Airbag control unit with part number 98820-4FV0A

What does the airbag control unit 98820-4FV0A do?

Control unit 98820-4FV0A is the SRS control unit of Nissan, that is, the central evaluation unit of the restraint system. It processes the signals from the crash sensors, decides within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and checks the system constantly. After an accident it stores crash data and locks itself.

If the unit detects a fault, it shows this via the airbag warning light in the instrument cluster. The decision to trigger takes place inside the unit itself.

Why does the control unit 98820-4FV0A fail?

Most often control unit 98820-4FV0A fails because of stored crash data that remains after an accident, even if no airbag has triggered. A normal diagnostic tool does not erase it. Aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes also play a role.

The unit keeps the crash data, regardless of whether seatbelt pretensioners or airbags have triggered.

The other causes develop over a longer period: components age, solder joints become brittle, and moisture attacks the contacts. Voltage spikes, such as those from a weak battery or after jump-starting, put strain on the electronics.

How can you tell that the 98820-4FV0A is defective?

The airbag warning light in the instrument cluster, which lights up permanently or only intermittently, is a clear sign of a defect in the 98820-4FV0A. In addition there may be a fault message in the instrument cluster, a diagnostic tool without a connection to the control unit, and a fault memory that cannot be cleared.

While these signs persist, airbags and seatbelt pretensioners may not trigger in an emergency.

The diagnostic tool then shows which faults are stored.

Which vehicles is the 98820-4FV0A fitted in?

Control unit 98820-4FV0A is fitted in these vehicles: Nissan Sylphy B17 (from 2012). The part number 98820-4FV0A on the unit remains the decisive reference.

The vehicle details in full:

• Nissan Sylphy B17 (from 2012)

A comparison of the part number on the label with this page ensures that the unit is the right one, but it does nothing more. Only a fault memory read out beforehand shows 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 28556-3RA0A, 28556-3RB0A, 28556-3RC0A, 28556-3RD0B, 28556-3RF0B, 28556-3RL0A.

How does the repair of the 98820-4FV0A work?

First have the fault memory read out and enclose the log, then disconnect the battery. Then remove control unit 98820-4FV0A, create a repair order online and send the unit off well packed. At Airbag24, processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards your own unit 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 98820-4FV0A get to Airbag24?

You send control unit 98820-4FV0A in as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

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