I've wanted to update this thread for a while, but other distractions have taken priority.
Earlier this spring electrical problems popped up in my 2007 Yukon Denali. I won't bore you with ALL the details but I will share with you the problems encountered, and the Root Cause.
Randomly while driving and often all together, the electronic chime would go off, the door locks would cycle unlock/lock, unlock/lock, the traction control system would disable/re-enable, the transmission would go into 'limp-home' mode. And the cherry on the top, sometimes after parking the car the VATS system would completely disabled the start circuit, giving an indication of a dead battery. This happened, rain or shine, not specifically related to water intrusion.
I finally realized the commonality to all this was the CAN BUS. So I inspected the wiring and found the CAN BUS twisted pair chaffed, specifically at the transmission TECHM plug.
Over time the TECHM bundle plastic loom cover disintegrated and broke away, leaving the wires unprotected. With the loom covering gone, the unprotected wires would occasionally lay against the transmission heat shield. The shields job is to minimize heat migration from the exhaust system to the transmission and nearby components. But with the CAN BUS pair covering unprotected, partially melted, and the BUS intermittingly grounding, the Body Control Module was not able to deal with the broken data stream.
In the end the solution was simple. Repair the wires, replace the broken loom sleeve, and the electrical problems would magically disappear. And it worked!!
A C6 electrical system have been planned for this restomod from the beginning. The electrical problem with the Denali provide me with a better understanding of CAN BUS systems in general, and how the sensors and modules relate to one another.
I guess one could say, this has been a 'blessing in disguise', as I have been gathering a lot of C6 electronics over the last few months.
More to come...