I am still using the factory headunit. I pulled the XM box behind the glove compartment, and put my Sirius box there. (This may be my problem, maybe I should have left this in place??)
I then attached the antenna to the Sirius box. I used the cable that came with the sirius box to attach to the Soundgate adapter. I then attached the Soundgate adapter to the headunit with the Soundgate harness. I had to remove a cable from the headunit to plug the Soundgate harness in. I attached the Soundgate power connections.
That leaves 2 loose cables. The first is one I removed from the back of the headunit to plug the Soundgate harness in. The second is an extra that was on the Soundgate harness.
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