Airbag control unit with part number 28556 3XA5B

What does the airbag control unit 28556 3XA5B do?

The airbag control unit 28556 3XA5B bundles the signals of the restraint system (SRS) in Nissan. It evaluates the crash sensors and decides in an accident whether airbags and seatbelt pretensioners trigger. After an accident, it stores crash data and locks itself.

The evaluation runs in milliseconds. During operation the unit also monitors the wiring and the sensors continuously.

Faults are reported via the airbag warning light in the instrument cluster, so the condition of the system remains visible in the car.

Why does the control unit 28556 3XA5B fail?

On the control unit 28556 3XA5B, the most common cause is crash data from an accident, which may be present even when no airbag has deployed. In addition come ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

With the usual diagnostic tool these data cannot be reached, and Airbag24 removes them as part of the repair.

These further causes apply:

• electronic components that weaken over time
• cold solder joints
• moisture and corrosion at plugs
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the 28556 3XA5B is defective?

A defect in the 28556 3XA5B becomes noticeable mainly through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. An error message may be added, or the diagnostic tool cannot reach the control unit. In an emergency, airbags and seatbelt pretensioners may then not deploy.

A fault memory that cannot be cleared with the diagnostic tool is also among the signs. Especially when several signs appear at once, a check is the right next step.

Which vehicles is the 28556 3XA5B fitted in?

The control unit 28556 3XA5B is fitted in these vehicles: Nissan Frontier D23 (2015-2020); Nissan Navara D23 (2015-2020).

These models are listed in the following overview:

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

Comparing the part number on the label of the removed unit with this page only confirms that the unit fits. Having the fault memory read out beforehand 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 3XA5B work?

On the 28556 3XA5B, have the fault memory read out first and attach the log to the unit. Only then disconnect the battery and remove the control unit. Next, create the repair order online and send the unit off well packed.

The check takes place at Airbag24 on the test bench. Defective components are repaired, crash data is erased, and a function test follows. Processing usually takes 3–4 working days. The unit then returns 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 3XA5B get to Airbag24?

You send the 28556 3XA5B as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

Enclose the printed repair order with the parcel and pack the control unit in a shock-proof way.