Anybody else having this problem even when hitting the lock button twice? Mine seems to do it the most when it's a little bit more colder outside. I can't explain the reasoning behind that but it definitely doesn't do it during the summer. I've had my car for the past 2 1/2 years and it's been like that each year. Any suggestions?

 

I never had this issue with my 4gs but i did with my 3GS. Turned out it had to do with the door close sensor. It would malfunction and apparently send a signal that it was open sometimes causing the lights to stay on. I never say the door open sogn on the dash so i would have never thought to check it. Swapped out passenger sensor and problem was rectified. Not sure if yours is the same issue but worth a shot.

 

Did you tell your Lexus dealership about it and have them check it when it was under warranty?