Airbag control unit with part number 98820-9HM0A

What does the airbag control unit 98820-9HM0A do?

As the control centre of the restraint system (SRS) of Nissan, the airbag control unit 98820-9HM0A works. It checks the signals from the crash sensors and, in a collision, decides within milliseconds on the triggering of airbags and seatbelt pretensioners.

The unit also constantly checks the function of the system and indicates faults via the airbag warning light.

After an accident it creates crash data and then locks itself.

Why does the control unit 98820-9HM0A fail?

Crash data from an accident is the most common cause, even if no airbag has deployed. On control unit 98820-9HM0A it cannot be erased with a normal diagnostic tool; Airbag24 removes it during the repair. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The fact that a unit fails because of stored data does not mean that the electronics are damaged. That is why a look at the fault memory helps more than any assumption.

The other causes arise from ageing, moisture and voltage. Connections give way over time, and voltage spikes occur, for example, with a weak battery or when jump-starting.

How can you tell that the 98820-9HM0A is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently and indicates a fault in control unit 98820-9HM0A. A fault message in the instrument cluster, no connection to the diagnostic tool and a fault memory that cannot be cleared may additionally occur; in an emergency, airbags and seatbelt pretensioners may then not deploy.

The warning light is not a random signal but a hint given by the control unit itself. You should therefore not ignore it.

Have the fault memory read out as soon as the light comes on, and keep the log.

Which vehicles is the 98820-9HM0A fitted in?

Control unit 98820-9HM0A is fitted in this vehicle type: Nissan Altima L33 (2012-2018). The information is based on the data for this part number.

Here follows the list of vehicles assigned to this part number.

• Nissan Altima L33 (2012-2018)

Compare the part number on the label of the removed unit with this page; that only confirms that you have the right unit. Have the fault memory read out beforehand, because the result shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98820-3TA0B, 98820-3TA9C, 98820-9HN0A, 98820-9HS9A.

How does the repair of the 98820-9HM0A work?

First have the fault memory read out and attach the log. Then disconnect the battery before removing control unit 98820-9HM0A. Next, create the repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is examined on the test bench, defective components are repaired and the stored crash data is erased. A function test follows, after which your own unit is 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 98820-9HM0A get to Airbag24?

You send control unit 98820-9HM0A as a parcel to Airbag24 or book a UPS collection for an extra charge. The return after the repair is made by UPS.

The printed repair order goes into the parcel, and the unit is packed shock-proof.