Great write-up, Mitch!
In the last few weeks, two Liberty owners have contacted me wanting to do this mod, hoping I could provide some of the missing harnesses. One of them sent me your PDF, and I finally tracked down where it had been posted so i could contact you (there doesn't seem to be any contact info in the doc itself). I wanted to send you some comments, corrections, and answers to questions you raise.
Unfortunately, I don't have the housings or terminals to build most of the harnesses needed by the nav system. However, there may be one or two that I do. I need to take a closer look at the connectors on the nav unit and screen, and then check parts that I've collected.
In the mean time, here's some other information that should be helpful:
"CN100" is Kenwood's internal name for that 10-pin socket on the back of the DVD unit (as designated in their service manuals). Subaru designates that harness "R226" in US models (possibly the same number in other markets).
That plug is one that Kenwood has used on other of their aftermarket navigation units from around that vintage (~2006), including the KNA-DV2100, KNA-DV3100, KNA-DV3200, and KNA-DV4100. So you might have better luck ordering that as a replacement part from a Kenwood parts source. I'm fairly sure it's this one:
http://store.kenwoodusa.com/catalog.php?id=59 (I haven't confirmed, and Kenwood's picture isn't very helpful).
Harnesses like that sometimes turn up on eBay, too.
One thing Mitch mentions in his guide is putting together a 14-pin forward/reverse harness, to tap several of the power leads from the radio harness. For cars without the McIntosh system, a problem with the Metra 70-8901 and similar harnesses is that nobody includes the dimmer/illumination(-) wire (pin #7). I'm the only source making those harnesses that include that wire.
Link.
I also build combined forward/reverse harnesses, along the lines of
this. That can save a bit of time and effort. For more information, please contact me via e-mail (follow link from the above page, or my homepage
http://ae64.com )
I had several other comments/feedback about the PDF, but I'll need to look over that again and then send them directly to Mitch.
Cheers