Hi... 1999 ES300... I'm new to the forum having inherited my mom's car (with only 85K miles!)

Under acceleration, the driver seat rotates back
If you were standing outside the driver's door you would see from the side that both seat and back cushions rotate clockwise by a couple centimeters.
It's a power seat.
The passenger seat stays firmly planted.
I can manually pull / push on the driver's seat and confirm the axis of freedom.
Looking under the seat (and comparing to the passenger's) nothing seems obviously broken. I was guessing that a retaining clip of some sort has become dislodged to allow the movement, but that's only a guess.

Does anyone have any experience with this problem (search didn't turn up anything)? Or know how these power seats work?

Thanks in advance!

 

Pull the seat out and inspect the mechanism for damage. Remove the negative battery terminal first. Worst case you can get a used seat and exchange your cushions onto the replacement.

 

I looked under the seat ... nothing obviously broken.

Before I pull the seat, does anyone have either a picture or a diagram of the bottom of the 1999 ES300 driver's side power seat so I can see what normal looks like?