02-03 radio/audio pinout

[warshan]

I am looking for the pin-out for the 02-03 audio system.
specifically the rear speaker pin-out. I know that the rear speaker output is available, as there is a fader control on the audio system.
I am looking a building a wireless headphone system for the S2000. Great for those highway trips.
The rear output is perfect for this. I know that the 04-05 models use the rear output for the headrest speakers. the 02-03 model does not have the wiring harness connector for that.
Speaker output is a follows pin 7 - R+; pin 8 - L+; pin 17 - R-; pin 18 - L-.
Using this pattern I suspect that the rear output would be using pings 5,15,6,16.
Anyone with a 04-05 manual to confirm?