Nav/XM/CD help

[LasVegas]

I'm doing the TNR Nav/XM and CD changer under the rear seat upgrade. Everythings gone fine so far except the cd harness is really complicated and NO instructions. I've installed the XM tuner, mounted the CD and routed all the cables. Now, the CD cable has multiple connectors and it appears I connect their 24 female pin connector to the factory 24 male connector and the same with the other connector. Then when I match up the other logical connectors with the XM cable it looks right (leaves me with the appropriate connectors to plug in rear of the NAV. Except I end up with one extra connector but it looks like just a duplucate off the other connection (maybe for a 2nd unit????). Also, I guess I still have to change the two wires in the connector 24 pin connector for the XM but in the factory connector or the new interfaced 24 pin connector with the CD or does it matter??? I'm going to call support first thing in the morning but with the holiday who knows if they're open. Any help would be appreciated. Changer is a SCD-G7i

Here's a pic if it helps