Hi guys- I don't know if this has already been mentioned on here but-
I just went through hell installing an after market double din nav / dvd unit in my 04 av- I wanted to share the wire harness part #'s with anyone else going through the same issue splicing an aftermarket harness to the factory harness.
The correct part number for all 2000+ GM vehicles with on-star or bose systems that require a Class II Data Bus harness is NC-GM39B
The correct part number for all 2000+ GM vehicles without on-star or bose systems that still require a Class II Data Bus harness is NC-GM39C
From what I'm told- you'll need the class II data bus for any vehicle that chimes through the speaker system rather then the radio.
If this is a redundant post then feel free to delete it.
So where is the most cost effective place to buy this adapter. I do a google search and its like they want me to refinance my house to install an aftermarket stereo