BUT… The Aisin has its own control module, separate from the PCM. That’s what would have been flashed with the update, and the pcm would not be untouched. So, still not a sure fire way to determine pcm locked status (if there is even such a thing as a pcm flash that locks it).OK instead of hearsay here's personal experience. Took my truck to the dealer for the heated steering wheel not working. First thing they do is update the ECU to the most recent if available. Mine had an update needed for the Aisin so they did that.
Got a call from them that they could not get access past the security gate because I still had the bypass installed. No big deal - went down there and swapped the pins.
When I picked the truck up all updates were applied and guess what... the ECU wasn't locked down. The Aisin shifts oh so smooth now.
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