Airbag control unit with part number GMN3-57K30A

What does the airbag control unit GMN3-57K30A do?

The airbag control unit GMN3-57K30A is the central control unit of the restraint system (SRS) for Mazda. It evaluates the signals from the crash sensors, decides within milliseconds in the event of an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The device indicates faults via the airbag warning light. Monitoring takes place throughout all driving operation.

After an accident it stores crash data and locks itself. This lock is only lifted by the repair.

Why does the control unit GMN3-57K30A fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other factors include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains stored in the control unit after the accident. Restarting the vehicle does not remove it. Airbag24 erases it specifically during the repair.

Aged components and cold solder joints affect the electronics on the circuit board. Moisture and corrosion attack the connectors, while voltage spikes from the vehicle electrical system place additional stress on the electronics.

How can you tell that the GMN3-57K30A is defective?

An airbag warning light that stays on permanently or lights up intermittently on the GMN3-57K30A is the most important sign. Other signs include fault messages in the instrument cluster, a missing connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

Both cases, the permanent light and the intermittent light, must be taken seriously. In both cases there is a fault in the restraint system, even if the vehicle otherwise behaves normally.

As long as the fault exists, airbags and seatbelt pretensioners may not deploy in an emergency. An early check brings clarity here.

Which vehicles is the GMN3-57K30A fitted in?

The control unit GMN3-57K30A is fitted in the following vehicles: Mazda CX-5 KE (2011-2015) and KE Facelift (2015-2017).

The list shows the vehicles for which we have this part number on record.

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

Compare the part number on the label of the removed device with this page. That only confirms that you have the right device in front of you. Also have the fault memory read out beforehand, because only this result shows whether the control unit 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 GMN3-57K30A work?

Processing at Airbag24 usually takes 3–4 working days. First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit GMN3-57K30A. Afterwards create a repair order online and send the device in well packed.

Airbag24 checks the device on the test bench, replaces defective components, erases the stored crash data and carries out a function test. The device is then returned 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 GMN3-57K30A get to Airbag24?

You send the device as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

Place the printed repair order in the parcel and pack the device shockproof.