Airbag control unit with part number 98820-5NH0B

What does the airbag control unit 98820-5NH0B do?

The airbag control unit 98820-5NH0B is the control unit of the SRS system for Infiniti. It evaluates the crash sensors, decides in an accident on airbags and seatbelt pretensioners, and monitors the entire system continuously. Faults appear on the airbag warning light.

The sensor circuit is permanently active, and the unit processes its measurements without pause. The evaluation remains operational at all times.

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

Why does the control unit 98820-5NH0B fail?

The most common cause: crash data from an accident, which is stored even without an airbag having deployed. Further causes are also possible: ageing components, cold solder joints, moisture, corrosion and voltage spikes.

A standard diagnostic tool cannot delete crash data. The other causes concern mainly the electronics themselves or their connections:

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

The fault memory shows which cause applies.

How can you tell that the 98820-5NH0B is defective?

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

The light is the most important warning signal, because it indicates every detected fault. If it stays on, have the system checked promptly.

In a defect, airbags and seatbelt pretensioners may not trigger in an emergency. This applies regardless of whether the light comes on only intermittently.

Which vehicles is the 98820-5NH0B fitted in?

The control unit 98820-5NH0B is fitted in these vehicles: Infiniti QX50 J50 (2007-2013) and J50 Facelift (2013-2018).

The recorded vehicles are shown in this list.

• Infiniti QX50 J50 (2007-2013)
• Infiniti QX50 J50 Facelift (2013-2018)

Compare the part number on the label of the removed unit with this page, and then you have the correct unit. Have the fault memory read out beforehand, because it 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 98820-5NY9B, 98820-5UB0A, 988201BA0B, 988201BA0C, 988205NL0B.

How does the repair of the 98820-5NH0B work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the carefully packed unit in.

On the test bench Airbag24 examines the electronics. Defective components are repaired, stored crash data is deleted, and the unit is then checked in a function test.

Processing at Airbag24 usually takes 3–4 working days. This time figure applies only to checking, repairing and testing there. Afterwards 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 98820-5NH0B get to Airbag24?

For the control unit 98820-5NH0B there are two options: you send it in as a parcel, or you book a UPS collection for an extra charge. After the repair it comes back by UPS.

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