2009 Toyota Tundra Owners Manual - Page 412
2009 Toyota Tundra Manual
Page 412 highlights
3-4. Using the hands-free phone system (for cellular phone) 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 Initialization clockwise. Select "(INITIALIZE)" and then "(CONFIRM)" by using . Select "(CONFIRM)" by using again. 384