184000374 - 5580C AIR BAG SYSTEM
Air Bag System
INTRODUCTION
The car is fitted with an electronically-controlled system which, in the case of a front-end or side crash of medium-high severity activates the safety devices.The front protection system includes dual (driver and passenger) , dual stage, front Air Bags, front seat belts with pretensioners and load limiters, with a decentralised supplementary sensor for detecting impacts and a manual passenger Air Bag disabling switch.The side protection system comprises two Window Bags, housed in the side members under the roof and two Side Bags in the front seats are available as optional extras.The front protection system uses the new activation logic known as the Smart 2 Air Bag which is capable of automatically adapting the activation parameters depending ont he seriousness of the impact.The driver and passenger front Air Bags are the dual activation stage type: when the impact is of medium severity, the electrnic control unit only operates the first activation stage for the Air Bags avoiding the intake of energy not needed for the protection of the occupant.Conversely, for very serious impacts, the control unit activates both stages in order to be able to absorb the increased kinetic energy of the occupant before the impact against the steering wheel or the dashboard.In addition, an additional ECS Early Crash Sensor located near the bonnet lock; assists the electronic control unit in anticipating the intervention of the Air Bags compared with a conventional system so that the activation stage is completed even before the occupant starts to move forwards towards the steering wheel or the dashboard. In addition, this sensor detects underbody impacts or stresses for which the activation of the Air Bags is not necessary because there is no risk to the occupants. | The components of the Air Bag system have been designed to work on a specific car. They therefore may NOT be tampered with, adapted or installed on other types of vehicles. |
 | The vehicle should be handed over to the customer with the passenger Air Bag deactivtion switch in the ON position and the warning light in the instrument panel off. |
| For safety reasons continuity checks on the wiring are NOT permitted. |
The Air Bag system components are connected electrically by dedicated wiring, integrated in the dashboard wiring loom for the front devices, and in the rear wiring loom for the side devices and the pretensioners.The control unit is connected to the system by means of two connectors, one for the front cable and one for the rear cable.The control unit is connected to the vehicle CAN through which it exchanges information with the other nodes, lights up the warning lights in the instrument panel and carries out the diagnostic operations.As the control unit is a CAN node, the Air Bag system has the following opportunities:
- connection to the diganostic socket via the CAN and no longer with the dedicated K line;
- connection to the instrument panel for operating the warning lights;
- connection to the panel to satisfy the EuroNCAP protocol which involves a series of warnings if the seat belts are not fastened.
- connection to the Body Computer for the possible end of line customization (Proxi) and consequent reduction in the number of Spares.
The passenger''s front Air Bag module can be deactivated voluntarily, by a specific key switch located beside the dashboard. | GRAVE DANGER! If a child seat is fitted on the front passenger seat, the front Air Bag module MUST be deactivated. |
| If the vehicle is equipped with Side Bags, the deactivation of the passenger front Air Bag module does not disable the side modules. Thus in the event of a side impact, protection is also offered to any child who may be on board. |
COMPOSITION
The system comprises the following devices:
- an electronic control unit;
- dual driver and passenger front Air Bags with dual stage activation
- an additional decentralized ECS impact detection sensor (Early Crash Sensor)
- a manual passenger Air Bag disabling switch,
- two Side Bags on the front seats,
- two Window Bag modules for protecting the sides of the occupants;
- two side impact sensors fitted in the side pillars;
- two electronic pretensioners on the front seat belts;
To indicate the state of efficiency, the system has:
- fault warning light (red) on the instrument panel;
- passenger Air Bag disabled warning light in the instrument panel;
- connection via the B-CAN with the diagnostic socket - incorporated in the Body Computer - for checking the operation using the EXAMINER.
1 - Electronic control unit2 - Passenger Air Bag disabling switch3 - Passenger''s Air Bag module4 - Passenger''s Side Bag module5 - Passenger seat belt pretensioner6 - Passenger side impact sensor7 - Passenger''s Window Bag module8 - Driver''s Window Bag module9 - Driver''s side impact sensor10 - Driver''s pretensioner11 - Driver''s Side Bag module12 - Driver''s Air Bag module13 - Front impact sensor14 - Air Bag system failure warning light15 - Passenger front Air Bag disabling warning lightElectronic control unit
The following figure shows the control unit.1 Electronic control unit2 Direction of travel indicationThe control unit represents the central processing unit of the occupant protection system and is fastened securely to the vehicle floor pan near the centre tunnel. It manages all the system detection and activation devices, processing the signals which come from the various sensors around the vehicle and from those fitted inside. | The control unit must always be fitted with the arrow 2 stamped on the adhesive plate facing the vehicle''s direction of travel. Always check that there are no foreign bodies between the control unit and the bodyshell, tightening the bolts to the recommended torque. |
Composition
The control unit contains an electronic deceleration sensor which gives the go ahead for the activation of the safety devices. This sensor comprises two direction accelerometers which include the front ECS and power the operation of the side sensors. | If the control unit is dropped or is subjected to unusual impact during handling, the control unit MUST be replaced. |
Operation
Frontal crashWhen the severity of the impact is medium, the electronic control unit only commands the first activation stage for the Air Bags preventing the intake of energy not needed for the protection of the occupant.Conversely, for very serious impacts, the control unit activates both stages in order to be able to absorb the increased kinetic energy of the occupant before the impact against the steering wheel or the dashboard.In addition, the E.C.S. assists the electronic control unit to anticipate the intervention of the Air Bags compared with a conventional system so that the activation of the Air Bags is completed before the occupant even starts moving forwards towards the steering wheel or the dashboard.Side impactSimilarly, when there is a side impact, the control unit is capable of recognizing the direction and the intensity, activating the two Air Bags fitted on the side affected by the impact. In order to provide complete cover for side impacts, there are two satellite sensors located in the centre pillars.When a side impact occurs, the satellite sensors detect the direct crash signal along the car''s transversal axis, and send it to the control unit. This signal, processed by a microprocessor inside the control unit, detects the severity of the side impact and decides whether to set off the side Air Bag on the side concerned only if the safety sensor is enabled by the control unit.The Side Bags (and head bags if fitted) are activated simultaneously and independently of the front safety devices.After each activation of one of the systems operated (pretensioners, front Air Bags, side Air Bags), the control unit memorises the activation in non-deletable memory and causes the fault warning light on the instrument panel to come on.Before being replaced, the control unit guarantees the activation of the individual devices within the following limits:
- 3 impacts with activation of the front seat belt pretensioners only;
- 3 impacts in total (left and right) with the activation of the side Air Bags;
- 1 impact with activation of the pretensioners and front Air Bags;
- any combination of the above cases until one of the limits indicated is reached.
If one of the limits described has not been reached, it will be possible, after restoring the operating conditions of the system, to reuse the control unit after carrying out the RESET procedure by means of the EXAMINER. The last activation, corresponding to the maximum number, will prevent further reset conditions.Control unit pin out
The diagram below shows the control unit and Pin Out1 - Electronic control unitA - FRONT CONNECTOR (black coloured dashboard wiring)B - REAR CONNECTOR (light blue coloured rear wiring)FRONT CONNECTOR| PIN | OPERATION |
|---|
| 1 | EARTH |
| 2 | CONTROL UNIT SUPPLY CONTROLLED BY IGNITION |
| 3 | N.C. |
| 4 | N.C. |
| 5 | N.C. |
| 6 | N.C. |
| 7 | B.CAN-A LINE |
| 8 | B.CAN-A LINE |
| 9 | PASSENGER BAG DEACTIVATOR |
| 10 | N.C. |
| 11. | N.C. |
| 12. | FRONT IMPACT SENSOR ECS |
| 13 | PASSENGER AIR BAG 1ST STAGE (+) |
| 14 | PASSENGER AIR BAG 1ST STAGE (-) |
| 15 | DRIVER''S AIR BAG 1ST STAGE (-) |
| 16 | DRIVER''S AIR BAG 1ST STAGE (+) |
| 17 | DRIVER''S AIR BAG 2ND STAGE (+) |
| 18 | DRIVER''S AIR BAG 2ND STAGE (-) |
| 19 | PASSENGER AIR BAG 2ND STAGE (-) |
| 20 | PASSENGER AIR BAG 2ND STAGE (+) |
| 21 | N.C. |
| 22 | N.C. |
| 23 | N.C. |
| 24 | N.C. |
REAR CONNECTOR| PIN | OPERATION |
|---|
| 1 | PASSENGER SIDE IMPACT SENSOR |
| 2 | DRIVER SIDE IMPACT SENSOR |
| 3 | N.C, |
| 4 | N.C, |
| 5 | N.C, |
| 6 | N.C, |
| 7 | N.C, |
| 8 | N.C, |
| 9 | N.C, |
| 10 | DRIVER''S SEAT BELT NOT FASTENED SWITCH |
| 11. | N.C, |
| 12. | N.C, |
| 13 | PASSENGER WINDOW BAG (+) |
| 14 | PASSENGER WINDOW BAG (-) |
| 15 | DRIVER''S WINDOW BAG (-) |
| 16 | DRIVER''S WINDOW BAG (+) |
| 17 | PASSENGER SIDE BAG (+) |
| 18 | PASSENGER SIDE BAG (-) |
| 19 | DRIVER''S SIDE BAG (-) |
| 20 | DRIVER''S SIDE BAG (+) |
| 21 | FRONT PRETENSIONER PASSENGER (+) |
| 22 | FRONT PRETENSIONER PASSENGER (.) |
| 23 | FRONT PRETENSIONER DRIVER (-) |
| 24 | FRONT PRETENSIONER DRIVER (+) |
Self-diagnosis
The control unit carries out a continuous autodiagnosis of the system operation. In particular:
- it detects and memorizes any faults
- diagnoses the connections with the system components and the possible type of fault;
- it signals the onset of these faults via the special warning light in the instrument panel.
The faults memorised in the control unit may only be del| ... DATA ERROR - CROPPED TEXT | Ошибка данных - Текст обрезан ... |
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