Lexus GS460 Owner's Manual page 354

3-4. Using the hands-free system (for cellular phone)
Setting the volume
Display the "Phone Settings" screen. (P. 353)
STEP 1
Touch "Volume" on the "Phone Settings" screen.
STEP 2

STEP 3
STEP 4
When you complete all settings, touch "Save".
STEP 5
Adaptive volume control
■
When traveling at 50 mph (80 km/h) or more, the system automatically raises the
volume one level.
If the vehicle speed drops to 43 mph (70 km/h), the volume will return to its original
level.
To return to the default volume settings
■
Touch "Default", and then "Yes".
354
GS_G_U (OM30C11U)
May 21, 2010 1:06 pm
Choose the volume setting switch.
"Voice Volume": changes the 
speaker volume
"Ring Volume": changes the ring 
volume
Touch "-" or "+" to lower or raise
the volume, and then "OK".