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By using the PIE adapter (and maybe the brand you have referenced as well) I just hit the CD button and it toggles between CD-1 and CD-2 (if no CD's in the head unit), then it defaults to the my external SAT radio I have hardwired into my head unit.
The head unit sees the adapter as a remote or secondary CD player??? However, not all model years and radios work this way - not sure why (my head unit does NOT have a AUX button by the way).
Guess you could buy it and try - as long as you can return if it does not work?