dan02gt

I wonder the same thing. I also noticed on mine that I had both the green and the purple RCAs connected. I know the purple is unused but have no clue if it goes somewhere or is just a open circuit. If it goes somewhere it may be causing feedback to the head unit. To me the issue seems related to the factory subs and amps. I disconnected the purple RCA but have not really been able to do a good test to see if the issue is fixed. These head units do put out like 4 volts on the pre-amps maybe it's too much for the stock amps and there is some type of feedback that is causing the head uni

Did you guys ever find a good solution to this? I have a AVH-P3200BT in a 2006 Mustang GT w/ Shaker 500 and the PAC C2R-FRD1 and I'm having the same issue. I've tried running the head unit off the battery and installing the relay on the ACC and none of this helped. The issue seems to be related to the factory subs and amps. I really believe that the current draw from the factory amps at volume is somehow causing the PAC to reset and this causes the head unit to reset. When I had the relay connected to the ACC I could hear it click back on during the reset of the unit. This tells me that