I just called Pacific Parts and they are researching it for me. I will have an answer in two to three days on if they can get a service manual for me. If I get one I will post the pin out for the din connector here. I really don't want to buy a new head unit if I don't have to. I'm trying to keep this project as cheap as possible.
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"The trouble ain't that there is too many fools, but that the lightning ain't distributed right."
Mark Twain