Airbag control unit with part number D10E-57K30-A

What does the airbag control unit D10E-57K30-A do?

The airbag control unit D10E-57K30-A is the central control unit of the restraint system (SRS) of Mazda. It evaluates the signals from the crash sensors, decides in the event of an accident within milliseconds about airbags and seatbelt pretensioners, and monitors the entire system.

If the system detects a fault, it is shown via the airbag warning light in the instrument cluster.

After an accident, the unit stores crash data and locks itself. Only this fact belongs to the description; everything else follows in the section on repair.

Why does the control unit D10E-57K30-A fail?

Stored crash data after an accident is the most common cause, even if no airbag has been triggered; with a normal diagnostic tool it cannot be erased. Further causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Let us begin with the crash data, as it is the most frequent reason for a failure. The control unit records an accident, and this record remains even if no airbag was triggered.

The other causes arise over time or through environmental influences in the vehicle. Components age, solder joints can go cold, and moisture or corrosion impairs the plug connections.

Voltage spikes, for example from a weak battery or jump-starting, can also damage the circuitry.

How can you tell that the D10E-57K30-A is defective?

A defect in the D10E-57K30-A shows when the airbag warning light in the instrument cluster stays on permanently or intermittently. Also present may be a fault message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light shows the finding directly, so you should act on it straight away. It does not go out by itself while the fault persists.

If the fault memory cannot be cleared, the cause lies deeper than a simple contact fault. A specialist examination is then the right course.

Which vehicles is the D10E-57K30-A fitted in?

The D10E-57K30-A is fitted in these vehicles: Mazda CX-3 DK (from 2015). You can find out whether your car is included from the type details on the registration document.

You will find the affected vehicles in this overview:

• Mazda CX-3 DK (from 2015)

Before removal, two steps are important. (a) Comparing the part number on the label with this page only confirms the right unit. (b) Having the fault memory read out beforehand 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 0285 012 246, D10E-57-KM0C, D10E-57-KM0E, D10E-57-KM0G, D10J57K30, DB4F57K30A.

How does the repair of the D10E-57K30-A work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, remove the control unit, create the repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, the unit goes back to you.

For checking, repairing and testing at Airbag24, you should expect 3–4 working days. Your steps before sending have nothing to do with this time.

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 D10E-57K30-A get to Airbag24?

You send the control unit D10E-57K30-A as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

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