TOYOTA 2011 Highlander - Manual (Page 369)

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3-4. Using the hands-free phone system (for cellular phone)
Setting voice guidance volume
Select “Guidance Volume” using .
Change the voice guidance volume.
To decrease the volume: Turn counterclockwise.
To increase the volume: Turn clockwise.
Initialization
Select “Reset Settings” and then “Confirm” using .
Select “Confirm” using .
STEP 1
STEP 2
STEP 1
STEP 2