Airbag control unit with part number 28556-3RM0A

What does the airbag control unit 28556-3RM0A do?

The airbag control unit 28556-3RM0A works as the central control unit of the restraint system (SRS) for Nissan. It evaluates the crash sensors and decides in an accident, within milliseconds, on the triggering of airbags and seatbelt pretensioners.

During operation, it checks the system continuously. It indicates any faults it finds via the airbag warning light.

After an accident, it stores crash data and locks itself.

Why does the control unit 28556-3RM0A fail?

Most often the cause is crash data from an accident in which no airbag triggered; standard diagnostic tools do not delete this data. Other triggers are aged components, cold solder joints, moisture and corrosion on plugs, and voltage spikes.

Crash data stays stored until someone specifically removes it. Until then, the indication may remain.

Aging affects the electronics on the circuit board, and solder joints can go cold over time. A voltage surge, for example from a weak battery or jump-starting, can also cause damage.

How can you tell that the 28556-3RM0A is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. Joining it are a fault message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared.

As long as this is the case, airbags and seatbelt pretensioners may possibly not trigger in an emergency. A check is therefore advisable.

The warning light reports the defect itself as soon as the system recognises it.

Which vehicles is the 28556-3RM0A fitted in?

The 28556-3RM0A was fitted at Nissan in these vehicles: Nissan Sylphy B17 (from 2012).

The models are listed individually here:

• Nissan Sylphy B17 (from 2012)

Compare the part number on the label of the removed unit with this page to make sure you have the right unit. Whether the control unit itself is defective, or whether a plug or cable is causing the failure, is shown only by the read-out fault log.

How does the repair of the 28556-3RM0A work?

First have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit and create the repair order online. Processing at Airbag24 usually takes 3–4 working days.

The well-packed unit is then sent in. Airbag24 checks it on the test bench, replaces defective components, deletes the crash data and carries out a function test.

Afterwards your own unit is returned 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 28556-3RM0A get to Airbag24?

You send the unit as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

Enclose the printed repair order in the parcel. Pack the unit with attention to shock protection.