I don't want to be a spoilsport, but either:
1. You have the authorization to tinker with these systems: Then you should be able to answer these questions with ease. If not, you need to go back for further training immediately!
or
2. You are not authorized to tamper with such systems: In that case, you don't even need to know about them, because you wouldn't be able to do anything with that knowledge anyway.
Please don't misunderstand, but an airbag is definitely not a toy!
Therefore, I don't think it would be particularly helpful to provide specific data here. A talented amateur mechanic might think, "Now I have the information of an expert and can fix this myself," and then the whole thing could go horribly wrong.
Something like that doesn't have to happen, so I'm ending this here. Please don't take it personally; it's just for the protection of life and limb.

MfG. Michael
VW Golf IV TDI GTI 4-Motion Bj.2002 MKB/GKB: ARL/FEK
VW T4 Pritsche TDI Bj.1999 MKB/GKB: AXG/AFK (Selfmade)