Can you move the seat with the power seat switch or with one of the Memory seat buttons? If the seat moves, might be a long shot, but try resetting/saving the Memory seat at a new position. Then turn off the car and see if the seat moves back.
If it still doesn't work, I'd have it checked out at Lexus. Keep us posted - curious since I personally never had this issue with all the Lexus cars I owned and don't believe to have seen this issue posted prior ...
I had this happen recently. Can't remember exactly what I did but it was a combination of moving the seat back and forward, then turning the seat exit feature off and on. It seemed to reset itself the next time I drove the RX. I already had the seat position in memory so I just needed to press the button to return it to what I like.
Just notice the same thing with my new 2013 ES350. Worked fine for a few weeks then stopped. I too have done all of the things mentioned in the thread, but no luck. Will be bringing that up when I go in for my 5k checkup.
I think by your wording it used to move back, and has stopped. But have you checked #18 of the link below? Maybe it was changed below by accident or memory leak. My audi used to forget MMI settings before I realized or the car warned of bad battery. Though you have new car so that probably isn't it.
Ok. I accidentally found out how to make the easy exit seat works again by lowering the seat a bit. I had the seat at its highest point and the easy exit does not work when the seat in that position.
I use the seat height adjust power button to lower it a bit. Then it starts to work...
Should I bring it back to dealer and get it fixed? Or is it working by design ?