I belive the SRS control module didn't start saving data until the
new generation of units came out in 99/2000.
Dealerships cannot access this info without the special recovery
tool. Mbusa does recover this data when it is claimed that the vehicle caused the accident. No brakes, sudden acceleration, ect...
The newest units store all kinds of good things like speed , rpm,
throttle %, brake application %, steering angle, vehicle yaw and
lateral acceleration, and so on.