Airbag control unit with part number DA6A 57K30 D

What is the function of the DA6A 57K30 D airbag control unit?

The airbag control unit with part number DA6A 57K30 D is the central control module of the occupant protection system in the Mazda Mazda2 DJ series (from 2014 onwards). It processes data from the acceleration sensors to precisely and promptly deploy the airbags and seatbelt pretensioners in the event of a crash, thereby protecting the occupants.

As the “brain” of the safety system, this control unit continuously monitors all connected components—from the impact sensors at the front and sides of the vehicle to the individual airbag modules and seatbelt pretensioners. It ensures that the entire system remains fully operational at all times and alerts the driver to any malfunctions via the SRS warning light on the instrument panel.

Specially designed for the Mazda2 DJ, it is precisely matched to the vehicle’s architecture and installed sensors, particularly in models equipped with the 1.5 SkyActiv-G engine. Its proper functioning is critical to the vehicle’s passive safety.

Why does the DA6A 57K30 D control unit fail?

The most common cause of failure for the DA6A 57K30 D control unit is the storage of crash data after an accident. Other defects arise from internal electronic faults, often triggered by moisture, excessive heat buildup, or pre-existing damage resulting from improper repair attempts.

Following an airbag deployment, the unit stores so‑called crash data. This data permanently locks the control unit to prevent reuse without professional diagnostics. This lock is a safety‑critical feature and can only be removed through specialized repair involving data erasure.

Electronic malfunctions are another frequent source of failure. External factors such as penetrating moisture can lead to corrosion on the circuit board, while heat buildup inside the vehicle may damage sensitive components like processors or memory chips. Such hardware issues often result in total failure or communication problems.

How do you recognize a defect in the DA6A 57K30 D?

A defect in the DA6A 57K30 D control unit typically manifests as a persistently illuminated airbag warning light (SRS lamp). Additionally, the unit may no longer communicate with diagnostic tools, or specific electrical malfunctions—such as a non‑functioning clock—may occur.

The primary symptom is the active SRS warning light in the cockpit, which indicates a fault in the restraint system and fails to extinguish even after restarting the vehicle.

Another clear sign is complete loss of communication: workshops cannot establish a connection between their diagnostic equipment and the airbag control unit, making fault diagnosis impossible. The unit becomes unreachable within the system.

In addition, very specific symptoms may appear, including a malfunctioning clock that worsens in warm conditions, or unusual behavior of the indicator lights when the ignition is turned on—where only the airbag light illuminates while the engine check light flashes.

Error codes stored in the fault memory, directly pointing to an internal control unit malfunction, confirm the diagnosis and isolate the defect from the rest of the system (sensors, airbags).

In which vehicles is the DA6A 57K30 D control unit installed?

The part number DA6A 57K30 D is specifically assigned to the airbag control unit of the Mazda Mazda2 DJ series. This covers all model years from 2014 to 2023, including facelifted versions. At Airbag24, we repair this control unit for the aforementioned model ranges, especially for models equipped with the 1.5 SkyActiv‑G engine.

At Airbag24, we service the DA6A 57K30 D control unit for the following models and series:

Mazda Mazda2 DJ (2014–2020) Mazda Mazda2 DJ First Facelift (2020–2023) Mazda Mazda2 DJ Second Facelift (from 2023)

Compatibility primarily extends to vehicles equipped with the 1.5 SkyActiv‑G engine producing 90 hp. Affected engine codes include P5Y6, P5Y5, P5Y8, P5X0, and P5X2 on chassis variants DJ6H5, DJ16H5, and DJ16HD.

How is the DA6A 57K30 D professionally repaired?

Professional repair at Airbag24 includes a comprehensive diagnosis, replacement of defective electronic components on the circuit board, and erasure of stored crash data. After restoration, the control unit undergoes testing to ensure full functionality and provide a plug-and-play solution.

Upon submission to Airbag24, repairs follow a proven procedure. First, the control unit undergoes an initial inspection to verify reported faults and identify additional potential weaknesses. This ensures not only that the immediate defect is resolved but also that its root cause is addressed.

Subsequently, the repair is performed at the component level. Our technicians replace defective parts such as memory chips, processors, or other electronic components. Stored crash data that locks the unit after an accident is completely and securely erased, restoring the device to its original factory‑ready condition.

Finally, each repaired control unit undergoes a comprehensive functional test. Only after passing all tests is the unit approved for return shipment. We provide 2 years' statutory liability for defects on every repair.