Airbag control unit with part number 28556-3AY1A

What does the airbag control unit 28556-3AY1A do?

The airbag control unit 28556-3AY1A coordinates the SRS restraint system of Nissan. It takes in the values from the crash sensors, decides within milliseconds of an impact which airbags and seatbelt pretensioners are triggered, and keeps the system under control.

Faults that occur are passed to the airbag warning light in the instrument cluster. After an accident, crash data is stored and the control unit locks itself.

Why does the control unit 28556-3AY1A fail?

Most often the cause lies in crash data from an earlier accident, even if no airbag was triggered on the 28556-3AY1A. Further causes are aged components, moisture at plug connections and voltage spikes.

Standard diagnostic equipment cannot reach these entries; Airbag24 deletes them during the repair.

The other causes at a glance:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery

How can you tell that the 28556-3AY1A is defective?

You can recognise a defect on the 28556-3AY1A by the airbag warning light in the instrument cluster lighting up permanently or intermittently. A fault message in the instrument cluster, a missing connection to the diagnostic tool, or a fault memory that cannot be cleared likewise point to a problem.

In an emergency, airbags and seatbelt pretensioners may then fail to trigger, so a prompt inspection appointment makes sense.

Which vehicles is the 28556-3AY1A fitted in?

Whether your car is included is shown by the list. The 28556-3AY1A is fitted in these vehicles: Nissan Almera N17 (2011-2020).

The models to which this number belongs:

• Nissan Almera N17 (2011-2020)

You compare the label with this page to confirm the right unit. Having the fault memory read out before removal, by contrast, shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 28556-9KN1B, 98820-9KA0A.

How does the repair of the 28556-3AY1A work?

First have the fault memory read out and enclose the log with the parcel. Then disconnect the battery and remove the control unit 28556-3AY1A. Next, create a repair order online and send the unit in. Work at Airbag24 generally takes 3–4 working days.

Airbag24 checks the electronics, repairs defective components, deletes the crash data and tests the system. Afterwards the unit 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 28556-3AY1A get to Airbag24?

The 28556-3AY1A leaves your household as a parcel or by UPS collection, which you book for an extra charge. The return journey after the repair runs via UPS.

A printout of the repair order goes with the parcel, and the packaging must be shockproof.