I have had the battery going dead problem with my 2008 LS460 for several years. Battery kept going dead even when I replaced the battery a couple of times. Finally, Lexus dealer said that a faulty door switch made the auto light function for hours and that drained the battery. The dealer fixed it but I still had the problem. I ended up just buying a new car in 2018 to avoid the problem! But I kept the 2008 as an extra car when my children visit from out of town. Then this last week the battery was dead again and AAA said I needed a new battery, which I got. Then a week later the battery went dead again when my son drove the car. Is the light switch or something else drawing the power? I could take it the dealer again and pay some more money to “fix” it, but anyone got an idea of what is causing this?