Airbag control unit with part number 28556-3RD0B

What does the airbag control unit 28556-3RD0B do?

The airbag control unit 28556-3RD0B coordinates the restraint system (SRS) of Nissan. Via the crash sensors it detects an accident, determines within fractions of a second the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it locks itself, and only a repair lifts the lock.

The monitoring covers circuits, sensors and the connection to the triggers. Deviations found are stored in the fault memory and shown on the airbag warning light in the instrument cluster.

The control unit is thus the point where everything comes together whenever the protection of the occupants is at stake.

Why does the control unit 28556-3RD0B fail?

The most common trigger is a crash data record stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot remove it. Aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible.

The control unit records crash data after an accident. An ordinary reading tool cannot erase it, so the entry stays in the memory, and only a repair removes it.

Further causes at a glance:

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

How can you tell that the 28556-3RD0B is defective?

The airbag warning light in the instrument cluster stays on intermittently or permanently, an error message appears, the diagnostic tool finds no control unit, and the fault memory cannot be cleared.

In addition, the instrument cluster serves as the display: an error message accompanies the lit warning light, and it does not disappear by itself as long as the fault persists.

As long as a defect exists, airbags and seatbelt pretensioners may fail to deploy in an emergency. The warning light makes the defect visible, so a prompt check is the right step.

Which vehicles is the 28556-3RD0B fitted in?

The control unit 28556-3RD0B is fitted in these vehicles: Nissan Sylphy B17 (from 2012).

The following overview shows which models belong to this control unit.

• Nissan Sylphy B17 (from 2012)

First compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit and clarifies no cause. Then have the fault memory read out; only this log shows whether the control unit is defective or whether a connector or cable is the cause.

How does the repair of the 28556-3RD0B work?

Read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit 28556-3RD0B. Next, create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is checked on the test bench. Defective components are replaced, the stored crash data are deleted, and a function test is carried out.

Your own unit then 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 28556-3RD0B get to Airbag24?

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

Enclose the printed repair order and pack the control unit 28556-3RD0B shock-proof. This way it arrives undamaged at the workshop.