Like I said, you are in the wrong place.
I have never seen the item mentioned on this forum, and I have been here a while and looked at LOTS of threads.
Any info you get from here will be based on

searches that you should have, if not already, done.
This site is not for OEM navigation units, nor the modification of such units. While for a minute you piquesd my interest in making the unit into a carputer, I find it hard to believe you actually plan to do that because you asked about using the unit with out the can bus. That should not matter if you are making the unit into a carputer. First, a carputer will work independent of the CAN bus, and if you will be modding the unit to work as a carputer, the unit won't care if the CAN is present.
Then, to top it off, when I ask about your plans, you are like, "I have a good plan, trust me"
Yeap, such a good plan that before you bought the unit, you did research to figure out what the unit needed to work, and what was involved in modding it. If you truly were doing something to mod the unit, I think you would have been more forthcoming about your super duper plans.
At this point, I really think that you have this thing and you have no idea what to do with it, or how, if at all, it will work.
Like I suggested, head over to the Volvo boards, as that is your best place to find information for your "CARPUTER" mod.
Michael