Airbag control unit with part number D10J-57K30A

What does the airbag control unit D10J-57K30A do?

The airbag control unit D10J-57K30A is the central component of the restraint system (SRS) of Mazda. It processes the signals from the crash sensors, selects the appropriate airbags and seatbelt pretensioners within milliseconds of an impact, and reports faults via the airbag warning light.

During operation the control unit continuously checks sensors, wiring and actuators, and every irregularity goes into the fault memory.

After an accident the unit stores crash data and locks itself.

Why does the control unit D10J-57K30A fail?

On the D10J-57K30A, crash data stored after an accident is the most common cause, even if no airbag has deployed. These cannot be erased with a normal diagnostic tool, but Airbag24 deletes them during the repair. Other causes may also come into consideration.

An accident without airbag deployment is therefore enough to leave data in the memory.

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

Only the examination shows which of these causes is present.

How can you tell that the D10J-57K30A is defective?

A defect in the D10J-57K30A can be recognised by the airbag warning light in the instrument cluster, which stays on permanently or intermittently. In addition there is a fault message when the diagnostic tool cannot establish a connection with the control unit.

A fault message in the instrument cluster appears at the same time, and the fault memory then cannot be cleared. That is the moment to act.

As long as the fault persists, airbags and seatbelt pretensioners may possibly not deploy in an emergency. Therefore do not ignore the warning light.

Which vehicles is the D10J-57K30A fitted in?

The control unit D10J-57K30A is fitted in these vehicles: Mazda CX-3 DK (from 2015). Whether your car is included is most easily determined by comparing the number on the label.

This selection belongs to the part number and is listed here:

• Mazda CX-3 DK (from 2015)

Hold the label of the removed unit next to this page, and you will see whether the numbers match. Have the fault memory read out before removal, because only this result shows whether the unit itself is defective or whether a cable or plug is the cause.

For the same vehicles, we also repair control units with the part numbers 0285 012 246, D10E-57-KM0C, D10E-57-KM0E, D10E-57-KM0G, D10J57K30, DB4F57K30A.

How does the repair of the D10J-57K30A work?

Have the fault memory of the D10J-57K30A read out and attach the log. Then disconnect the battery and remove the control unit. Next, create a repair order online and pack the unit well.

At Airbag24 the examination on the test bench comes first, followed by the repair of defective components and the function test, during which stored crash data is deleted. Processing at Airbag24 usually takes 3–4 working days.

Then you receive your own unit back.

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 D10J-57K30A get to Airbag24?

You can send the control unit D10J-57K30A as a parcel, or have it collected by UPS for an extra charge. The return after the repair is likewise by UPS. Put the printed repair order into the parcel and pack the unit shock-proof.

A box with padding protects the unit, and it is worth a look at the closure before dispatch.