Airbag control unit with part number 98820-4HA0A

What does the airbag control unit 98820-4HA0A do?

The airbag control unit 98820-4HA0A forms the control centre of the restraint system (SRS) for Nissan. It checks the signals from the crash sensors, decides within milliseconds in an impact whether airbags and seatbelt pretensioners are triggered, and monitors the system permanently.

If the system detects a fault, the airbag warning light shows it.

After an accident the unit stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit 98820-4HA0A fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. Aged components, cold solder joints, moisture and corrosion, and voltage spikes are also possible.

Further causes in detail:

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

Airbag24 removes the crash data during the repair. A normal diagnostic tool cannot do this.

How can you tell that the 98820-4HA0A is defective?

The airbag warning light in the instrument cluster stays on permanently or comes on intermittently. In addition a fault message appears, the diagnostic tool does not find the control unit, and a fault memory cannot be cleared.

If the control unit is affected, airbags and seatbelt pretensioners may not trigger in an emergency. This light should therefore not be ignored.

If the fault only occurs intermittently, reading out the fault memory helps, because it shows the stored messages.

Which vehicles is the 98820-4HA0A fitted in?

The list serves as a guide. The airbag control unit 98820-4HA0A is fitted in these vehicles: Nissan Skyline V37 (2014-2017) and V37 Facelift (from 2017).

The following models are recorded in our documents:

• Nissan Skyline V37 (2014-2017)
• Nissan Skyline V37 Facelift (from 2017)

First compare the part number on the label of the removed unit with this page; this way you can see that you have the correct unit. Also have the fault memory read out beforehand: only this finding shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 25348-4AN0A, 98820-4HD0A, 988206HE0A.

How does the repair of the 98820-4HA0A work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit; next create the repair order online and send in the well-packed unit. Airbag24 checks it on the test bench, repairs defective components, deletes stored crash data and carries out a function test.

Keep to this order, because safety when working on the airbag system depends on it.

At Airbag24, processing 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 98820-4HA0A get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-resistant.