Airbag control unit with part number 98820-5NS1B

What does the airbag control unit 98820-5NS1B do?

The airbag control unit 98820-5NS1B controls the restraint system in Infiniti vehicles. From the signals of the crash sensors it calculates within milliseconds which airbags and seatbelt pretensioners fire in an accident, and it monitors all functions continuously. Detected faults appear on the airbag warning light.

Even between events the control unit is not idle. It checks voltages, wiring and the connection to the seatbelt pretensioners and airbag modules. If it detects a deviation, it stores it and reports it to the driver.

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

Why does the control unit 98820-5NS1B fail?

The most common cause is crash data stored in the unit after an accident, even if no airbag has fired; a normal diagnostic tool cannot erase it. Besides this, aged electronic components, cold solder joints, moisture and corrosion on plugs, as well as voltage spikes, for example from a weak battery or jump-starting, are possible causes.

Crash data arises as soon as the control unit registers an accident, even if the airbags did not fire.

The other causes act gradually. Components age, solder joints can go cold, and moisture causes corrosion on the plugs. Voltage spikes put further strain on the electronics, especially with a weak battery or when a jump-start is connected.

How can you tell that the 98820-5NS1B is defective?

The airbag warning light in the instrument cluster stays on permanently or from time to time, and the instrument cluster shows an error message. If no connection to the diagnostic tool can be made, or the fault memory cannot be cleared, a defect is likely. In this case, airbags and seatbelt pretensioners may fail to fire in an emergency.

The light indicates the condition of the entire system. If it does not go out after the ignition is switched on, have the system checked.

The error message in the instrument cluster supplements the light and tells you that the system is faulty.

Which vehicles is the 98820-5NS1B fitted in?

The control unit 98820-5NS1B is fitted in Infiniti vehicles, among others: Infiniti QX50 J50 (2007-2013) and J50 Facelift (2013-2018). The part number on the removed unit provides the reliable comparison.

The overview below shows the vehicles for which this unit is held in the database.

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

Have the fault memory read out before removal. The protocol shows whether the control unit itself is defective or whether a plug or a cable is the cause. The label comparison with this page then only confirms that you have the right unit.

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 98820-5NS1B work?

First you have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit, create a repair order online and send in the well-packed unit. Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and runs a function test. Processing usually takes 3–4 working days.

Airbag24 replaces defective components, erases stored crash data and carries out a function test. Processing usually takes 3–4 working days.

The order of the steps is mandatory for safety reasons. After that, the unit goes 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 98820-5NS1B get to Airbag24?

You send the control unit to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

Put the printed repair order into the parcel and pack the unit with cushioning to withstand shocks.