MDU display, possible to change what is displayed? - MTCB Software Development

Hi Guys
does anyone know a way to change what appears on the upper display on the attached pic? there has to be some app that sends information to the canbus and then displays
some cars have these displays some dont
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Help us much appreciated!
Thanks
Dan

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I think that has to do with the can bus decoder from your navi. I own a Vw-group car and cannot see anymore the song names / radio station names in the "red screen" (fis) of my car.
I think more/less info can be seen depending on what car you have. No additional application to solve this, afaik

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Its handled by the MCU which interfaces with the CAN Bus system, but support is very limited, you have a Mazda 3 ? Not sure its supported.

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yeah have a mazda 6 2009, hmm wish there was a way

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Have you tried all CAN Bus options in factory settings ? Including non mazda ones ?

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you mean the different vehicles manufacturers?, i have tried all the ones with mazda but then there is no where to modify what comes on the MDU

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I know, I was just suggesting you try them all in case one worked better. You could try and modify the app somehow so it shows something different, but that would require some coding knowledge, theres more info in the original thread about which app and stuff (its the same app for all cars and it appears or disappears depending on what vehicle manufactuer you have chosen in factory settings/CAN Bus) and youd have to spend some time searching the thread to find it.

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ive tried decompliling the radio apk and looking into it but cannot find anything

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I guess youd have to know what code to look for and what code the car uses as well.

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do you know anyone who could have a look?

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Not really, you could try other XDA members in the MTCB section, like @agentdr8. Try googling it, I ve deffo seen something on youtube about setting the clock on the Mazda 3 with MTCB headunits.

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I had an EONON radio in my mazda 3 2008 it had an canbus interface, and the mdu display got new text modes messages beceause of that ?? cant recall where i saw the mdu protocol decoded and explained.

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coromonadalix said:
I had an EONON radio in my mazda 3 2008 it had an canbus interface, and the mdu display got new text modes messages beceause of that ?? cant recall where i saw the mdu protocol decoded and explained.
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There are no EONON radios, EONON are only sellers, what unit was it ?
You mean MCU protocol or CAN Bus protocol for Mazda 3 ? I think you mean MCU protocol - its been decoded and was posted on XDA a few years back.

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​it was the d5151 i think, it was an windows ce based radio, it had the canbus adapter option, and a direct fit to the mazda dash, the only problem was the bottom snaps were not strong enough to retain the radio firmly to the dash center panel, when hitting road bumps, the radio simply unsnap himself, there was only 2 top screws ???
It added new displayed settings in the mazda car display. But i sold the car 1 month later, have'nt tried all the options.

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coromonadalix said:
​it was the d5151 i think, it was an windows ce based radio, it had the canbus adapter option, and a direct fit to the mazda dash, the only problem was the bottom snaps were not strong enough to retain the radio firmly to the dash center panel, when hitting road bumps, the radio simply unsnap himself, there was only 2 top screws ???
It added new displayed settings in the mazda car display. But i sold the car 1 month later, have'nt tried all the options.
Click to expand...
Click to collapse
Right, I see what you mean. Sounds like having one would be useful to see how the code works.

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here for a start, just found out :
http://www.rx8club.com/series-i-tec...st-can-gauge-ever-oem-red-lcd-display-195323/
http://www.rx8club.com/series-i-int...-24/modding-oem-lcd-display-act-gauge-185320/
https://www.diyautotune.com/support/tech/other/displays-data/
http://www.aapexshow.com/2014/Custom/Handout/Speaker0_Session572_1.pdf
this one explain the protocol
http://www.madox.net/blog/projects/mazda-can-bus/comment-page-1/
have fun reading

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Does your head unit have a two-way CAN bus? This would be the +/- CAN wires going into the actual unit as opposed to just the decoder module. If it's like the CAN SWC, it may need these to send data to the vehicle. Of course, this is assuming the radio app even communicates song info to the CAN app, which I would be surprised if it did.