TOYOTA 2010 Sienna - Manual (Page 322)

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3-3. Using the rear audio system
Ejecting a disc
Press and remove the disc.
Headphone jacks
To use the headphones, con-
nect them to the jack.
To adjust the volume
Right side dial: Turn it toward
the front of the vehicle to
increase the volume. Turn it
toward the rear of the vehicle
to decrease the volume.
Left side dial: Turn it toward
the rear of the vehicle to
increase the volume. Turn it
toward the front of the vehicle
to decrease the volume.