I bought the car at an auction and didn't have a radio. I have started installing an aftermarket stereo. It works fine with the 2 front speakers. I need to decifer how to hook up the headrest speakers through the consol control so they will work. (I am suspicios of the amp not working so I will instal an aftermarket amp) I have the schematic of the different wire colors but it doesn't tell me what they are for (e.i. +,-, amp+, etc). I even bought a aftermarket harness but it only has 12 wires. My car harness has 16 wires.

Thanks in advance