I did the jumper wire behind the switch and it works for one starting cycle and then locks the start/stop on. You cannot even manually disable it by pushing the button. Remove the jumper, cycle the ignition and everything goes back to normal. Tested this twice just to make sure I didn't mess up. I will just continue to push the button as part of start up. Not that big of a deal.
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I originally had the same or a very similar issue. I attributed it to a bad connection. Finally, i just put the jumper in one last time and left it. It cycled through fine each time I drove it. Not sure if there is a sequencing issue.
I would just connect it woth the ignition off, start one time and verify auto/start/stop remains off.
Mine has worked flawlessly since I made the kast connection with the ignition off.
Good luck!