I am not sure if there is a amp dedicated fuse or not, I'll look. But yes that could be the problem. For whatever reason, it sounds like the amp is not powering up.
With the driver's side door open and the key in the ignition do you have warning chimes? Or do you have any warning chimes of any kind. Also, you can push the onstar button and if you get sound, then it is most likely a problem with the radio and NOT the amp.
Not that it will help, but my next post will be from the service manual for this issue.
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