Airbag control unit with part number TK52-57K30A

What does the airbag control unit TK52-57K30A do?

The airbag control unit TK52-57K30A is the control centre of the restraint system for Mazda. It evaluates the crash sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors the entire system.

The control unit shows a detected fault via the airbag warning light in the instrument cluster. This lets the driver know that the restraint system is not in order.

After an accident, it stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit TK52-57K30A fail?

The most common cause is crash data that remains in the unit after an accident, even if no airbag was deployed. An ordinary diagnostic tool cannot erase it from the TK52-57K30A.

Airbag24 erases this crash data as part of the repair. No preparation on your side is needed for this.

The other causes are of a more general nature:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the TK52-57K30A is defective?

A defect in the TK52-57K30A can show up through the airbag warning light in the instrument cluster. Error messages, a diagnostic tool without a connection and a fault memory that cannot be cleared are further signs.

If the airbag warning light stays on permanently, that is a clear sign that the unit needs checking. Intermittent lighting is not a reason for reassurance either and should be taken seriously.

If there is no connection to the control unit, or the fault memory remains full despite a clearing attempt, the cause very probably lies in the control unit. Airbags and seatbelt pretensioners could then fail to deploy in a real emergency.

Which vehicles is the TK52-57K30A fitted in?

The control unit TK52-57K30A is fitted in these vehicles: Mazda CX-9 TC (2016-2020) and TC Facelift (2020-2023).

Below you will find the vehicles recorded for this part number. This selection does not release you from checking your vehicle, so compare equipment and year of manufacture.

• Mazda CX-9 TC (2016-2020)
• Mazda CX-9 TC Facelift (2020-2023)

Compare the part number on the label of the removed unit with this page. Have the fault memory read out beforehand, so that plugs and cables can be ruled out as the cause with certainty.

For the same vehicles, we also repair control units with the part numbers TD1157K30, TD1157K30C, TD1157K30D, TE6957K30A, TK48-57-K30B, TK4857K30C.

How does the repair of the TK52-57K30A work?

Before removal, you have the fault memory read out, disconnect the battery and remove the TK52-57K30A. Then you create a repair order online and send in the well-packed unit.

The log of the fault memory belongs in the parcel. Be sure to enclose it.

At Airbag24, the team checks the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test at the end. Processing usually takes 3–4 working days, and this time applies only to checking, repairing and testing.

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 TK52-57K30A get to Airbag24?

The control unit TK52-57K30A reaches Airbag24 either as a parcel or via a booked UPS collection for an extra charge. The return shipment is made by UPS as soon as the repair is complete.

Please enclose the printed repair order and pack the control unit shock-proof.