Airbag control unit with part number 98820-4FA4B

What does the airbag control unit 98820-4FA4B do?

The 98820-4FA4B, as the airbag control unit, controls the SRS restraint system of Nissan. It processes the signals from the crash sensors, selects the appropriate airbags and seatbelt pretensioners in an impact, and reports faults via the airbag warning light.

An accident causes the unit to record crash data. It then locks itself, and the data remain stored in it.

Why does the control unit 98820-4FA4B fail?

With this 98820-4FA4B, crash data come first: they are stored after an accident, even without a triggered airbag. Ordinary diagnostic equipment cannot remove this data. Aged components, moisture and voltage spikes are further possibilities.

Further causes include:

• aged components in the electronics
• cold solder joints
• moisture and corrosion at connectors
• voltage spikes, for example from a weak battery

How can you tell that the 98820-4FA4B is defective?

A defect in the 98820-4FA4B becomes visible when the airbag warning light in the instrument cluster lights up constantly or intermittently, or when an error message appears.

Typical characteristics are:

• The airbag warning light is on constantly or intermittently.
• An error message appears in the instrument cluster.
• A diagnostic tool does not communicate with the control unit.
• The fault memory remains even after an attempt to erase it.

In an emergency, the airbags and seatbelt pretensioners may then not trigger. So have the findings clarified promptly.

Which vehicles is the 98820-4FA4B fitted in?

The 98820-4FA4B is used in these vehicles: Nissan NV200 M20 (2009-2021).

The overview shows the assignment in detail:

• Nissan NV200 M20 (2009-2021)

Compare the part number on the label of the removed unit with this page. That only confirms it is the right unit. Whether the control unit itself is defective or a plug or cable is affected is shown only by the fault memory, which you should have read out before removal.

For the same vehicles, we also repair control units with the part numbers 28556 3LS1E, 285563LS0E, 98820 3LS2D, 98820-1PD0B, 98820-3LM0A, 98820-3LM0B.

How does the repair of the 98820-4FA4B work?

First have the fault memory read out, attach the log, disconnect the battery, and only then remove the 98820-4FA4B. Then create the repair order online and send the unit in. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the unit is first inspected on the test bench. Afterwards, defective components are repaired, crash data are erased and a function test is run. Finally your own unit is returned 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 98820-4FA4B get to Airbag24?

The 98820-4FA4B reaches Airbag24 either as a parcel or via a UPS collection that you book for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Include the printed repair order in the parcel; the unit should be packed shock-proof.