Lexus 2015 CT200H - Page 258

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5-2. Using the audio system
CT200h_OM_OM76134U_(U)
Turning the “TUNE•SEL” knob clockwise turns on the ASL, and turning the
“TUNE•SEL” knob counterclockwise turns off the ASL.
ASL automatically adjusts the volume and tone quality according to the noise level as
you drive your vehicle.
Turning the Automatic Sound Levelizer (ASL) on/off