Airbag control unit with part number 28556-1DE0B

What does the airbag control unit 28556-1DE0B do?

The airbag control unit 28556-1DE0B is the central control unit of the restraint system (SRS) for Nissan. It evaluates the signals from the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered. After an accident, it stores crash data and locks itself.

The unit monitors the system continuously. If it detects a fault, it reports it via the airbag warning light in the instrument cluster. This lets you, as the driver, recognise that something is wrong with the restraint system. The safety of the occupants therefore depends largely on this control unit.

Why does the control unit 28556-1DE0B fail?

Most common cause with the 28556-1DE0B: crash data stored after an accident that cannot be erased with a standard diagnostic tool. With this control unit, erasing the crash data is often not possible; if you wish to have it erased, contact Airbag24 briefly before sending the unit in, and Airbag24 will then check the part number. Other causes are aged electronic components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data is also stored when no airbag has deployed. Other possible causes are:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 28556-1DE0B is defective?

A fault in the 28556-1DE0B first shows up as the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Additional signs include fault messages in the instrument cluster, a lack of connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy, so you should have the fault checked promptly. The underlying cause cannot be determined from these signs alone. Signs of this kind should not be ignored.

Which vehicles is the 28556-1DE0B fitted in?

The control unit 28556-1DE0B is fitted in these vehicles: Nissan X-Trail T31 (2007-2010) and T31 Facelift (2010-2014). Which of them matches your car can be seen in the list on this page.

These vehicles are listed for this part number:

• Nissan X-Trail T31 (2007-2010)
• Nissan X-Trail T31 Facelift (2010-2014)

Compare the part number on the label of the removed unit with this page, so that you can be sure you have the correct unit in front of you. Whether the control unit is faulty or a connector or cable is the cause is shown only by the fault memory, which you should have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 98820JH200, 98820JH30A, 98820JH40A, 98820JH43A.

How does the repair of the 28556-1DE0B work?

First have the fault memory read out and enclose the log; then disconnect the battery and remove the 28556-1DE0B. Next, create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

On the test bench, Airbag24 checks the unit, repairs defective components and then carries out a functional test. This test checks the unit before it is sent back. Your unit then comes back to you. If you want the crash data erased, contact Airbag24 briefly before sending the unit in.

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 28556-1DE0B get to Airbag24?

You send the 28556-1DE0B in as a parcel; alternatively, you can book a UPS collection for an extra charge. Airbag24 then sends the repaired unit back to you by UPS.

The printed repair order belongs in the parcel, and the unit should be packed shock-resistant. Make sure the parcel is securely sealed.