Audio transmission signal function

WARNING: This page is about a different car, the 2021 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

The 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 CMU receives audio signals from the voice recognition microphone and performs operations according to the commands.