DURING RAIN STORM, WATER SEEPEED INO AIR COWL INTO CABIN-PASSENGER SIDE- FLOODED FLOOR EVENTUALLY SAM ELECTRONIC MODULE UNDER FLOOR WAS DAMAGED AND SHUT OFF ELECTRONICS IN AUTOMOBILE WHILE DRIVING AT HIGH SPEED ON FREEWAY- WITH OUT POWER CONTROLS OPERATING IT MADE DRIVING AND STOPPING THE CAR A VERY DANGEROUS FEAT EVENTUALLY WENT OFF ROAD INTO GUARDRAIL AND STOPPED. MERCEDES BENZ HAS BEEN AWARE (A LAWSUIT WAS FILED IN CA) OF DESIGN DEFECT OF AIR COWL DRAIN CLOGGING AND FLOODING CABIN BUT HAS KEPT THIS DANGEROUS FLAW FROM OWNERS EVEN THOUGH WE LEARNED THEY HAVE FOR SALE AN UPDATE KIT TO PREVENT THIS AT OWNERS EXPENSE. OUR CASE FORTUNATELY DID NOT CAUSE A FATALITY BUT IT COULD HAVE EASILY HAD IF THE VEHICLE WAS NOT BEING DRIVEN BY AN EXPERT DRIVER- LOOSING POWER CONTROLS ON A RAIN STORM/ WET ROAD WITH NO POWER ACCESORIES / BRAKES IS NOT A SAFE CONDITION WHICH NEEDS TO BE ADDRESSED ASAP FOLLOWING THIS MISHAP WE CONTACTED LOCAL MERCEDS DEALERSHIP IN PLANO,TX AUTOHAUS WHO RESPONDED BEING UNAWARE AND HAD NO HISTORY OF SUCH PROBLEM- APPARENTLY MERCEDES IS BEING WRONGFULLY SECRETIVE OF THIS SERIOUS FLAW NOT ONLY TO CONSUMERS BUT THEIR OWN PEOPLE 9