TOYOTA 2010 Sienna - Manual (Page 316)

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3-2. Using the audio system
Using the steering wheel audio switches (if equipped)
Turning on the power
Press when the audio system is turned off.
The audio system can be turned off by holding down until you
hear a beep.
Some audio features can be controlled using the switches on the
steering wheel.
Volume
Radio: Select radio stations
CD: Select tracks, files
(MP3 and WMA) and discs
RSE: Select tracks and
chapters
Power on/off, select audio
source