And, I'm reopening this thread. The salvage radio is fully functional in terms of providing a sound system, but when I went for a night drive, I found that none of the backlighting is working except the LCD display. A little googling later, and apparently, this is what happens when the radio is not properly communicating with the car's computer.

This thread:
https://www.volvoforums.org.uk/showthread.php?t=123749

After reading through the thread, I tried the steering wheel controls, and they are non-functional as expected.

So, I'll be looking into a trip to a dealer for software resetting/reloading or maybe I'll get a VIDA/DICE system myself soon and see if it can be done DIY. I'll get back when I have more to share about trying to marry the "new" radio to the car. May be a couple of months before I get around to it.

Brett