Airbag control unit with part number 28556 8Z300

What does the airbag control unit 28556 8Z300 do?

The airbag control unit 28556 8Z300 is the central control unit of the restraint system (SRS) at Nissan. It evaluates the signals of the crash sensors and decides in a collision, within milliseconds, which airbags and seatbelt pretensioners are triggered. It also monitors the system continuously and indicates faults via the airbag warning light.

During normal driving the unit works unnoticed in the background. It checks the connections to the sensors and to the trigger units, so that the system is ready for use in an emergency.

After an accident the unit stores crash data and locks itself. This behaviour is part of how the system works and part of its safety architecture.

Why does the control unit 28556 8Z300 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. Further causes are aging electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

A normal diagnostic tool cannot erase crash data. During the repair at Airbag24 it is erased before the unit leaves the test bench.

The other causes develop gradually, because components age and connections slowly corrode. Voltage spikes additionally stress the electronics whenever the battery is weak or a vehicle is started with jump leads.

How can you tell that the 28556 8Z300 is defective?

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

• Airbag warning light lights up permanently or intermittently
• Error message in the instrument cluster
• No connection of the diagnostic tool to the control unit
• Fault memory cannot be erased

If one of these signs appears, airbags and seatbelt pretensioners may not trigger in an emergency. Therefore have the condition checked promptly.

Which vehicles is the 28556 8Z300 fitted in?

The 28556 8Z300 is fitted in these vehicles: Nissan Frontier D23 (2015-2020); Nissan Navara D23 (2015-2020).

The following vehicles are assigned to this part number:

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

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Whether the control unit is defective or a connector or cable is the cause is shown only by reading out the fault memory, which you should have done before removal.

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 8Z300 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the 28556 8Z300 only afterwards, and create a repair order online. Testing, repair and function test at Airbag24 take 3–4 working days as a rule.

Then pack the unit well and send it in. Airbag24 checks it on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards your own unit goes back to you.

The order of steps serves safety during removal.

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 8Z300 get to Airbag24?

You send the unit as a package or book a UPS collection for an extra charge. Put the printed repair order into the package and pack the unit shock-resistant.

After the repair, Airbag24 returns your own unit via UPS.