Airbag control unit with part number GN3B 57 K30

What does the airbag control unit GN3B 57 K30 do?

The airbag control unit GN3B 57 K30 controls the restraint system (SRS) for Mazda. It evaluates the signals from the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It reports faults via the airbag warning light.

After an accident, the unit stores crash data and locks itself.

The airbag warning light in the instrument cluster shows you when the system has detected a fault.

Why does the control unit GN3B 57 K30 fail?

Stored crash data are the most common cause, even if no airbag has triggered. With this control unit, deleting the crash data is often not possible; if you want it deleted, get in touch with Airbag24 briefly before sending the unit in, and Airbag24 will then check the part number. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The crash data remain stored in the unit after an accident, and a normal diagnostic tool cannot delete them. Repairing a fault is still possible as normal.

Aged electronic components and cold solder joints can cause failures even without an accident.

Moisture and corrosion on plug connections impair the contact. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

How can you tell that the GN3B 57 K30 is defective?

A defect shows up as an airbag warning light in the instrument cluster that stays on constantly or only intermittently. In addition, there may be a fault message in the instrument cluster, a missing connection of the diagnostic tool to the control unit GN3B 57 K30, or a fault memory that cannot be cleared.

If you notice any of these signs, airbags and seatbelt pretensioners may possibly not deploy in an emergency.

Therefore, have the system checked promptly.

Which vehicles is the GN3B 57 K30 fitted in?

The GN3B 57 K30 is fitted in these vehicles: Mazda Mazda6 GG (2002-2005) and GG Facelift (2005-2007). To check whether your car belongs, compare it with the models named.

The vehicles in detail:

• Mazda Mazda6 GG (2002-2005)
• Mazda Mazda6 GG Facelift (2005-2007)

These tips will help you. Compare the part number on the label of the removed unit with this page; the comparison only shows whether it is the correct unit. Have the fault memory read out beforehand, as only that shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 3326245, 5WK43763, 5WK43764, GJ6A57K30A, GS3L-57-K30, GSYL57K30.

How does the repair of the GN3B 57 K30 work?

First, have the fault memory read out and the log attached. Then disconnect the battery and only then remove the control unit GN3B 57 K30. Next, create a repair order online and send in the well-packed unit; Airbag24 checks it on the test bench, replaces defective components and runs a functional test.

For safety reasons, the sequence is mandatory: read-out, then disconnecting the battery, and finally the removal.

If you want the crash data deleted, get in touch with Airbag24 briefly before sending the unit in. Processing at Airbag24 usually takes 3–4 working days and covers checking, repairing and testing. After that, your own unit is 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 GN3B 57 K30 get to Airbag24?

You send the control unit GN3B 57 K30 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

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