Airbag control unit with part number 28556-3SG0A

What does the airbag control unit 28556-3SG0A do?

The airbag control unit 28556-3SG0A forms the centre of the restraint system (SRS) in the Nissan. It analyses the signals of the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners are triggered.

At the same time, it monitors the entire system. To do so, it continuously checks the connections and components that belong to the system for irregularities.

If a fault occurs, the unit switches on the airbag warning light in the instrument cluster. After an accident, it secures crash data and locks itself.

Why does the control unit 28556-3SG0A fail?

The most common cause with the 28556-3SG0A is crash data stored after an accident, even without a triggered airbag. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

The stored crash data cannot be cleared with a normal diagnostic tool. Airbag24 removes it during the repair.

Aged components, cold solder joints, and moisture or corrosion on the contacts are the remaining possible causes.

How can you tell that the 28556-3SG0A is defective?

A defect in the 28556-3SG0A becomes recognisable through the airbag warning light in the instrument cluster when it stays on constantly or intermittently. Further signs are an error message, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared.

Such signs indicate that something is wrong in the restraint system. In an emergency, the airbags and seatbelt pretensioners may fail to deploy.

Therefore have the finding checked promptly.

Which vehicles is the 28556-3SG0A fitted in?

The control unit 28556-3SG0A is fitted in these vehicles: Nissan Sylphy B17 (from 2012).

Here follows the list of vehicles with this part number.

• Nissan Sylphy B17 (from 2012)

Compare the part number on the label of the removed unit with this page, so you can see whether you have the correct unit. Have the fault memory read out beforehand, because only the result shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 28556-3SG0A work?

For the 28556-3SG0A, you first read out the fault memory and enclose the log. Then you disconnect the battery, and only then remove the control unit. Last, you create the repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Your own unit is then returned to you.

Checking, repairing and testing at Airbag24 normally take 3–4 working days.

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 28556-3SG0A get to Airbag24?

The 28556-3SG0A reaches Airbag24 either as a parcel or via a UPS collection booked for an extra charge. After the repair, it is returned to you by UPS.

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