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- Always move the passenger seat into its
rearmost position in the seat's fore and
aft adjustment range, as far away from
the a irbag as poss ible, before installing
the forward-facing child restraint. The
backrest must be adjusted to an upr ight
posit ion.
- Make sure that the PASSENGER AIR BAG
OFF light comes on and stays on all the
t ime w henever the ignition is sw itched
on.
Advanced Airbag System components
The fron t passenger seat in your vehicle has a
lot of very important parts of the Advanced
Airbag System in it. These parts include the
weight-sensing
mat, sensors, wiring, brack -
ets, and more. The function of the system in
the front passenger seat is checked by the
e lectronic control unit when the ignit ion is on .
The control unit mon itors the Advanced Air-
bag System and turns the airbag indicator
light on whe n a ma lfunction in t he sys t em
components is de t ected. The function of the
airbag indicator light is described in greater
detai l below . Because the front passenger
seat contains important parts of the Ad-
vanced Airbag System, you must take care to
prevent it from being damaged. Damage to
the seat may prevent the Advanced Airbag for
the front passenger seat from doing its job in
a crash .
The front Advanced Airbag System
consists of the following:
- Crash sensors in the front of the veh icle that
measure veh icle acceleration/decele
ration
to provide information to the Advanced Air-
bag System about the seve rity of the crash.
- An electronic cont rol unit, with integrated
crash se nsors for front and side impacts .
The cont rol unit "decides " whethe r to fire
the front airbags based on the inform ation
received from the crash senso rs. The contro l
unit a lso "decides" whether the safety belt
pretensioners should be activated .
A irbag sys tem
167
- An Advanced Airbag with gas gene rator and
contro l valve fo r the driver ins ide the steer -
ing wheel hub.
- An Advanced Airbag w ith gas gene rator and
contro l valve inside the instrument pane l for
the front passenger.
- A weight-sensing mat under the upholstery
padding of the front passenger seat cushion
that measures the total weight on the seat.
The informat ion reg istered is sent continu-
ously to the electronic control unit to regu-
late deployment of the front Advanced Air-
bag on the passenger side.
- An airbag monitor ing system and ind icator
light in the instrument cluster
q
page 171 .
- A sensor in each front seat registers the dis-
tance between the respective seat and the
steer ing whee l or inst rument panel. The in-
forma t ion registered is sent cont inuo usly to
t he elect ron ic cont ro l uni t to regula t e de -
ployment of the front Advance d Airbags .
- The PASSENGER AIR BAG OFF ligh t comes
on and st ays on in the cen t er of t he instr u-
ment panel
q
page 1 71, fig. 178
and t ells
you whe n the front Advanced Airbag on the
passenger side has been tu rned off .
- A sensor below the safety be lt latch for the
front seat passenger to measure the tension
on the safety be lt . The tension on the safety
be lt and the weight registered by the
weight-sensing
mat he lp the control unit
"decide" whether the front a irbag for the
front passenge r seat should be turned off or
not ~
pag e 161, Child restraints on the
front seat - some important things to
know.
- A senso r in the safety belt latch fo r the d riv-
er a nd fo r the fro nt seat passenger t ha t
senses whethe r that safe ty belt is latched or
no t and transmi t s this informa t ion to the
electronic control unit.
_&.
WARNING
Damage to the front passenger seat can
prevent the front airbag from work ing
properly.
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