[MTCD Android Head Units General] kind3r:
Wow, nice find. I was actually looking for that before buying a unit but could not find any schematics.

The back pannel arrangement of the connectors is not similar to my original unit see a picture of the back of mine here, but connectors seem to be more or less the same. Now, not all the connectors on the car have a corespondend on the harness and viceversa. The connector you are reffering to must be the Sirius XM receiver (? satelite radio) which as far as I know is not available in EU. Also, the USB connectors look the same in your document but in my case they are a bit different by just a small notch. What is the functionality you are interested in so I can tell you if it works for me or not.

On a side note, I have tested the unit during the last few days using the auto sleep feature, witch does not do a shutdown + cold boot so the unit starts in 1-2 seconds after you start the car. There is still a small delay after that when you get notifications about the SD card and USB stick that are being mounted so that's another 2-3 seconds until playback resumes, so it's still faster than the cold boot which takes around 25 seconds. But as android tends to be like windows on the long term, I will stick with the cold boot 'mode'.

As [MENTION=9520323]HNDXCRV[/MENTION] and others mentioned, I could not find a way to set the clock on the factory display. But as DST changed in my country, with a big bang I might add (earthquake during the night, could not sleep after that :/) to my surprise the car's clock changed as well. So I guess there is some communication from the HU, at least for time. My guess is playing in Factory Settings could result in AC being controlled from the unit as well. But I don't really see the point in doing that since dedicated hardware buttons are better than touching a display.

Some were concerned about the performance of the display in direct sunlight. Today was a sunny day, I took a trip to the seaside and I can tell you I had no issues looking at the display with my polarised sunglases on. Also the angle of the polarisation did not seem to matter as tilting my head did not do anything to the brightness level or colors, so kudos for that, it's a really nice display. At some point I was looking through the settings and realized it was only at 75% brightness.

Overall I really love this unit. Of course it's not perfect and there is some room for improvement here and there, but there are no words to describe the difference of (first and foremost for me) performance, sound quality, level of customization, size and quality of the display. Most of the small things that bother me are due to software ergonomics say like the radio app having a dedicated button for stereo lock, instead of something more useful (not that anything comes to mind right now). You have to customize a bit to your liking, I have uninstalled/disabled apps that cycle via the source button on the steering wheel, changed the volumes of navigation, radio, music, a2dp etc. to my personal preference. Also there are a ton of replacement apps for the stock ones, play store is full of choices if you have enough time to try them out, like launchers, dialers, music apps etc.

I still have to update to the latest Android version (unit came with 20180809, latest is 20181011, but with newer MCU 2.98_1) but since there is no reason to, I will hold off for the moment. I am tempted to do a full reset of the unit as there are some leftovers from the seller testing the unit like paierd phones etc. (not that it matters too much).