EDR (Event Data Recorder) is an electronic system in a vehicle that records important vehicle parameters before, during, and after a crash event. It is often called the "Black Box" of a vehicle, similar to an aircraft flight recorder. The primary purpose of EDR is to help manufacturers, investigators, and regulatory agencies understand what happened during a crash and improve vehicle safety. Sensors ↓ Airbag ECU (RCM/ACM) ↓ EDR Memory ↓ Diagnostic Interface (CAN/UDS) ↓ Data Retrieval Tool Components Crash Sensors Accelerometers Pressure sensors Yaw rate sensors Airbag Control Module (ACM/RCM) Receives sensor inputs Determines crash severity Deploys airbags Stores EDR data Non-Volatile Memory Stores crash data permanently Diagnostic Interface CAN CAN FD UDS Services EDR Recording Process