Airbag control unit with part number K070-57K30

What does the airbag control unit K070-57K30 do?

The airbag control unit K070-57K30 forms the central control unit of the SRS for Mazda. It processes the measured values of the crash sensors, decides in the event of an accident within fractions of a second on the triggering of airbags and seatbelt pretensioners, and continuously checks the system function.

The unit shows faults in the system via the airbag warning light. A fault is therefore visible in the instrument cluster as soon as it occurs.

After an accident the control unit stores crash data and then locks itself. Both are part of the fixed sequence of the unit.

Why does the control unit K070-57K30 fail?

The most common cause on the K070-57K30 is crash data stored after an accident, even if no airbag has fired. A normal diagnostic tool cannot erase this data. In addition, ageing and wear of the electronics, as well as moisture, can cause a malfunction.

Airbag24 erases this data during the repair, because it can be erased.

The other causes include:

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

How can you tell that the K070-57K30 is defective?

On the K070-57K30, the airbag warning light in the instrument cluster lights permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool also finds no connection to the control unit, and the fault memory remains.

These signs concern the restraint system as a whole. In an emergency, airbags and seatbelt pretensioners may possibly not deploy.

A prompt check therefore makes sense, rather than waiting for the warning light to go out on its own.

Which vehicles is the K070-57K30 fitted in?

The control unit K070-57K30 is fitted in these vehicles: Mazda CX-5 KE (2011-2015) and KE Facelift (2015-2017).

The vehicles in detail:

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

Before removal, compare the part number on the label of the unit with this page. This only confirms that you have the correct unit. Have the fault memory read out beforehand as well, because only the log 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 KA1C-57-K30A, KA1C-57K30, KD45-57K30B, KEAD 57K30 C, KR2757K30A.

How does the repair of the K070-57K30 work?

First read out the fault memory, enclose the log and then disconnect the battery. Only then remove the control unit K070-57K30 and create a repair order online. Afterwards you send the well-packed unit.

Then Airbag24 takes over: the unit is examined on the test bench, defective components are repaired, the crash data is erased and a functional test is carried out. Airbag24 typically allows 3–4 working days for this.

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 K070-57K30 get to Airbag24?

You send the control unit K070-57K30 as a parcel to Airbag24 or book a UPS collection for an extra charge. After the repair it goes back to you by UPS.

The printed repair order goes into the parcel. Pack the unit shock-proof.