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Home >> BMW >> 2006 >> 330xi Automatic >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Multiple Restraint Systems >> E90 Multiple Restraint System 5 >> System Components >> Pyrotechnic Devices >> Side (Thorax) Airbag Modules
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Side (Thorax) Airbag Modules

The driver and passenger side (thorax) airbags are mounted to the front seat backrest frame and are designed to protect the front driver and front passenger during a side impact.

The modules are side specific (i.e. a right hand module must be fitted to a right hand seat and a left hand module must be fitted to a left hand seat). The side airbags are activated by a control signal from the MRS control unit in the event of a side impact or a front angled impact of sufficient severity to cause both front and side airbag deployment.

The side (thorax) airbag module is consists of a molded plastic case which houses a folded nylon fabric bag, the gas generating capsules and an igniter squib. The rear of the side airbag module features two studs that are used for mounting the module to the seat frame and are secured in position by two nylon lock nuts.

The side airbag modules have a 2-pin connector under the seat where it connects to the main harness.

Fig 1: Identifying Side Airbag Module
G03393807Courtesy of BMW OF NORTH AMERICA, INC.

Workshop Hint 

If a new side airbag module shows any sign of damage, DO NOT USE. 

Workshop Hint 

Do not try to remove the connector at the module end, it is a permanent connection.