Thanks, Mike, that does seem like the elegant way to turn it off. I learned by trial and error, the DC/DC converter puts out 5V on pin 6, and you short it to ground to inhibit.
I cut the MCM's DVINH wire, so it's all manual now. The DC/DC converter still reports its temperature to the MCM, which can run the IPU fan, but I don't know if the DC/DC's overheat shutoff logic is internal, or inside the MCM. Nor do I know if a DC/DC converter has ever overheated with the IPU fan running.
I bet you can run the DC/DC without the key in the ignition, for one-plug grid charging. I figure if you energize DC/DC pin 1 (IGN) and the HV contactor relay, it should start charging. You'd also want to either boot the MCM, or run the IPU fan continuously.
Speaking of the HV contactor relay, do you have to energize that to grid charge anyway?
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