Airbag control unit with part number 98820-9HB0A

What does the airbag control unit 98820-9HB0A do?

The airbag control unit 98820-9HB0A belongs to the restraint system (SRS) at Nissan. In an impact it evaluates the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners fire. The system is monitored continuously, and faults appear on the airbag warning light.

The electronics check connections, sensors and the power supply and record any irregularities in the fault memory. This keeps a clear record of what has happened in the system.

After an accident the unit stores crash data and then remains locked. This lock is only lifted by the repair.

Why does the control unit 98820-9HB0A fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Crash data cannot be deleted with a normal diagnostic tool; the fault therefore persists until the unit has been repaired.

Aged components and cold solder joints affect the unit itself, while moisture and corrosion reach the plug connectors from outside. Voltage spikes arise, for example, from a weak battery or when jump-starting.

How can you tell that the 98820-9HB0A is defective?

The airbag warning light in the instrument cluster lights up continuously or intermittently. Accompanying this may be an error message, a lack of contact with the diagnostic tool, and a fault memory that cannot be cleared.

• Airbag warning light that stays on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool without connection to the control unit
• Fault memory that cannot be cleared

With these signs, airbags and seatbelt pretensioners may not deploy in an emergency. The finding must therefore be taken seriously.

Which vehicles is the 98820-9HB0A fitted in?

In the Nissan model the 98820-9HB0A is installed: Nissan Altima L34 Facelift (from 2022).

The list of vehicles follows here.

• Nissan Altima L34 Facelift (from 2022)

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

For the same vehicles, we also repair control units with the part numbers 98820-3TA9C, 98820-9HS9A, 98820-9HS9B.

How does the repair of the 98820-9HB0A work?

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

Airbag24 checks the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. Afterwards your own unit is sent back to the sender.

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 98820-9HB0A get to Airbag24?

You send the unit as a parcel, or book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

Print out the repair order and put it into the parcel; the unit is additionally packed shockproof.