Airbag control unit with part number D09J-57K30C

What does the airbag control unit D09J-57K30C do?

The airbag control unit D09J-57K30C is the control centre of the restraint system (SRS) in Mazda. It processes the crash sensor data, determines in an accident which airbags and seatbelt pretensioners trigger, and indicates faults via the airbag warning light.

While driving, the unit monitors the system continuously and stores deviations in the fault memory.

After an accident, it stores crash data and locks itself.

Why does the control unit D09J-57K30C fail?

The most common cause is stored crash data after an accident, even if no airbag has been triggered. A normal diagnostic tool cannot erase this data. Other causes are aged electronics, cold solder joints, moisture at plugs and voltage spikes.

Crash data concern the unit itself and are therefore not a question of the wiring.

The other causes concern components, solder joints and connections. Which of them is present in an individual case is shown only by examining the control unit.

How can you tell that the D09J-57K30C is defective?

The airbag warning light lights up permanently or intermittently, and a fault message appears in the instrument cluster. In addition, there is no connection to the diagnostic tool, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The light indicates that a fault is present, so an inspection is advisable.

Which vehicles is the D09J-57K30C fitted in?

The assignment applies only to this part number. The airbag control unit D09J-57K30C is fitted in these vehicles: Mazda Mazda2 DE (2007-2010) and DE Facelift (2010-2014).

The affected vehicles are listed below.

• Mazda Mazda2 DE (2007-2010)
• Mazda Mazda2 DE Facelift (2010-2014)

Compare the part number on the label with this page. This only confirms that it is the right unit.

Have the fault memory read out before removal. Only the log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 2S6T-14B056-EN, DF73-57K30B, GC1M-57-K30.

How does the repair of the D09J-57K30C work?

First have the fault memory read out and attach the log, then disconnect the battery. Only then remove the control unit and create a repair order online. Afterwards, send the unit in, well packed.

Airbag24 inspects it on the test bench, replaces defective components, erases stored crash data and carries out a function test.

Processing at Airbag24 normally takes 3–4 working days.

Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit D09J-57K30C get to Airbag24?

You choose the route to Airbag24: a parcel, or a UPS collection for an extra charge. After the repair, the unit is returned by UPS.

Pack the control unit shock-resistant and include the printed repair order.