Kia RIO Owner's Manual page 230

Features of your vehicle
AUX
This feature is used to play external MEDIA
currently connected with the AUX terminal.
AUX mode will automatically start when an
external device becomes connected. If an
external device is alreadyconnected, you
can also press the MEDIA key to change to
AUX mode.
❈ AUX mode cannot be started unless
there is an external device connected to
the AUX terminal.
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✽ ✽ NOTICE FOR USING THE
AUX
• Fully insert the AUX cable into the
AUX terminal for use.