2889584 - E7030 AIRBAG - Description
Description
The car may be fitted with an electronically-controlled
safety system that sets off the front seat belt pretensioners and
the driver's air bag, passenger air bag and sidebags in the case of
frontal and/or side impact of a certain severity.In the case of a side impact of a certain
magnitude, the corresponding side Air Bag and Window Bags are activated
(only on the side where the impact has taken place).An electronic control unit manages the entire
system by controlling all the components and activating the restraint
systems (pretensioners and airbags) as necessary.The control unit is located under the centre
console and is rigidly fixed to the bodyshell: in this way the deceleration
sensors located inside it are close to the centre of gravity and detect
deceleration for the entire vehicle accurately.There is an accelerometric sensor on the
two front door pillars which, in the case of a side impact, transmits
a signal to the control unit. This signal is also processed inside
the control unit which, as a result, decides on the operation of
the Side Bag and Window Bag on the side where the impact has taken
place.The driver's Air Bag module is located in
the centre of the steering wheel; A clock spring device allows the
airbag module connection leads to turn with the steering wheel without the
risk of breakage.The two front Air Bag modules have two stage
operation: the first stage is for slight impacts and the second
stage for more severe impacts. The two stages have two separate charges
which inflate the bag to 60% (first stage) and 40% (second stage).The two passenger Air Bag modules (two gas
generators which inflate a large single bag) are located in the
dashboard, fixed directly to the vehicle crossmember by a special bracket.The passenger Air Bag can be manually deactivated
via a special switch - which can be operated by a key - located
above the dashboard in the driver's glove compartment.With the key in the OFF position, the control
unit also controls the operation of the special 'passenger Air Bag
disabled' warning light.The Side Bag is housed in the outer part
of the exterior front seats.The window bags take the form of a curtain
which inflates and positions itself between the occupant's head
and the side windows. The folded bag is located under the roof panel, whilst
the rear pillar houses the gas generator.The front seat pretensioners are devices
built into the front seat belt reel. |
The belt fitted to the central
front seat is equipped with a mechanical pretensioner: see
Characteristic
of working principle 7065 SEAT BELTS AND ACCESSORIES
.
|
The control unit is self-diagnostic.
- it detects and memorizes any faults
- it recognizes the various components and the type of fault
- it signals the onset of these faults via the special warning
light.
System activations following a particularly
serious impact are memorized by the control unit.
For more details
Characteristic of working principle 5580C air bag system
.
The supply line for the system control unit
is protected by a special fuse next to the junction unit. |
When operations are carried out
to the Air Bag system the recommended safety instructions must be
followed precisely. For more details
Characteristic of working principle 5580C air
bag system |