Airbag control unit with part number 28556 EB50B

What does the airbag control unit 28556 EB50B do?

The airbag control unit 28556 EB50B is the controller of the restraint system (SRS) in Nissan. It evaluates the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners to trigger, and monitors the system continuously. After an accident it stores crash data and locks itself.

It shows faults via the airbag warning light so that you can read the state of the system.

Crash data arise from the course of the accident and are stored in the unit afterwards.

Why does the control unit 28556 EB50B fail?

Crash data stored after an accident are the most common cause, even without a triggered airbag; a standard diagnostic tool does not remove them. Other possible causes include ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data are the most common trigger for problems of this kind. The unit stores them even when no airbag has deployed, and an ordinary diagnostic tool cannot remove them.

Ageing components and cold solder joints impair the function over time. Moisture, corrosion and voltage spikes, for example from a jump start, put additional strain on the electronics.

How can you tell that the 28556 EB50B is defective?

A fault first shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Also a fault message in the instrument cluster, no connection to the 28556 EB50B, and a fault memory that cannot be cleared. In an emergency the airbags and seatbelt pretensioners may then fail to trigger.

The following signs indicate a fault:

• Airbag warning light on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

Each of these signs is a reason to have the system checked.

Which vehicles is the 28556 EB50B fitted in?

The 28556 EB50B is fitted in these vehicles: Nissan Pathfinder R51 1st Facelift (2007-2010), R51 (2004-2007) and R51 2nd Facelift (2010-2013). If your car matches this information, the unit is intended for your vehicle.

The list of vehicles is as follows:

• Nissan Pathfinder R51 1st Facelift (2007-2010)
• Nissan Pathfinder R51 (2004-2007)
• Nissan Pathfinder R51 2nd Facelift (2010-2013)

Comparing the part number on the label of the removed unit with this page only ensures that it is the right unit. Have the fault memory read out beforehand; only the log shows whether the control unit is defective or whether a plug or cable is behind it.

For the same vehicles, we also repair control units with the part numbers 0285001781 Bosch, 98820 5X10A, 98820 EA510, 98820 EA51C, 98820-3KA0A, 98820-3KB0A.

How does the repair of the 28556 EB50B work?

First have the fault memory of the 28556 EB50B read out and attach the log. Then disconnect the battery and remove the control unit; next create a repair order online and send in the well-packed unit. At Airbag24, checking, repairing and testing usually take 3–4 working days.

You follow this sequence because it is prescribed for safety reasons.

At Airbag24 the unit is checked on the test bench, defective components are repaired or replaced, stored crash data are deleted and a function test is carried out. The 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 EB50B get to Airbag24?

You send the control unit 28556 EB50B as a parcel or book a UPS collection for an extra charge. Airbag24 sends the repaired unit back to you by UPS.

Enclose the printed repair order with the parcel, and pack the unit shockproof.