Airbag control unit with part number 98820-9BJ0B

What does the airbag control unit 98820-9BJ0B do?

For Nissan, the airbag control unit 98820-9BJ0B is the control unit of the restraint system (SRS). It evaluates the crash sensors, determines in an emergency within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. Faults are shown via the airbag warning light.

The control unit applies the sensor measurements according to fixed rules. This makes it clear when an accident has occurred and when it has not.

After an accident, the unit stores crash data in its memory and locks itself. The data remains in the memory and feeds into fault finding.

Why does the control unit 98820-9BJ0B fail?

The most common cause is crash data stored after an accident; common devices cannot remove it. Besides this, other causes come into consideration, above all ageing electronics, dry solder joints, moisture and corrosion, and voltage spikes.

Besides the crash data, other causes come into consideration:

• Electronics whose components age over time
• Solder joints that make only a wobbly contact
• Plug connections into which moisture penetrates or on which corrosion forms
• Voltage spikes from the vehicle electrical system, for example with a weak battery or a jump start

When narrowing down the fault, look at the crash data first.

How can you tell that the 98820-9BJ0B is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. A fault message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared are added. Then airbags and seatbelt pretensioners may fail to deploy in an emergency.

The light is the most visible sign of a fault. Permanent light or intermittent illumination therefore calls for the same attention.

If the control unit does not respond, a targeted fault search is needed before the cause can be narrowed down.

Which vehicles is the 98820-9BJ0B fitted in?

The control unit 98820-9BJ0B is fitted in these vehicles: Nissan Frontier D40 (2005-2007) and D40 Facelift (2007-2015). A list of the models follows so that you can check the assignment.

Here is the list at a glance:

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

Carry out the label comparison with this page to recognise the correct unit. Have the fault memory read out before removal, because only this result shows whether the control unit is defective or a line and a connector are the cause.

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

How does the repair of the 98820-9BJ0B work?

First have the fault memory read out and place the log in the parcel, then disconnect the battery and only afterwards remove the control unit. Create the repair order online, then pack and send the unit. Airbag24 tests it on the test bench, repairs defective components, clears crash data and carries out a function test.

The sequence serves your safety and must therefore be followed.

For processing at Airbag24, a duration of 3–4 working days applies as a rule.

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 98820-9BJ0B get to Airbag24?

You send the unit to Airbag24 as a parcel, or you book a UPS collection for an extra charge. UPS handles the return after the repair.

The printed repair order belongs in the parcel, and the packaging protects the control unit against impact.