TOYOTA 2010 Prius - Manual (Page 354)

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3-3. Using the hands-free system (for cellular phone)
■
Steering wheel
Volume
The voice guidance volume
cannot be adjusted by using
this button.
Press: Voice command sys-
tem on
Press and hold: Voice com-
mand system off
Hands-free phone system
off/ends a call/refuses a call
Hands-free phone system
on/starts a call
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