To the gentleman who was experiencing battery drainage on his SC430. Did you ever get this fixed? We have a 2005 SC430 & are having the same problem. We had a Viper autostart put in 2 months ago & it seems ever since then the battery is dead after a few days of not running. Lexus dealer tested & found nothing wrong. Company that installed starter ran electronic checks, battery charge, alternator, etc. & found nothing.