EDR (Event Data Recorder) / Crash Data – Function, Storage, Diagnosis, and FAQs

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EDR (Event Data Recorder) / Crash Data – Function, Storage, Diagnosis, and FAQs

The Event Data Recorder (EDR), commonly known as Crash Data, is a feature integrated into the Airbag Control Module (ACM/RCM/SDM/ORC) in many modern vehicles. It records important vehicle and crash information immediately before, during, and shortly after a collision. This information helps manufacturers, technicians, and investigators analyze crash events and diagnose SRS operation.

What Does EDR Stand For?

EDR = Event Data Recorder

Main Functions

  • Records crash event information.
  • Stores airbag deployment data.
  • Records seat belt usage status.
  • Logs vehicle speed and acceleration (vehicle dependent).
  • Stores SRS fault information.
  • Assists accident investigation and system diagnosis.

Typical Information Stored

  • Airbag deployment status.
  • Seat belt pretensioner activation.
  • Crash severity.
  • Vehicle speed before impact (if supported).
  • Brake pedal and throttle position (vehicle dependent).
  • Seat occupancy information.
  • Impact sensor data.
  • Diagnostic Trouble Codes (DTCs).

Simple Data Flow Diagram

 Impact Sensors
       │
       ▼
+----------------------+
| Airbag Control Module|
|    (EDR Memory)      |
+----------------------+
       │
       ▼
 Crash Data Storage
       │
       ▼
 Diagnostic Scan Tool

Common Symptoms After a Crash

  • Airbag warning light remains ON.
  • Crash event data stored.
  • SRS Diagnostic Trouble Codes present.
  • Airbag module locked after deployment (vehicle dependent).
  • Replacement or reprogramming may be required.

Possible Diagnostic Trouble Codes (DTCs)

  • B1000 – SRS Control Module Internal Fault
  • B1001 – Crash Event Stored
  • B1002 – Memory Error
  • U3000 – Control Module Internal Fault
  • Manufacturer-specific crash data DTCs

Diagnosis Tips

  • Read SRS fault codes using a professional scan tool.
  • Check whether crash event data has been stored.
  • Inspect all deployed airbags and pretensioners.
  • Follow manufacturer procedures before replacing or reprogramming the control module.
  • Verify communication with the SRS control module.

Important Note

Not all vehicles store the same amount of crash data. The information recorded, storage duration, and reset procedures vary by manufacturer, model, and local regulations. Some vehicles allow crash data to be cleared with specialized equipment, while others require replacement of the SRS control module after deployment.

Frequently Asked Questions

What is EDR?

The Event Data Recorder is an electronic memory that stores important vehicle and crash information during a collision.

Can crash data be erased?

It depends on the vehicle. Some SRS modules can be reset using specialized equipment, while others require replacement after airbag deployment.

Does every vehicle have an EDR?

Most modern vehicles are equipped with an Event Data Recorder, but the amount of stored information varies between manufacturers and models.

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