Airbag control unit with part number KD15-57K30

What does the airbag control unit KD15-57K30 do?

The airbag control unit KD15-57K30 is the central control unit of the restraint system for Mazda. It evaluates the crash sensors and in an accident decides within milliseconds which airbags and seatbelt pretensioners are triggered.

During operation it checks the system continuously and indicates faults via the airbag warning light. An accident causes the unit to store crash data and lock itself.

Why does the control unit KD15-57K30 fail?

Stored crash data is the most common cause of failure with the KD15-57K30, even if no airbag has deployed. Ageing components, cold solder joints, moisture at plug connections and voltage spikes are added to this.

A standard diagnostic tool cannot erase the crash data, so the fault remains. Airbag24 removes it as part of the repair. Voltage spikes arise, for example, with a weak battery or when jump-starting, while moisture and corrosion attack the plug connections.

How can you tell that the KD15-57K30 is defective?

A defect in the KD15-57K30 shows itself through the airbag warning light, an error message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then not deploy.

The signs in detail:

• Airbag warning light lights up permanently or intermittently
• Error message in the instrument cluster
• Missing connection to the diagnostic tool
• Fault memory cannot be cleared

Follow up the warning light rather than ignoring it. It is the warning of the system itself.

Which vehicles is the KD15-57K30 fitted in?

The KD15-57K30 is fitted in these vehicles: Mazda CX-5 KE (2011-2015) and KE Facelift (2015-2017).

The vehicle assignment is shown as a list below.

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

Match the number on the label of the removed unit with this page. That only ensures that you have the right unit. Have the fault memory read out beforehand, because this log alone shows whether the control unit itself is defective or whether a plug or cable is affected.

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 KD15-57K30 work?

Airbag24 needs 3–4 working days for processing. For the KD15-57K30, have the fault memory read out and attach the log, then disconnect the battery. Only then remove the control unit, create the repair order online and send in the well-packed unit.

The sequence is fixed for safety reasons and should be observed.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a functional test. After that, your own unit is returned. 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 KD15-57K30 get to Airbag24?

You send the control unit KD15-57K30 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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