Has anyone been able to figure out how to get the HVAC functionality to work on a carputer LCD screen? I've searched around, but the best that I could find were posts like:
http://www.mp3car.com/vbulletin/showthread.php?t=29881
where people are looking to do this, but I have yet to see anywhere where someone has actually been able to do this. This would be really cool if we could do it because
1) A Xenarc screen looks WAY better than the non-navi screens
2) I wouldn't have to relocate the non-navi screens to where my ash/CD trays are and have to cut (as much) stuff
3) I'd still have the functionality of the ash/CD trays.

 

how about a way to connect only the HVAC display from a NAV TL along with the carputer.

 

man, I wish there was an easy way to do this...I was trying to figure out the same thing over a year ago. i believe you are referring to the upper display from the navi, where the non-navi just has a clock. The navi and non-navi have two different wiring harnesses behind the dash. Additionally, you'd need the navi brain to display the info for that screen up top...

 

Reproducing the "brain" as far as how to control it and everything woudln't be TOO bad since we have a whole CPU to crunch away at this. The hardest parts are figuring out:
1) The protocol that the current "brain" is using
2) The Electrical specs on the lines that you have to mess with.

We could probably figure out 1 with a little bit of effort, but #2 scares me a little bit more. Hate to accidently fry something trying to figure out #1. Hell, if anyone happened to have a logic analyizer laying around, we could easily mimic #1. What we really need is to know what kind of protocol it's speaking. If we figured that out, it would be much easier to come up with a solution.