some initial info as to why you want to know where things are will help us understand what the problem is you are having.
as for the SRS system, i dont know where they live and its best left to people who know what they are doing, because if anything goes wrong it could cost someones life. iv worked on Jaguars for near enough 11 years and have carried out many repairs on the SRS system BUT if we sell a non franchise car and it had the airbag light on, we send it to the dealer to get sorted.