Airbag control unit with part number N452-57K30B

What does the airbag control unit N452-57K30B do?

For Mazda, this airbag control unit N452-57K30B controls the restraint system (SRS). It reads the crash sensors, determines in fractions of a second in a crash which airbags and seatbelt pretensioners to trigger, and checks the system continuously. After an accident the unit stores crash data and locks itself.

The unit's messages run through the airbag warning light in the instrument cluster; the fault memory records faults that the control unit detects.

As long as there is no fault in the system, the unit stays inconspicuous and monitors the connections to sensors and seatbelt pretensioners.

Why does the control unit N452-57K30B fail?

For the N452-57K30B, crash data from an accident is the most common cause, even if no airbag was triggered. With this control unit, deleting the crash data is often not possible; if you want them deleted, get in touch with Airbag24 briefly before sending the unit, and Airbag24 will then check the number. Further causes are ageing electronic components, cold solder joints, moisture and corrosion, and voltage spikes.

The other causes at a glance:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the N452-57K30B is defective?

The airbag warning light in the instrument cluster is on permanently or intermittently. At the same time the instrument cluster shows a fault message for the N452-57K30B, and the diagnostic tool finds no connection to the control unit.

A fault memory that cannot be cleared also counts among these signs.

As long as the fault persists, airbags and seatbelt pretensioners may possibly not trigger in an emergency. Therefore take even an intermittent display seriously.

Which vehicles is the N452-57K30B fitted in?

The assignment lists these vehicles for N452-57K30B: Mazda MX-5 ND (from 2015).

The assignment is based on our information for this number:

• Mazda MX-5 ND (from 2015)

The easiest way to check is to compare the number on the label of the removed unit with this page. That only confirms the identity of the unit. Having the fault memory read out beforehand, on the other hand, shows whether the control unit is defective or whether a plug or a cable is to blame.

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 N452-57K30B work?

Reading out the fault memory with the enclosed log comes first, then disconnect the battery, and only then remove the control unit N452-57K30B. Then create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components and carries out a function test before your own unit is returned.

If you want the crash data deleted, get in touch with Airbag24 briefly before sending the unit.

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 N452-57K30B get to Airbag24?

The control unit N452-57K30B reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

The printed repair order belongs in the parcel, and the packaging should protect the unit against shocks.