Here is the raw Arduino development code. It is fairly well commented, although I can't guarantee being able to help with queries because it was such a long time ago. You will need to rename the file to have a .ino extension to make it work with a Uno.
All will make sense once you put a logic analyser onto the ribbon between the front panel and the control board inside the ZAB, and can see the control matrix being polled and pulled down.

Also, attached is the schematic and the foil pattern for the Uno Shield. You will need to remove the .bin file extension so that one ends .sch, and the other .kicad_pcb by removing my word "_dot_"

Edited: attachments now removed.

 

That was a huge work thank you and all other people working on it) ill modify it a bit, switch to android only with map button. And one more thing, sound from android device will go in av input in tv tuner or what? And what device with gps you can recomand? as media player and for streaming google cast and airplay i uses x96 max plus 4/32 in was not too much but y had you tube and thats it, but for navi it was not ok, only mirrioing. device has no own gps and i used ethernet connection with 4g modem.
oh and you know what i thought? to put trere just another headunit like kenwood, alpine or so ) with carplay ) and then iill have new headunit with all it functionality on sensor screen on map button, and native bentley interface for classic functions

 

If you only want to detect the map button being pressed, then that's simple, and you should be able to identify from the code which row and column combination is triggered, but of course you will still have to detect and ignore all the other row/column combinations being pressed.

From memory I think that my audio from the Minix is wired through the Grom BT.

For GPS/GLONASS I use a Garmin GLO connected to a USB port on the Minix.

As has been observed above, the Minix is a bit out of date now, and I can understand the idea to maybe use another head unit, but that is quite a complex integration task and I doubt that the manufacturer will help.

 

Yours setup is cool but to complicated for me) my top ability is to convert lights in Bentley from old style to new ))) and variant with another ehadunit is easyer a lot, actualy no need of manufacture help just to fing head that has videoout to its display that is supported by ours input on screen i gonna use as main.) In another word, that head unit shoould work as bently and two of tham will have one screen and arduino module will be a switcher ) When i was talking abou audio the question was how to send audio signall from secondary device (not zab) to bentley amplifyer? and i supposed that i can use av input in tv tuner. there is only one - of this, hard to avoind noises from all electronics in car.

 

I'm unsure whether I understand you correctly, but a few things to bear in mind:
1) The Bentley native display screen in the ZAB is very low resolution, so you will need to change the screen to a more modern standard so that you can display Android graphics.
2) You need a mechanism to switch between three inputs (1 Bentley, 2 Android, 3 Reversing Camera)
3) You need to feed the (new) touch screen presses to the Android computer.
4) You need to be able to capture and convert the low resolution Bentley video drive from the ZAB to high resolution if you want to display it on a touch screen. This is where I think you will struggle to find any modern head unit that can capture that old video drive signal.
5) My Arduino simply monitors the ZAB push button matrix, to recognise that a button (hard key or soft key) has been pressed, then it samples the matrix so that it can decide which button has been pressed, and after that it generates and transmits the appropriate I2C bus command to cause a (completely) separate video card to switch over. I'm not sure how it will help you...
6) The ZAB can select audio inputs, so you could simply feed audio up the redundant CD input.

Does any of this help..?

 

sorry for my terrible english )
1. yes ill try to find screen that has input for low res and hi rez
2. no only two. zab and another device
3.touchscreen often goes with new screens intergrated, problem is to learn that new unit to work with it (android box can without problems. even windows/linux can)
4. there are screens that can have diffwrent input. and even convertors for such things like https://car-solutions.com/en/video-i...y-continental/
5. you device i want to use for swithing between inputs on new screen
6. ill save oem changer so only one of av inputs

P.S and i dont want to use any remotes for swithing screns. Thay are ugly, just like my english.
sorry for that and thank you for your patience!

OR!!!!!!!!! I'll use oem screnn but will install touchscreen and video from new device will go on av input from tv tuner. and thats all. i need onlly navy and streaming of youtube. уvery carplay system can give it to me. and i dont need super resolution. i can leave oroginal. and tochscreen wil help. but, this varient is worst. But easiest to achive. Still, i don't know what android device to choose

 

Oh! for your request Beelink T4 Intel Atom® x5-Z8500 4GB+64GB it has microphone input but it is on win10. it is plus and - same time ) i'll think about it. there a a lot of devoces that ok for this, but that stupid 12v/ i don't know how to stabilize power. becouse sometimes it is 11v sometimes 14 and this is not auto device it is not ready for this jumps. just as apple tv

 

Stabilising power is simple: just use a DC to DC converter - they typically accept inputs from 6 to 30V dc and produce a stable 12V output. There are so many on the market that the biggest problem is knowing which one to choose.

 

Sorry for bothering you, but can you point me to such thing. And even better some working reliable. Thank You again!