3310037 - E7030 AIRBAG - Description

Description

The car is fitted with an electronically-controlled safety system that sets off the front seat belt pretensioners in the case of frontal and/or side impact of a certain severity together with the driver and passenger airbags.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 has two different intervention levels:

• at the first level only the pretensioners are activated
• the second level operates both airbags and pretensioners.

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.The driver's Air Bag module is located in 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 airbag and a gas generator that inflates the bag.A clock spring device allows the airbag 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 airbag may be deactivated manually via a special switch or automatically by a sensor in the seat.The switch, which is ignition-activated, is located at the end of the facia on the passenger side and is accessible only with the door open. When the key is turned to OFF, the control unit also controls the activation of a passenger air bag disablement warning light on the instrument panel.The seat houses an automatic passenger presence detection sensor. This takes the form of electrical resistances that detect the presence or absence of a passenger.The pretensioner is a device built into the front seat belt reel.It cuts in to take up the inevitable lengthening of the seat belt due to the action of the body in order to hold the body against the seat squab.

The control unit is self-diagnostic:

• it detects and memorizes any faults
• it recognizes the various components and the type of fault
• to indicate the presence of faults via a warning light

System activations following a particularly serious impact are memorized by the control unit. For more details  see DESCRIPTION AND OPERATION: 5580C  air bag system . The system control unit supply line is protected by a fuse located in the junction unit.

carefully observe the safety regulations when working on the airbag system. For more details  See assembly 5580C   air bag system