Airbag control unit with part number DA6A-57K30C

What does the airbag control unit DA6A-57K30C do?

The airbag control unit DA6A-57K30C is the central control unit of the restraint system (SRS) for Mazda. It evaluates the signals from the crash sensors, decides within milliseconds in the event of an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It shows faults via the airbag warning light.

The monitoring covers the sensors, the wiring and the output stages. Any deviations detected are stored in the fault memory.

After an accident, the unit stores crash data and locks itself. This state determines how the repair proceeds.

Why does the control unit DA6A-57K30C fail?

The most common cause is stored crash data after an accident, even without an airbag being triggered; a normal diagnostic tool cannot erase them. Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or jump-starting.

The crash data remain stored in the unit. A normal reading tool cannot get past this.

Ageing components and cold solder joints gradually impair the function. Moisture and corrosion at the plug connectors disrupt the signals.

Voltage spikes affect the electronics when the battery weakens or a jump start is connected.

How can you tell that the DA6A-57K30C is defective?

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

The warning light indicates the fault as soon as the system detects it. This also applies while driving.

A missing connection to the diagnostic tool, error messages and a fault memory that persists are additional signs of a problem with the control unit.

• Airbag warning light on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool without connection

Which vehicles is the DA6A-57K30C fitted in?

The airbag control unit DA6A-57K30C is fitted in these vehicles: Mazda Mazda2 DJ (2014-2020), DJ 1st Facelift (2020-2023) and DJ 2nd Facelift (from 2023). The list serves for comparison with your own vehicle.

The list of vehicles follows in the next line.

• 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 way you can confirm that it is the right unit. Have the fault memory read out beforehand, because 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 DA6A 57K30 D, DA7H57K30A.

How does the repair of the DA6A-57K30C work?

First have the fault memory read out, enclose the log and disconnect the battery. Then remove the control unit DA6A-57K30C, create a repair order online and send in the well-packed unit. Inspection, repair and function test at Airbag24 usually take 3–4 working days.

Airbag24 inspects the unit on the test bench and repairs defective components. Stored crash data are erased, followed by 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-57K30C get to Airbag24?

You send the unit in as a parcel or book UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Place the printed repair order in the parcel and pack the control unit shock-proof.