Update...
A few weeks ago I saw a blue
BCM for sale on ScumTree. Was just removed from a ute and was a direct match. Price was acceptable. Timing was perfect.
So took a few weeks before I got around to fitting it.
I ran through the PATS relearn and the Module reset.
....and the bastard started !!!!
So it seems my
BCM had failed. Not sure how/where/what.
I had to go back to work (month on, month off) so I didn't have any time to road test properly. But I'm hoping that's the end of the Smartshield issues.
Big thanks to asimplelife for all the sound advice...and others who added their thoughts.
I am still in shock from the dashboard design. I've taken dashboards apart in plenty of different cars over the years, but the lower dash design in the Falcon is the stupidest, nastiest most difficult to access/remove mongrel I've ever worked on.
For anyone stumbling across this thread - don't be afraid to download Forscan and have a go yourself.
My particular error codes were from the IC (inst. cluster)
...but that is a proxy for the
BCM.