Airbag control unit with part number 98820-9BR0A

What does the airbag control unit 98820-9BR0A do?

The airbag control unit 98820-9BR0A is the central control unit of the restraint system (SRS) for Nissan. It evaluates the signals from the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident, it stores crash data and locks itself.

During driving, the unit checks whether all connected components respond correctly. If it detects a deviation, it reports this via the airbag warning light in the instrument cluster and creates an entry in the fault memory.

Because the decision leaves no time in an emergency, the control unit depends on a stable power supply and intact wiring. This dependence is exactly what makes the electronics prone to defects that appear after some time.

Why does the control unit 98820-9BR0A fail?

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

Crash data is created when the unit registers an accident. It remains stored until Airbag24 erases it during the repair.

The other causes concern the electronics and their surroundings. Components age, solder joints can go cold, and moisture promotes corrosion on the contacts.

Voltage spikes additionally stress the circuits when the battery is weakening or when starting with external power.

How can you tell that the 98820-9BR0A is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through an error message in the instrument cluster, through a lack of connection to the diagnostic tool, or through a fault memory that cannot be erased. Airbags and seatbelt pretensioners may then possibly not deploy in an emergency.

The warning light is the most important sign, because it signals every fault the control unit detects. Have the system checked promptly if it lights up permanently or recurrently.

A diagnostic tool that cannot make contact with the control unit points to the electronics, but the cause may just as well be a plug or a cable. Only evaluating the fault memory shows where the fault lies.

Which vehicles is the 98820-9BR0A fitted in?

The control unit 98820-9BR0A is fitted in these vehicles: Nissan Frontier D40 (2005-2007) and D40 Facelift (2007-2015).

The following list shows the vehicles that are recorded for this part number.

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

For one thing, it is worth comparing: check the part number on the label of the removed unit against this page. This only shows that you have the correct unit in front of you. For another, have the fault memory read out beforehand, because only this log shows whether the control unit itself is defective or whether a plug or a cable is the cause.

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

How does the repair of the 98820-9BR0A work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Then create a repair order online and send in the well-packed unit; processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. After that, your own unit goes back to you. The stated time covers only testing, repairing and checking at Airbag24.

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 98820-9BR0A 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 to you by UPS.

The printed repair order belongs in the parcel, and the unit should be packed shockproof.