mikecon3

Hello I have a stock ft0054a Fujitsu radio with nav and no HK amp. On the backside the radio has an additional unit below it, it's about 1 inch and black. it has 3 coax connections coming off one side. I am trying to find the pin outs for the gray connectors on the left side. My front speaker outputs go from the 16 pin white connector up top and go into the gray connector back into the radio.