Airbag control unit with part number GRT6-57K30

What does the airbag control unit GRT6-57K30 do?

As the central control unit of the SRS system of Mazda, the airbag control unit GRT6-57K30 evaluates the crash sensors. In a crash, it decides within milliseconds which airbags and seatbelt pretensioners trigger, and it monitors the entire system. After a crash, it stores crash data and locks itself.

Monitoring runs continuously while driving.

The unit displays detected faults via the airbag warning light in the instrument cluster.

Why does the control unit GRT6-57K30 fail?

The most common cause is that crash data was created in the unit GRT6-57K30 after an accident, even if no airbag deployed, and an ordinary diagnostic tool cannot erase it. Also possible are aged electronic components, cold solder joints, wetness and corrosion on plug connectors, and voltage spikes.

The crash data is stored because the unit records the accident event. It remains stored even if the vehicle continues to drive afterwards.

The other causes act over a longer period. Electronic components age, and plug connectors suffer from moisture and corrosion.

Voltage spikes, for example from a weak battery or when connecting a jump start, additionally strain the electronics. Cold solder joints can also play a role.

How can you tell that the GRT6-57K30 is defective?

You can recognise a defect on the control unit GRT6-57K30 by an airbag warning light that lights up intermittently or permanently. Accompanying signs can include a fault message, no connection to the diagnostic tool and a fault memory that cannot be erased. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

If the warning light comes on, have the fault memory read out instead of waiting.

A vehicle that otherwise behaves inconspicuously can also be affected by this warning.

Which vehicles is the GRT6-57K30 fitted in?

The control unit GRT6-57K30 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 assignment to the individual models is shown in the following list.

• 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)

A comparison of the part number on the label only confirms that the removed unit matches this page. Whether the control unit is really defective is shown only by the read-out fault memory log, because a plug or cable can equally be the cause.

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 GRT6-57K30 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit GRT6-57K30. Afterwards, create the repair order online and send in the well-packed unit. Airbag24 then checks it, repairs it and carries out a function test.

At Airbag24, the unit is first checked, then defective components are replaced, stored crash data is deleted and a function test is run. After that, your own unit is returned to you.

Processing at Airbag24 usually takes 3–4 working days. Follow this order, as the steps build on each other: read out first, then disconnect, then remove.

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 GRT6-57K30 get to Airbag24?

For shipping, you can either send the control unit GRT6-57K30 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

The printed repair order goes into the parcel, and the unit must be packed shock-resistant.