199000625 - 5580C AIR BAG SYSTEM
PASSIVE SAFETY SYSTEM
The vehicle is equipped with an electronic control system that governs the activation of specific containment devices in the event of frontal or side impact:The frontal protection system includes:- driver and passenger front air bags with two-stage activation;- single-stage driver''s kneebag (option), single-stage passenger kneebag (currently not included in the specification);- front belts with pretensioner and load limiter;- decentred front impact detection sensor;The side protection system comprises:- two sidebags on the front seats in view;- two drop-down headbags housed in the under-roof rails;- two impact detection sensors located in the central pillar.The frontal protection system adopts an Air-Bag Smart 2 activation strategy that is able to adapt the activation parameters automatically 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.An ECS “Early Crash Sensor”, located on the front crossmember near the bonnet catch also helps the electronic control unit to cut in earlier than a conventional system. This means that the activation stage begins before the occupant begins to move toward the steering wheel or dashboard. | The Air Bag system components are designed to work on a specific vehicle. They therefore CANNOT be tampered with, adapted or installed on other types of vehicle. |
 | The car must be handed over to the customer with the passenger airbag deactivation switch in ON position and control panel warning lights off. |
| For safety reasons, NO continuity checks can be carried out on the wiring. |
| GRAVE DANGER! The front airbag module MUST be deactivated if a child seat is fitted to the front passenger seat.THIS MAY BE DISABLED BY MEANS OF THE CONTROL PANEL SETUP FUNCTION. |
| If the vehicle is equipped with sidebags, deactivation of the front passenger side airbag module also disables the side modules. |
COMPOSITION
The system consists of the following devices:- an electronic control unit;- driver and passenger front air bags with dual-stage activation;- driver''s kneebag with single stage activation;- a supplementary decentred impact detection sensor, the ECS (Early Crash Sensor);- two Side Bags on the front seats;- two window bag modules for the side protection of occupants;- two side impact sensors in the side pillars;- two electronic pretensioners on the front belts.The following indications show the system is working properly:- system fault warning light (red) on the instrument panel:- passenger air bag disabled warning light on the instrument panel;- front seat belt unfastened warning light on the instrument panel;- connection viai the B-CAN network with the diagnostic socket - for function checks using an EXAMINER.
ELECTRONIC CONTROL UNIT
The following diagram shows the control unit.
| The control unit must always be fitted with the arrow printed on the adhesive plate facing in the vehicle''s direction of motion.Always check that there are no foreign bodies between the control unit and the bodyshell and tighten the fixing bolts to the recommended torque. |
| If the control unit falls to the ground or is subject to abnormal knocks during handling, it MUST be replaced. |
Composition
The control unit contains an electronic deceleration sensor that enables safety device activation. This sensor consists of bi-directional accelerometers that complement the ECS front sensor and enhance the function of the side sensors.Operation
Frontal impact: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.Conversely, in the case of very severe impact, the control unit activates both stages almost simultaneously to absorb most of the kinetic energy from the occupant''s body before it strikes the steering wheel or dashboard.The supplementary ECS sensor also allows the airbag to be activated earlier than a conventional system so that the airbag activation stage is completed before the occupant''s body begins to move toward the steering wheel or dashboard.Side impact:Similarly, when side impact occurs, the control unit is able to recognise direction and intensity and thus activate both airbags present on the side affected by impact. To provide total cover against side impacts, two satellite sensors located in the centre pillars are used.When a side impact takes place, the satellite sensors detect the impact signal directly along the transverse axis of the vehicle and send it to the control unit. When processed by the control unit microprocessor, this signal reveals the severity of the side impact and is thus able to decide whether to operate the sidebags on the affected side, only if the control unit safety sensor enables the activation.The side airbags (window bag and Side Bag) are activated simultaneously and independently of the front safety devices.After each activation of one of the controlled systems (pretensioners, front airbags, sidebags), the control unit stores the activation in its permanent memory and controls activation of the fault warning light on the instrument panel.Before it is replaced, the control unit guarantees individual device activation for a maximum number of:- 3 impacts with activation of front seat belt pretensioners alone;-3 impacts in total (right or left) with side bag activation;- 1 impact with activation of the pretensioners and front airbags;- any combination of the above cases up to the maximum number.If one of the limits described is not reached, it will be possible to reuse the control unit after carrying out the RESET procedure using the EXAMINER once system operating conditions have been restored. The final activation, corresponding to the maximum number for the limits indicated above, will prevent further reset procedures.Control unit pin out
| PIN | SIGNAL |
|---|---|
| 1 | Earth |
| 2 | Ignition-operated power supply |
| 3 | (N.C.) |
| 4 | (N.C.) |
| 5 | (N.C.) |
| 6 | Front impact sensor earth |
| 7 | B-CAN A line |
| 8 | B-CAN B line |
| 9 | (N.C.) |
| 10 | (N.C.) |
| 11 | (N.C.) |
| 12 | Front impact sensor signal |
| 13 | Passenger air bag - first stage (-) |
| 14 | Passenger air bag - first stage (+) |
| 15 | Driver''s air bag - first stage (+) |
| 16 | Driver''s air bag - first stage (-) |
| 17 | Passenger air bag - second stage (-) |
| 18 | Passenger air bag - second stage (+) |
| 19 | Driver''s airbag - second stage (+) |
| 20 | Driver''s airbag - second stage (-) |
| 21 | (N.C.) |
| 22 | (N.C.) |
| 23 | Driver''s knee bag (+) |
| 24 | Driver''s knee bag (-) |
| PIN | SIGNAL |
|---|---|
| 1 | Passenger side impact sensor power supply |
| 2 | Driver side impact sensor power supply |
| 3 | Passenger side impact sensor earth |
| 4 | Driver side impact sensor earth |
| 5 | Driver''s seat belt fastened switch earth |
| 6 | Passenger seat belt fastened switch earth |
| 7 | Passenger presence sensor signal |
| 8 | (N.C.) |
| 9 | Passenger seat belt fastened switch signal |
| 10 | Driver''s seat belt fastened switch signal |
| 11 | Passenger presence sensor earth |
| 12 | (N.C.) |
| 13 | Passenger side head bag (-) |
| 14 | Passenger side head bag (+) |
| 15 | Driver side head bag (+) |
| 16 | Driver side head bag (-) |
| 17 | Passenger belt pretensioner (-) |
| 18 | Passenger belt pretensioner (+) |
| 19 | Driver''s belt pretensioner (+) |
| 20 | Driver''s belt pretensioner (-) |
| 21 | (N.C.) |
| 22 | (N.C.) |
| 23 | (N.C.) |
| 24 | (N.C.) |
| PIN | SIGNAL |
|---|---|
| 1 | Passenger side impact sensor power supply |
| 2 | Driver side impact sensor power supply |
| 3 | Passenger side impact sensor earth |
| 4 | Driver side impact sensor earth |
| 5 | Driver''s seat belt fastened switch earth |
| 6 | Passenger seat belt fastened switch earth |
| 7 | Passenger presence sensor signal |
| 8 | (N.C.) |
| 9 | Passenger seat belt fastened switch signal |
| 10 | Driver''s seat belt fastened switch signal |
| 11 | Passenger presence sensor earth |
| 12 | (N.C.) |
| 13 | Passenger side bag (-) |
| 14 | Passenger side bag (+) |
| 15 | Driver side bag (+) |
| 16 | Driver side bag (-) |
| 17 | Passenger belt pretensioner (-) |
| 18 | Passenger belt |
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