NOTE:
“iPod” is a registered trademark of Apple Inc. in the United States and other countries.
Outline
An Auxiliary jack/USB port unit has been adopted which can connect to commercially-available portable audio/USB devices/iPod, and output sound from the speakers via the audio unit.
A USB adaptor has been adopted for transmission of information between a USB device connected to an exterior input unit and the audio unit.
Structural view

Block diagram
With audio unit (without display)

With audio unit (with display)

Audio Pilot®2 Microphone Removal/Installation
Audio UnitFront Seat Rail Guide Cover Removal/Installation
WARNING:
Handling a front seat (with built-in side air bag) improperly can accidentally
operate (deploy) the air bag, which may seriously injure you. Read the service
warnings before handling a front seat (with built-in side air bag)..
CAUTION:
After removing a front seat ...
Stop Vehicle in Safe Place Immediately
If any of the following warning lights turns on, the system may have a
malfunction. Stop the
vehicle in a safe place immediately and contact an Authorized Mazda Dealer.
...
Blind Spot Monitoring (Bsm) Control Module Removal/Installation
CAUTION:
If the BSM control modules are installed with the left and right modules
reversed, a DTC will be displayed and system will enter the fail-safe function.
Therefore, confirm that the left/right BSM control modules are installed correctly.
1. Disconnect the negative battery ...