Sorry, I misread your original post. I have basically the same kenwood unit (906 instead of 706). Only problem I had with 2nd row was trying to use a cheap 1/8" to RCA component cable between receiver and the aftermarket harness. Came to find out the kenwood pinout on the 1/8" jack is not the...
Read through your post again, and just wanting to clarify that you got the 2nd row screen working, but not the 3rd. If 2nd row not working, you have other install issues or issues with settings on the Kenwood head unit.
Here is a link to the tech bulletin from alpine showing pictures of the...
I just put a Kenwood DMX906s in my 13 Yukon Denali XL and had the same issue. I used the idatalink maestro rr, so I called their tech support and was informed that the 2nd row and 3rd row monitors are run on different pins on the factory harness. I had to find pins 8 and 18 on the back side of...
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