OKAY, Question. Avic D2.... I already have the GEX-P10XMT XM Tuner for my XM and navtraffic. Thats using my IP-BUS and my data cable. Now I havent looked but I beleive I still have an empty plug on the back of my headunit, should be the AV-BUS right ?

Now if I get the GEX-P6400TV Tv tuner can I mount that under my seat with the XM tuner and control it with the Headunit touchscreen ?

Can I have both the TV and the navtraffic ?

I looked at the manual, it looks like, the AV-BUS goes from tvtuner to headunit, and than my IP-BUS goes to the XM tuner....

SO the IP is for control ? So basically I hook the TV tuner to the XM tuner and the headunit can control both ? I'd like to not have to do anything but hit source, and click TV, it will do this right ? Thanks

You can have both. You daisy chain the P-bus for both of them (out of one->into the other.) Only the TV tuner has A/V bus so obviously hook that one up too