Airbag control unit with part number 98820-4HA0B

What does the airbag control unit 98820-4HA0B do?

The airbag control unit 98820-4HA0B controls the restraint system (SRS) of Nissan. It evaluates the signals from the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and indicates faults via the airbag warning light.

The unit checks the sensors, the wiring and the activation of the airbags continuously while the ignition is switched on. A detected deviation is stored in the fault memory.

After an accident it stores crash data and locks itself.

Why does the control unit 98820-4HA0B fail?

Most often the cause is crash data that stays stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot remove it.

Aged electronic components also play a role. Cold solder joints develop over time, and moisture and corrosion attack the plug connections.

Voltage spikes can also be a cause. A weak battery or a jump start can produce such spikes, and the electronics react sensitively to them.

How can you tell that the 98820-4HA0B is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and a fault message also appears in the instrument cluster. In addition, the diagnostic tool cannot connect to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The light is the warning signal the car gives itself. A defect is thus indicated and does not remain hidden.

If you notice these signs, have the system checked promptly and the fault memory read out.

Which vehicles is the 98820-4HA0B fitted in?

The control unit 98820-4HA0B is fitted in these vehicles: Nissan Skyline V37 (2014-2017) and V37 Facelift (from 2017).

This overview lists the vehicles to which the part number belongs.

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

Separate steps help with the assignment. First, compare the part number on the label of the removed unit with this page, which only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only then will it show whether the control unit is defective or whether a plug 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 98820-4HA0B work?

Airbag24 usually processes the unit within 3–4 working days, covering inspection, repair and function test.

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the unit. Then create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function test. Afterwards 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 98820-4HA0B get to Airbag24?

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

Put the printed repair order in the parcel and pack the unit shock-proof. A sturdy box is sufficient.