Does anyone have a set of the service amnuals (on CD)? There must be a schematic for the wiring of the factory phone. I went to the Nokia web site (http://www.nokiausa.com/accessoriesphone/1,2524,6185,00.html), and called up a detailed explanation of the car kit. I think everything is there to hook this puppy up. Similar information must be available for other manufacturers car kits. It even indicates that it will work with an external antenna, ignition sensing, and car audio mute. It does not say what the impedence of the external speaker it drives is. so there may be a load differnce tht needs correction.
Don't know if this helps or adds to the confusion, but I intend to give this a try this summer.
94 E500 (Silver/Black)