Airbag control unit with part number 28556-2FJ0A

What does the airbag control unit 28556-2FJ0A do?

The airbag control unit 28556-2FJ0A coordinates the restraint system (SRS) for Nissan. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

It also monitors the system continuously and reports faults via the airbag warning light in the instrument cluster. It is one of the safety-relevant control units in the vehicle, because it has to react without any loss of time in an emergency.

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

Why does the control unit 28556-2FJ0A fail?

Stored crash data is the most common cause of the 28556-2FJ0A failing, even if no airbag has deployed. Other causes include aged components, corrosion on plug connections and voltage spikes. With this control unit, deleting the crash data is often not possible; if you would like it deleted, please contact Airbag24 briefly before sending it in.

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

Only the evaluation of the fault memory shows whether one of these causes is present.

How can you tell that the 28556-2FJ0A is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when there is a fault in the 28556-2FJ0A. In addition, there is an error message in the instrument cluster, a diagnostic tool without a connection to the control unit, and a fault memory that cannot be cleared.

Even an intermittent light indicates a fault. In an emergency, airbags and seatbelt pretensioners may then not deploy. The indication relates to the entire restraint system and not just to a single airbag.

Which vehicles is the 28556-2FJ0A fitted in?

The control unit 28556-2FJ0A is a component for vehicles of the Nissan brand. It is fitted in these vehicles: Nissan Primera P11 (1996-1997), P11-120 (1997-1999) and P11-144 (1999-2002).

The individual vehicles are shown in this list:

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

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. If the numbers do not match, clarify this before sending the unit in. Also have the fault memory read out before you remove the unit. Only this shows whether the control unit is defective or a connector or cable is the cause. A defect cannot be confirmed before the fault memory has been read.

For the same vehicles, we also repair control units with the part numbers 285001188, 285001327, 285001329, 28556-2FL1A, 285562F200, 285562F400.

How does the repair of the 28556-2FJ0A work?

With the 28556-2FJ0A, first have the fault memory read out and include the report in the parcel. Then disconnect the battery, remove the control unit and create a repair order online. Afterwards, send in the securely packed unit.

The order of the steps is there for safety.

Airbag24 checks the unit on the test bench, replaces defective components and carries out a function test. Then your own unit is returned to you.

If you would like the crash data deleted, please contact Airbag24 briefly before sending the unit in.

Processing at Airbag24 usually takes 3–4 working days.

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 28556-2FJ0A get to Airbag24?

You send the 28556-2FJ0A as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit so that it is shockproof.