The gas generator is a pyrotechnic component of:
Airbag module
Driver's/passenger airbag
Side airbags
Head airbag
Knee airbag
Belt pretensioner
Belt buckle tensioner
Safety battery terminal
1 Series: E81, E87
3 Series: E46, E90, E91, E92, E93
5 Series: E60, E61 from build date 09/2