Controlling movement of a seat in a vehicle

A method for use in controlling a seat back movement assembly in a vehicle having a vehicle control system, comprising:

• providing a control assembly responsive to the vehicle control system and operatively connected to the seat back movement assembly, said control assembly including a housing having a chamber, a piston head having first and second opposing sides, damping fluid and at least a first initiator assembly having an initiator charge;
• providing a first check valve, a second check valve, and a reservoir, said chamber having a first chamber portion on said first side of said piston head and a second chamber portion on said second side of said piston head, said first check valve being able to pass damping fluid from said first chamber portion but not from said second chamber portion to said reservoir and said second check valve being able to pass damping fluid from said second chamber portion but not from said first chamber portion to said reservoir;
• determining using the vehicle control system that a vehicle collision has occurred and said initiator charge of said first initiator assembly is to remain unignited;
• and
• regulating movement of the seat back movement assembly using said control assembly, wherein a first degree of damping to the seat back movement assembly is provided;
• wherein if said initiator charge of said at least said first initiator assembly is ignited, a second degree of damping to the seat back movement assembly is provided.