Airbag control unit with part number 98820-9BU9B

What does the airbag control unit 98820-9BU9B do?

The airbag control unit 98820-9BU9B forms the switching point of the restraint system (SRS) in Nissan. It processes the signals from the crash sensors, decides within milliseconds in an accident on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster. This way the state of the system remains traceable for you.

After an accident, the control unit stores crash data and locks itself.

Why does the control unit 98820-9BU9B fail?

Crash data stored in control unit 98820-9BU9B after an accident is the most common cause, even if no airbag was triggered. This data cannot be erased with a normal diagnostic tool. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

An accident in which no airbag was triggered can still leave crash data behind. The control unit stores it regardless of whether an airbag fired.

The other causes mainly concern the electronics themselves. Components age, solder joints can go cold, and moisture with corrosion attacks plug connections. Voltage spikes, for example from a weak battery or jump-starting, also strain the electronics.

How can you tell that the 98820-9BU9B is defective?

A defect in control unit 98820-9BU9B shows up as the airbag warning light, as fault messages in the instrument cluster, and as a diagnostic tool that cannot establish a connection. A fault memory that cannot be cleared also indicates a problem.

• Airbag warning light permanently or intermittently on
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may fail to trigger. Take such signs seriously and have the system checked.

Which vehicles is the 98820-9BU9B fitted in?

The control unit 98820-9BU9B is fitted in these vehicles: Nissan Frontier D41 (from 2021). Use the list to check whether your model is affected.

The list covers the vehicles known to us for this control unit.

• Nissan Frontier D41 (from 2021)

Comparing the part number on the label of the removed unit with this page only shows that it is the right unit. Whether the control unit is defective is determined only by reading out the fault memory. Have this done before removal, because a plug or cable may also be the cause.

For the same vehicles, we also repair control units with the part numbers 98820-9BU8A, 98820-9BU8D, 98820-9BU8E.

How does the repair of the 98820-9BU9B work?

For the repair of the 98820-9BU9B, first have the fault memory read out and attach the log. Then disconnect the battery before removing the control unit, and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Then pack the unit well and send it in. The sequence is mandatory because it serves safety.

At Airbag24, we check the unit on the test bench, renew defective components, erase the stored crash data and carry out a function test. Your own unit is then returned 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 98820-9BU9B get to Airbag24?

You send control unit 98820-9BU9B to us as a parcel, or you book a UPS collection for an extra charge. Airbag24 then sends the repaired unit back to you by UPS.

The printed repair order must be included in the parcel. The unit also needs shock-resistant packaging.