3234810 - E7030 AIRBAG - Description (Head Bag)

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 Side Bags in the case of frontal and/or side impact of a certain severity.In the case of a side impact of a certain magnitude, the Side Bag and the corresponding Head Bag are activated (only on the side where the impact took place).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. This signal is also processed inside the control unit which, as a result, decides on the operation of the Side Bag and the Head Bag on the side where the impact has taken place.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 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 Bag is housed in the outer part of the front seat. The sensor is located in the centre pillar.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 Head Bag represents further protection for the occupants of the front seats because, in addition to the chest area which is already protected by the Side Bags, it also protects the head.It also offers the first protection for the occupants of the rear seats. The pretensioner is a device built into the front seat belt reel. For more details  see DESCRIPTION AND OPERATION: 5580C  air bag system

The control unit comes with a self-diagnostic function.

• 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 in the additional fuse box.

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