My experience with the RB1, iPod, and Sirius has been successful, but I think there are two solutions, one easier than the other. Based on the information I found on wjjeeps.com, I connected the Sirius to the Multiplexer (PN 5066202AC) and then used the Artist cable (PN 82208322) from the Multiplexer to the RB1. This made the Song and Title show up on the RB1.
I then disconnected the Artist cable 10 pin connector from the RB1 and connected it to the iPod adapter 10 pin input. I also connected the iPod to the RB1 with the cable provided with the iPod kit. This is per the iPod adapter instructions.
After doing this, the RB1 still showed the Artist and Song information for the Sirius. Now it also shows the Artist and Title for the iPod.
To switch, the pattern is to keep toggling the CD/AUX button on the RB1. The behavior I am seeing is that the Source switches from CD -> Sirius -> CD -> iPod and then repeats the cycle. I would have liked not going back to CD in between the Sirius and the iPod, but it is a minor annoyance.
What I found out recently was that the Artist cable actually has one more pin than the car's standard wiring harness. That was pin 8 of the 10 pin connector. My car harness is empty in pin 8, and the Artist cable did have pin 8. That is the only difference.
So I think the whole Mux & Artist Cable was just one way to get pin 8 populated.
My question then is:
Does the Sirius to RB1 (long 12 pin to 10 pin) connector PN 5066203AA have pin 8 populated? (This is the cable included with the standard Sirius installation kit II (No CD Changer) PN 82206489)
If the 12 to 10 pin cable does have pin 8 populated, then this is a simpler solution (no Multiplexer and Artist cable), and I think this is what GeoBigJon discovered.
Does anybody have one of these long 12 to 10 pin cables that can see if pin 8 of the 10 pin connector side is populated?