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.
|20160106: original write-up|
|20160124: added clarifications (also see new writeup on the not-so-failsafe firmware update)|
|20160319: added connectors on new page|
|20160320: added forcing invocation of failsafe|
|20160320: added more teardown photos|
|20160324: YouTube video tech tour of benchtop junkyard Mazda Connect|
Various trim levels of the 2014+ Mazda3, 2016+ Mazda6, 2016+ MX-5, 2016+ CX-3, etc., have a touchscreen infotainment system called "Mazda Connect" in some markets and "MZD Connect" in others.
What follows are two summary images of a teardown of the controller unit:
Powering it is a Freescale i.MX6 ARM Cortex-A9. The "D" of the part number would seem to suggest a dual-core, but the serial console *claims* quad-core (normally denoted with a "Q").
The CAN bus interface is not left to flighty GUI software running on the main CPU and is handled by a dedicated microcontroller.
The Wi-Fi (also Bluetooth) PCB antenna protrudes outside the metal enclosure otherwise encasing the PCB.
The CPU, CPU PMIC, and DDR3L memories are all heatsinked.
The back-up camera is a conventional analog unit that is digitized onboard.
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