factory stereo wiring, 05 ram

I have a late model 2005 dodge ram quad cab w/ the 5.7 hemi 4x4. I have purchased the can-bus for this vehical but i am still having problems finding the right wiring for the systems involved. There is a WHITE/ putple wire in the back of the factory stereo that says it goes to a "j1850". i dont know what it is but have found out the it is important to the vehical as the reverse, brake, airbags and some other systems will not work. I also can not get a voltage reading from this wire. Can any one help or does anyone have a good wiring diagram for this modle dodge ram. Thank you

After a lot of huntiog and digging around, with no help form anyone here i cam up with this diagram http://www.j-and-r-williams.com/Ram/Remote%20Start%20Wiring.pdf This is from Directwire.com and is theonly one that should be used on the 05 doge rams. thanks