I have a 2002 S500 which has a battery drain issue if left overnight. Drivers side mirror signaled a problem, then the alarm would start going off. Dealer replaced the alarm but the car continues to drain. New battery in July.....it reads in good shape. Once jumped warning indicator of drivers side mirror signal and airmatic come and go. Now the zenon drivers side front lamp is out. At dealer for 2 weeks......they have no clue at this point.