Front airbags help protect the driver and front passenger by responding to frontal impacts in which safety belts alone would not provide adequate restraint.
Side airbags
In a lateral impact, the side airbag supports the side of the body in the chest and lap area.
Head airbags
In a lateral impact, the head airbag supports the head.
Knee airbag
The knee airbag supports the legs in a frontal impact.
BMW X3 Service & Repair Manual > Body repair instructions: Safety at work
Note national regulations.
1.0 Compressed air:
Air guns must not be pointed at individuals. "Blowing off" the body with compressed air may lead
to serious injury.
The devices are not permitted to be cleaned with compressed air due to dust contamination.
2.0 Electrical systems/devic ...