No. I have the 6 CD unit with the AUX button.
After plugging in the existing satellite harness at the rear of the car, I can access Sat 1, Sat 2 and Sat 3 by pressing the AUX button on the head unit. Channel names and song titles display correctly. The only problem I'm having is that I have no satellite audio. Sirius says I should be able to hear audio on channel 184 before activating the unit.