I heard a loud pop and the seat belt tightened while driving in slow speed. It seemed like I had an inadvertent activation of the SRS system (emergency tensioning retractor (ETR) in the seat belt). I assume this is the system that pulls the seat belt tight during an accident. Anyone on the board ever experience the same? Called a dealer and the Mercedes Regional office, they said car's too old and not under any type of warranty anymore, but isn't this a safety concern in light of recent Toyota recalls?

Any recommendation on where I should proceed?