Airbag control unit with part number KV65-57K30

What does the airbag control unit KV65-57K30 do?

The airbag control unit KV65-57K30 is the central control unit of the restraint system (SRS) for Mazda. It evaluates the crash sensors, determines in a crash within milliseconds which airbags and seatbelt pretensioners are to be triggered, and monitors the system during operation.

In everyday use, the control unit works unnoticed in the background. That is exactly why its self-monitoring matters, because it detects deviations in sensors and wiring.

The control unit shows faults via the airbag warning light. After an accident, it stores crash data and locks itself; the lock is lifted only by the repair.

Why does the control unit KV65-57K30 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. In addition, ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes such as those from a weak battery or a jump start can cause the failure.

Crash data cannot be erased with a normal diagnostic tool. It therefore stays in the control unit until Airbag24 removes it during the repair.

Electronic components age over time, and solder joints on the circuit board can lose contact. Moisture and corrosion at plug connections also lead to faults.

Voltage spikes occur, for example, with a weak battery or when a jump start is connected. Such loads can impair the electronics.

How can you tell that the KV65-57K30 is defective?

Typical signs are an airbag warning light that stays on permanently or intermittently, an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The airbag warning light in the instrument cluster is where you notice a fault first. It shows that the restraint system has a fault.

If the fault memory cannot be cleared, the fault is still stored. A diagnostic tool without a connection points to a problem with the control unit or its connection.

Which vehicles is the KV65-57K30 fitted in?

The KV65-57K30 is fitted in these vehicles: Mazda CX-5 KE (2011-2015) and KE Facelift (2015-2017).

The list shows the vehicles stored for this part number.

• Mazda CX-5 KE (2011-2015)
• Mazda CX-5 KE Facelift (2015-2017)

Check the part number on the label of the removed unit against this page. This only confirms that it is the right unit. In addition, have the fault memory read out, because this result shows whether the control unit or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers KA1C-57-K30A, KA1C-57K30, KD45-57K30B, KEAD 57K30 C, KR2757K30A.

How does the repair of the KV65-57K30 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, remove the control unit, create a repair order online and send in the well-packed unit.

This order protects you when working on the airbag system, which is why the battery is always disconnected before removal.

Airbag24 tests the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Only then does your own unit go back to you. Processing at Airbag24 usually takes 3–4 working days.

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 KV65-57K30 get to Airbag24?

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

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