Airbag control unit with part number K070-57K30A

What does the airbag control unit K070-57K30A do?

The airbag control unit K070-57K30A is the central control unit of the restraint system for Mazda. It measures through the crash sensors what happens in an accident and decides within milliseconds on airbags and seatbelt pretensioners.

In addition, it monitors the system continuously. Faults appear on the airbag warning light in the instrument cluster.

After an accident, the unit records crash data and locks itself. The lock is lifted only by a repair.

Why does the control unit K070-57K30A fail?

The K070-57K30A most often fails because of crash data stored after an accident, even if no airbag has deployed. A standard diagnostic tool does not erase this data.

This crash data stays in memory and keeps fault messages active. The cause then lies not in the behaviour of the electronics, but in the stored event.

Only after that does the question of other triggers arise. Aged components, cold solder joints, moisture and corrosion at the plug connections, and voltage spikes also play a role.

How can you tell that the K070-57K30A is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, error messages appear in the instrument cluster, the diagnostic tool finds no connection to the control unit K070-57K30A, and the fault memory cannot be cleared.

A brief flash when the ignition is switched on is normal. If the light stays on or flickers, this points to a fault.

Until the fault has been clarified, airbags and seatbelt pretensioners may fail to deploy in an emergency.

Which vehicles is the K070-57K30A fitted in?

The list is based on the part number for Mazda. The control unit is fitted in these vehicles: Mazda CX-5 KE (2011-2015) and KE Facelift (2015-2017).

The decisive factor is the number on the label, not the look of the housing.

The assigned models:

• Mazda CX-5 KE (2011-2015)
• Mazda CX-5 KE Facelift (2015-2017)

Have the fault memory read out before removal. Afterwards compare the part number on the removed unit with your details, so that it is clear whether the control unit or a plug is causing the fault.

For the same vehicles, we also repair control units with the part numbers KA1C-57-K30A, KA1C-57K30, KD45-57K30B, KEAD 57K30 C, KR2757K30A.

How does the repair of the K070-57K30A work?

Processing at Airbag24 for the K070-57K30A usually takes 3–4 working days. Reading out the fault memory, removing the unit and creating the repair order are your tasks beforehand.

Attach the protocol to the control unit and disconnect the battery before removing it. Create the repair order online and pack the unit carefully.

Airbag24 checks the unit, repairs defective components, deletes the crash data and carries out a function test. Your own unit then goes back 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 K070-57K30A get to Airbag24?

You send the control unit K070-57K30A as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

Place the printed repair order in the parcel and pack the unit shock-resistant.