Airbag control unit with part number 28556-4KK0B

What does the airbag control unit 28556-4KK0B do?

The airbag control unit 28556-4KK0B controls the SRS restraint system of Nissan. It reads the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners fire, and reports faults via the airbag warning light.

In normal operation, it runs in the background and checks the system continuously.

After an accident, it stores crash data and locks itself. The lock is lifted exclusively by the repair.

Why does the control unit 28556-4KK0B fail?

The most common cause lies in stored crash data that remains in the unit after an accident, even without a deployed airbag, and that a standard diagnostic tool cannot erase. In addition come aged electronics, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

Airbag24 removes the crash data during the repair.

Aged electronics, cold solder joints, moisture and corrosion are things that develop over time. Voltage spikes, by contrast, occur suddenly, for example with a weak battery or when a jump start is used.

How can you tell that the 28556-4KK0B is defective?

In the vehicle, the defect is first noticed at the airbag warning light in the instrument cluster, which may light up permanently or intermittently. A fault message likewise appears in the instrument cluster.

If the diagnostic tool does not connect to the control unit, or the fault memory cannot be cleared, there is a problem that must be taken seriously.

In an emergency, airbags and seatbelt pretensioners may then not deploy.

Which vehicles is the 28556-4KK0B fitted in?

The 28556-4KK0B is fitted in Nissan vehicles of this type: Nissan Frontier D23 (2015-2020); Nissan Navara D23 (2015-2020).

The vehicles in detail:

• Nissan Frontier D23 (2015-2020)
• Nissan Navara D23 (2015-2020)

Compare the part number on the label of the removed unit with this page; that only confirms it is the correct unit. Only a fault memory read-out carried out beforehand shows whether the control unit itself is affected or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 0 285 015 304, 28556-8Z325, 285569Z510, 28556EA10A, 98820 6KB0A, 98820 EB01D.

How does the repair of the 28556-4KK0B work?

At the beginning, the fault memory is read out, and its report is enclosed with the unit. Only after that disconnect the battery and remove the 28556-4KK0B. Next, create the repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. Processing 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 28556-4KK0B get to Airbag24?

The control unit 28556-4KK0B reaches Airbag24 by parcel or by a UPS collection booked for an extra charge. The return journey is handled by UPS afterwards.

Pack it shock-resistant and enclose the printed repair order.