Airbag control unit with part number DA6A-57K30B

What does the airbag control unit DA6A-57K30B do?

The airbag control unit DA6A-57K30B is the central unit of the SRS restraint system for Mazda. It processes the signals from the crash sensors, decides on airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the system continuously. After an accident it stores crash data and locks itself.

If it detects a fault, it activates the airbag warning light in the instrument cluster. This notice is direct feedback from the restraint system.

Why does the control unit DA6A-57K30B fail?

Crash data stored after an accident is the most common cause, even if no airbag was triggered. A normal diagnostic tool cannot delete it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, as well as voltage spikes.

Which component is affected is shown only by the investigation. Crash data alone does not give a finding on any particular component.

Aged electronic components and cold solder joints can cause a failure just as moisture and corrosion at the plugs can. Voltage spikes, for example from a weak battery or jump-starting, additionally strain the electronics.

How can you tell that the DA6A-57K30B is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. Accompanying this, a fault message may appear, the diagnostic tool does not find the control unit DA6A-57K30B, and the fault memory cannot be cleared.

The airbag warning light is the indicator you should watch first. If it stays on permanently or keeps coming back, that points to a fault that must not be ignored.

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

Which vehicles is the DA6A-57K30B fitted in?

Airbag24 has compiled the vehicles for which this part number is on record. The airbag control unit DA6A-57K30B is fitted in these vehicles: Mazda Mazda2 DJ (2014-2020), DJ 1st Facelift (2020-2023) and DJ 2nd Facelift (from 2023).

Here is the overview:

• Mazda Mazda2 DJ (2014-2020)
• Mazda Mazda2 DJ 1st Facelift (2020-2023)
• Mazda Mazda2 DJ 2nd Facelift (from 2023)

A comparison of the part number on the unit with this page only provides certainty that you have the correct control unit. Whether the control unit is defective or a plug or cable is the cause is clarified by the fault memory that you have read out in advance.

For the same vehicles, we also repair control units with the part numbers DA6A 57K30 D, DA7H57K30A.

How does the repair of the DA6A-57K30B work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit DA6A-57K30B. Next create a repair order online and send the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

In-house, the inspection is followed by repair of the defective components, then deletion of the crash data and finally a function test. Your own unit is then 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 DA6A-57K30B get to Airbag24?

You send the control unit DA6A-57K30B as a parcel, or alternatively you book a UPS collection for an extra charge. After the repair Airbag24 sends the unit back by UPS.

Insert the printed repair order into the parcel and pack the control unit so that it arrives shock-resistant.