Mazda 3 CMU

The Connectivity Master Unit (CMU) is the central controlling unit for a lot of the communications in the car, receiving information from the car, but also user devices (like phones through bluetooth, or radio).

Mazda CMU: Updates

I usually start any research by looking at normal usage to get an understanding of the system, understand the interfaces, etc. Since it’s my car, I’m quite familiar with the user exposed parts. Next is usually the firmware upgrade process to get a clean version of the firmware. Luckily, the CMU gets fairly regular updates, but they are usually installed by a dealership. CMU updates Searching for CMU updates leads to various options to download the ....

Mazda CMU: Intro

Staring at a screen for too long always starts those curious thoughts about what’s driving it, where the data comes from, whether it can be messed. I held myself back for a very long time because I can’t risk bricking an expensive car, but at least I wanted the fancy new CarPlay upgrade. Unfortunately the dealership quoted a ridiculous price of $500, so I took matters into my hands anyways....