Airbag control unit with part number 98820-5NN0A

What does the airbag control unit 98820-5NN0A do?

The airbag control unit 98820-5NN0A forms the centre of the restraint system (SRS) of Infiniti in the vehicle. It checks the signals from the crash sensors and decides in a crash within fractions of a second which airbags and seatbelt pretensioners are triggered. It reports faults via the airbag warning light.

This monitoring runs in the background, while you drive and when the car is parked. The unit therefore checks constantly whether the trigger chain remains functional.

After an accident it stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 98820-5NN0A fail?

Crash data from an earlier accident is the most common cause in the 98820-5NN0A, even if no airbag was triggered. A normal diagnostic tool cannot erase it. Other causes include aged components, moist plug connectors and voltage spikes.

Cold solder joints and corrosion at plug connectors are also possible, as are voltage spikes caused by a weak battery or a jump start.

Whether one of these causes applies in the individual case is determined only by the inspection at Airbag24.

How can you tell that the 98820-5NN0A is defective?

In the event of a defect on the 98820-5NN0A, the airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears there. In addition, the diagnostic tool cannot establish a connection to the control unit, or the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then not trigger. Therefore have the system checked promptly when the light comes on.

The light indicates a fault that has been detected. Where it originates is determined only by reading out the fault memory.

Which vehicles is the 98820-5NN0A fitted in?

The control unit 98820-5NN0A is fitted in these vehicles: Infiniti QX50 J50 (2007-2013) and J50 Facelift (2013-2018). Check the part number against your car, because that is more precise than the model name alone.

These models are assigned to the part number:

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

First compare the label on the removed unit with this page; this only confirms that you have the right unit. Have the fault memory read out beforehand, because its contents show whether the control unit is defective or a wire or connector 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 98820-5NN0A work?

Have the fault memory read out and enclose the log with the parcel. Then disconnect the battery and remove the control unit 98820-5NN0A. Next create a repair order online and send the well-packed unit in.

Airbag24 then checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a functional test. Afterwards your unit returns to you.

Processing at Airbag24 usually takes 3–4 working days. 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 98820-5NN0A get to Airbag24?

You send the control unit 98820-5NN0A as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends the unit back by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shock-proof.