That can be an indicator of low voltage. It's covered under "Electrical Load Management" in manual 412-04 Climate Control System - Control Components - Description and Operation.
There may be other stuff going on, because there's a number of inputs to the load management system, but it tells the radio to restrict it's volume as part of the load management priority system. You should be seeing an increase in idle speed in an attempt to counter that.
Need fault codes for further diagnostics.
				
			 
			
		 
			
				
			
			
				MY08 D3 - The Antichrist - "Permagrimace". Turn the key and play the "will it get me home again" lottery.
			
			
		 
	
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