Airbag control unit with part number KA0G-57K30A

What does the airbag control unit KA0G-57K30A do?

The airbag control unit KA0G-57K30A is the control unit of the restraint system (SRS) at Mazda. It processes the crash sensors, switches on the appropriate airbags and seatbelt pretensioners within milliseconds in a crash, and monitors the system continuously; faults appear on the airbag warning light.

It is in operation all the time, even when nothing happens in everyday use. After a crash it stores crash data and locks itself.

The lock is only lifted by a repair in which the data is erased.

Why does the control unit KA0G-57K30A fail?

Stored crash data is the most common cause of a failure. It stays in the unit even if no airbag has deployed, and an ordinary diagnostic tool does not erase it. Further causes are aged electronics, cold solder joints, moisture and corrosion, and voltage spikes.

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

At Airbag24 the crash data is erased as part of the repair.

How can you tell that the KA0G-57K30A is defective?

Faults show up mainly on the airbag warning light in the instrument cluster. The signs in detail:

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

In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Which vehicles is the KA0G-57K30A fitted in?

The KA0G-57K30A is fitted in these Mazda models: Mazda CX-5 KE (2011-2015) and KE Facelift (2015-2017).

Here are the vehicles:

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

Comparing the part number on the label of the removed unit with this page only shows that it is the correct unit. Have the fault memory read out beforehand, because only the result shows whether the control unit itself or 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 KA0G-57K30A work?

Processing at Airbag24 usually takes 3–4 working days. The KA0G-57K30A is then checked, repaired if necessary, and tested.

On the vehicle a binding order applies: first read out the fault memory with the log, then disconnect the battery, and only then remove the control unit. Afterwards you create a repair order online and send the unit in well packed.

Airbag24 erases the stored crash data, checks the components on the test bench and carries out a function test. Afterwards your own unit comes 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 KA0G-57K30A get to Airbag24?

You send the control unit KA0G-57K30A either as a parcel or book a UPS collection for an extra charge. Returns after the repair are handled by UPS.

Pack the unit shockproof and enclose the printed repair order.