2009 Toyota Sienna Owners Manual - Page 358
2009 Toyota Sienna Manual
Page 358 highlights
3-4. Using the hands-free phone system (for cellular phone) n Steering wheel telephone switches Volume The voice guidance volume cannot be adjusted using this button. Hands-free phone system off/ends a call/refuses a call Hands-free phone system on/starts a call Press: Voice command system on Press and hold: Voice command system off n Microphone 332