TOYOTA 2010 Prius - Manual (Page 376)

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3-3. Using the hands-free system (for cellular phone)
Locking or unlocking the phone book
Select “Phonebook Lock (Phbk Lock)” or “Phonebook Unlock
(Phbk Unlock)” by using a voice command or .
Input the PIN by either of the following methods and select
“Confirm” by using a voice command or :
a. Press and say the registered PIN.
b. Input a new PIN by using .
Setting voice guidance volume
Select “Guidance Vol” by using .
Change the voice guidance volume.
To decrease the volume: Turn counterclockwise.
To increase the volume: Turn clockwise.
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