Why would the front passenger seat in a Lexus LS not be moving forward and backward?
I would guess that something might be jammed in the tracks or it is an electrical issue. Sometimes the connections to the switches are bad, sometimes the switch itself is bad, and sometimes the moter is burned out. Listen to hear if the motor is running, if so, check the track and see if it is jammed. If you don't hear anything you have some electrical tracking to do. VBD