No I have never determined why may smart won;t start, I thought it was the SAM unit so I sent the SAM unit,ECU, instrument cluster and a key to SOS diagnaustics and they put my modules in there test car and everything worked fine. my ignition tests good, the imobilizer ring is good. I have narrowed the problem down to the CAN Bus I think.person with smart car wont start, mine doing same thing did you ever figure it out, mine had a cup of water spill on the dash, right over the fuse box then quit
The Smart cars are notorious for having leaking windshirlds, seems the windshield leaks and lets water get on the SAM unit and shorts it out or corrodes the conections and causes the SAM unit or connections to fail. In your case spilling a cup of water onto the SAM unit (fuse box) if the car quit immediately then the water probably shorted out the SAM unit. This is just my opinion as I am not a professional Smart mechanic.