Toyota 2014 Sienna Manual page 476

3-2. Using the audio system
■
Adjusting the Automatic Sound Levelizer (ASL)
Type A
When "ASL" is selected, turning
"ASL" level in the order of "LOW", "MID" and "HIGH".
Turning
ASL automatically adjusts the volume and tone quality according to vehi-
cle speed.
Type B and C
STEP 1
Press
STEP 2
Press
STEP 3
Press
STEP 4
Press
Type B: "LOW", "MID", "HIGH", or "OFF"
Type C: "ON" or "OFF"
ASL automatically adjusts the volume and tone quality according
to vehicle speed.
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to the left turns "ASL" off.
.
that corresponds to "MORE".
that corresponds to "ASL".
that corresponds to the desired mode.
to the right changes the