Airbag control unit with part number 28556 JX02A

What does the airbag control unit 28556 JX02A do?

The airbag control unit 28556 JX02A is the central control unit of the restraint system (SRS) in Nissan. It evaluates the signals from the crash sensors and, in a crash, decides within milliseconds which airbags and seatbelt pretensioners are triggered. It reports faults via the airbag warning light; after a crash, it stores crash data and locks itself.

While the vehicle is being driven, the unit monitors the entire system without a break. It checks sensors, wiring and output stages and records every fault it detects in the fault memory.

As long as everything is in order, the warning light stays dark. Only a fault makes it light up.

Why does the control unit 28556 JX02A fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or a jump start, are also possible causes.

Crash data is a record that the unit creates after an impact. A standard diagnostic tool cannot erase it. Airbag24 erases it as part of the repair.

The other causes work over time and through the environment. Electronic components age, cold solder joints can become unreliable, and moisture together with corrosion attacks plug contacts. Voltage spikes put additional strain on the electronics.

How can you tell that the 28556 JX02A 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 finds no connection to the control unit, and the fault memory cannot be cleared.

These signs appear singly or together. The light alone is a clear signal that something in the system is wrong.

In an emergency, airbags and seatbelt pretensioners may possibly fail to trigger in the event of a defect. It is therefore worth having the fault memory read out promptly rather than ignoring the warning.

Which vehicles is the 28556 JX02A fitted in?

The control unit 28556 JX02A is fitted in these vehicles: Nissan NV200 M20 (2009-2021).

The matching vehicles are listed individually here. Compare make and model of your car with the list.

• Nissan NV200 M20 (2009-2021)

Compare the part number on the label of the removed unit with this page, so that you can be sure it is the right unit. Please also have the fault memory read out before you touch the control unit, because only this result 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 3LS1E, 285563LS0E, 98820 3LS2D, 98820-1PD0B, 98820-3LM0A, 98820-3LM0B.

How does the repair of the 28556 JX02A work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send in the well-packed unit. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

The order of these steps is a safety measure. The fault memory is read out before all other steps so that the log accompanies the unit, and the control unit is removed only after the battery has been disconnected.

Airbag24 examines the unit on the test bench, replaces defective components, erases the stored 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 JX02A get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel, and pack the unit shock-resistant.