AVC
The system has a feature called Automatic Volume Control (AVC). With AVC, the audio system monitors the noise in the vehicle. AVC automatically adjusts the volume level so it always sounds the same to you. To use AVC, touch the AVC button. If the button is green, AVC is on and if the button is blue, AVC is off.For a description of the RPO Code(s) shown in this image/article refer to the RPO Code List found at Vehicle/Application ID RPO Codes