Airbag control unit with part number N452-57K30

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

As the central unit, the airbag control unit N452-57K30 controls the restraint system (SRS) of Mazda. It processes the signals from the crash sensors, decides in an accident on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. It shows faults via the airbag warning light.

After an accident the unit stores crash data and locks itself. The protective function of the airbags depends on this control unit working without faults.

Why does the control unit N452-57K30 fail?

Stored crash data from an accident is the most common cause with the control unit N452-57K30, even if no airbag has deployed. Other causes are aged components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool; Airbag24 erases it during the repair.

Aged electronic components and cold solder joints can cause intermittent faults. Moisture and corrosion mainly attack connector points, and voltage spikes arise, for example, from a weak battery or a jump start.

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

The airbag warning light in the instrument cluster stays on permanently or intermittently as soon as the system has detected a fault with the N452-57K30.

An error message may also appear in the instrument cluster. If the diagnostic tool cannot connect to the control unit, or the fault memory remains despite an attempt to erase it, this is likewise a sign of a defect.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. The warning light is therefore a warning signal that must be taken seriously.

Which vehicles is the N452-57K30 fitted in?

The control unit N452-57K30 is fitted in these vehicles: Mazda MX-5 ND (from 2015).

The vehicles are listed below:

• Mazda MX-5 ND (from 2015)

Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. First have the fault memory read out, because only this result shows whether the control unit is defective or whether a connector 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 N452-57K30 work?

First have the fault memory read out and attach the log, then disconnect the battery. Only then remove the control unit N452-57K30, create a repair order online and send in the well-packed unit. At Airbag24, processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out 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 N452-57K30 get to Airbag24?

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

The printed repair order goes into the parcel, and the unit must be packed shock-proof.