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

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

The airbag control unit NA2C-57K30-B is the central control unit of the restraint system (SRS) in Mazda vehicles. It processes the signals from the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners trigger. After an accident it stores crash data and locks itself.

The unit monitors the system continuously and reports faults via the airbag warning light.

The crash data document the course of an accident directly in the unit.

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

The most common cause is crash data stored after an accident, even if no airbag triggered; an ordinary diagnostic tool cannot erase it. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is also stored when no airbag triggers. An ordinary diagnostic tool cannot erase it.

Electronics age over time. Cold solder joints and corrosion at plug connections disrupt the contact, and voltage spikes, for example from a weak battery or jump-starting, stress the circuits.

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

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool gets no connection to the NA2C-57K30-B, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the clearest hint the vehicle gives, and it shows faults of the restraint system.

A diagnostic tool without a connection to the control unit is also a sign that something in the system is wrong.

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

The control unit NA2C-57K30-B is fitted in these vehicles: Mazda MX-5 ND (from 2015). If your car is in this list, the unit fits your vehicle.

In detail, we have these vehicles on record:

• Mazda MX-5 ND (from 2015)

Compare the part number on the label of the removed unit with this page; that only ensures it is the correct unit. Before removal, have the fault memory read out, 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 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-B work?

First have the fault memory of the NA2C-57K30-B read out and attach the log; then disconnect the battery and remove the control unit. Afterwards create a repair order online and send the well-packed unit. At Airbag24, testing, repair and function test usually take 3–4 working days.

This sequence is binding for safety reasons, so please keep to it.

At Airbag24 the unit is examined on the test bench, defective components are repaired or replaced, stored crash data is erased and a function test follows. Your own unit then 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 NA2C-57K30-B get to Airbag24?

You send the control unit NA2C-57K30-B as a parcel or book UPS collection for an extra charge. After repair Airbag24 returns it to you by UPS.

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