Toyota 2006 Prius Owner's Manual page 200

D
Automatic volume settings for high
speed
You can set the volume one step up
when the vehicle speed is over 80
km/h. (When it is under 70 km/h, pre-
vious volume is back.)
Each time you touch the "Adaptive Volume
Control" switch, you can switch on or off.
200
D
Initializing the settings
You can initialize the settings.
27p241
Touch the "Default" switch.
27p242
Touch the "Yes" switch.