Airbag control unit with part number 98820-4HD0A

What does the airbag control unit 98820-4HD0A do?

In the restraint system (SRS) of Infiniti, the airbag control unit 98820-4HD0A is the central unit. From the crash sensors it calculates, within milliseconds, which airbags and seatbelt pretensioners are triggered in an accident.

It monitors the system without interruption and shows faults via the airbag warning light.

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

Why does the control unit 98820-4HD0A fail?

The most common cause is stored crash data, even if no airbag was triggered in an accident. A normal diagnostic tool cannot delete it. Other causes are aged components, cold solder joints, moisture and corrosion, as well as voltage spikes.

Without targeted deletion, the crash data stays in the unit. Airbag24 removes it during the repair.

The other triggers concern the electronics. Components lose reliability as they age, solder joints can go cold, and moisture and corrosion disturb the contact on plugs.

Voltage spikes arise, for example, from a weak battery or jump-starting.

How can you tell that the 98820-4HD0A is defective?

If the airbag warning light in the instrument cluster lights up permanently or intermittently, there is a problem. Accompanying it, the instrument cluster reports a fault, the diagnostic tool cannot reach the control unit, and the fault memory remains.

If so, airbags and seatbelt pretensioners may possibly not trigger in an emergency. An examination of the system is therefore indispensable.

The warning light is thus a direct indication of the fault in the system.

Which vehicles is the 98820-4HD0A fitted in?

Vehicles with the 98820-4HD0A from Infiniti are these: Infiniti Q50 V37 (2013-2024).

The vehicle list follows below:

• Infiniti Q50 V37 (2013-2024)

Comparing the part number on the label with this page only tells you that it is the right unit. Whether the control unit is defective, or whether a plug or cable is causing the fault, is shown only by reading out the fault memory, which you arrange beforehand.

For the same vehicles, we also repair control units with the part numbers 988206HE0A, K8820-4HL0A.

How does the repair of the 98820-4HD0A work?

First have the fault memory read out and enclose the log. Then disconnect the battery and afterwards remove the control unit. After that, create the repair order online and send the unit off. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit, replaces defective components, deletes the crash data and carries out a function test.

Afterwards your own 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 98820-4HD0A get to Airbag24?

The unit comes to Airbag24 either as a parcel or with a UPS collection that you book for an extra charge. The return after the repair is made by UPS.

The printed repair order goes into the parcel. The packaging must protect the unit against shocks.