Airbag control unit with part number GMN3-57K30

What does the airbag control unit GMN3-57K30 do?

The airbag control unit GMN3-57K30 is the central control unit of the restraint system (SRS) in Mazda vehicles. It processes the measurements from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners within milliseconds in an accident.

During operation, the unit checks the entire system without interruption and reports faults via the airbag warning light.

After an accident it stores crash data and then locks itself.

Why does the control unit GMN3-57K30 fail?

The most common cause at the GMN3-57K30 is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool does not remove it. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data is kept in the memory, regardless of whether airbags were triggered.

Electronics age, solder joints can turn cold, and moisture promotes corrosion on the plugs.

How can you tell that the GMN3-57K30 is defective?

A defect on the GMN3-57K30 shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition, an error message appears in the instrument cluster, the diagnostic tool loses contact with the control unit, and the fault memory cannot be cleared.

Symptoms like these affect safety: airbags and seatbelt pretensioners may fail to trigger in an emergency, and you should take this seriously.

The warning light shows this state directly, so clarifying it quickly is worthwhile.

Which vehicles is the GMN3-57K30 fitted in?

The vehicle list on this page shows whether your car is included. The control unit GMN3-57K30 is fitted in these vehicles: Mazda CX-5 KE (2011-2015) and KE Facelift (2015-2017).

These vehicles are known to us with this part number:

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

Compare the number on the label of the removed unit with this page; this only ensures that you have the correct unit. Also have the fault memory read out. Only this result 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 GMN3-57K30 work?

First have the fault memory read out and attach the log. Then disconnect the battery and then remove the control unit GMN3-57K30.

Online, you create the repair order, then pack the unit well and send it in.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a functional test. Inspection, repair and testing at Airbag24 usually take 3–4 working days. 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 GMN3-57K30 get to Airbag24?

You send the control unit GMN3-57K30 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends your unit back to you by UPS.

The printed repair order goes into the parcel, and the unit should be packed securely against impact.