Toyota 2009 Tundra Owner's Manual page 389

Steering wheel telephone switches
n
Microphone
n
3-4. Using the hands-free phone system (for cellular phone)
Volume
The voice guidance volume
cannot be adjusted by using
this switch.
Hands-free phone system
off/ends a call/refuses a call
Hands-free phone system
on/starts a call
Press: Voice command sys-
tem on
Press and hold: Voice com-
mand system off
3
365