Bluetooth carkit installation
I want to connect Parrot CK3000 Bluetooth handsfree kit.
http://www.driveblue.com/
My accura 2003 3.2TL-S with navi and onstar.

I read somewhere that 2003TL-S with Navi have 2 mute input, one used from navigator to mute front only, other from Onstar to mute all spreakers. I want connect to one which mute all inputs.
It also connect to speaker wire. It is connected inside speaker wire, using internal switch to output pass through audio from stocked unit, or output phone conversation. Basically it simple connection, all I need to find wires to speaker (left and right) and input to connect mute wire from my kit. I think it use ground to mute, but if necessary I can put relay or diots to make it compatible. Does anyone did it, and where can I get location and pinout of radio connector on stocked head unit (6cd changer/BOSS). I do want to preserve audion, onstar and navi functionality intact.

Does anyone have wiring diagram for stocked unit, with location of output to door speakers and mute input?
Thank you