2428127 - 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 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 severity, the Side Bags and the Head Bag are activated (only on the side of the car where the impact takes 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.The early crash sensor which detects slight bumps is located at the front on the radiator crossmember.When a slight frontal impact is detected, the control unit sends control signals for stage 1 operation of the front modules and the 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 Side Bags and the Head Bag are activated (only on the side of the car where the impact takes place).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 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 Bags are housed in the outer part of the front seats.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 seat belt reel.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
 | carefully observe the safety regulations when working on the airbag system. For more details [PR5580C] |