Pin 7 does not work with the home-made readers (I also tried it when I made my reader).
I would guess that it is the data link for Volvo's proprietary diagnostics (VCT2000).
You will probably have to go to a Volvo dealer for SRS diagnostics.
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Gavin
1997 945 CD (B230FK) [RIP: 1991 945 Turbo (B230FT) 1992 945 SE turbo (B200FT)]
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