Automatic Volume Settings For High Speed; Initializing The Settings - Toyota PRIUS Owner's Manual

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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.
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Initializing the settings

You can initialize the settings.
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Touch the "Default" switch.
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Touch the "Yes" switch.