Well, Debugging the Information Display yielded little results. There are issues with the original unit for sure, and maybe a little beyond my capabilities at the moment. But, a replacement part was available, and not too expensive, $225. It is worth it to have a legible display.
In the old display the is cracking on the touch screen where I press it frequently. The display itself is also kinda weirdly distorted. Then the backlight is another issue. At first I was thinking that the backlight was failing, but at the end the screen was mostly white, like the data wasn't getting to the screen, and the backlight was full on. The old display is out of Truk now, so I can troubleshoot it without having to take Truk apart.
Replacing the Media Display is relatively easy once you are acclimated to working on Toyota interiors. The place to start is learning where to pry up the trim. The head unit is held by four bolts, and there are like 14 connectors to remove. Toyotas are neat in this way, each of the connectors for the head unit are unique, and that makes getting them reconnected wrong nearly impossible, except for expert repair people like me. The operation was around 15 minutes, and now I can see things like the temperature outside, and the vent settings again, oh, and the 23 year old GPS Map... Whoo Hoo!
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