Airbag control unit with part number 28556 1U62B

What does the airbag control unit 28556 1U62B do?

The 28556 1U62B is the airbag control unit for the restraint system (SRS) in Nissan. It processes the data from the crash sensors, selects the airbags and seatbelt pretensioners to be triggered within milliseconds of an impact, and checks the system continuously for faults. It shows faults via the airbag warning light.

After an accident the control unit stores crash data and locks itself. This makes it not only a switching point but also a memory.

Why does the control unit 28556 1U62B fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Ageing electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes are also among the causes.

Stored crash data sits inside the control unit itself, and a standard diagnostic tool cannot erase it.

Ageing electronic components lose their function, cold solder joints gradually lose contact, and moisture promotes corrosion.

Voltage spikes occur, for example, with a weak battery or when a jump-start cable is connected, and place additional strain on the electronics.

How can you tell that the 28556 1U62B is defective?

The airbag warning light in the instrument cluster stays on permanently or comes on intermittently. A fault message appears alongside it, and the diagnostic tool gets no connection to the control unit. In an emergency, the airbags and seatbelt pretensioners could then fail to deploy.

These signs belong to the system's warning signal and must not be ignored. A fault memory that cannot be cleared is a separate finding.

Which vehicles is the 28556 1U62B fitted in?

The 28556 1U62B is fitted in these vehicles: Nissan Note E11 (2005-2007), E11 1st Facelift (2007-2009) and E11 2nd Facelift (2009-2013).

The vehicles this part number belongs to are listed below:

• Nissan Note E11 (2005-2007)
• Nissan Note E11 1st Facelift (2007-2009)
• Nissan Note E11 2nd Facelift (2009-2013)

Compare the part number on the label of the removed unit with this page; this only checks whether it is the right unit. Have the fault memory read out before removal, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 285001909, 98820 BH20A, 98820-3VC0A, 98820-9U10A, 988209U30A.

How does the repair of the 28556 1U62B work?

First have the fault memory read out and attach the log. Then disconnect the battery and only now remove the control unit; afterwards create a repair order online. You send in the well-packed unit, and Airbag24 tests it, replaces defective components, erases stored crash data and tests the function.

The sequence is binding for safety reasons. For Airbag24, processing usually takes 3–4 working days, covering testing, repair and function testing only.

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 1U62B get to Airbag24?

You send the unit as a parcel to Airbag24 or book a UPS collection for an extra charge. After the repair, your own unit comes back to you by UPS.

Place the printed repair order in the parcel and cushion the control unit shock-proof.