Airbag control unit with part number 98820-9BF1A

What does the airbag control unit 98820-9BF1A do?

The airbag control unit 98820-9BF1A controls the restraint system (SRS) of Nissan. It checks the signals from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners within fractions of a second in an accident. After an accident it stores crash data and locks itself.

In addition, the unit monitors the entire system continuously. If it detects a fault, it reports it via the airbag warning light in the instrument cluster, so that you can react.

This monitoring runs in the background while you drive.

Why does the control unit 98820-9BF1A fail?

The most common cause is the crash data stored after an accident. Aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes come on top of this. Airbag24 erases the crash data during the repair.

The data stays in the memory even if no airbag has deployed, and a normal diagnostic tool cannot erase it.

Further causes lie in the electronics themselves. Aged components and cold solder joints can distort signals or interrupt them completely.

Moisture and corrosion at plug connections also belong here, as do voltage spikes, which occur for example with a weak battery or a jump start.

How can you tell that the 98820-9BF1A is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently as soon as a fault is present in the control unit 98820-9BF1A. Accompanying error messages may appear in the instrument cluster, and the diagnostic tool gets no connection to the control unit.

These signs point to a defect:

• The airbag warning light stays on permanently.
• The light comes on only intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool does not find the control unit.
• The fault memory cannot be cleared.

In these cases, airbags and seatbelt pretensioners may fail to deploy in an emergency. Do not rely on the vehicle driving normally.

Which vehicles is the 98820-9BF1A fitted in?

The control unit 98820-9BF1A was fitted in these Nissan vehicles: Nissan Frontier D40 (2005-2007) and D40 Facelift (2007-2015). The details come from our assignment for this part number.

The list gives an overview of the vehicles on record:

• Nissan Frontier D40 (2005-2007)
• Nissan Frontier D40 Facelift (2007-2015)

Compare the part number on the label of the removed unit with this page. That shows you that it is the right unit, but not yet whether it is defective. Therefore have the fault memory read out beforehand, because only this log shows whether the control unit itself is the cause or a plug or cable.

For the same vehicles, we also repair control units with the part numbers 98820 EB01D.

How does the repair of the 98820-9BF1A work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Airbag24 needs 3–4 working days for inspecting, repairing and testing, before the unit goes back to you.

Then create a repair order online and pack the unit well.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test.

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 98820-9BF1A get to Airbag24?

You send the control unit 98820-9BF1A as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

Enclose the printed repair order and pack the unit as shockproof as possible.