2004 MERCEDES-BENZ CLK COUPE ignition

50 Safety
Occupant safety
Triggering ofbelt tensioners, belt force limiters and
airbags
In the event ofa collision, the sensor in the
airbag contro lunit evaluates important
physical data, such as duration, direction
and rate of veh icle deceleration or acceler-
ation. Based on this evaluation and pre-
emptively, the belt tensioners are the first
to be triggered by the airb agcontrol unit in
a collis ion with longi tudinal deceleration as
a function of the rate of vehicle decelera-
tion.
The front airbags are not triggered unless a
second activation threshold is reached, i.e.
an even higher rate of vehicle deceleration
in the longitudinal direction is exceeded. i
Thefront airbag on the front-passenger side
is only tri ggered if:
! the front-passenger seat oc cupancy sensor
has detected that the seat is occupied
! the PASSENGER AIRBAG OFF warning lamp
onthe centre console is not lit (
=page 64)
The belt tensioners are only activated if the seat
belt buck le tongue is correctl yengaged in the
se at belt buckle.
Criteria for the activation of belt
tensioners and airbags
To determine whether it is necessary to
activ ate a belt tensioner or airbag, the air-
bag control unit evaluates the duration and
direction of vehicle deceleration or accel-
eration during the initial phase of the colli-
sion.
The activation thresholds for the belt ten-
sioners and the airbags are variable and
are adapted in accordance with the rate of
ve hicle deceleration. This process ispre-
emptive in nature as airbag deployment
must take place during the impact and not
at the end of the collision. G
Risk of inju ry A malfu
nction has occurred if the 1
warning lamp:
! doesnot com eon when yousw itchon
th eignition
! does not go out after a few seconds
when the engine is running
! comes on again
Individ ual systems could beactivated inad-
verte ntly or may not be triggered at all in the
event of an accident with a high rate of vehi-
cle deceleration. Ifthis happens, have the
SRS system checked and repaired immedi-
ately at a qualified specialist wor kshop
wh ich has the necessary specialist know-
ledg eand tools to carry out the work
require d.
Mercedes-Benz recomme nds that youuse a
Mercedes-Benz Service Centre for this pur-
pose. In particular, work relevant to safety
or on safety-re lated systems must be car-
ried out at a qualified specialist workshop. 209en_d2.boo Seite
50Diens tag, 25 .Mai 2004 7:26 19

52 Safety
Occupant safetyi
Belt tensioners do not correct:
! inco rrect sitting positions
! incorrectly worn seat belts
Belt tensioners do not pull occ upants back
towar dsthe backrests.
The belt force limiter reduces the belt
force on the occupant when a belt ten-
sioner is activated.
The belt force limiter is fine-tuned to the
front airbag, which takes over from the
seat belt a part of its restraining forces,
thus spreading the forces exerted on the
occupant over a greater area.
The automatic comfort-fit feature on the
front seats reduces the retraction force of
the seat belts.
When the igniti onisswit ched on, the belt
tensioner will be triggered:
! only if the res traint systems are opera-
tional (the 1warning lamp lights up
after the ignition is switched on and
goes out when the engine is running)
( = page 12) !
forea ch lap- shou lder sea tbe lt, pro-
vided the belt tongue is engaged inthe
seat belt buckle
! if a head-on or rear-end col lision occurs
and the veh icle decelerates or acceler-
ates rapidly ina longitudinal direction
during the initial stages ofthe collision
! on the front-passenger side only ifthe
front-passenger seat is occupied and
the belt tongue is engaged in the seat
belt buckle
! in the event of a severe fronta limpact
if the vehicle decelerates rapidly in a
longitudinal direction during the ini tial
stages of the collision
If the be lttensioners are tri ggered, you will
hear a bang that is genera lly harmless to
your hearing. A small amount of dust may
also be released. The 1warning lamp
lights up.
An indication that a belt tensioner in there ar has
been trigger edisthat the seat belt buckle is
pu lled down and is almost flush with the topof
the seat. G
Risk ofinjury The
belt tensioners in the rear only function
correctly ifthe buckl escan be pulled down
unimpeded.
Since this downwards movementmust not
be restricted:
! Do not grasp the buckles.
! Do not pl ace any obj ects un derneath
the buckles.
Ot he rwi se, the action of the belt tensioners
will beimpaired or completely ineffective.
You will then have no additional prot ection. 209en_d2.boo Seite
52Diens tag, 25 .Mai 2004 7:26 19

68 Safety
Driving safety
systems
In this section, you will find information
about the following driving safety system s:
! ABS(A nti-lock B raking S ystem)
! BAS (B rake As sist)
! ESP (E lectronic S tability P rogram)
i In wintry conditions, use winter tyres (M+S
tyres), with snow chains if ne cessary. The maxi-
mu m effect of ABS, BAS, ESP and SBC can only
be ac hievedin this way. ABS regulates the brake
pressure insuch a
way that the wheels do not lock when you
brake. This allows you to continue steer-
ing.
ABS works from a speed of approxi mately
8 km /hupwards, regardless of road sur-
face conditions.
ABS works on slip pery road surfaces, even
when you only brake gent ly.
The - indicator lamp in the instrument
cluster ( =page 12 )light s up when you
turn the keyto position 2in the ignition
lock. It goes out when the engine isrun-
ning. This indicates that ABS is opera-
tional. Dr
iving safety systems G
Risk of accident The risk of an acci
dent increases especially if
you:
! drive too fast, particularly when cornering
and ona wet or slippery road surfa ce
! drive too close to th evehicle in front
The driving safety systems described in this
section are unable to reduce this risk or over-
ride the laws of physics.
For this reason, always adapt your driving
style to suit the current road and weather con-
ditions and maintain asuffici en tdistanc efrom
other road users and objectsonthe road. ABS
G
Risk of accident Do not depress the brake pedal several times
in
qu ick succession (pumping). Depress the
brake firmly and evenly .Pumping the brake
ped alreduces the braking effect. 209en_d2.boo Seite
68Diens tag, 25 .Mai 2004 7:26 19

69
Safety
Driving safety systems Braking
If ABS cuts in while you are braking, you
will feel:
!
the vehicle vibrating
! the brake pedal pulsating
This will indicate to you that ABS has been
acti vated. Always adapt your driving style
to suit the prevai ling road and weather
conditions.
6 Continue to depress the brake pedal,
even when ABS has been activ ated. Brake Assist operates
inemergency brak-
ing situation s.If you depress the brake
pedal quickly, BAS boosts the braking
force automatically and thus shortens the
stopping distance.
6 Depress the brake pedal firm lyuntil the
emergency-braking situation is ove r.
ABS prevents the wheels from locking.
When you release the brake pedal, the
brakes work as norm al again. BAS is then
deactivated. The Electronic Stabilit
y Program monitors
the traction, i.e. the power transmission
between the tyres and the road, and the
stability of the vehicle.
ESP detects when a wheel is spinning or
when the vehicle has begun to skid. ESP
stabilises the vehicle by applying specific
braking to individual wheels and limiting
the engine power output. ESP assists you
in particular when pulling away on a wet or
slip pery road surface.
If ESP cuts in, the vwarning lamp
flashes in the speedometer.
The v ESP warning lamp in the instru-
ment cluster lights up when you turn the
key to po sition 2in the ignition lock. It
goes out when the engine is running. This
ind icates that ESP is operational. G
Risk of accident Always adapt your driving style to suit the
prevailin
groad and weather conditions and
maintain a suffi cient distance from other
road users and objects onthe road. BAS
G
Risk of accident If BAS malfunctions, the brake system is still
available with the full brake boosting effect.
In an emer
gency braking situation, however,
th e braking fo rce is not automatically
bo osted and may lengthen the stopping dis-
tance. ESP209en_d2.boo Seite
69Diens tag, 25 .Mai 2004 7:26 19

72 Safety
An
ti-theft systems
The immobiliser prevents your vehicle
from bein gstarted without the proper ke y.Activating
!
With the key: the immobiliser is acti-
vated when you remove the key from
the ignition lock.
! With KEYLESS GO*: if you switch off
the engine using the KEYLESS GO but-
ton on the selector lev erand lock the
doors from the outside. Deactiv
ating
! With the key: the immobiliser is deacti-
vated when you switch onthe ignition.
! With KEYLESS GO*: the immobilise ris
deactivated when you switch on the
engine using the button on the se lector
lever. A visua
land audible alarm is triggered if
the alarm system is pr imed and one of the
following is opened:
! a door
! the boot lid
! the bonnet
The alarm is also trigger edif:
! a door is opened using the emergency
key element
i The alarm remains on even if an opened
door is closed again. Priming the
anti-theft ala rmsystem
The indicator lamp is located in the button
for tow-away protection*.
1 Indicator lamp
6 Lock your vehicle .
The alarm system is primed after
approximately 15 seconds. Indicator
lamp 1flashes.
De activating the anti- theft alarm syst
em
When you unlock your vehicle, the anti-
theft alarm system is deactivated.
The anti-theft alarm system will be tri g-
gered if you unlock your vehicle using the
emergency key element and then open it. Anti-thef
tsystems Immobilis
er Anti-thef
talarm system (ADA)* P54.25-3806-31209en_d2.boo Seite
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73
Safety
Anti-theft systems Disabling the alarm
With the key
!
Insert the key into the ignition lock.
or ! Press the Œor‹ button.
The alarm switche soff.
With KEYLESS GO* ! Pull the exterior door handle.
or ! Press the KEYLESS GO button.
The alarm switche soff.
An audible alarm is triggered if the vehi-
cle's tilt angle is altered while tow-away
protection is operational. i The tow-away protection alarm is tri ggered
if th evehicle is jacked up on one side, for exam-
ple. Pr
iming tow-away protection
6 Lock your vehicle.
Tow-away protection is primed after
approximately 30 seconds. De
activating tow-away protect ion
De activate tow-away protection if your
vehicle:
! isto be tr ansported
! isbe ing car ried on another vehicle (e.g.
ferry, car transport er)
This will prevent false alarms.
The button is located on the centre con-
sole.
1 To deactivate tow-aw ayprotection
2 Indicator la mp 6
Turn the key to position 0or 1in the
ignition lock.
i You can only deactivate tow-away prote c-
tion if the ignition is switched off.
6 Press button 1.
Indicator lamp 2comes on briefly.
6 Lock your vehicle using the remote
control.
i Tow-away prot ection is deactivat edauto-
matically when you unlock your vehicle.
Tow-away protecti onremains deactivated until
you lock your vehicle again. Tow-away pro
tection* P54.25-3807-31209en
_d2.boo Seite 73Diens tag, 25 .Mai 2004 7:26 19

74 Safety
An
ti-theft systems
An audible and visual alarmis triggered if
the vehicle is locked and movement is
detected inside the vehicle, e.g. if:
! somebody smashes one of the side
windows
! someone reaches inside the vehicle
! there is someone inthe vehicle
The button is located on the centre con-
sole.
1 Todeactivate the interior motion
sensor
2 Indicator lamp Priming the interior motion sensor
6
Close the side windows and sl iding /
tilting sunroof*.
The interior motion sensor cannot be
prime dif the sliding /tilting sunroof* is
open.
6 Lock your vehicle.
The interior motion sensor is primed
after approximately 30 seconds.
i Do not leave any items (e.g. mascots or coat
hangers) hanging from the rear-view mirror or on
the grab handles on the roof lining. They could
ot he rwise trigger a false alarm. De
activating the interior motion sensor
Deactivate the interior motion sensor if
people or ani mals are to remain in the
locked vehicle. This will prevent false
alarms.
6 Turn the key to position 0or 1in the
ignition lock, or remove it.
6 Press button 1.
The indicator lamp in button 2flashes
briefly.
i The interior motion sensor remains deacti-
vated unti lyou lo ckyour vehicle again. Interior motion sensor* (Coup
é)P 54.25-3808-31 neu209en_d2.boo Seite
74Diens tag, 25 .Mai 2004 7:26 19

75
Safety
Anti-theft systems
An audible and visual alarm is triggered if
the veh icle is locked and:
! someone smashes a side window and
reaches inside the vehicle
! someone reaches inside the vehicle
The button islocated on the centre con-
sole.
1 To deactivate the interior motion sen-
sor
2 Indicator lamp
1F unction is only ava ilablein some countries. i
Donot leave any item s(e.g. masco ts orcoat
ha ngers) hanging from the rear-view mirror. They
co uld otherwise trigger afalse alarm.
Do not leave anything on the armre stinthe cen-
tr e console, otherwise the function of the inte-
ri or mo tionsensor could be impaired.
Do not leav eany metal objects in contact with
ea ch other (e.g. keys on a key ring) in or near the
ar mrest or in thest owage compartment between
th e rear seats as they could trigger a false alarm.
These items should be kept in one of the other
lo ckable stowage compartme nts. Primi
ngthe in terior motion sens or
6 Close the stowage compartment on the
centre consol e.
6 Close the side windows and the soft
top.
6 Lock your vehicle.
The interior motion sensor is primed
after approximately 40 seconds. i
In some countries, the interior motion sen-
so ris primed even when the soft top is ope n.
You should onlypark the vehicle with the soft top
cl osed, however, so that falling leaves or insects,
for example, do not trigger a false alarm. Dea
ctivat ing the interior motion sensor
Deactivate the interior motion sensor if
people or animals are to remain in the
locked vehicle. This will prevent false
ala rms.
6 Turn the key to position 0or 1in the
ignition lock, or remove it.
6 Press button 1.
Indicator lamp 2in th ebutton flashes
bri efly.
The interior motion sensor remains deacti-
vated until you lock you rvehicle again. Interior motion sen
sor1
* (Cabrio let) P 54.25-3808-31209en_d2.boo Seite
75Diens tag, 25 .Mai 2004 7:26 19