Try this link for information on you Pre-Safe problems.
http://www.autoevolution.com/news/how-does-mercedes-pre-safe-work-6535.html
Not sure but you may need to have the computer reset ?
SOURCE: Dash reads srs 2 malfunctions pre safe inactive,
SOUNDS LIKE AN ELECTRICAL SHORT.ARE THE FLOOR CARPETS WET.IF THE DRAIN TUBE CLOGS FOR THE INTAKE AIR DUCTS BELOW THE WINDSHIELD,WATER WILL OVERFLOW AND RUN INSIDE THE CAR.THE REAR SAM (SIGNAL AQUISITION MODULE) IS UNDER THE REAR SEAT ON THE PASSENGERS SIDE.WHEN THIS MODULE GETS WET,ALL KINDS OF STRANGE PROBLEMS DEVELOP.
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