UPDATE; Performed the two wire update, appeared to work for a while then I started getting the Park Brake Warning Screen and lock out. Thought I might have a problem with the second wire ground, so I checked it, still no joy.
Went so far as to remove the lower right corner of Connector 2 and manually place ground wire on the lower rightmost pin before replacing the connector, still no joy.
BTW, pulling power from the Z1 shut off the back up camera, took me a while to figure out how to get it turned back on.
Any suggestions would be gratefully acknowledged.
ajdillon