Airbag control unit with part number GBFS-57K30A

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

The airbag control unit GBFS-57K30A controls the restraint system (SRS) in Mazda vehicles. It evaluates crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system at all times.

Faults are reported via the airbag warning light. Monitoring runs throughout every journey.

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

Why does the control unit GBFS-57K30A fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Airbag24 erases it during the repair. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data arises even from an impact that does not trigger any airbag. The unit records the event, even if the airbags remain untouched.

The remaining causes lie in the electronics themselves. Components age, solder joints can be cold, and moisture or corrosion attack the contacts. Voltage spikes arise, for example, with a weak battery or when connected to jump-start cables.

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

The airbag warning light in the instrument cluster indicates the defect when it lights up permanently or intermittently. Added to this may be an error message, a diagnostic tool without a connection to the control unit, or a fault memory that cannot be cleared. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the most direct indication the vehicle gives. After the ignition is switched on, it lights up briefly for a check and then goes out again.

If the light stays on or an error message appears, have the vehicle checked promptly.

Which vehicles is the GBFS-57K30A fitted in?

The assignment to this part number comes from the available data. The control unit GBFS-57K30A is fitted in these vehicles: Mazda Mazda6 GL 1st Facelift (2015-2018), GL 2nd Facelift (2018-2024), GL (2012-2025), GJ (2012-2015), GJ 2nd Facelift (2018-2024) and GJ 1st Facelift (2015-2018).

The list names the vehicles for which this unit is available.

• Mazda Mazda6 GL 1st Facelift (2015-2018)
• Mazda Mazda6 GL 2nd Facelift (2018-2024)
• Mazda Mazda6 GL (2012-2025)
• Mazda Mazda6 GJ (2012-2015)
• Mazda Mazda6 GJ 2nd Facelift (2018-2024)
• Mazda Mazda6 GJ 1st Facelift (2015-2018)

Compare the part number on the label of the removed unit with this page. This only ensures that you have the right unit in front of you. Also have the fault memory read out in advance, because only that result shows whether the control unit is defective or whether a plug or cable is behind it.

For the same vehicles, we also repair control units with the part numbers GBEF57K30B, GBFT-57K30A, GHP9-57K30A, GHR157K30, GHR157K30A.

How does the repair of the GBFS-57K30A work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit and create a repair order online. Processing at Airbag24 usually takes 3–4 working days, during which the unit is checked, repaired and tested.

The order is to be followed for safety reasons: battery before removal. Then pack the unit carefully and send it in.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test.

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 GBFS-57K30A get to Airbag24?

You send the control unit to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair it comes back to you by UPS.

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