Airbag control unit with part number KD35-57K30D

What does the airbag control unit KD35-57K30D do?

The airbag control unit KD35-57K30D controls the SRS restraint system in Mazda vehicles. On the basis of the crash sensors, it decides in an accident, within milliseconds, whether the airbags and seatbelt pretensioners are triggered.

Outside of accidents, monitoring runs without interruption. The unit reports every detected fault via the airbag warning light in the instrument cluster.

In an accident it writes crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit KD35-57K30D fail?

Crash data from an earlier accident is the most common trigger of a failure, even without an airbag having deployed. Aged electronic components, cold solder joints, moisture or corrosion at plugs, and voltage spikes, for example from a weak battery or jump-starting, can also be involved.

These crash data cannot be removed with a usual diagnostic tool. Airbag24 takes over this erasure as part of the repair.

How strongly the other factors are involved only becomes clear from the test.

How can you tell that the KD35-57K30D is defective?

The airbag warning light in the instrument cluster stays on permanently or comes on intermittently. A fault message also appears, the diagnostic tool does not find the control unit, and the fault memory cannot be cleared.

Especially important: in an emergency, the airbags and seatbelt pretensioners may not deploy. Do not wait before having it checked.

Which vehicles is the KD35-57K30D fitted in?

The KD35-57K30D is fitted in these vehicles: Mazda CX-5 KE (2011-2015) and KE Facelift (2015-2017).

You will find the models and years of construction for which the unit is intended in the overview:

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

Compare the part number on the unit with this page. Only then is it certain that you have the matching unit. Please have the fault memory read out before removal, because only it reveals whether the control unit itself is affected or whether plugs and cables are.

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 KD35-57K30D work?

First read out the fault memory and enclose the log. Then disconnect the battery and then remove the control unit KD35-57K30D. After that, create the repair order online and pack the unit carefully for shipping.

Airbag24 checks the unit on a test bench, replaces damaged components, removes the crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days. You then receive your own unit 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 KD35-57K30D get to Airbag24?

You can send a parcel yourself to Airbag24, or book a UPS collection for KD35-57K30D for an extra charge. After the repair, Airbag24 sends the control unit back by UPS.

Enclose the printed repair order with the parcel, and pack the unit shock-proof.