Airbag control unit with part number 28556-3RR0A

What does the airbag control unit 28556-3RR0A do?

The airbag control unit 28556-3RR0A directs the restraint system in the Nissan. It evaluates the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners are triggered.

During operation it monitors the system continuously. If it detects a fault, the airbag warning light in the instrument cluster lights up.

After an accident the control unit stores crash data and locks itself. Airbag24 removes the crash data during the repair.

Why does the control unit 28556-3RR0A fail?

The most frequent cause is stored crash data after an accident, even if no airbag has been triggered. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

A normal diagnostic tool cannot erase the crash data. Airbag24 takes care of this as part of the repair.

Aged electronic components and cold solder joints count among the technical causes. Moisture and corrosion at plug connections disrupt the connection, and voltage spikes load the unit's power supply.

How can you tell that the 28556-3RR0A is defective?

The defect shows mainly through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. A fault message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared are also signs.

• Airbag warning light lights up permanently or intermittently
• Fault message in the instrument cluster
• The diagnostic tool gets no connection to the control unit
• The fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may not trigger in an emergency. A check is therefore advisable.

Which vehicles is the 28556-3RR0A fitted in?

The control unit 28556-3RR0A is fitted in these vehicles: Nissan Sylphy B17 (from 2012).

The allocation of vehicles:

• Nissan Sylphy B17 (from 2012)

The part number on the label can be compared with this page. That only confirms that it is the correct unit. Whether the control unit itself is defective or a plug or cable is the cause only becomes clear from reading the fault memory. Have it read beforehand.

How does the repair of the 28556-3RR0A work?

First have the fault memory read and enclose the log. Then disconnect the battery and only then remove the control unit. Next create a repair order online, pack the unit well and send it in. Airbag24 examines it on the test bench, replaces defective components if needed, erases the crash data and runs a function test. After that your own unit goes back to you.

This sequence serves safety.

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

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 28556-3RR0A get to Airbag24?

You send the unit to us as a parcel, or you book a UPS collection for an extra charge. Airbag24 returns it to you by UPS after the repair. You enclose the printed repair order and pack the control unit shock-proof.

A stable shell with padding protects the unit on the way.