Airbag control unit with part number 28556-3RA0A

What does the airbag control unit 28556-3RA0A do?

The airbag control unit 28556-3RA0A belongs to the restraint system (SRS) of Nissan and controls it. In a crash it evaluates the crash sensors and determines which airbags and seatbelt pretensioners are triggered. It also monitors the system and reports faults via the airbag warning light.

The decision is made within milliseconds. To make this possible, the unit continuously checks its sensors and the wiring for plausibility.

After a crash it stores crash data and locks itself. Keep this state in mind whenever anything unusual occurs.

Why does the control unit 28556-3RA0A fail?

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

Crash data cannot be removed with an ordinary diagnostic tool. Airbag24 erases it during the repair.

Which other causes apply to your unit is determined only by the examination. A guess without an examination would not be reliable at this point.

How can you tell that the 28556-3RA0A is defective?

You recognise a defect by the airbag warning light in the instrument cluster being on permanently or intermittently. An error message, a diagnostic tool without a connection to the control unit, or a fault memory that cannot be cleared also point to a fault. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

These signs can occur individually or together:

• airbag warning light, permanently or intermittently
• error message in the instrument cluster
• diagnostic tool without a connection to the control unit
• fault memory that cannot be cleared

Each of these indications deserves a check, even if the vehicle is driving normally.

Which vehicles is the 28556-3RA0A fitted in?

The 28556-3RA0A is fitted in vehicles: Nissan Sylphy B17 (from 2012). The information is limited to the vehicles we have recorded so far.

The known models are listed here:

• Nissan Sylphy B17 (from 2012)

A comparison of the part number on the label with this page shows whether it is the correct unit, but no more. Whether the control unit itself is defective is revealed only by the fault memory. Have it read out beforehand, because it also shows whether a plug or cable is the cause.

How does the repair of the 28556-3RA0A work?

Your first step is reading out the fault memory. Then disconnect the battery and remove the control unit. Afterwards create the repair order online and send in the well-packed unit with the log. Airbag24 then checks, repairs and tests it.

Processing at Airbag24 usually takes 3–4 working days. There the unit is checked on the test bench, defective components are replaced, the crash data is erased and a function test is carried out. Your own unit then 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 28556-3RA0A get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

A shockproof carton protects the control unit, and the printed repair order is enclosed.