engine MERCEDES-BENZ SLK ROADSTER 2008 Owners Manual

5
COMAN
D. . . . . . . . . . . . . . . . . . . . . . . .94
On-board computer . . . . . . . . . . . . .94
Constant headlamp mod e
Setting (on-board computer) . . . . .104
Consumption statistics (on-board
computer) . . . . . . . . . . . . . . . . . . . . . .107
Coolan t. . . . . . . . . . . . . . . . . . . . . . . .154
Checking the level . . . . . . . . . . . . .154
Display message . . . . . .180, 181, 182
Mixture ratio . . . . . . . . . . . . . . . . .259
Temperature gauge . . . . . . . . . . . . .96
Cruise control . . . . . . . . . . . . . . . . . .109
Display message . . . . . . . . . . . . . .179
Cup holde r. . . . . . . . . . . . . . . . . . . . .136 D
Dashboar d
see Cockpit
Date
Setting (on-board computer) . . . . .103
Daytime driving lights
see Constant headlamp mode
Delayed switch-off
Exterior lighting (on-board com-
puter) . . . . . . . . . . . . . . . . . . . . . . .105
Interior lighting (on-board com-
puter) . . . . . . . . . . . . . . . . . . . . . . .105
Digital speedometer . . . . . . . . . . . . ..96 Dipped-beam headlamps
Automatic headlamp mode* . . . . . .74
Display message . . . . . . . . . . . . . .182
Symmetrical . . . . . . . . . . . . . . . . . .164
Display messag e. . . . . . . . . . . . . . . .174
Service . . . . . . . . . . . . . . . . . . . . . .165
Symbol messages . . . . . . . . . . . . .179
Text messages . . . . . . . . . . . . . . . .175
Up (AMG menu) . . . . . . . . . . . . . . . .96
Door
Automatic locking . . . . . . . . . . . . . .57
Display message . . . . . . . . . . . . . .179
Emergency locking . . . . . . . . . . . . .211
Emergency unlocking . . . . . . . . . . .210
Opening (from the inside) . . . . . . . .57
Door control panel
Overview . . . . . . . . . . . . . . . . . . . . .33
Draught stop . . . . . . . . . . . . . . . . . . .135
Drinks holde r
see Cup holder
Driver's airbag . . . . . . . . . . . . . . . . . . .42
Driver's seat position . . . . . . . . . . . ..71
Driving abroad . . . . . . . . . . . . . . . . . .164
Driving safety syste m. . . . . . . . . . . . .50
ABS . . . . . . . . . . . . . . . . . . . . . . . . .50
BAS . . . . . . . . . . . . . . . . . . . . . . . . .50
ESP ®
. . . . . . . . . . . . . . . . . . . . . . . .51
Driving syste m. . . . . . . . . . . . . . . . . .109
Cruise control . . . . . . . . . . . . . . . .109 Parktroni
c.. . . . . . . . . . . . . . . . . .115
Speedtronic . . . . . . . . . . . . . . . . . .112
Driving tip
Braking . . . . . . . . . . . . . . . . . . . . . .162
Driving abroad . . . . . . . . . . . . . . . .164
Driving on flooded road s.. . . . . ..164
Driving on wet road s.. . . . . . . . ..164
Winter . . . . . . . . . . . . . . . . . . . . . .161
DVD audio
Operation (on-board computer) . . . .99
DVD video
Operation (on-board computer) . . . .99 E
Easy-entry/exit feature Activating/deactivating (on -
board computer) . . . . . . . . . . . . . .106
Easy-entry feature . . . . . . . . . . . . . . ..65
Easy-exit feature . . . . . . . . . . . . . . . . .65
Electrical/electronic equipment Retrofittin g.. . . . . . . . . . . . . . . . . .241
Electronic Stability Program
see ESP ®
e mark . . . . . . . . . . . . . . . . . . . . . . . . .241
Emergency engine starting . . . . . ..236
Emergency key element Lost . . . . . . . . . . . . . . . . . . . . . . . .207
Emergency locking
Vehicle . . . . . . . . . . . . . . . . . . . . . .211 Index
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6
Emergency running mod
e
Automatic transmission . . . . . . . . .203
Emergency unlocking
Boot . . . . . . . . . . . . . . . . . . . . . . . .211
Vehicle . . . . . . . . . . . . . . . . . . . . . .210
Engine
Display message . . . . . . . . . . . . . .187
Running irregularl y.. . . . . . . . . . . .201
Starting problems . . . . . . . . . . . . .201
Starting with the key . . . . . . . . . . . .81
Technical data . . . . . . . . . . . . . . . .244
Engine diagnostic warning lamp . ..1 95
Engine electronics . . . . . . . . . . . . . ..241
Malfunction . . . . . . . . . . . . . . . . . .201
Engine number . . . . . . . . . . . . . . . . . .243
Engine oil . . . . . . . . . . . . . . . . . . . . . .258
Checking the oil level (dipstick) . . .153
Checking the oil level (on-board
computer) . . . . . . . . . . . . . . . . . . .152
Consumption . . . . . . . . . . . . . . . . .151
Display message . . . . . . . . . . . . . . . . . . .152, 186, 187
Filler neck . . . . . . . . . . . . . . . . . . .153
Temperature display (on-board
computer) . . . . . . . . . . . . . . . . . . . .96
Topping up . . . . . . . . . . . . . . . . . . .153
ESP ®
(Electronic Stability Program) .51
Activating/deactivating . . . . . . . . . .51
Display message . . . . . . . . . .176, 177
Warning lamp . . . . . . . . . . . . . .51, 194 Exterior lighting
Delayed switch-off (on-board
computer) . . . . . . . . . . . . . . . . . . .105
Exterior mirror parking position
Storing . . . . . . . . . . . . . . . . . . . .67, 69
Exterior mirrors
Adjusting . . . . . . . . . . . . . . . . . . . . .66
Anti-dazzle mode (automatic) . . . . .67
Folding in/out (automatically ).. . . .66
Folding in/out (electrically) . . . . . . .66
Folding in when locking (on-board
computer) . . . . . . . . . . . . . . . . . . .106
Malfunction . . . . . . . . . . . . . . . . . .206
Parking position . . . . . . . . . . . . .67, 69
Resetting . . . . . . . . . . . . . . . . . . . . .66
Storing settings . . . . . . . . . . . . . . . .68
Exterior view
Overview . . . . . . . . . . . . . . . . . . . . .18 F
Fire extinguishe r. . . . . . . . . . . . . . . .174
First-aid kit . . . . . . . . . . . . . . . . . . . . .174
Flat tyre Preparing the vehicle . . . . . . . . . . .218
TIREFIT kit . . . . . . . . . . . . . . . . . . .219
Floormat . . . . . . . . . . . . . . . . . . . . . . .146
Foglamps Display message . . . . . . . . . . . . . .185
Fording . . . . . . . . . . . . . . . . . . . . . . . .164 Frequencies
Garage door opene r.. . . . . . . . . . .262
Telephone . . . . . . . . . . . . . . . . . . .242
Front airbag . . . . . . . . . . . . . . . . . . . . .42
Front-passenger airbag . . . . . . . . . . ..42
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . .255
Loss . . . . . . . . . . . . . . . . . . . . . . . .200
Petrol . . . . . . . . . . . . . . . . . . . . . . .149
Fuel consumptio n. . . . . . . . . . .256, 257
Fuel filler flap Opening/closing . . . . . . . . . . . . . .148
Fuel lin e
Malfunction . . . . . . . . . . . . . . . . . .200
Fuel tank
Malfunction . . . . . . . . . . . . . . . . . .200
Fuse allocation chart . . . . . . . . . . ..237
Fuse box Boot . . . . . . . . . . . . . . . . . . . . . . . .238
Dashboard . . . . . . . . . . . . . . . . . . .238
Engine compartment . . . . . . . . . . .238
Fuse s. . . . . . . . . . . . . . . . . . . . . . . . . .237 G
Garage door Opening/closing (with the remote
control) . . . . . . . . . . . . . . . . . . . . .145
Garage door opener . . . . . . . . . . . . ..144
Clearing the memory . . . . . . . . . . .146 Index
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7
Frequencies . . . . . . . . . . . . . . . . .
.262
Programming the remote control . .144
Gear indicator (on-board computer) .96
Gearshift program Manua l.. . . . . . . . . . . . . . . . . . . . . .88
Genuine Mercedes-Benz parts . . . ..240
Glove compartment . . . . . . . . . . . . ..138
Golf bag Storage location . . . . . . . . . . . . . . .138
Gross vehicle weight, maximum
permissible . . . . . . . . . . . . . . . . . . . . .253 H
Handbrake Display message . . . . . . . . . . . . . .181
Head/thorax airbags . . . . . . . . . . . . ..43
Headlamp Misting up . . . . . . . . . . . . . . . . . . .205
Headlamp mode (automatic ). . . . . . .74
Headlamps Cleaning . . . . . . . . . . . . . . . . . . . . .168
Cleaning system . . . . . . . . . . . . . . . .76
Headlamps delayed switch-off
see Exterior lighting delayed switch-off
Head restraint
Adjusting (front) . . . . . . . . . . . . .60, 61
Heatin g
see Air conditioning
High-pressure cleaners . . . . . . . . . ..167 HomeLink
®
see Garage door opener I
Immobiliser . . . . . . . . . . . . . . . . . . . . .52
Indicator and warning lam p
Brakes (red) . . . . . . . . . . . . . . . . . .194
Engine diagnostic . . . . . . . . . . . . . .195
ESP ®
. . . . . . . . . . . . . . . . . . . .51, 194
PASSENGER AIRBAG OFF . . . .46, 191
Reserve fuel . . . . . . . . . . . . . . . . . .197
Seat belt . . . . . . . . . . . . . . . . . . . . .195
SRS . . . . . . . . . . . . . . . . . . . . .39, 194
Indicator and warning lamps . . . . ..193
Indicator lamp see Indicator and warning lamp
Instrument cluster . . . . . . . . . . . . . ..90
Overview . . . . . . . . . . . . . . . . . . . . .24
Selecting the language (on-board
computer) . . . . . . . . . . . . . . . . . . .102
Instrument lighting . . . . . . . . . . . . . ..90
Interior lightin g. . . . . . . . . . . . . . . . . .77
Automatic contro l.. . . . . . . . . . . . .77
Delayed switch-off (on-boar d
computer) . . . . . . . . . . . . . . . . . . .105
Emergency lighting . . . . . . . . . . . . . .77
Manual control . . . . . . . . . . . . . . . . .78
Reading lamp . . . . . . . . . . . . . . . . . .78
Interior motion sensor . . . . . . . . . . ..54 Intermittent wipe
Windscreen wiper s.. . . . . . . . . . . . .79 J
Jack Operation . . . . . . . . . . . . . . . . . . . .225
Storage location . . . . . . . . . . . . . . .172
Jump-starting . . . . . . . . . . . . . . . . . . .233
Jump leads . . . . . . . . . . . . . . . . . . .233 K
Key . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Changing the battery . . . . . . . . . . .212
Checking the battery . . . . . . . . . . .212
Closing the roof . . . . . . . . . . . . . . .134
Display message . . . . . . . . . .184, 187
Factory setting . . . . . . . . . . . . . .56, 57
Loss . . . . . . . . . . . . . . . . . . . . . . . .207
Malfunction . . . . . . . . . . . . . . . . . .207
Modifying the programming . . . . . . .56
Opening the roof . . . . . . . . . . . . . .134
Key position s
Key . . . . . . . . . . . . . . . . . . . . . . . . . .59
Kickdown . . . . . . . . . . . . . . . . . . . .87, 89 Index
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11
Speedometer
Digital speedometer (on-board
computer) . . . . . . . . . . . . . . . . . . . .96
Setting the unit (on-board com-
puter) . . . . . . . . . . . . . . . . . . . . . . .102
Speedtronic . . . . . . . . . . . . . . . . . . . .112
Display message . . . . . . . . . . . . . .179
Permanent . . . . . . . . . . . . . . . . . . .114
Variabl e.. . . . . . . . . . . . . . . . . . . .113
SRS (Supplemental Restraint Sys-
tem) . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
warning lamp . . . . . . . . . . . . . . . . . .39
Standard display (on-board com-
puter) . . . . . . . . . . . . . . . . . . . . . . . . . .95
Station see Radio
Status line (on-board computer) . . ..92
Selecting the display . . . . . . . . . . .103
Steering wheel
Adjusting . . . . . . . . . . . . . . . . . .63, 64
Buttons (on-board computer) . . . . . .91
Storing settings . . . . . . . . . . . . . . . .68
Steering wheel gearshift paddles . ..8 8
Steering wheel heating . . . . . . . . . . ..64
Stowage compartment . . . . . . . . . ..138
Armrest (under) . . . . . . . . . . . . . . .138
Centre console . . . . . . . . . . . . . . . .139
Glove compartment . . . . . . . . . . . .138
Stowage compartments
Overview . . . . . . . . . . . . . . . . . . . . .34 Stowage space
Cup holder . . . . . . . . . . . . . . . . . . .136
Rear wall . . . . . . . . . . . . . . . . . . . .139
Stowage well
Boot floor (underneath) . . . . . . . . .137
Submenu (on-board computer) . . ..1 01
Instrument cluster . . . . . . . . . . . . .102
Lighting . . . . . . . . . . . . . . . . . . . . .102
Vehicle . . . . . . . . . . . . . . . . . . . . . .102
Sun viso r. . . . . . . . . . . . . . . . . . . . . . .140
Supplemental Restraint Syste m
see SRS
Supplemental Restraint System (SRS)
Display message . . . . . . . . . . . . . .178
Warning lamp . . . . . . . . . . . . . . . . .194
Surround lighting
Switching on/off (on-board com-
puter) . . . . . . . . . . . . . . . . . . . . . . .104
Switching off the alarm
ATA . . . . . . . . . . . . . . . . . . . . . . . . . .53 T
Tail lamps Display message . . . . . . . . . . . . . .186
Tank capacity . . . . . . . . . . . . . . . . . . .255
Tank content Calling up the range (on-board
computer) . . . . . . . . . . . . . . . . . . .107 Technical data
Acceleration . . . . . . . . . . . . . . . . . .245
Engine . . . . . . . . . . . . . . . . . . . . . .244
Speed . . . . . . . . . . . . . . . . . . . . . . .245
Tyres . . . . . . . . . . . . . . . . . . . . . . .247
Vehicle dimensions . . . . . . . . . . . .253
Vehicle weights . . . . . . . . . . . . . . .253
Wheels . . . . . . . . . . . . . . . . . . . . . .247
Telephone
see Mobile phone
Temperature
Engine oil (on-board computer) . . . .96
Outside temperature . . . . . . . . . . . .91
Thermatic
Malfunction indicator lamp . . . . . .191
Thermotroni c
Malfunction indicator lamp . . . . . .191
Third brake lamp
Display message . . . . . . . . . . . . . .184
Tightening torque . . . . . . . . . . . . . ..229
Time Lap time (on-board computer) . . . . .97
Setting (on-board computer) . . . . .103
Setting the time (on-board com-
puter) . . . . . . . . . . . . . . . . . . . . . . .103
Timer (on-board computer) . . . . . . . ..97
TIREFIT kit Using . . . . . . . . . . . . . . . . . . . . . . .219
Total distance recorder . . . . . . . . . . ..95
Resetting the trip meter . . . . . . . . . .90 Index
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Protection of the environment
14 Protection of the environment
H
Environmental not
e
Daimler's declared policy is one of integra -
ted environmental protection.
The objectives are for the natural resource s
which form the basis of our existence on
this planet to be used sparingly and in a
manner which takes the requirements of
both nature and humanity into account.
You too can help to protect the environ-
ment by operating your vehicle in an envi-
ronmentally-responsible manner.
Fuel consumption and the rate of engine,
transmission, brake and tyre wear depend
on the following factors:
R Operating conditions of your vehicle
R Your personal driving style
You can influence both factors.
You should bear the following in mind:
Operating condition s
R Avoid short trips as these increase fuel
consumption.
R Make sure that the tyre pressures are
always correct.
R Do not carry any unnecessary weight. R
Keep an eye on the vehicle's fuel con-
sumption.
R Remove roof racks once you no longer
need them.
R A regularly serviced vehicle will contrib-
ute to environmental protection. Yo u
should therefore adhere to the service
intervals.
R Always have maintenance work carrie d
out at a qualified specialist workshop,
e.g. a Mercedes-Benz Service Centre.
Personal driving style
R Do not depress the accelerator peda l
when starting the engine.
R Do not warm up the engine with the vehi-
cle stationary.
R Drive carefully and maintain a safe dis-
tance from the vehicle in front.
R Avoid frequent, sudden acceleration.
R Change gear in good time and use eac h
gear only up to 2
/ 3of its maximum engine
speed.
R Switch off the engine in stationary traffic. Returning used vehicle
s
Mercedes-Benz will take back your
Mercedes-Benz to dispose of it in an environ-
mentally-responsible manner, in accordance
with the European Union (EU) End of Life
Vehicles Directive.
The End of Life Vehicles Directive applies to
vehicles of up to 3.5 t gross vehicle weight, in
accordance with national regulations. For
several years, Mercedes-Benz has been
meeting all the legal requirements for a
design which allows for recycling and re-use.
There is a network of return points and dis-
assembly plants which can recycle your vehi-
cle in an environmentally-responsible man-
ner. The options for recycling vehicles and
parts are constantly being developed and
improved. This means that your Mercedes-
Benz will also continue to meet even the
increased recycling quotas in the future in
good time. You can obtain further information
from your national Mercedes-Benz homepage
or your national hotline number. Introduction
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Operating safet
y 15Operating safet
y G
Risk of accident and injury
All work on the vehicle and, in particular,
work relevant to safety or on safety-relate d
systems must be carried out at a qualified
specialist workshop. The specialist work-
shop must have the necessary specialist
knowledge and tools to carry out the work
required. Mercedes-Benz recommends
that you use a Mercedes-Benz Service
Centre for this purpose. G
Risk of accident and injury
Some safety systems only function when
the engine is running. You should therefore
never switch off the engine when driving .
Otherwise the safety systems of your vehi-
cle may no longer protect you and other
persons as intended. In addition, there is
the danger that you may lose control of your
vehicle and thus cause an accident. G
Risk of accident and injury
Work carried out incorrectly, or alterations
made to the vehicle, e.g. rerouting of cable s
under coverings, could cause the safet y
systems of your vehicle to stop working
properly. The safety systems would thus no longer protect you and other persons as
intended. In addition, there is the danger
that you may lose control of your vehicle
and thus cause an accident.
All work and alterations to the vehicle, e.g.
installations or modifications, should there-
fore be carried out at a qualified specialist
workshop.
G
Risk of accident
A heavy impact to the underbody, tyres or
wheels, for example when bottoming out on
rough terrain or driving over an obstacle at
high speed, could damage your vehicle. As
a result, you could cause an accident. Thi s
also applies to vehicles which are equippe d
with underbody protection .
For this reason, drive slowly over obstacles,
avoid bottoming out the vehicle in rough
terrain and, if necessary, have your vehicle
checked at a qualified specialist workshop. G
Risk of accident
If work on electronic equipment and its
software is carried out incorrectly, this
equipment could stop working. The elec-
tronic systems are networked via interfa-
ces. Tampering with these electronic sys-
tems could cause malfunctions in systems which have not been modified. Malfunc-
tions such as these can seriously jeopard
-
ise the vehicle's operating safety and
therefore your own safety.
You should thus have all work and modifi-
cations to electronic components carried
out at a qualified specialist workshop. Introduction
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Exterior view
19Function Pag
e 1 Boot
Opening and closing 58
2 Rear window heatin
g 130
3 Fuel filler fla
p 148
Fuel requirements 149
4 Doors
Opening and closing 56
Opening/closing in an
emergency
210
5 Exterior mirrors
66
6 Roof
Opening and closin
g 132
Draught stop 135
Boot separator 134
7 Cleaning the windows
16
7 8 Windscreen wipers
78 Function Page
9 Opening the bonnet
150
Engine oil 151
Coolant 154
Vehicle battery 230
a Front lights
215
b Towing
234
c Headlamp cleaning system
76
d Wheels and tyres
155
Tyre pressure loss warning
system
158
Flat tyre 218
Vehicle tool kit 172
Spare wheel* 172,
225 e Rear lights
21
6 f Towing
234 At a glance
* optional
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Instrument cluste
r 25Function Page
1 1
SRS warning lamp 194
2 -
ABS warning lamp 193
3 L
Turn signal indicator
lamp, left 75
4
v
ESP®
warning lamp 19
4 5 K
Turn signal indicator
lamp, right 75
6 3
Brake system warn-
ing lamp 194
7 Multi-function display
92
8 Total distance recorder
95
9 Trip meter
90
a ±
Engine diagnostic
warning lamp 195
b Rev counter
90 Function Page
c <
Seat belt warning
lamp 195
d A
Main-beam indicator
lamp 75
e Fuel gaug
e f Fuel filler flap location indi
-
cator: the fuel filler cap is to
the rear on the right-hand
sid e g A
Reserve fuel warnin g
lamp 197
h
Automatic transmission*
:
gearshift program display 85
j
Automatic transmission*
:
selector lever position dis-
play 85 Function Page
k Status indicator, display
depends on the settings in
the on-board computer:
outside temperature
1
or
digital speedometer 96
l Speedtronic*: set limit
speed
112
m Cloc
k 104
n Speedometer (can be set to
display miles in the on-
board computer)
102
o Reset button
p Adjustment button for
instrument cluster illumina
-
tio n 90
q Adjustment button for
instrument cluster illumina
-
tio n 90
1
Vehicles in the UK: the digital speedometer is always displayed instead of the outside temperature. At a glance
* optional
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Instrument cluste
r 27Function Page
1 SRS warning lamp
194
2 ABS warning lamp
193
3 Turn signal indicator lamp,
left
75
4
ESP
®
warning lamp 19
4 5 Turn signal indicator lamp,
right
75
6 Brake system warning lamp
194
7 Multi-function display
92
8 Total distance recorder
95
9 Trip meter
90
a Engine diagnostic warning
lamp
195
b Rev counter
90
c Seat belt warning lamp
195
d Main-beam indicator lamp
75 Function Page
e Fuel gaug
e f Fuel filler flap location indi
-
cator: the fuel filler cap is to
the rear on the right-hand
sid e g Reserve fuel warning lamp
19
7 h
Automatic transmission*
:
gearshift program display 85
j
Automatic transmission*
:
selector lever position dis-
play 85
k Status indicator, display
depends on the settings in
the on-board computer:
outside temperature
2
or
digital speedometer 96
l Speedtronic: set limit
speed
112
m Cloc
k 104 Function Page
n Speedometer
o Reset button
p Adjustment button for
instrument cluster illumina
-
tio n 90
q Adjustment button for
instrument cluster illumina
-
tio n 90
2
Vehicles in the UK: the digital speedometer is always displayed instead of the outside temperature. At a glance
* optional
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Occupant safet
y 39In particular, work relevant to safety or on
safety-related systems must be carried out
at a qualified specialist workshop. If this
work is not carried out correctly, the oper-
ating safety of your vehicle may be affec -
ted. There is a risk of an accident and injury .SRS (Supplemental Restraint System)
The SRS reduces the risk of occupants com-
ing into contact with the vehicle's interior in
the event of an accident. It can also reduce
the forces to which occupants are exposed
during an accident.
The SRS consists of:
R 1 warning lamp
R belt tensioner s
R belt force limiters
R Airbag s
11 warning lam p The SRS functions are checked regularly
when you turn on the ignition and when the
engine is running. Malfunctions can therefore
be detected in good time. The
1 warning lamp in the instrumen t
cluster lights up when the ignition is switched
on. It goes out no later than a few seconds
after the engine is started. G
Risk of injury
If SRS is malfunctioning, individual systems
may be activated unintentionally or not be
triggered in the event of an accident with
heavy braking.
A malfunction has occurred if the 1
warning lamp:
R does not light up when you switch on the
ignition
R does not go out after the engine has been
running for a few seconds
R lights up again once the engine is running
In this case, have SRS checked immedi-
ately at a qualified specialist workshop.
Triggering of belt tensioners, belt force
limiters and airbags In the event of a collision, the sensor in the
airbag control unit evaluates important phys-
ical data such as duration, direction and force
of the vehicle deceleration or acceleration.
Based on the evaluation of this data anddepending on the vehicle's rate of longitudi-
nal deceleration in a collision, in the firs
t
stage the airbag control unit pre-emptively
triggers the belt tensioners.
i The belt tensioners can only be triggered
if the belt tongue is correctly engaged in the
seat belt buckle.
The front airbags are only deployed if there is
an even higher rate of vehicle deceleration in
a longitudinal direction .
Vehicles fitted with adaptive, dual-stage front
airbags: when the first deployment threshold
is reached, the front airbag is filled with
enough gas to reduce the risk of injuries. The
front airbag is only fully inflated if a second
threshold is reached within a few millisec-
onds due to the control unit having detected
further deceleration.
Criteria for triggering belt tensioners and
airbags
In the first stage of a collision, the airbag con-
trol unit evaluates the duration and direction
of vehicle acceleration or deceleration in
order to determine whether it is necessary to
trigger the belt tensioner and/or airbag.
The belt tensioner and airbag triggering
thresholds are variable and are adapted to the
rate of deceleration of the vehicle. This proc- Safety
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