Airbag control unit with part number KEAD-57K30

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

The airbag control unit KEAD-57K30 is the central control unit of the restraint system (SRS) in Mazda. It evaluates the signals from the crash sensors and, in the event of a crash, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

At the same time, it continuously checks the system for faults, which are shown via the airbag warning light in the instrument cluster.

If an accident occurs, the control unit records crash data and then locks itself.

Why does the control unit KEAD-57K30 fail?

The most common cause for the control unit KEAD-57K30 is crash data stored after an accident, even if no airbag has deployed. A standard diagnostic tool cannot erase it. Other causes are aged components, cold solder joints, moisture and corrosion, and voltage spikes.

Stored crash data also arises when no airbag has been triggered, and reading it out with an ordinary tool does not remove it.

The other causes build up over a longer period: components age, solder joints can go cold, and moisture and corrosion attack the plug connections. Voltage spikes occur, for example, from a weak battery or a jump start.

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

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the instrument cluster. The diagnostic tool cannot connect to the control unit KEAD-57K30, and the fault memory cannot be cleared.

The signs at a glance:

• The warning light in the instrument cluster lights up permanently or intermittently.
• An error message appears.
• 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 not trigger. In this case, have the system checked promptly.

Which vehicles is the KEAD-57K30 fitted in?

The control unit KEAD-57K30 is fitted in these vehicles: Mazda CX-5 KE (2011-2015) and KE Facelift (2015-2017). The comparison with the label on the unit shows which version suits your car.

Here is the breakdown of the assignment:

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

Matching the part number on the removed unit with this page only ensures that it is the right unit. Have the fault memory read out before removal. Only this result shows whether the control unit itself is defective or whether a plug or a 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 KEAD-57K30 work?

First, have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit KEAD-57K30. Next, create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The unit then goes back to you. Processing at Airbag24 usually takes 3–4 working days.

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 KEAD-57K30 get to Airbag24?

You can send the control unit KEAD-57K30 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

Include the printed repair order in the parcel and pack the unit shock-proof.