Hi SRT6exy,
Okay, you've proven that the wiring of CAN BUS from the SLA is okay. You should be reading roughly battery voltage (~12V), but not on the CAN BUS pins (I think the 0.7V across the CAN BUS is okay). I don't know off the top of my head which SLA or TCM pins are power and ground, but usually ground wires are brown, and power are red. If you find power at both the TCM and SLA, then my guess is that it's probably the SLA. Some people have had success spraying contact cleaner on the SLA circuit board, but that doesn't always work. BUT before you replace the SLA, see if plugging everything back in (you don't need to plug the center console back in), is the black rectangle still there? Will the car start? Have you cleared the DTC error codes and re-read them to see if they have changed. Also, check around the TCM for any transmission fluid - use a white Kleenex and wipe around the harness and general area. Are there water stains around the TCM area? (We're starting to get off into the less likely causes, but they do happen.)
-Jerry