Airbag control unit with part number 98820-5NM0B

What does the airbag control unit 98820-5NM0B do?

The SRS control unit 98820-5NM0B is the evaluation unit for the restraint system of Infiniti. It assesses the signals from the crash sensors and, in the event of an accident, triggers the airbags and seatbelt pretensioners in a targeted way. After an accident it stores crash data and locks itself.

While driving, monitoring runs continuously. If a fault occurs, the unit reports it via the airbag warning light in the instrument cluster.

Why does the control unit 98820-5NM0B fail?

The most common cause is crash data stored after an accident, even where no airbag was deployed. Other possible causes include aged electronic components, cold solder joints, moisture at plug connectors and voltage spikes. During the repair of the 98820-5NM0B, Airbag24 deletes the crash data.

A normal diagnostic tool cannot delete crash data, which is why this is done at Airbag24.

Aged electronic components and cold solder joints can impair the function.

Moisture and corrosion at plug connectors affect the contact, and voltage spikes, for example from a weak battery or a jump start, place additional strain on the electronics.

How can you tell that the 98820-5NM0B is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. A fault message may also appear in the instrument cluster, the diagnostic tool finds no connection to the control unit 98820-5NM0B, and the fault memory cannot be cleared.

Taken together, these symptoms indicate a fault in the restraint system. They do not all have to occur at the same time for the finding to be taken seriously.

While the fault persists, airbags and seatbelt pretensioners may fail to deploy in an emergency. A finding of this kind should therefore be checked promptly.

Which vehicles is the 98820-5NM0B fitted in?

The 98820-5NM0B is fitted in these Infiniti vehicles: Infiniti QX50 J50 (2007-2013) and J50 Facelift (2013-2018). The list is based on the assignment that Airbag24 holds for this part number.

You will find the vehicles for this part number in this overview:

• 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 you will know that you have the right unit. Whether the control unit itself is defective, or a connector or cable is the cause, is only answered by the fault memory. Have it read out before removal.

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 98820-5NM0B work?

First have the fault memory read out and include the log. Then disconnect the battery and only then remove the control unit 98820-5NM0B. Processing at Airbag24 takes 3–4 working days.

Then create a repair order online and send in the well-packed unit.

At Airbag24 the team checks the unit on the test bench, replaces defective components and deletes stored crash data. A function test follows before your own unit is sent back.

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 98820-5NM0B get to Airbag24?

You send the control unit 98820-5NM0B as a parcel, or you book a UPS collection for an extra charge. After the repair, UPS returns the unit to your address.

Include the printed repair order with the parcel, and make sure the packaging is shock-resistant.