Airbag control unit with part number 28556-4KH0B

What does the airbag control unit 28556-4KH0B do?

The airbag control unit 28556-4KH0B coordinates the restraint system (SRS) in Nissan vehicles. It processes the readings from the crash sensors, decides on triggering airbags and seatbelt pretensioners in an impact within milliseconds, and checks the system continuously for faults.

If it detects a fault, it switches on the airbag warning light in the instrument cluster and records an entry in the fault memory. This makes a fault visible as soon as the system detects it.

This storage after an accident is a basic function of the unit: it stores crash data and locks itself afterwards.

Why does the control unit 28556-4KH0B fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Added to this are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example with a weak battery or a jump start.

Crash data cannot be cleared with an ordinary diagnostic tool, so the message remains. Airbag24 removes the crash data during the repair.

The other causes mainly concern electronics and connections that age over years and are exposed to moisture. Solder joints can lose contact over time, plug connections corrode, and voltage spikes put additional strain on the electronics.

How can you tell that the 28556-4KH0B is defective?

The airbag warning light in the instrument cluster lights up permanently or flickers intermittently, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

These signs may indicate that airbags and seatbelt pretensioners may not be able to deploy in an emergency.

Have the vehicle checked promptly as soon as the light comes on.

Which vehicles is the 28556-4KH0B fitted in?

The 28556-4KH0B is fitted in these vehicles: Nissan Frontier D23 (2015-2020); Nissan Navara D23 (2015-2020).

The overview contains the vehicles recorded for this part number.

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

(a) Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. (b) Have the fault memory read out before you remove anything. Only the result shows whether the control unit is defective or whether a plug 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 28556-4KH0B work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit, create the repair order online and send the unit in well packed. At Airbag24, checking, repairing and the function test usually take 3–4 working days.

This sequence is binding for your safety.

Airbag24 checks the control unit on the test bench, repairs defective components, clears stored crash data and carries out a function test. Your own unit then goes back 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 28556-4KH0B get to Airbag24?

You can send the control unit 28556-4KH0B in by parcel, or have it collected by UPS for an extra charge. Airbag24 sends it back to you by UPS after the repair.

Enclose the printed repair order and pack the unit shock-resistant.