TOYOTA 2011 Tundra - Manual (Page 444)

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3-5. Using the hands-free phone system (for cellular phone)
n Steering wheel
Volume
The voice guidance volume
cannot be adjusted using this
button.
On-hook switch
Turns the hands-free sys-
tem off/ends a call/refuses a
call
Off-hook switch
Turns the hands-free sys-
tem on/starts a call
Talk switch
Turns the voice command
system on (press)/turns the
voice command system off
(press and hold)
n Microphone