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Starting with the 1999 model year, all GM vehicles had EDRs programmed to record about five seconds of pre-crash information. That included whether the driver was accelerating or braking and the speed of the vehicle, according to a study by the National Highway Traffic Safety Administration.
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While all vehicles with air bags use EDRs, other automakers have not been as quick to increase the amount of information recorded
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where company officials say they generally have limited capability on their EDR systems.
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its not a black box and shit like that. its actually inside the cars ecu on some cars and inside the body ecu on others. and dont let anyone lie to you, engineers can see so much shit that like i as a tech cannot see that its not even funny. and if they are at the shop working on a car, they will even ask you to leave them alone if they are in a sensitive area with their laptop. they can see stuff that would blow your mind to know. from emmissions to driving habits.