Originally Posted by gmontero1

I am trying to fix my neighbors stereo while her husband is in Iraq, I too am stumbled by the little black plug that is next to the antenna plug on the back of her stock stereo.
What is it? Does it need to be plugged into her new stereo somewhere?
There is nothing plugged into the S-Video looking output of the stock radio so i assume that means she does not have the infinity built in amp.
I have installed dozens of stereos in Hondas, BMWs, Volvos, and Toyotas, they were all older models though so they were really simple. This black plug confuses me. Thank you for your help.