Airbag control unit with part number DJ01-57K30-A

What does the airbag control unit DJ01-57K30-A do?

The airbag control unit DJ01-57K30-A is the SRS control unit that coordinates the triggering of airbags and seatbelt pretensioners for Mazda. It evaluates the signals from the crash sensors and monitors the entire system.

In an impact the control unit reaches its decision within milliseconds. Outside an accident it checks the connected components continuously.

If a fault is detected, the airbag warning light in the instrument cluster shows it. After an accident the unit stores crash data and locks itself.

Why does the control unit DJ01-57K30-A fail?

The most common cause on the DJ01-57K30-A is stored crash data, which remains in the memory after an accident even without an airbag deploying. Other causes are ageing components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data cannot be removed with a normal diagnostic tool. The fault therefore stays visible until the repair eliminates the data.

The other causes concern the electronics and their connections. Ageing components, cold solder joints and moisture at the contacts disturb the signal, and voltage spikes, for example from a weak battery, put strain on the circuit.

How can you tell that the DJ01-57K30-A is defective?

A defect in the DJ01-57K30-A is recognised by the airbag warning light in the instrument cluster, which stays on permanently or intermittently, by fault messages there, and by a diagnostic tool without a connection. A fault memory that cannot be cleared also points to it.

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool receives no connection to the control unit
• fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may fail to deploy in an emergency. Take the warning light seriously and have it checked promptly.

Which vehicles is the DJ01-57K30-A fitted in?

The control unit DJ01-57K30-A is fitted in these vehicles: Mazda Mazda2 DE (2007-2010) and DE Facelift (2010-2014).

The list shows the vehicles that are recorded in the Airbag24 database for this part number.

• Mazda Mazda2 DE (2007-2010)
• Mazda Mazda2 DE Facelift (2010-2014)

Compare first the part number on the label of the removed unit with this page; that confirms you have the correct unit. Also have the fault memory read out, because this log shows whether the control unit is defective or whether a plug or cable is behind it.

For the same vehicles, we also repair control units with the part numbers 2S6T-14B056-EN, DF73-57K30B, GC1M-57-K30.

How does the repair of the DJ01-57K30-A work?

Have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the DJ01-57K30-A. Next, create the repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

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

The 3–4 working days cover only the checking, repairing and testing done at Airbag24.

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 DJ01-57K30-A get to Airbag24?

You send the control unit DJ01-57K30-A to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order goes into the parcel, and the unit must be packed shockproof.