Airbag control unit with part number GM9A 57 K30

What does the airbag control unit GM9A 57 K30 do?

The airbag control unit GM9A 57 K30 is the central control unit of the restraint system (SRS) for Mazda. It evaluates the signals from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered. It monitors the system continuously and reports faults via the airbag warning light; after an accident, it stores crash data and locks itself.

In doing so, it keeps watch over the sensors, airbags, seatbelt pretensioners and the cable connections. If it detects a deviation, it stores it in the fault memory.

Because it has to react in fractions of a second in an emergency, it checks itself continuously.

Why does the control unit GM9A 57 K30 fail?

Stored crash data is the most common cause: it remains in the GM9A 57 K30 after an accident, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes. With this control unit, erasing the crash data is often not possible; if you want it erased, contact Airbag24 briefly before sending the unit in.

The other causes concern components and connections. Electronics can age, solder joints can be cold, and moisture with corrosion attacks plug connectors.

Which cause applies only becomes clear when the fault memory is checked.

How can you tell that the GM9A 57 K30 is defective?

On the GM9A 57 K30, a defect shows up as the airbag warning light on the instrument cluster lighting up permanently or intermittently. A fault message also appears on the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared.

If the control unit is affected, airbags and seatbelt pretensioners may not deploy in an emergency. If the warning light is on, have the system checked.

The warning light therefore shows a defect directly in the vehicle.

Which vehicles is the GM9A 57 K30 fitted in?

A control unit is only fitted in certain vehicles. The GM9A 57 K30 is fitted in these vehicles: Mazda Mazda6 GG (2002-2005) and GG Facelift (2005-2007).

Here are the vehicles in detail:

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

To compare, proceed as follows: first 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 beforehand, because 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 GM9A 57 K30 work?

For safety reasons, first have the fault memory read out and attach the log, before you disconnect the battery and only then remove control unit GM9A 57 K30. Then 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 the faults in the affected components and carries out a function test. Afterwards, your own, repaired unit is returned to you.

If you want the crash data erased, contact 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 GM9A 57 K30 get to Airbag24?

You send control unit GM9A 57 K30 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns your unit by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.