Airbag control unit with part number DA6A-57K30A

What does the airbag control unit DA6A-57K30A do?

The airbag control unit DA6A-57K30A is the central control unit of the restraint system (SRS) for Mazda. It evaluates the crash sensors, decides in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system permanently. It reports faults via the airbag warning light.

The sensors continuously supply the unit with measured values. From these, it determines whether an impact is strong enough to activate the restraint devices.

After an accident, the unit stores crash data and locks itself. The lock affects the control unit itself.

The instrument cluster warning light tells you via the control unit whether the system is ready.

Why does the control unit DA6A-57K30A fail?

Crash data that remains stored after an accident is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot delete it. Further causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example with a weak battery or jump-starting.

The memory of the unit keeps the crash data until it is removed. A fault message can therefore appear even though the electronics themselves are in order. Airbag24 removes this data as part of the repair.

The other causes lie in the electronics and the connections. Aged components, cold solder joints, and moisture and corrosion at the plugs can impair function. Voltage spikes arise, for example, when the battery is weakening or jump-starting is carried out.

Which of these causes is actually present is shown by the examination on the test bench.

How can you tell that the DA6A-57K30A is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. With a defect, airbags and seatbelt pretensioners may fail to deploy in an emergency.

The airbag warning light in the instrument cluster lights up when the system detects a fault. Whether it lights up permanently or only intermittently is helpful for the first assessment.

In addition, a fault message may appear in the instrument cluster. If the diagnostic tool gets no connection to the control unit, or the fault memory persists despite an attempt to clear it, a check is advisable.

Which vehicles is the DA6A-57K30A fitted in?

The control unit DA6A-57K30A is fitted for Mazda in these vehicles: Mazda Mazda2 DJ (2014-2020), DJ 1st Facelift (2020-2023) and DJ 2nd Facelift (from 2023).

The vehicles that are recorded for this part number are listed here:

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

Compare the part number on the label of the removed unit with this page. This shows you that you have the right unit. Have the fault memory read out beforehand, because the log shows whether the control unit is defective or whether a connector or cable is the cause.

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

How does the repair of the DA6A-57K30A work?

Processing at Airbag24 usually takes 3–4 working days after the unit has been received. Beforehand, have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit and create the repair order online.

The procedure is fixed for safety reasons. The control unit may only be removed once the battery has been disconnected.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a functional test. Afterwards, your own unit goes back 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-57K30A get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Enclose the printed repair order in the parcel and pack the control unit shockproof.