Aux input connection

So I have noticed that with the placement of the aux connector in the center armrest that anything can damage it if you leave a cord plugged in, and with mine occasionally it drops the connection. Now I'm not willing to spend $110 for the little circuit board, so I was hoping i could attempt to fix it. Now the problem is i can't seem to figure out which wire is which on the connector. They go green, red, grey, white. What I plan to do is take the sense wire and connect it to ground. But am not sure which wire goes where. Anyone help?