Hello,
I have a 1999 Lexus GS300 and suddenly today the auto up function on the driver's side window is not functioning. The window will auto down and manual up with no problem, just the auto up feature is no longer working.
Thanks !
AL

 

If you did a search in the forums (or google) you'd see that usually this is an easy fix.

For most Lexus vehicles of that era:

(a) Turn the ignition switch ON.
(b) Halfway open the power window by pressing the power window switch.
(c) Fully pull up the switch until the power window is fully closed and continue to hold the switch for approx. 1 second after the power window is fully closed.
(d) Check that the AUTO UP/DOWN function operates normally.

 

pbm's solution may work. But even if it doesn't, installing a new regulator is not a difficult or particularly expensive repair.

 

After further review it seems that the switch may be the culprit. I'll try the window reset but I'm pretty sure that's not going to work, would be great if it did though. Found a local who's junking his GS and has the switch available for $40. Seems like replacing the switch is not very difficult at all.