http://www.atthetipwebs.com/technologyinstructions/volvo_stereo_mod.htm
I'm unsure if this is one of those connect a device line or portable headphone out to the magnetic tape head wires. I'd hope what you splice in is line-level at least, if olskool line level.

Image from i-Pod to SC-816 connect kit:
http://www.discountcarstereo.com/VOL-MLINK1V.1.html
And:
https://www.amazon.com/Music-Integration-Volvo-Sc801-Huahee/dp/B00IZT36VS
Else, this is Alpine M-bus? So if you can find the specific pin out, maybe you can merely build a patch cord. yet the CD controlling logic in the SC-816
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