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AJS800, Thanks for all of your help. I will continue looking to see what harness I need for the bose amp.

Thanks for the clarification. I currently have Onstar and XM in my vehicle. Do I still need to wire them or should they be already in the black harness? When you installed your nav unit, did you have a bose or a non bose system? The reason I ask is I have a non bose system but purchased the...

No but I bought one that I want to install.

But on my current radio there are only two connectors - black & purple. So one of the ones that are left are for the Onstar?

What are both harnesses for? I know one is for VSS what about the other one?

I would like to add a OEM Nav unit to my 08 Non-Bose Tahoe but I am not certain exactly what to do. I have already purchased the GM Nav Unit part # 15940102, the Bose Amp and the Rear DVD Receiver. I am not certain I really need the Rear DVD but it came as a package. I have been reading forum...