You have to do some programming to make the newer units work in an older car the details of which I am not to sure . The one above has USB and I think all the ones after 09 have HD Radio . But installing them in an older car is not a clear process.
Some of the units on Ebay don't have a Most Bus connection which you need in a older US car.
There is something in here about having to change the production
date of the car to install,because of software issues, then changing it back.
You can't do A2DP music streaming without the combo box to my
I think I would try to get it working on your original path .
Have you tried reading your rad settings with the cable?
If you have made a copy of the cars programming then i would
search for pdc in that file. I not sure if pdc has its own module.
Also if you do a Vin readout what options show up as being there?
Compare it to the option list on the coding board.