Airbag control unit with part number 28556-3RN0A

What does the airbag control unit 28556-3RN0A do?

The airbag control unit 28556-3RN0A controls the restraint system (SRS) for Nissan. It evaluates the crash sensors and determines in a crash which airbags and seatbelt pretensioners are triggered.

The decision is made within a fraction of a second. At the same time, the unit checks the system for faults continuously.

It indicates faults via the airbag warning light in the instrument cluster. After an accident, it stores crash data and locks itself; only the repair lifts this lock.

Why does the control unit 28556-3RN0A fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Further causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. During the repair at Airbag24, it is erased.

The other causes lie in the electronics themselves or in the connections. Components age over time, solder joints can turn cold, and moisture or corrosion attack plug connections.

Voltage spikes occur, for example, with a weak battery or during a jump start. The test has to show which cause applies in each case.

How can you tell that the 28556-3RN0A is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently if the 28556-3RN0A has a fault. An error message may accompany it, the diagnostic tool finds no connection, or the fault memory cannot be cleared.

The warning light is the signal that shows the fault most quickly, and it is therefore a clear sign to have the finding checked.

A diagnostic tool that makes no contact with the control unit, or a fault memory that cannot be cleared, also indicates a malfunction.

As long as such a malfunction exists, airbags and seatbelt pretensioners may not trigger in an emergency. Therefore have the cause clarified promptly.

Which vehicles is the 28556-3RN0A fitted in?

The 28556-3RN0A is fitted in these vehicles: Nissan Sylphy B17 (from 2012).

You will find the vehicles we have on record for this part number here:

• Nissan Sylphy B17 (from 2012)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. Also have the fault memory read out in advance, because only this result shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 28556-3RN0A work?

The repair of the 28556-3RN0A begins with the fault memory: you have it read out, disconnect the battery and only then remove the control unit. At Airbag24, processing usually takes 3–4 working days.

Then create a repair order online, attach the log and pack the unit well for shipping.

Airbag24 tests the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Your own unit is then 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 28556-3RN0A get to Airbag24?

You ship the control unit 28556-3RN0A as a parcel, or have it collected by UPS for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel. Pack the unit shock-proof.