TOYOTA 2010 Camry HV - Manual (Page 284)

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