939003537 - 5580C AIR BAG SYSTEM
PASSIVE SAFETY SYSTEM
Introduction
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 knee bag, single-stage passenger''s knee bag (option);- front airbags with pretensioner on buckle and degressive load limiter;- direct mesh rear seat belts (without idler ring) and strap buckle branches- decentralised supplementary front impact detection sensor;- passenger air bag manual disabling switch.The side protection system comprises:- two sidebags under the fabric on the front seats;- two drop-down headbags housed in the under-roof rails;- two impact detection sensors located in the central pillar.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 first airbag activation stage and then, following a significant temperature increase, the second stage so that the energy discharged onto the occupant is not harmful.- for very severe impact, the control unit activates the second stage after a small temperature rise, i.e. almost immediately, so that as much of the occupant''s kinetic energy as possible can be absorbed before he or she strikes the steering wheel or dashboard.A supplementary ECS “Early Crash Sensor” on the front beam near the bonnet lock 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 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 the ON position and control panel warning light 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. |
| If the vehicle is equipped with a side bag, deactivation of the front passenger side airbag module does not disable the side modules. This means that any children carried in the car are protected against side impact. |
Composition
The system consists of the following devices:- an electronic control unit;- two (driver and passenger) front air bags with dual stage activation,- a driver''s knee bag with single-stage activation as standard,- a driver''s knee bag with single-stage activation as an option,- an ECS decentralised supplementary impact detection sensor (Early Crash Sensor),- passenger air bag manual disabling switch,- two sidebags under the fabric 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 seats.The following indications show the system is working properly:- system fault warning light (red) in the instrument panel:- passenger air bag disabled warning light on the front courtesy light;- front seat belts not fastened warning light (in the front courtesy light until DEC 05 and later on in the instrument panel)- connection via B- CAN with the diagnostic socket - integral with the Body Computer - to test operation via the EXAMINER.
Electronic control unit
The following diagram shows the control unit.
| The control unit should always be fitted with the arrow, stamped on the adhesive plate, facing the direction of travel of the vehicle. 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. |
| PIN | SIGNAL |
| 1 | Earth |
| 2 | Ignition-operated power supply |
| 3 | (N.C.) |
| 4 | (N.C.) |
| 5 | Front impact sensor earth |
| 6 | (N.C.) |
| 7 | B-CAN A line |
| 8 | B-CAN B line |
| 9 | Passenger Air Bag disablement key (+) |
| 10 | Passenger Air Bag disablement key (-) |
| 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 | Passenger knee bag (-) |
| 22 | Passenger knee bag (+) |
| 23 | Driver''s knee bag (+) |
| 24 | Driver''s knee bag (-) |
| PIN | SIGNAL |
| 1 | Driver side head bag (-) |
| 2 | Driver side head bag (+) |
| 3 | Passenger side head bag (+) |
| 4 | Passenger side head bag (-) |
| 5 | Driver side bag (-) |
| 6 | Driver side bag (+) |
| 7 | Passenger side bag (+) |
| 8 | Passenger side bag (-) |
| 9 | (N.C.) |
| 10 | (N.C.) |
| 11 | (N.C.) |
| 12 | (N.C.) |
| 13 | Driver''s belt pretensioner (-) |
| 14 | Driver''s belt pretensioner (+) |
| 15 | Passenger belt pretensioner (+) |
| 16 | Passenger belt pretensioner (-) |
| 17 | (N.C.) |
| 18 | Passenger presence sensor signal |
| 19 | Driver''s seat belt fastened switch signal |
| 20 | Passenger seat belt fastened switch signal |
| 21 | Driver side impact sensor earth |
| 22 | Seat belts not fastened buzzer signal |
| 23 | Passenger side impact sensor earth |
| 24 | (N.C.) |
| 25 | Passenger Air Bag disabled warning light |
| 26 | Seat belt not fastened warning light |
| 27 | Driver side impact sensor power supply |
| 28 | Passenger side impact sensor power supply |
| 29 | (N.C.) |
| 30 | (N.C.) |
| 31 | (N.C.) |
| 32 | (N.C.) |
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