Airbag control unit with part number 98820-5NS0B

What does the airbag control unit 98820-5NS0B do?

The airbag control unit 98820-5NS0B controls the restraint system (SRS) of Infiniti. From the signals of the crash sensors, it determines which airbags and seatbelt pretensioners are triggered in an accident within fractions of a second, and it monitors the system continuously. It reports faults via the airbag warning light.

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

Why does the control unit 98820-5NS0B fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a standard diagnostic tool cannot erase it. Other causes are:

• ageing electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or jump-starting

Which of these causes applies can only be determined by reading the fault memory. Without this check, it is not possible to say whether the unit or a connection is affected.

How can you tell that the 98820-5NS0B is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The warning light is therefore the most important warning sign, and a permanently lit indicator should not simply be ignored.

Which vehicles is the 98820-5NS0B fitted in?

The control unit 98820-5NS0B is fitted in these vehicles: Infiniti QX50 J50 (2007-2013) and J50 Facelift (2013-2018).

The following list shows the models that are recorded in our data for this part number.

• 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; that only confirms that it is the right unit. Also have the fault memory read out beforehand, because only the log shows whether the control unit is defective or 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 98820-5NS0B work?

First have the fault memory read out, then disconnect the battery and remove the unit. Then create a repair order online and send the unit in. At Airbag24, checking, repairing and testing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases crash data and carries out a function test before your own unit is sent back 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 98820-5NS0B get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge, and after the repair Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the control unit so that it is shockproof.