Mazda CX-9 2016 Owner's Manual page 42

REAR SEAT USB CHARGER
The rear seat console has two 2.1 amp USB chargers which charge your
device so that you can play music through the device (iPod, phone, etc.),
but not through the vehicle audio system. Refer to the Owner's Manual for
additional information.
USB Ports
NOTE:
When using a USB memory stick, the system plays the first audio file when
restarting the vehicle. It does not start where it left off when turning off the engine.
12 VOLT ACCESSORY SOCKETS
The accessory sockets are on with ignition in ACC or ON. There is an
accessory socket located at the front and rear of the vehicle.
NOTE:
When using the accessory socket, make sure to disconnect any device
from it when turning off the ignition; otherwise, the vehicle's battery could go dead.
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Front ACC Socket
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Rear ACC Socket
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