Termination point for cell phone kit in center armrest for..

I was hoping I could tap into the collective wisdom of the internet
and find a solution to my problem. I am trying to find a wiring
diagram or the termination point for the cell phone kit in the armrest
of the 2000 A4. My plan is to modify an Ipod adapter so I can utilize
the RJ plug in the armrest to plug my Ipod into. Any assistance on
where I can get a copy of the wiring diagram or termination point(s)
for the cell phone kit would be greatly appreciated.