Drwillis Chasing one of the cables that plugs from stereos to the rear disc changer in p80 (850/v70/s70).Cable can be cut as I mainly need the female and male sockets with a bit of cable on each end (splicing in a switch) .
Drwillis Even though alpine made most the premium Volvo stereo stuff for that gen they appear to be different. I believe the alpine mbus ones are similar (also 8 pin) but they are different sockets and slightly different wiring. Could be wrong (haven't seen alpine ones in person)
pauljloz I recall searching for head unit pinouts and making one from scratch. Too long ago to recall the specific details though.