JCI (the company that Mazda hired to design the CMU) has created a flawed design. If your CMU is broken, there is no repair that a user can do. Do NOT contact me asking how to fix your CMU.
UPDATE on 20180324: there is a discussion on an external forum that may provide further information regarding connectors
In response to a request, here is some further information on the connectors.
There is a high risk of damaging the electronics, so DO NOT ATTEMPT TO CONNECT TO THIS DEVICE. You alone are entirely responsible for your actions.
The most important connector is the one labeled "power&more" in the photo. I would speculate that it is made by JST, but I have been unable to find a source that sells it.
The "power&more" is needed to power the CMU. In addition...
On the "power&more" connector, there is an undocumented 3.3V logic level console UART (bit rate settings of 115200,N,8,1). Both the "failsafe" and normal application use this. (The normal application spews out so much debugging garbage that I suspect that it may also slow down the software.)
Even if you have the connector salvaged from a junkyard (as I do in the photo), it does not have the pins populated for these signals.
The "audio&more" connector for the harness does appear to be TE 1717115-1.
The "GPS" connector is another mystery. It is similar to other connectors, but uses unique keying.
USB1, USB2, and the display harness connectors are all of the Hirose GT17HN family. Each has unique keying (with associated color) to prevent incorrect insertions.
USB1 is green keying, and is what is cabled to the powered hub in vehicles. USB2 is blue keying, and I had to specially make the cable; I think it is provision for a future vehicle with multiple USB hubs. The display uses brown keying.
Do NOT use the USB ports without a POWERED hub.
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