Airbag control unit with part number GW3L 57K30

What does the airbag control unit GW3L 57K30 do?

The central control unit of the restraint system (SRS) in Mazda is the airbag control unit GW3L 57K30. It reads the values from the crash sensors, determines within milliseconds of an impact which airbags and seatbelt pretensioners fire, and keeps constant watch over the system. As soon as a deviation occurs, the airbag warning light comes on; after an accident, the unit stores crash data and locks itself.

The unit continuously checks whether the sensors, airbags and seatbelt pretensioners are intact, correctly connected and functioning. If it detects a deviation, it writes this to the fault memory, which a diagnostic tool reads out later.

Because the protective effect depends on this decision, the control unit counts as a safety-critical component. Damage to it is therefore more than a display problem, because the restraint function itself is affected.

Why does the control unit GW3L 57K30 fail?

Crash data stored in memory after an accident is the most common cause with GW3L 57K30, even if no airbag has deployed; a standard diagnostic tool cannot erase it. Removing the crash data does not always work with this control unit; if you want it erased, contact Airbag24 briefly before sending the unit in, whereupon Airbag24 checks the part number. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at connectors, and voltage spikes (for example from a weak battery or jump-starting).

Crash data alone does not prove a fault inside the unit. For that, the fault memory has to be read out.

The other causes lie partly in the unit and partly in the wiring; the diagnosis separates the two.

How can you tell that the GW3L 57K30 is defective?

A fault can be recognised by the airbag warning light in the instrument cluster staying on permanently or intermittently, accompanied by a fault message in the instrument cluster. A lack of connection between the diagnostic tool and control unit GW3L 57K30 may also occur, as may a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

If this warning appears, take the vehicle for an inspection promptly.

Only a read-out with the diagnostic tool reveals what is stored in the fault memory, and that is what shows where the fault lies. The light itself does not reveal the affected component.

Which vehicles is the GW3L 57K30 fitted in?

Whether the unit fits your car is decided by the comparison. The airbag control unit GW3L 57K30 is fitted in these vehicles: Mazda CX-5 KF (2017-2021) and KF Facelift (from 2021). If your car matches this assignment, it should fit.

The following entries are stored with us:

• Mazda CX-5 KF (2017-2021)
• Mazda CX-5 KF Facelift (from 2021)

Compare the part number on the label of the removed unit with this page. This only establishes that it is the correct unit. Read out the fault memory beforehand; only the result shows whether the control unit itself is faulty or a cable or connector is the cause.

For the same vehicles, we also repair control units with the part numbers 0 285 014 556 Bosch, K123 57K K2 B, K123 57K30 A, K123 57K30 B, K123-57K30, K30F-57K30.

How does the repair of the GW3L 57K30 work?

First, the fault memory is read out and logged; then disconnect the battery and only afterwards remove the control unit GW3L 57K30. Next, create the repair order online and pack the unit well before sending it in. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the unit goes onto the test bench, defective components are replaced, and a functional test completes the work.

If you want the crash data erased, contact Airbag24 briefly before sending the unit in.

Afterwards 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 GW3L 57K30 get to Airbag24?

To get the unit to Airbag24, you can choose between sending a parcel and a UPS collection booked for an extra charge. The repaired control unit GW3L 57K30 comes back to you by UPS.

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