Airbag control unit with part number 98820-9BU8D

What does the airbag control unit 98820-9BU8D do?

The airbag control unit 98820-9BU8D is the central control unit of the restraint system (SRS) for Nissan. It analyses the signals from the crash sensors and, in the event of an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

The unit is active at all times, even when no accident has occurred. It monitors sensors, wiring, airbag modules and seatbelt pretensioners and reports any faults it detects via the airbag warning light in the instrument cluster. To do this, it works closely with the sensors and the airbag output stages.

After an accident, it stores crash data and locks itself.

Why does the control unit 98820-9BU8D fail?

With the 98820-9BU8D, the most common cause after an accident is stored crash data, even if no airbag has deployed. Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A standard diagnostic tool cannot erase crash data. Airbag24 removes it as part of the repair.

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

Which of these causes applies in an individual case can only be established by reading out and testing the unit.

How can you tell that the 98820-9BU8D is defective?

A defect in the 98820-9BU8D shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently, along with an error message there. In addition, the diagnostic tool cannot establish a connection to the control unit, or the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. Signs like these therefore justify having the vehicle checked promptly.

Which vehicles is the 98820-9BU8D fitted in?

The control unit 98820-9BU8D is fitted in these vehicles: Nissan Frontier D41 (from 2021).

The overview below shows which vehicles are listed on this page for this control unit.

• Nissan Frontier D41 (from 2021)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98820-9BU8A, 98820-9BU8E, 98820-9BU9B.

How does the repair of the 98820-9BU8D work?

First, have the fault memory of the 98820-9BU8D read out and enclose the log. Then disconnect the battery and only then remove the control unit. Create the repair order online, then pack the unit well and send it in.

Airbag24 checks the unit on the test bench and replaces defective components. Stored crash data is then deleted and a functional test is carried out before your own unit is sent back to you.

Checking, repairing and testing at Airbag24 usually takes 3–4 working days. 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 98820-9BU8D get to Airbag24?

You send the 98820-9BU8D as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the control unit so that it is shock-proof.