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Success!
It was much simpler than I thought. As it turns out, the first z4 screen I acquired was defective. I had grabbed another one off ebay for very little $$ with the intention of integrating it into my old 320i. The first one I was working with had an issue with the gearing mechanism - I could hear it spinning when the wake up message was sent, but the screen would not move on its own due to a missing/broken piece. This is an issue because the CID "knows" it's current angle or position and will not turn on the video when it's below a certain angle. There may be a way to fool the sensor, but I haven't figured it out.
After receiving the second screen today, I had it up and running in 10 minutes. I still have plenty to figure out, but it's workable as it stands right now. All that needs to be done is to send the bus wake up packet - 80 xx bf 11 01 xx and the screen will pop open and the buttons for viewing angle and open/close will start responding when pressed. Next send the following packet - 3b xx f0 4f 11 11 xx - and the video will turn on. Send the following to turn the video off - 3b xx f0 4f 01 01 xx (the screen will stay in the open position). Next up, to keep the screen responding, it needs a ping from the nav around every 18-20 seconds. The count resets everytime it's sent so every 10 seconds is probably the way to go. Here's the packet - 3b xx 46 01 xx. There may be others on the normal z4 ibus that keep the screen alive as well, but that one works fine. If it doesn't receive the keep alive packet, the screen will turn off and close until it receives the wake-up packet again. The screen internally "remembers" its last angle position and returns to it automatically when opened again.
Still a couple of things to sort out, but it's coming along.
davipt - if you still have a chance to capture some full logs from your X3 and send them, I'd appreciate it.
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