Airbag control unit with part number 98820-5SY0A

What does the airbag control unit 98820-5SY0A do?

The 98820-5SY0A is the airbag control unit that controls the restraint system (SRS) of Nissan. It reads the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners are triggered.

The control performs continuous self-checks and records faults in the memory. A fault is indicated by the airbag warning light in the instrument cluster.

After an accident the unit writes crash data and then blocks operation. Only a repair ends this block.

Why does the control unit 98820-5SY0A fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. This data remains in the 98820-5SY0A, because a normal diagnostic tool does not erase it.

Aged components, cold solder joints, and moisture or corrosion at plug connections are also causes. Voltage peaks, for example from a weak battery or a jump start, also count among the triggers.

Airbag24 erases the crash data during the repair.

How can you tell that the 98820-5SY0A is defective?

On the 98820-5SY0A, a defect can show up as the airbag warning light in the instrument cluster, which burns permanently or intermittently. An error message in the instrument cluster can also be present.

• Airbag warning light permanently lit or flickering
• Error message in the instrument cluster
• Diagnostic tool without connection to the control unit
• Fault memory that stays put

If there is no connection to the diagnostic tool or the fault memory stays put, the control unit should be checked. In an emergency, airbags and seatbelt pretensioners could otherwise fail to trigger.

Which vehicles is the 98820-5SY0A fitted in?

The airbag control unit 98820-5SY0A is fitted in these vehicles: Nissan Leaf ZE1 (from 2017).

The list of assigned vehicles follows directly here.

• Nissan Leaf ZE1 (from 2017)

Before you send the unit in, compare the part number on the label of the removed unit with this one. Also have the fault memory read out, so that it is clear whether the control unit or a cable is causing the fault.

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 98820-5SY0A work?

As preparation, read out the fault memory and keep the log ready. Then disconnect the battery, remove the control unit 98820-5SY0A and create a repair order online. Finally, pack the unit and send it in.

Airbag24 places the unit on the test bench, repairs defective components, erases the crash data and tests the function. Processing usually takes 3–4 working days.

Take care not to bend the plugs when pulling them off. 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 98820-5SY0A get to Airbag24?

You hand over the control unit 98820-5SY0A as a parcel or book a UPS collection for an extra charge. The return of the repaired unit is made by UPS.

The printed repair order must be enclosed in the parcel. Pack the unit shockproof.