Airbag control unit with part number 98820-5SP0B

What does the airbag control unit 98820-5SP0B do?

The airbag control unit 98820-5SP0B coordinates the restraint system (SRS) of Nissan. It processes the readings from the crash sensors, determines in a collision which airbags and seatbelt pretensioners trigger, and monitors the entire system. After an accident it stores crash data and locks itself.

Monitoring covers all connected components and runs without interruption. If the unit detects a fault, it shows this via the airbag warning light in the instrument cluster.

The evaluation has to succeed within milliseconds, because in a collision there is no time for queries. The protective effect of the whole system relies on this.

Why does the control unit 98820-5SP0B fail?

Crash data stored after an accident are the most common cause, even when no airbag has triggered. They cannot be erased with a normal diagnostic tool. Other possible causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data remain in the control unit, even if nothing outwardly visible was wrong with the airbags. A standard diagnostic tool cannot remove them, so simply reading the fault memory does not solve the problem.

The other causes tend to be gradual. Components age, solder joints can go cold, and moisture or corrosion attack the contacts. Voltage spikes in the vehicle electrical system additionally strain the electronics.

How can you tell that the 98820-5SP0B is defective?

An airbag warning light in the instrument cluster that burns permanently or keeps coming on is the first sign. Added to this are an error message on the display, a diagnostic tool without a connection to the control unit, and a fault memory that cannot be emptied. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light indicates the defect, whether it appears constantly or only now and then. Either is a reason for a check.

Diagnosis on the control unit itself brings clarity: only the read-out decides whether the control unit is affected or whether a cable is behind it.

Which vehicles is the 98820-5SP0B fitted in?

The control unit 98820-5SP0B is fitted in these vehicles: Nissan Leaf ZE1 (from 2017). Whether your vehicle is among them is shown by the comparison below.

The vehicles are listed here for an overview:

• Nissan Leaf ZE1 (from 2017)

Comparing the part number with the label on the removed unit confirms that it is the correct unit. It cannot establish a cause. Therefore have the fault memory read out before removal, because only its log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98820-4NS0A, 98820-4NS9A, 98820-5SA0E.

How does the repair of the 98820-5SP0B work?

First have the fault memory read out and enclose the log. Then disconnect the battery and afterwards remove the control unit. Next create a repair order online and send the unit in well packed. Processing at Airbag24 generally takes 3–4 working days.

This order is prescribed for safety reasons, because the battery must be disconnected before removal.

In our workshop the control unit is checked, defective components are replaced, the crash data erased and a function test carried out. The unit then goes 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 98820-5SP0B get to Airbag24?

Shipping is either by parcel that you post yourself, or by a UPS collection that you book for an extra charge. The return after the repair is handled by Airbag24 via UPS.

Well protected in the carton, together with the printed repair order: that is how the unit reaches us.