My RX350 is over 4yrs old with 105k km on it. I notice lately when I drive off the seat moves back a bit and when braking hard it moves forwards. It is about quarter of an inch movement but it is noticeable. I guess it is not under warranty now. I looked under the seat but can not find where this is coming from, I am assuming it must be a loose bolt that needs to be tightened.
Anyone have an idea how I can do this?
Thanks.

 

My other vehicle(not a Lexus) had the similar problem and it was the rack for the power seat.

 

Thanks, was there a fix for it?

 

Needs new rack.

 

I would try removing the little covers that cover the bolts that hold the seat in and re tightening them. Maybe they backed out a bit. If they did then take them out add a little loktite and retorque.