Just now, SOMETHING made my 350SD think that I am a thief. I get it to shut up but only temporarily. I have tried shutting down, going outside, locking the doors and unlocking them again. It shuts up but then starts again. I have tried locking the doors from the drivers door lock and then pulling up again. NADA. I have had this about 3 months and this is the first instance of this. I looked at the fuses and cannot locate one that seems the one to pull. This is my 3rd S-Class but 1st diesel, my 2nd 1991. I have had 1975 280SEL, a 1985 280SEL, and nothing like this has ever happened. I can't use it till this is solved. This happens for as long as a key is in it, going off for a couple of minutes then going quiet. I hope I have described the situation completely. Please help.