Airbag control unit with part number 98820-3NC1A

What does the airbag control unit 98820-3NC1A do?

The airbag control unit 98820-3NC1A controls the restraint system (SRS) in Nissan vehicles. In an impact it evaluates the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners are triggered.

During the rest of operation the unit continuously monitors the system's components. If it detects a fault, it shows this via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and locks itself. While driving this stays invisible; during a diagnosis it becomes clearly apparent.

Why does the control unit 98820-3NC1A fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot delete it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

A diagnostic tool cannot remove the data, so the cause remains in the unit. The fault search must therefore start at the control unit and not at individual cables.

Aged components and cold solder joints change over time and can then cause faults. Moisture, corrosion and voltage spikes from the vehicle electrical system additionally affect the electronics.

How can you tell that the 98820-3NC1A is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The warning light is a clear sign that the system has detected a deviation. It is based on the control unit's self-monitoring and is not a mere assumption.

In an emergency, airbags and seatbelt pretensioners may possibly fail to trigger. A prompt clarification of the warning is therefore advisable.

Which vehicles is the 98820-3NC1A fitted in?

The information comes from our assignment to this part number. The control unit 98820-3NC1A is fitted in these vehicles: Nissan Leaf ZE0 (2010-2017).

Here are the vehicles recorded so far that we assign to this part number. The overview is not meant to be exhaustive.

• Nissan Leaf ZE0 (2010-2017)

Two steps are important before sending. Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. Have the fault memory read out beforehand, because only that result 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 98820-3NF0A, 98820-5SA0E, K8820-3NA0A.

How does the repair of the 98820-3NC1A work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Next create a repair order online and send the well-packed unit. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, deletes 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 98820-3NC1A get to Airbag24?

You send the unit as a parcel or you book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit so that it is shock-resistant.