I am hoping, beyond what I can search here, someone has or has seen a
good scope trace of the Duty C signal. In a perfect world, there would
be a trace from an '00-'03 and one from an '04, when apparently the
signal polarity was changed.
Before '04, +12V to the duty C disabled the AWD, '04 and above, +12V fully activates the duty-C and the AWD.
What I am hoping is that I can get reasonably close to the proper signal by using a few transistors to 'invert' the signal.