Speed Compensated Volume (SCV)

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

In order to use the SCV, adjust the volume to the listening level you want and move the control ring behind the PWR-VOL knob to adjust the SCV.
The volume level automatically adjusts to compensate for road and wind noise as you drive.
As you drive, the volume level will change in order to compensate for the noise present at any particular speed.
Each detent on the SCV allows for more compensation at a faster rate.