Airbag Crash Data Reset

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Here's how to reset the airbag computer after a collision.

The airbag computer acts as a black box to a vehicle. After a major collision when the airbags are deployed, the airbag computer stores a hard code. The code stores information that can be used by investigators to tell vehicle speed, RPM, seat belt, pre-tensioner and accelerometer information.

If the vehicle is rebuilt, the airbag computer's crash data must then be replaced in order for the SRS system to function. The airbag light will stay solid and diagnostic software won't be able to read codes from the crashed computer.

This video describes an easier way to copy clean, non-crashed data to a crashed airbag computer, so it can be reused.

The airbag computer is typically located on the floor, in the middle of the dashboard. Removing it requires removing the lower half of the dash and console, and disconnecting the battery.

The EEPROM chip was programmed in circuit. 32 Gauge hookup wire was soldered to the SMD L56 EEPROM chip. The crystal has to be shorted out to be able to read and write in circuit. A home made EEPROM reader was connected to the serial port of the computer, and PonyProg was used to dump the HEX contents of the chip to the computer for analysis.

Virgin data from an SRS computer that has not had airbag deployment was copied onto the crashed computer chip. Once replaced in the vehicle, the airbag light will go out after 6 seconds as normal. Toyota's techstream software was used to ensure there were no active faults with the SRS system after clearing the EEPROM data.

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