Audio transmission signal function

WARNING: This page is about a different car, the 2024 Mazda CX-90. However, it is still accessible from the selected car via links, so may be relevant.

The connectivity master unit (CMU) transmits the audio signal received from a mobile device such as the following USB port/SD card slot hub and Smartphone devices to the remote tuner (RT).
The connectivity master unit (CMU) receives audio signals from the voice recognition microphone and performs operations according to the commands.