You can use THIS link as a guide. I did this with a 6 CD changer. You just need to determine which wires are the audio inputs from the slave to the radio.
Do some Goggle searches, there are lots of threads about Nav upgrades. From what I have read, the 07-12 Nav units are not compatible with the computer in an 05. I just upgraded my Head Unit to the Nav. The part number that I found would match my system was 15800000. Keep an eye on e-bay and...
Between these 2 threads, you and your installer should have no trouble.
http://www.tahoeyukonforum.com/forum/showthread.php?t=40897
http://www.chevyavalanchefanclub.com/cafcna/index.php/topic,93646.0.html
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