312002030 - PASSIVE SAFETY SYSTEM
PASSIVE SAFETY SYSTEM
The vehicle is equipped with an electronic control system that governs the acivation of specific containment devices in the event of frontal or side impact.The frontal protection system includes:
- dual activation stage driver''s front Air Bag;
- dual activation stage passenger front Air Bag;
- driver''s kneebag (optional);
- front seat belts with dual pretensioner and load limiter;
- additional front impact detection sensor.
The side protection system comprises:
- two Side Bags housed in the front seats (optional);
- two drop-down headbags housed in the under-roof rails (optional);
- two impact detection sensors located in the central pillars.
The dual stage driver''s front air bags, driver and passenger, are both capable of automatically adapting the activation parameters depending on the seriousness of the impact:
- when the impact is of moderate severity, the electronic control unit controls the first air bag activation stage so 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.
- for medium severity impacts the second stage is also activated after a preset time to ensure the charge is used fully.
- an ECS early crash sensor, located on the front crossmeber near the bonnet lock, helps the electronic control unit to anticipate the intervention of all the front air bags.
 | The airbag system components are designed to work on a specific vehicle. They therefore CANNOT be tampered with, adapted or installed on other types of vehicle. |
| For safety reasons, NO continuity checks can be carried out on the wiring. |
The electrical connection between the airbag system components is via dedicated wiring built into the dashboard cable loom and the rear cable loom.The control unit is connected to the system via two connectors, one for the dashboard lead and the other for the rear lead.The control unit is connected to the vehicle CAN network through which it exchanges information with the other nodes, turns on the instrument panel warning lights and carries out diagnostic operations.Because the control unit is a node in the CAN, the airbag system is connected:
- to the standard diagnostic socket via the CAN
- to the instrument panel, again via the CAN, to control the airbag system failure, seat belt unfastened and passenger airbag deactivated warning lights in addition to the belt unfastened buzzer.
- to the Body Computer for potential end of line customisation (Proxy) with a consequent reduction in the number of spare parts.
GRAVE DANGER! The front air bag 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 AND NOT BY USING THE KEY.When it is deactivated the warning light in the instrument panel comes on. | If the vehicle is equipped with side bags, deactivation of the front passenger side air bag module also disables the side bag. |
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 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;
- four electronic pretensinoers on the front seat belts (two for each belt).
1. Electronic control unit;2. Driver''s knee bag3. Driver''s front air bag4. ECS early crash sensor5. Window Bag6. Passenger front air bag7. Pretensioners8. Side impact sensorThe following indicate the status of the system:
- system fault warning light (red) in the instrument panel:
- passenger side airbag disabled warning light (amber) on the instrument panel;
- front seat belt unfastened warning light on the instrument panel;
- connection via the B-CAN with the diagnostic socket - for function checks using an EXAMINER.
1. Air Bag failure warning light2. Passenger air bag warning light offElectronic control unit
The following diagram shows the control unit.1. Electronic control unit2. Indication showing direction of motionThe control unit is the central occupant protection processing unit and is fastened rigidly to the vehicle floor pan near the central tunnel. It manages all the containment system detection and activation devices by processing signals from the various sensors distributed throughout the vehicle and internal sensors. | 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. |
Composition
The control unit has an electronic deceleration sensor which, with the assistance of front and side satellite sensors and, via a dedicated calculation algorithm, manages the activation of the front and side modules and the pretensioners.Operation
Frontal impact:When the impact is of moderate severity, the electronic control unit controls the first air bag activation stage for the driver''s and passenger air bag so 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.Side impact:Similarly, when side impact occurs, the control unit is able to recognise direction and intensity and thus activate both air bags and the pretensioners 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 there is a side impact, the satellite sensors detect the deceleration due to the impact and notify the control unit which, by means of a dedicated calculation algorithm, manages the activation of the side modules and the pretensioners.The side Air Bags (Window Bags and Side Bags) 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 the 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| CONNECTOR A (dashboard wiring, BLUE) |
|---|
| Pin | Signal |
| 1 | Earth |
| 2 | +ignition power supply from F50 |
| 3 | N.C. |
| 4 | N.C. |
| 5 | N.C. |
| 6 | N.C. |
| 7 | B-CAN A line (low) |
| 8 | B-CAN B line (high) |
| 9 | N.C. |
| 10 | N.C. |
| 11 | Front impact sensor (-) |
| 12 | Front impact sensor (+) |
| 13 | Passenger Air Bag (-) |
| 14 | Passenger Air Bag (+) |
| 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 (-) |
| CONNECTOR B (rear wiring)version without side bags (BLACK connector). |
|---|
| Pin | Signal |
| 1 | N.C. |
| 2 | N.C. |
| 3 | N.C. |
| 4 | N.C. |
| 5 | N.C. |
| 6 | N.C. |
| 7 | N.C. |
| 8 | N.C. |
| 9 | Passenger sill end pretensioner (+) |
| 10 | Passenger sill end pretensioner (-) |
| 11 | Driver''s sill end pretensioner (-) |
| 12 | Driver''s sill end pretensioner (+) |
| 13 | Front passenger belt pretensioner (+) |
| 14 | Front passenger belt pretensioner (-) |
| 15 | Driver''s front belt pretensioner (-) |
| 16 | Driver''s front belt pretensioner (+) |
| 17 | N.C. |
| 18 | N.C. |
| 19 | N.C. |
| 20 | N.C. |
| 21 | N.C. |
| 22 | N.C. |
| 23 | N.C. |
| 24 | N.C. |
| 25 | N.C. |
| 26 | N.C. |
| 27 | N.C. |
| 28 | N.C. |
| 29 | N.C. |
| 30 | N.C. |
| 31 | N.C. |
| 32 | N.C. |
| CONNECTOR B (rear wiring)extensive version with side bags (GREY connector). |
|---|
| Pin | Signal |
| 1 | Passenger side head bag (+) |
| 2 | Passenger side head bag (-) |
| 3 | Driver side head bag (-) |
| 4 | Driver side head bag (+) |
| 5 | N.C. |
| 6 | N.C. |
| 7 | N.C. |
| 8 | N.C. |
| 9 | Passenger side bag (+) |
| 10 | Passenger side bag (-) |
| 11 | Driver''s side bag (-) |
| 12 | Driver''s side bag (+) |
| 13 | Front passenger belt pretensioner (+) |
| 14 | Front passenger belt pretensioner (-) |
| 15 | Driver''s front belt pretensioner (-) |
| 16 | Driver''s front belt pretensioner (+) |
| 17 | N.C. |
| 18 |
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