Well, our greyhawk does too, and has ever since 2012 when new. It took me about two hours to finally figure it out. Even though the stereo, cd, camera unit is off, it still emits a tone that just bugged me. My husband being partly deaf,
It didn’t bother him, hehe. Found out on our unit, you have to turn on unit, then turn down the volume until you can’t go any further then turn off the unit. That took care of it for us, except that every time you turn on the unit to watch camera, music, you have to do the same thing……. Hopefully that will take care of your issue too. We have a clarion, not sure if it’s set up same way on different brands. Good luck
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