint-free
cloth to do so. SmartKey
71Opening/closing Z