Airbag control unit with part number 28556 5X00A

What does the airbag control unit 28556 5X00A do?

The airbag control unit 28556 5X00A coordinates the restraint system (SRS) of Nissan. It evaluates the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and shows faults via the airbag warning light.

The control unit checks the system continuously whenever the vehicle is switched on, and monitors the connection of the sensors, airbags and seatbelt pretensioners.

After an accident the unit stores crash data and locks itself. The lock ends only with the repair.

Why does the control unit 28556 5X00A fail?

The most important reason is crash data from an accident, even without a triggered airbag; it cannot be removed with a normal diagnostic tool. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting, are also causes.

Airbag24 removes the crash data during the repair; the diagnostic tool cannot perform this step.

The other causes concern the electronics. Aged components and cold solder joints are among them, as are moisture and corrosion at the plug connections.

Voltage spikes in the vehicle electrical system add further stress to the electronics.

How can you tell that the 28556 5X00A is defective?

You can recognise a defect on the 28556 5X00A by the airbag warning light in the instrument cluster, which lights permanently or intermittently, and by a fault message in the instrument cluster. If the connection to the diagnostic tool is missing or the fault memory cannot be erased, this points to a malfunction. In an emergency, airbags and seatbelt pretensioners may possibly not deploy.

The airbag warning light in the instrument cluster responds to every fault the system detects. It is the signal you notice first.

The diagnostic tool shows additionally whether it reaches the control unit. If the connection fails or the fault memory stays put, a detailed inspection is advisable.

Which vehicles is the 28556 5X00A fitted in?

The airbag control unit 28556 5X00A is fitted in these vehicles: Nissan Navara D40 (2005-2007) and D40 Facelift (2007-2015).

The list shows the vehicles of Nissan in which this control unit is provided.

• Nissan Navara D40 (2005-2007)
• Nissan Navara D40 Facelift (2007-2015)

A comparison of the part number on the label with this page confirms that you have the correct unit in front of you. Whether the unit itself is defective is revealed only by the fault memory read out, because a plug or a cable can be the cause just as well.

For the same vehicles, we also repair control units with the part numbers 285001734, 28556 4X00A, 28556EA100, 98820 5X20B, 98820 EB01C, 98820 EB01D.

How does the repair of the 28556 5X00A work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit 28556 5X00A, create the repair order online and send the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

From this point Airbag24 takes over: the unit is examined, damaged parts are repaired, the crash data is erased and a functional test is carried out.

Your own unit 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 5X00A get to Airbag24?

You can send the control unit 28556 5X00A as a parcel or book a UPS collection for an extra charge. After the repair, the return is made by UPS.

The printed repair order goes into the parcel. Make sure the unit is packed shock-proof.