Airbag control unit with part number 98820-4RJ0B

What does the airbag control unit 98820-4RJ0B do?

The airbag control unit 98820-4RJ0B is the central control unit of the restraint system (SRS) in Nissan. It evaluates the signals from the crash sensors, decides in a crash within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

Faults are reported by the unit via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself.

In everyday use the control unit works unobtrusively in the background. It continuously checks whether sensors, wiring, seatbelt pretensioners and airbags are ready for operation.

Why does the control unit 98820-4RJ0B fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Further causes are aged electronic components, dry joints, moisture and corrosion on plug connectors, and voltage spikes, for example from a weak battery or jump-starting.

An ordinary diagnostic tool does not make these crash data disappear. During the repair Airbag24 ensures that they are removed.

Which of the other causes applies to this unit can only be determined on the individual unit. To find out, we examine the components on the test bench one by one.

How can you tell that the 98820-4RJ0B is defective?

A defect shows up as an airbag warning light that lights up permanently or intermittently, as an error message in the instrument cluster, as a lack of connection to the diagnostic tool, and as a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The warning light is the most direct indication of the state of the system. It reports a fault as soon as the control unit detects one.

If the diagnostic tool cannot connect to the control unit, or the fault memory remains full after an attempt to clear it, there is a fault that must be checked.

Which vehicles is the 98820-4RJ0B fitted in?

The 98820-4RJ0B is fitted in these vehicles: Nissan Maxima A36 (2015-2023).

The following vehicles are on record for this part number:

• Nissan Maxima A36 (2015-2023)

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

For the same vehicles, we also repair control units with the part numbers 98820-3Y600, 98820-AV200, 98820-AV21A.

How does the repair of the 98820-4RJ0B work?

First have the fault memory read out, enclose the log, then disconnect the battery and only then remove the 98820-4RJ0B. Next create a repair order online and send the unit in well packed. Airbag24 typically needs 3–4 working days for checking, repairing and testing.

Airbag24 examines the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Afterwards 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 98820-4RJ0B get to Airbag24?

You send the 98820-4RJ0B as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns the unit by UPS.

Put the printed repair order into the parcel, and pack the unit shock-resistant.