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Radio doesn't know or care if the amp is there, it's not on the iBus like DSP cars. I suspect if you put in a CD, press the clock button or tune the radio the display will update accordingly.
You may have one of several problems depending on your equipment; Nav has captured the audio (unplug nav drive), phone has captured the audio (unplug phone module), amp has water damage, amp fuse gone, amp power stage blown.
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