LS460 2008, Check Power Control System
 

Hello. I have 2008 Lexus LS 460, it give a message "Check Power control" System. I tried to search on google but failed to see any discussion.
More over there is a strong vibration whenever i turn car towards left and it comes from Right rear wheels but it last for few seconds and at slow speed like below 40 MPH.
And can anyone tell me if the doors are hydraulic and are closed automatically like in Merc ?
Appreciate if someone can help with these three things.