Well, for those of us with the right truck it is.
You need to have a 2003 AV (or have added the steering wheel controls to yours) withOUT OnStar. Pressing the OnStar button on the steering wheel (looks like the profile of a man talking) acts as a radio mute button. I found this out by accident while playing with all the buttons. Saves me having to reach for the radio whenever my cell phone rings or when pulling up to a toll or fast food window.
You need to have a 2003 AV (or have added the steering wheel controls to yours) withOUT OnStar. Pressing the OnStar button on the steering wheel (looks like the profile of a man talking) acts as a radio mute button. I found this out by accident while playing with all the buttons. Saves me having to reach for the radio whenever my cell phone rings or when pulling up to a toll or fast food window.