The recording is made in a constant 5 second loop to normal RAM. As soon as an airbag deployment event (or "near deployment" - whatever that means) occurs that 5 seconds of RAM data is copied to non-volatile write-once RAM. That is why you need to replace your SDM (Sensing Diagnostic Module) after the air bags have been deployed.
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The recording is made in a constant 5 second loop to normal RAM. As soon as an airbag deployment event (or "near deployment" - whatever that means) occurs that 5 seconds of RAM data is copied to non-volatile write-once RAM. That is why you need to replace your SDM (Sensing Diagnostic Module) after the air bags have been deployed.