Airbag control unit with part number 98820-4HL0A

What does the airbag control unit 98820-4HL0A do?

The airbag control unit 98820-4HL0A forms the control centre of the restraint system (SRS) for Infiniti. It evaluates the signals from the crash sensors and decides in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered.

At the same time, the unit monitors the entire system continuously. If it detects a fault, it reports it via the airbag warning light in the instrument cluster, and the error message appears there as well.

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

Why does the control unit 98820-4HL0A fail?

Most often the cause is crash data stored after an accident, even if no airbag has deployed at all. This data cannot be erased with a normal diagnostic tool. Added to this are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Airbag24 removes the crash data during the repair, so that it no longer resides in the control unit afterwards.

The other causes are less obvious. Components age, solder joints can give way, and moisture or corrosion gradually weakens plug connections.

How can you tell that the 98820-4HL0A is defective?

The airbag warning light in the instrument cluster stays on continuously 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.

If that is the case, the airbags and seatbelt pretensioners may possibly not deploy in an emergency. A prompt check is therefore advisable.

The warning light is a direct message from the control unit itself and not merely a hint from a workshop.

Which vehicles is the 98820-4HL0A fitted in?

The 98820-4HL0A is fitted in these vehicles: Infiniti Q50 V37 (2013-2024).

The vehicles as a list:

• Infiniti Q50 V37 (2013-2024)

Compare the part number on the label of the removed unit with this page, and you will know that it is the correct unit. That comparison says no more than that. Also read out the fault memory, because only the log shows whether the control unit is defective or whether a connector or cable is behind the fault.

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

How does the repair of the 98820-4HL0A work?

Processing at Airbag24 usually takes 3–4 working days. Beforehand you read out the fault memory, attach the log and disconnect the battery. Only then do you remove the control unit, create the repair order online and send the unit in well packed.

Inside the company, the unit is first checked on the test bench, then defective components are repaired. Crash data is erased, and a function test concludes the work. This time frame applies only to checking, repairing and testing at Airbag24, not to your own steps or the shipment. Your unit then comes 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 98820-4HL0A get to Airbag24?

You ship the unit to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair it comes back to you by UPS.

Pack the printed repair order into the parcel together with the unit, and pack the control unit shock-resistant.