GF91.60-P-4037GZ Driver Airbag, Component Description

GF91.60-P-4037GZ Driver airbag, component description
- 164 up to Model Year 8

Component Identification:

The driver airbag with its squibs (driver airbag squib 1 (R12/13) and driver airbag squib 2 (R12/14)) is located in the steering wheel's impact absorber; it protects the driver in the event of a head-on collision.

The driver airbag is bolted to the steering wheel and upholstered on the side facing the driver. The upholstery is equipped with a predetermined fracture point to enable the airbag to deploy fully.

The electric connection of the squibs from the rotatable steering wheel to the restraint systems control unit is ensured by the steering column module (N80).

To avoid any malfunctions, the squibs are equipped with short circuit bridges. If the coupling is detached, the squib connections are short circuited.

The housing contains the gas generator, which is equipped with two acid-free solid fuel units and is connected to the airbag via a filter. For ignition, each solid-propellant charge is equipped with its own squib.

Function
The restraint systems control unit (N2/7) sends an electrical ignition pulse to either one or both of the squibs of the gas generator, depending on the severity of the impact. The type of crash involved determines whether the squibs are ignited simultaneously or in stages.

The squibs then ignite the solid propellant in the gas generator. As the solid fuel burns, it generates a gas that flows explosively under high pressure through a filter and into the interior of the air sack, i.e. the airbag.

The folded airbag on the gas generator then inflates, the pressure of the inflowing gas forcing open the steering wheel cover along a predetermined fracture point.

As gas enters the airbag, it pushes through the predeter mined fracture point and fills to maximum volume.

The airbag reaches its full volume within approximately 30 msec.

It begins to deflate immediately after attaining maximum volume. The gas escapes from the airbag through a filter and the airbag collapses.