With L2 (actually car is charging at 80%), press brake, ON button, no heat (I have been pressing three bars seat warmer on quick visits to the car)
ON button, no heat (there are at least two different non-driving power up modes, I need to re-read that part) {okay, pressing the ON button once (no brake) puts it in accessory, twice supposedly turns on all electrical gear, I get climate fan (all speeds), but still no heat.}
But my climate pre-conditioning does work - Still plugged in as before (no changes) - Sitting in the car (car is OFF), press lock remote, press and hold climate, get 3 flashes of lights, followed by 3 more. nothing for about a minute, then some slight air flow, then full bore warm air (possibly pre-heats some heating elements somewhere). Only stayed for a few minutes but the air was already up to about 68F (not the cabin yet, just the beginning of warm air). Opening the door to exit turned off the climate pre-heat.
I keep looking, the only other weird mode is car wash power saving mode, I think on page 386, but I think you would get a note in the driver display. Oh well, lets see what the dealer says, unless you or someone solves the mystery before then.