Airbag control unit with part number N452-57K30-C

What does the airbag control unit N452-57K30-C do?

For Mazda, the airbag control unit N452-57K30-C is the central control unit of the restraint system (SRS). It evaluates the crash sensors and, in an accident, decides within milliseconds whether airbags and seatbelt pretensioners are triggered. It also monitors the system continuously and shows faults via the airbag warning light.

While driving, the monitoring runs in the background. After an accident, the unit stores crash data and locks itself.

The signals from the sensors and triggers converge in the control unit, which is why it is central to the entire system.

Why does the control unit N452-57K30-C fail?

Stored crash data is the most common cause when the N452-57K30-C fails, even if no airbag was triggered. For this control unit, deleting the crash data is often not possible; if you want it deleted, contact Airbag24 briefly before sending the unit in, and Airbag24 will check the number. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is created after an accident and remains stored in the control unit, even if no airbag was triggered.

Aged electronic components, cold solder joints, and moisture and corrosion at plug connections belong to the other causes.

Voltage spikes, for example from a weak battery or a jump start, can also lead to a failure.

How can you tell that the N452-57K30-C is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when the N452-57K30-C has a defect. An error message in the instrument cluster, a missing connection of the diagnostic tool and a fault memory that cannot be cleared are added. In that case, airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light is the most visible sign you notice in everyday use.

Whether the fault lies in the control unit is shown by reading out the fault memory, not by looking at the light.

Which vehicles is the N452-57K30-C fitted in?

The N452-57K30-C is intended for Mazda. It is fitted in these vehicles: Mazda MX-5 ND (from 2015).

These vehicles are on record with us for the part number:

• Mazda MX-5 ND (from 2015)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Also have the fault memory read out beforehand; only this result 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 N452-57K30-C work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit N452-57K30-C; afterwards create a repair order online and send in the well-packed unit. Airbag24 checks it on the test bench, repairs defective components and carries out a function test, after which your own unit is returned. Processing at Airbag24 usually takes 3–4 working days.

The sequence serves safety.

If you want the crash data deleted, contact Airbag24 briefly before sending the unit in.

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 N452-57K30-C get to Airbag24?

You send the control unit N452-57K30-C in as a parcel, or book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair.

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