Concerning the RBP and Sirius radios.
I just found on a Jeep site that the Sirius needs an extra module called a RB1 to enable the CD player to show artist and title. It is Part# 82208322 Sirius Satellite Radio/RB1 Audio System Adapter $30.00US $30.25US
RB1 adapter for Sirius and RBP
I'm not sure if the RB1 navigation radio is the one in the Pac or not. This is for the 2000-2004 Jeeps.
I have the 2006 PAC and the Sirius does not show anything. Neither does any regular CD or MP3 (see above posts)