Airbag control unit with part number 28556-2FL1A

What does the airbag control unit 28556-2FL1A do?

The airbag control unit 28556-2FL1A coordinates the restraint system (SRS) at Nissan: it checks the crash sensors, selects the appropriate airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the system without interruption. Reported faults are shown via the airbag warning light.

After an accident the unit stores crash data and then locks itself. Only the repair releases the lock.

Sensor data is evaluated during operation without pause. This covers sensors, wiring, plug connections and the activation of the triggers. If the unit detects a deviation, it stores a fault entry.

Why does the control unit 28556-2FL1A fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered; a normal diagnostic tool cannot delete it. Further causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data remains stored in the unit until Airbag24 removes it during the repair. A usual diagnostic tool cannot clear it.

The other causes concern the electronics and their connections. Components age, solder joints can stay cold, and moisture attacks plug connections. Voltage spikes, for example from a weak battery or when connecting a jump start, additionally load the unit.

How can you tell that the 28556-2FL1A is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool gets no connection to the 28556-2FL1A, and the fault memory cannot be cleared; this points to a defect.

As a result, airbags and seatbelt pretensioners may possibly not trigger in an emergency. For that reason a warning like this should be taken seriously, even if the vehicle otherwise appears unremarkable.

Reading out the fault memory helps to narrow down where the fault comes from.

Which vehicles is the 28556-2FL1A fitted in?

The 28556-2FL1A is fitted in these vehicles: Nissan Primera P11 (1996-1997), P11-120 (1997-1999) and P11-144 (1999-2002).

The overview lists the vehicles to which this part number is recorded with us:

• Nissan Primera P11 (1996-1997)
• Nissan Primera P11-120 (1997-1999)
• Nissan Primera P11-144 (1999-2002)

Before shipping, compare the part number on the label of the unit with this page so you know you have the right unit. Whether the control unit is defective or a plug or cable is the cause is determined only by the fault memory that you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 285001188, 285001327, 285001329, 285562F200, 285562F400, 285567J600.

How does the repair of the 28556-2FL1A work?

Airbag24 needs 3–4 working days as a rule for testing, repairing and function testing. Beforehand, read out the fault memory and enclose the log, then disconnect the battery; only then remove the unit. Afterwards create the repair order online and send in the unit well packed.

At Airbag24 the unit is first checked on the test bench. Defective components are replaced, the stored crash data is deleted, and a function test is carried out. 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 28556-2FL1A get to Airbag24?

The control unit 28556-2FL1A reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair it goes back to you by UPS.

Enclose the printed repair order and pack the unit shock-resistant.