Airbag control unit with part number GN3A 57 K30

What does the airbag control unit GN3A 57 K30 do?

The airbag control unit GN3A 57 K30 is the central control unit of the restraint system (SRS) for Mazda. It evaluates the signals from the crash sensors and, in a crash, decides within milliseconds which airbags and seatbelt pretensioners are triggered. After a crash, it stores crash data and locks itself.

The unit monitors the entire restraint system continuously and reports any faults it detects via the airbag warning light in the instrument cluster.

A fault in this unit must be taken seriously, as it decides whether the restraint systems are triggered.

Why does the control unit GN3A 57 K30 fail?

Stored crash data is the most common cause with the GN3A 57 K30, even if no airbag has deployed, and a normal diagnostic tool cannot erase it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes. With this control unit, it is often not possible to erase the crash data; if you would like it erased, get in touch with Airbag24 briefly before sending the unit in, and Airbag24 will then check the number.

Aged electronic components and cold solder joints can cause faults that only appear after a longer period of operation.

Moisture and corrosion at plug connectors disrupt the contact. Voltage spikes, for example from a weak battery or a jump start, place additional strain on the electronics.

How can you tell that the GN3A 57 K30 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently if the GN3A 57 K30 is defective. In that case, the airbags and seatbelt pretensioners may not deploy in an actual crash.

An error message may also appear in the instrument cluster. The diagnostic tool then receives no connection to the control unit, and the fault memory cannot be cleared.

Take the warning light seriously, even if the vehicle drives normally. Only reading out the fault memory shows whether the control unit itself is the cause.

Which vehicles is the GN3A 57 K30 fitted in?

The control unit GN3A 57 K30 is fitted in these vehicles: Mazda Mazda6 GG (2002-2005) and GG Facelift (2005-2007). Whether your vehicle is among them is shown by comparing it with the list.

These vehicles are listed in detail:

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

Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. Also have the fault memory read out: only this shows whether the control unit is defective or whether a connector 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 GN3A 57 K30 work?

Before removing the GN3A 57 K30, have the fault memory read out and include the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components and carries out a functional test. Afterwards the unit is returned to you.

If you would like the crash data erased, get in touch with Airbag24 briefly before sending the unit in. 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 GN3A 57 K30 get to Airbag24?

You send the control unit GN3A 57 K30 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

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