3361146 - E7030 AIRBAG - Description

Description

The car may be fitted with an electronically-controlled safety system that sets off the front seat belt pretensioners and the driver's air bag, passenger air bag and sidebags in the case of frontal and/or side impact of a certain severity.An electronic control unit manages the entire system by controlling all the components and activating the restraint systems (pretensioners and airbags) as necessary. The control unit is located under the centre console and is rigidly fixed to the bodyshell: in this way the deceleration sensors located inside it are close to the centre of gravity and detect deceleration for the entire vehicle accurately. There is an accelerometric sensor on the two front door pillars which, in the case of a side impact, transmits a signal to the control unit. The early crash sensor which detects slight bumps is located at the front on the radiator crossmember.A special occupant classification sensor detects the weight and dimensions of the occupant in the front passenger seat.When a frontal impact of a certain severity (depending on the control strategy from the above two sensors) is detected, the control unit sends control signals for stage 1 operation of the front modules and the front and rear pretensioners.When frontal impact of a certain severity is detected, the control unit sends control signals to set off the stage 2 front modules:In the case of a side impact of a certain severity, the front and rear Side Bags and the Head Bag are activated (only on the side of the car where the impact takes place).

The front passenger module is activated for stage 1 operation if the seat sensor signals a light and/or small occupant.

The two front Air Bag modules have two stage operation: the first stage is for slight impacts and the second stage for more severe impacts.The two stages have two separate charges which 'fill' the bag 60% (first stage) and 40% (second stage).The driver's Air Bag module is located at the centre of the steering wheel; it is fitted on a tilting plate which enables the horn to be operated. The plate houses a metal container which holds the folded air bag and a gas generator that inflates the bag. A clock spring device allows the air bag module connection leads to turn with the steering wheel without the risk of breakage. The passenger airbag is located on the facia, above the glove compartment, and is fastened directly to the car crossmember via a special bracket. The passenger Air Bag can be manually deactivated via a special switch - which can be operated by a key - located at the end of the dashboard, passenger side and is only accessible with the door open.With the key in the OFF position, the control unit also controls the operation of the special 'passenger Air Bag disabled' warning light.The Side Bags are housed in the outside of the front and rear seats.The rear Side Bags can be deactivated manually via a special switch that can be operated via the key: it is located in the luggage compartment, on the right hand side.With the key in the OFF position, the control unit also controls the operation of the special 'rear passenger Air Bags disabled' warning light.The Head Bag consists of a curtain bag which inflates and places itself between the head of the occupants and the side windows. The Head Bag folded bag is located under the roof panel, whilst the rear pillar houses the gas generator. The pretensioner is a device built into the front and rear seat belt reels.The control unit is also prepared for sending an emergency signal warning that there has been an impact to the radio-telephone-navigator incorporated in the CONNECT that sends alarm messages. For more details Characteristic of working principle 5580C air bag system .

The control unit is self-diagnostic:

• it detects and memorizes any faults
• it recognizes the various components and the type of fault
• it signals the onset of these faults via the special warning light

System activations following a particularly serious impact are memorized by the control unit. The system control unit supply line is protected by a fuse located in the junction unit. When the system self-diagnostic function detects a fault or an impact is detected the control unit sends a signal via the CAN for the Air Bag failure warning light located in instrument panel.Similarly, the passenger Air Bag disabled warning light and the seat belts not fastened warning light are lit up.: this warning light signals that the front seat belts are not fastened.

The warning light comes on constantly:

• at the key on (ignition ON), if the seat belt has not been fastened previously;
• if the seat belt has been unfastened whilst driving;
• when the seat belt is fastened, the warning light goes out.

The warning light starts to flash and, at the same time, the instrument panel buzzer sounds intermittently for 90 seconds if, with the ignition ON:

• the speed of the vehicle exceeds 10 km/h after 60 seconds;
• the speed of the vehicle exceeds 25 km/h;
• the distance travelled exceeds 500 m;
• when the seat belt is fastened, the warning light goes out and the buzzer stops.

At the end of the 90 seconds, the buzzer stops and the warning light remains on constantly.

The warning mode with the warning light flashing and the acoustic signal can be deactivated either temporarily or permanently  Characteristic of working principle 5560  INSTRUMENT PANEL :

There are four possible configurations for the system: the 'standard' configuration., supplied as standard, includes front passenger air bags (with key-operated disablement device) and front seat pretensioners; an intermediate configuration, with front passenger air bags, front seat pretensioners and also front seat side bags; a more comprehensive configuration with front passenger air bags, front belt pretensioners and front seat side bags; and also head bags; an even more comprehensive configuration with front passenger air bags, front and rear belt pretensioners, front and rear seat side bags (the latter with key-operated disablement devices) and also head bags.; this is the only configuration equipped with a passenger seat occupied sensor.

When operations are carried out to the Air Bag system the recommended safety instructions must be followed precisely.

For more details Characteristic of working principle 5580C air bag system .