I'm going to share with you guys my last experiment regarding HD radio, though only Canadians might be interested. Both my cars Explorer and Focus built in 2011, Focus has HD radio from the factory, Explorer hasn't.
What I did was pretty simple - I swapped ACM units, it took me about 30 mins max. What I found is that Focus's ACM unit has HD radio logo on its case and Explorer's ACM doesn't have any HD logo (which is pretty understandable).
I plugged Focus's ACM into Explorer and realized that HD radio is working even without any modifications made to APIM, the only thing I'm missing is HD logo on both main and entertainment screen. I can switch between digital channels, but cannot see any HD logo on touch screen. And there is no TAG button as well, which is not that of big deal.
Moreover, since both IPC screens have different firmware than APIM I have HD logo on my right IPC screen when in entertainment mode.
to forum administrators: if it is wrong thread to post this, please move or we could create separate thread for that...