312001152 - E7030 AIR BAG - DESCRIPTION

DESCRIPTION

The vehicle is equipped with an electronic control system that governs the acivation of specific containment devices in the event of frontal impact.An electronic control unit manages the entire system.
The Air Bag control unit (NAB) connectors differ depending on the version. This is necessary to prevent fitting an incorrect control unit from the Parts Dept. (foolproof logic).
The frontal protection system includes:

  • Driver and passenger front air bags with two-stage activation;
  • driver and passenger pretensioners with dual retaining action;
  • additional impact detection sensor on front crossmember (ECS).
The front protection system features new Air Bag Smart 2 activation software that automatically adapts activation parameters according to impact severity.Driver and passenger front airbags feature two-stage activation:

  • when the impact is of moderate severity, the electronic control unit controls the air bag first activation stage and then the second stage after a certain delay to ensure that the energy discharged onto the occupant is not harmful;
  • for very severe crashes, the control unit activates the first and second stage with a very slight delay in order to absorb the occupant''s greater kinetic energy before he strikes the steering wheel or dashboard.
A supplementary ECS “Early Crash Sensor” on the front crossmember near the engine cooling radiator also helps the electronic control unit to operate more quickly than a conventional system so that the airbag activation stage is completed before the occupant''s body begins to move towards the steering wheel or dashboard.The control unit is located under the centre console and is securely fastened to the bodyshell: in this way the deceleration sensors located inside the unit are near the centre of gravity and detect the deceleration for the entire vehicle accurately.The Air Bag module is fitted in the centre of the steering wheel. it is fitted on a rocker plate that allows the horn to be operated. The plate houses a metal container that contains the folded bag and the gas generation device that inflates the bag.A clock spring allows the connecting cables for the Air Bag module to follow the rotation of the steering wheel without danger of breaking.The passenger Air Bag is located on the dashboard, and is fastened directly to the vehicle crossmember by means of a special bracket.The driver and passenger pretensioners with dual retaining action are integrated respectively in the seat belt reel and in the third point mounting for the actual seat belts (pyrotechnic pretensioners) near the area of the running board. Their simultaneous activation is designed to take up slack in the seat belt to ensure it holds the occupant against the backrest from the first moments of impact, thus reducing movement inside the passenger compartment.The seat belts are also equipped with a load limiter which makes it possible to adjust the force acting on one''s chest and shoulders during the retaining action of the belts in the case of a frontal impact.The control unit is equipped with a self-diagnostic function:

  • it detects and stores faults;
  • it recognises the various components and the fault type;
  • it indicates the onset of faults by means of the special warning light.
The activation of the system following a particularly serious impact is memorized by the control unit.When the system autodiagnostic function detects a fault or an impact is recorded, the control unit sends a signal, via the CAN, for the the activation of the Air Bag fault warning light located in the instrument panel.Similarly, the passenger side air bag disabling warning light is lit up.The front passenger air bag can be deactivated following the specific instructions from the multifunction display using the buttons on the right of the instrument panel.
The function of deactivating the passenger air bag is activated using the dedicated buttons to the right of the instrument panel in the set up menu in the actual panel and not using the key!! When it is deactivated the warning light in the instrument panel comes on.
For more details,    See descriptions 5580C AIR BAG SYSTEM The system control unit supply line is protected by a specific Body Computer fuse.
When operations are carried out to the Air Bag system, the following safety recommendations must be closely followed. For more details,
    Op. 5580C AIR BAG SYSTEM