Van must be "ON", not ACC
Menu (on center/Nav)
Other Vehicle Settings
Drivers Side Easy-Exit Slide
Options are Full, Partial, and Off
I have 2013 Sienna, same problem. Always squashed something behind driver seat whenever got out of the car, really annoying. Dealer couldn't turn it off. Thus, I disconnected the seat motor under the seat. Only sliding front and back motor. That motor located at under the seat, front and door side. Very easy disconnect the clip, push down notch and pull the clip. Any other power mode remains work.Great. Please tell me how to turn it off. So annoying.