Airbag control unit with part number 28556-3RF0B

What does the airbag control unit 28556-3RF0B do?

The airbag control unit 28556-3RF0B is the central electronics of the restraint system in Nissan. Based on the crash sensors, it decides whether the airbags and seatbelt pretensioners deploy, and it monitors the system continuously.

In the event of a fault, it switches on the airbag warning light and records the finding in the fault memory.

After an accident, it secures the crash data and locks itself in this state.

Why does the control unit 28556-3RF0B fail?

The most common cause is stored crash data from an accident, even if no airbag has deployed. A standard diagnostic tool cannot erase it. Other causes include aged electronics, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

The crash data remains in the unit until it is removed during the repair. That is why a fault can persist even when the vehicle appears to drive normally.

The following causes may also apply:

• Components that wear out over time
• Solder joints with poor contact
• Moisture and corrosion at plug connections
• Voltage spikes from a weak battery or jump-starting

How can you tell that the 28556-3RF0B is defective?

A airbag warning light that lights up permanently or intermittently is the most important sign. Added to this are a fault message in the instrument cluster, a lost connection between the diagnostic tool and the control unit 28556-3RF0B, and a fault memory that cannot be cleared.

The light in the instrument cluster signals a fault, even if the driver notices nothing else. Fault messages in the display are added where the system shows them. A lost connection to the diagnostic tool may lie in the control unit, but it does not have to.

As long as the fault exists, airbags and seatbelt pretensioners may not deploy in an emergency. An early check is therefore recommended.

Which vehicles is the 28556-3RF0B fitted in?

The control unit 28556-3RF0B was fitted by Nissan in the following vehicles: Nissan Sylphy B17 (from 2012). The details refer to the application cases known so far.

The vehicles known to us are shown in the list below:

• Nissan Sylphy B17 (from 2012)

Comparing the part number on the label of the removed unit with this page is a test for the correct unit and nothing more. Whether the control unit is defective is only decided by the fault memory. Please have it read out before removal, because a connector or a cable may be the actual cause.

How does the repair of the 28556-3RF0B work?

For safety reasons, the sequence is fixed: first read out the fault memory and enclose the log, then disconnect the battery and afterwards remove the control unit 28556-3RF0B. Then create a repair order online and pack the unit carefully. Airbag24 needs 3–4 working days for checking, repairing and testing.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. The unit then returns 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 28556-3RF0B get to Airbag24?

The control unit 28556-3RF0B reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Do not forget to put the printed repair order in the parcel, and pack the unit shock-proof.