Airbag control unit with part number NA2C-57K30-A

What does the airbag control unit NA2C-57K30-A do?

The airbag control unit NA2C-57K30-A is the central control unit of the restraint system (SRS) for Mazda. It evaluates the signals from the crash sensors, decides in an accident which airbags and seatbelt pretensioners fire, and monitors the system continuously.

The monitoring covers the sensors, the wiring and the output stages. If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and locks itself. The storage concerns the course of the incident and remains in the unit.

Why does the control unit NA2C-57K30-A fail?

Most often, crash data stored after an accident leads to the fault, even when no airbag has deployed; a normal diagnostic tool cannot erase it. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example with a weak battery or jump-starting.

The crash data remain in the unit even if the vehicle continues to run inconspicuously after the incident. A fault can therefore persist that cannot be seen on the vehicle.

The other causes concern the technology itself. Electronic components age, solder joints can crack, and moisture or corrosion worsen plug connections. Voltage spikes from the on-board network add to this. Airbag24 erases the stored crash data during the repair.

How can you tell that the NA2C-57K30-A is defective?

Typical signs are an airbag warning light that lights up constantly or intermittently, a fault message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared.

• Airbag warning light is on constantly
• Airbag warning light is on intermittently
• Fault message in the instrument cluster
• No connection to the diagnostic tool
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not be able to deploy if a defect is present. Therefore have such signs checked promptly.

Only reading out the fault memory shows whether the control unit itself is defective.

Which vehicles is the NA2C-57K30-A fitted in?

The details refer to Mazda vehicles with this control unit. The airbag control unit NA2C-57K30-A is fitted in these vehicles: Mazda MX-5 ND (from 2015).

This list shows the vehicles for which the same part number is recorded with us:

• Mazda MX-5 ND (from 2015)

Compare the part number on the unit's label with this page so that you can be sure you have the correct unit. Have the fault memory read out in addition beforehand, because only that 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 0 285 014 161 Bosch, N243 57K K2 C, N243 57K30 A, N243 57K30 C, N243 57K30 D, N243-57-K30G.

How does the repair of the NA2C-57K30-A work?

For your NA2C-57K30-A, you begin with reading out the fault memory, and you enclose the log. After disconnecting the battery you remove the control unit. Testing, repairing and checking at Airbag24 usually take 3–4 working days.

Only then do you create the repair order online and send the unit in, carefully packed. Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Then your own unit returns 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 NA2C-57K30-A get to Airbag24?

You send the control unit NA2C-57K30-A off yourself as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

Put the printed repair order into the parcel and pack the control unit shockproof.