Airbag control unit with part number 28556-3SL0A

What does the airbag control unit 28556-3SL0A do?

In the Nissan vehicle, the airbag control unit 28556-3SL0A coordinates the restraint system. From the sensor signals it determines which airbags and seatbelt pretensioners fire in a collision, within milliseconds.

It also monitors the system continuously. If a problem exists, the airbag warning light appears in the instrument cluster, accompanied by a fault message.

After an accident, the unit records crash data and then locks itself. This data is held in the control unit and is removed by Airbag24 during the repair.

Why does the control unit 28556-3SL0A fail?

The most common cause is stored crash data from an accident, even if no airbag has deployed. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or a jump start.

The diagnostic tool cannot remove the crash data. Airbag24 therefore erases it during the repair.

Electronic components are subject to ageing. Solder joints can go cold, and moisture or corrosion impair plug connections. Fluctuations in the on-board voltage, for example from a weak battery, put additional strain on the unit.

How can you tell that the 28556-3SL0A is defective?

The airbag warning light in the instrument cluster indicates a defect by lighting up constantly or intermittently. It is accompanied by a fault message in the instrument cluster, and the diagnostic tool finds no connection to the control unit.

In addition, the fault memory cannot be cleared. As long as the fault exists, airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light is therefore a warning signal and calls for an inspection.

Which vehicles is the 28556-3SL0A fitted in?

The control unit 28556-3SL0A is fitted in these vehicles: Nissan Sylphy B17 (from 2012).

The list shows the assigned vehicles:

• Nissan Sylphy B17 (from 2012)

Comparing the part number on the unit with this page only confirms that it is the correct control unit. Whether the unit is actually defective or a plug or cable is the cause can only be shown by reading out the fault memory. Have it read out before removal.

How does the repair of the 28556-3SL0A work?

First have the fault memory read out and enclose the log. Next, disconnect the battery, and only then remove the control unit. Then create a repair order online and send the well-packed unit in. Airbag24 checks it on the test bench, renews defective components where necessary, erases the crash data and carries out a function test before the unit is returned to you. Processing at Airbag24 usually takes 3–4 working days.

The sequence is mandatory for safety reasons.

For checking, repairing and testing at Airbag24, 3–4 working days are usually planned.

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 28556-3SL0A get to Airbag24?

Either you send the unit to us as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends it back to you via UPS after the repair. The printed repair order belongs in the parcel, and you pack the unit shock-resistant.

A stable shell and sufficient padding keep the control unit intact on the entire journey.