Airbag control unit with part number 28556-9CK0A

What does the airbag control unit 28556-9CK0A do?

The airbag control unit 28556-9CK0A controls the SRS system of Nissan. It reads the messages from the impact sensors, calculates in an accident, in fractions of a second, which restraint devices fire, and constantly monitors the entire system.

If it detects a fault, the airbag warning light comes on, and the message remains stored in the fault memory.

After an accident the control unit stores crash data and locks itself. The lock is lifted only by the repair.

Why does the control unit 28556-9CK0A fail?

The most common cause for the 28556-9CK0A is crash data stored after an accident, even if no airbag has deployed. Further triggers are aged components and cold solder joints, as well as moisture and corrosion at plug connections.

Crash data cannot be deleted with a normal diagnostic tool. Airbag24 takes care of this during the repair.

In addition there are voltage spikes, for example from a weak battery or a jump start, which can put a strain on the electronics.

How can you tell that the 28556-9CK0A is defective?

A defect on the 28556-9CK0A becomes visible through the airbag warning light in the instrument cluster and through fault messages. It also shows when the diagnostic tool cannot establish a connection or the fault memory cannot be cleared.

• airbag warning light lights up continuously
• airbag warning light lights up only at times
• fault message in the instrument cluster
• diagnostic tool cannot find the control unit
• fault memory cannot be cleared

The light is not a minor matter. In an emergency, airbags and seatbelt pretensioners may possibly not trigger, so have the warning clarified promptly.

Which vehicles is the 28556-9CK0A fitted in?

The airbag control unit 28556-9CK0A is fitted in these vehicles: Nissan Xterra N50 (2005-2008) and N50 Facelift (2008-2015).

The following vehicles are on record for this part number:

• Nissan Xterra N50 (2005-2008)
• Nissan Xterra N50 Facelift (2008-2015)

Compare the part number on the label of the removed unit with this page; that only shows that you have the right unit. Also read out the fault memory beforehand. Only this log clarifies whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 28556-EC00B, 98820-AV200, 98820-AV21A, 98820-ZP31A.

How does the repair of the 28556-9CK0A work?

You have the fault memory read out and attach the log before disconnecting the battery. Only then do you remove the 28556-9CK0A, create a repair order online and send in the well-packed unit.

At Airbag24 the unit is examined on the test bench, defective components are replaced, and then the team deletes the stored crash data. A function test follows before your own unit is sent back.

Processing at Airbag24 takes 3–4 working days as a rule, and this time covers only checking, repairing and testing. 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 28556-9CK0A get to Airbag24?

Either you send the 28556-9CK0A in as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

The printed repair order belongs in the parcel, and the unit should be packed shockproof. The choice of shipping route does not change the course of the repair.