Airbag control unit with part number 28556-3SG0B

What does the airbag control unit 28556-3SG0B do?

Within the restraint system (SRS) of Nissan, the airbag control unit 28556-3SG0B decides which airbags and seatbelt pretensioners are triggered. To do this, it evaluates the crash sensors and checks the system continuously.

It shows faults via the airbag warning light in the instrument cluster.

An accident results in crash data being stored, after which the unit is locked.

Why does the control unit 28556-3SG0B fail?

The most common cause is crash data that remains stored after an accident, even when no airbag has triggered; an ordinary diagnostic tool does not erase it. Other causes are ageing electronic components, cold solder joints, moisture or corrosion on plugs, and voltage spikes.

Crash data arises on impact and then sits in the control unit until it is removed during the repair.

Ageing and cold solder joints work gradually, so faults can stay unnoticed for a long time.

Moisture and corrosion impair the contact, and voltage spikes, for example from a weak battery or a jump start, stress the electronics.

How can you tell that the 28556-3SG0B is defective?

Signs are an airbag warning light that stays on permanently or intermittently, a message in the instrument cluster, a diagnostic tool without connection and a fault memory that cannot be emptied. In an emergency, airbags and seatbelt pretensioners may therefore fail to trigger.

• Airbag warning light stays on permanently or intermittently
• Message in the instrument cluster
• No connection from the diagnostic tool
• Fault memory cannot be emptied

The light reports the finding itself, which is why a check must not be put off.

Which vehicles is the 28556-3SG0B fitted in?

The 28556-3SG0B is fitted in these vehicles: Nissan Sylphy B17 (from 2012).

The following vehicle data is available for this unit:

• Nissan Sylphy B17 (from 2012)

Matching the part number on the label of the removed unit with this page only confirms that you have the right unit. What decides whether the control unit is defective or a plug or cable is at fault is the fault memory, read out beforehand.

How does the repair of the 28556-3SG0B work?

The fault memory is read out first, the log is enclosed, then the battery is disconnected and the control unit removed. Only after that do you create a repair order online and send the unit in well packed. At Airbag24, checking, repairing and testing usually take 3–4 working days.

At ours, the unit is examined on the test bench, defective components are repaired, crash data is erased and a function test is carried out. Then your own unit comes 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 28556-3SG0B get to Airbag24?

You send the unit to Airbag24 as a parcel, or you arrange a UPS collection for an extra charge. The return after the repair runs via UPS.

Pack the control unit shock-resistant and enclose the printed repair order.