Airbag control unit with part number 98820 3L305

What does the airbag control unit 98820 3L305 do?

The airbag control unit 98820 3L305 coordinates the restraint system (SRS) of Nissan. It reads the crash sensors and decides in a crash which airbags and seatbelt pretensioners are triggered. It reports faults via the airbag warning light, and after an accident it stores crash data and locks itself.

Evaluation runs continuously in the background. In doing so the unit checks whether sensors, wiring and trigger units deliver plausible values.

Why does the control unit 98820 3L305 fail?

Crash data remaining in memory after an accident are the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot delete them. In addition, aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes come into question.

The other causes concern the electronics themselves and their connections. Voltage spikes arise, for example, from a weak battery or from a jump start.

How can you tell that the 98820 3L305 is defective?

The airbag warning light in the instrument cluster lights up continuously or intermittently, an error message appears in the instrument cluster, and the diagnostic tool gets no connection to the control unit. Also, the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then possibly fail to deploy in an emergency.

The light is a signal to which you should react promptly with a check.

Which vehicles is the 98820 3L305 fitted in?

The 98820 3L305 is fitted in these vehicles: Nissan Almera N15 Facelift (1998-2000) and N15 (1995-1998).

These vehicles are recorded for this part number:

• Nissan Almera N15 Facelift (1998-2000)
• Nissan Almera N15 (1995-1998)

Check the part number on the label of the removed unit against this page; that shows you that it is the right unit, and the comparison shows no more than that. The fault memory, on the other hand, reveals whether the control unit is defective or a plug or cable is the cause. Have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 28556 3N705, 28556 9F105, 285561N900, 98820 3L300 G, 98820-3L300, 9882031805Y.

How does the repair of the 98820 3L305 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 unit in well packed. For testing, repair and checking, Airbag24 generally needs 3–4 working days.

Airbag24 places the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function test. Then your own unit 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 3L305 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair you receive it back from Airbag24 by UPS.

The printed repair order goes into the parcel, and the unit must be packed shock-resistant.