Airbag control unit with part number 28556 8H50E

What does the airbag control unit 28556 8H50E do?

The airbag control unit 28556 8H50E is the central control unit of the restraint system (SRS) for Nissan. It evaluates the crash sensors and, in a crash, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

It also monitors the entire system continuously. It shows faults via the airbag warning light in the instrument cluster.

After an accident, the unit stores crash data and locks itself. This affects the control unit itself.

Why does the control unit 28556 8H50E fail?

For the 28556 8H50E, the most common cause is stored crash data after an accident, even if no airbag was triggered. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A normal diagnostic tool does not delete the crash data. It therefore remains stored until Airbag24 removes it during the repair.

The other causes lie in the electronics themselves. With age, components lose stability, solder joints can go cold, and moisture attacks contacts. A weak battery or jump-starting can produce voltage spikes.

How can you tell that the 28556 8H50E is defective?

The airbag warning light in the instrument cluster 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 indicate the defect.

In an emergency, airbags and seatbelt pretensioners may then fail to trigger. This condition should not be left unattended for long.

The warning light shows the defect, so you do not have to wait for chance to notice it.

Which vehicles is the 28556 8H50E fitted in?

The 28556 8H50E is fitted in these vehicles: Nissan X-Trail T30 (2001-2003) and T30 Facelift (2003-2007).

The following list names the vehicles that Airbag24 has assigned to this part number.

• Nissan X-Trail T30 (2001-2003)
• Nissan X-Trail T30 Facelift (2003-2007)

Compare the part number on the label of the removed unit with this page. This only ensures that you have the correct unit in front of you. Have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 41650EQ070, 988208H40C, 98820JH43A, A68-000U06.

How does the repair of the 28556 8H50E work?

Processing at Airbag24 takes 3–4 working days. First have the fault memory read out and attach the log, then disconnect the battery. Only then remove the control unit and create a repair order online.

This sequence is mandatory for safety reasons. Then pack the unit well and send it in.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a functional test. After that, the unit goes 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 8H50E get to Airbag24?

You send the 28556 8H50E as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.