Airbag control unit with part number GN3B 57 K30 A

What does the airbag control unit GN3B 57 K30 A do?

The airbag control unit GN3B 57 K30 A is the central control unit of the restraint system (SRS) for Mazda. It evaluates the signals from the crash sensors and, in the event of an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

The system is monitored constantly, and faults are reported via the airbag warning light in the instrument cluster.

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

Why does the control unit GN3B 57 K30 A fail?

The GN3B 57 K30 A most often fails because of crash data stored after an accident, even if no airbag has deployed. Other causes include aged components, cold solder joints, moisture and voltage spikes. With this control unit, deleting the crash data is often not possible; if you would like it deleted, please contact Airbag24 briefly before sending it in.

Aged electronic components can cause faults after prolonged operation, and cold solder joints lead to intermittent contact problems. Identical fault patterns can have different causes, so it is worth taking a close look before any action is taken.

Moisture and corrosion on plug connections disrupt the contact. Voltage spikes, for example from a weak battery or a jump start, can stress the electronics.

Only the evaluation of the fault memory shows whether one of these causes is present.

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

The airbag warning light in the instrument cluster indicates a defect in the GN3B 57 K30 A when it lights up permanently or intermittently. An error message in the instrument cluster also stands out; the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

Even an intermittent light indicates a fault. In an emergency, airbags and seatbelt pretensioners may then not deploy.

Which vehicles is the GN3B 57 K30 A fitted in?

The control unit GN3B 57 K30 A belongs to vehicles of the Mazda brand. It is fitted in these vehicles: Mazda Mazda6 GG (2002-2005) and GG Facelift (2005-2007).

The individual vehicles are shown in this list:

• 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 confirms that it is the correct unit. Also have the fault memory read out before you remove the unit. Only this shows whether the control unit is defective or a connector or cable is the cause. A defect cannot be confirmed before the fault memory has been read.

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 A work?

For the repair of the GN3B 57 K30 A, first have the fault memory read out and include the report in the parcel. Then disconnect the battery, remove the control unit, create a repair order online and send in the securely packed unit.

The order of the steps is there for safety.

Airbag24 checks the unit on the test bench, replaces defective components and carries out a function test. Then your own unit is returned to you.

If you would like the crash data deleted, please contact Airbag24 briefly before sending the unit in.

Processing at Airbag24 usually takes 3–4 working days.

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 A get to Airbag24?

You send the GN3B 57 K30 A as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit so that it is shockproof.