Airbag control unit with part number DF73-57K30-A

What does the airbag control unit DF73-57K30-A do?

The airbag control unit DF73-57K30-A controls the restraint system (SRS) in vehicles from Mazda. It evaluates the signals from the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners fire.

It also checks the other components of the system without interruption. If it detects a fault, the airbag warning light in the instrument cluster comes on. After an accident it records crash data and is locked afterwards.

Why does the control unit DF73-57K30-A fail?

The most common cause on the DF73-57K30-A is crash data from an accident, even if no airbag has deployed. Other causes are aged components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data of this kind cannot be erased with a normal diagnostic tool. Airbag24 erases it during the repair. The other causes at a glance:

• aged components in the electronics
• cold solder joints on the circuit board
• moisture and corrosion on the plugs
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the DF73-57K30-A is defective?

Typical signs of a defect on the DF73-57K30-A are the airbag warning light, fault messages in the instrument cluster, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared.

Watch for the following signs:

• The airbag warning light stays on permanently or intermittently.
• A fault message appears in the instrument cluster.
• The diagnostic tool finds no connection to the control unit.
• The fault memory cannot be cleared.

In this condition, airbags and seatbelt pretensioners may not deploy in an emergency. Have the finding checked promptly.

Which vehicles is the DF73-57K30-A fitted in?

The DF73-57K30-A is fitted in these vehicles: Mazda Mazda2 DE (2007-2010) and DE Facelift (2010-2014).

The models with this part number are shown in the following overview:

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

Compare the part number on the label of the removed device with this page. Then you know that you have the matching device; the comparison tells you nothing more. Also have the fault memory read out beforehand, because the log shows whether the control unit is defective or whether a plug or a 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 DF73-57K30-A work?

First you read out the fault memory and attach the log. Then you disconnect the battery and only afterwards remove the DF73-57K30-A. Processing at Airbag24, meaning checking, repairing and testing, usually takes 3–4 working days.

Afterwards create a repair order online and pack the device well for shipping. At Airbag24 it is examined on the test bench, defective components are replaced, the crash data is erased and a function test is carried out.

Afterwards your own device is returned to you. 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 DF73-57K30-A get to Airbag24?

You send the DF73-57K30-A as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends the device back by UPS.

Put the printed repair order into the parcel. Pack the control unit shockproof so that it survives transport undamaged.