[Stretch58]

Yes I have a 2000 Factory Service Manual with wiring prints and a couple of 2000 Diagnostic Manuals(these Deal mostly with power train diagnostics and ABS diags.) I did buy the 2006 Wiring Diagram Book, but have not sprung for the main 2006 Service Manual yet. If they had a book that explains the software, it would make a lot of things clearer, but there is no way they would do that. The only source for some of that info. might be factory training course materials. For an instance of intermodule comm., I noticed once, that if the BCM looses communications on the CCD Bus with the ABS controller, it will assume the ABS is unable to turn on the ABS light, and the BCM will then turn it on.