Airbag control unit with part number 98820-3RM0A

What is the function of the airbag control unit 98820-3RM0A?

The airbag control unit 98820-3RM0A is the central control module for the entire occupant safety system (SRS) in the Nissan Sylphy B18. It processes signals from crash sensors, deploys airbags and seatbelt pretensioners in the event of a collision, and stores relevant crash data in its internal memory.

As an original OEM component for the Nissan Sylphy B18 series (from model year 2019 onward), this module—based on an Infineon chip—is responsible for monitoring and controlling all safety‑related restraint systems. It continuously communicates with various vehicle sensors to analyze the severity and nature of an impact.

In the event of a serious accident, the control unit sends ignition pulses to the appropriate airbags (e.g., knee airbag) and seatbelt pretensioners. At the same time, all accident‑related data—known as crash data—is permanently stored in the device’s EEPROM, enabling later analysis but also potentially leading to functional lockouts.

Why does the control unit 98820-3RM0A fail?

The most common cause of failure for the control unit 98820-3RM0A is the storage of crash data after a collision. This data puts the module into a locked state. Other causes include electronic defects in internal components such as ICs or age‑related malfunctions.

After an airbag or seatbelt pretensioner has been deployed, the control unit writes an irreversible error record (hard code) into its memory. This safety feature locks the module to prevent further use without professional diagnostics. As a result, the airbag warning light remains illuminated permanently.

Besides this software‑based lockout, hardware faults can also occur. Defective integrated circuits (ICs), cold solder joints, or capacitor issues may likewise lead to failure. Such defects often manifest as complete loss of communication with the vehicle or internal error codes unrelated to an accident.

How do you recognize a fault in the 98820-3RM0A?

A defect in the airbag control unit 98820-3RM0A primarily shows up as a permanently illuminated airbag warning light (SRS lamp) in the instrument cluster. Additionally, it is often impossible to access the control unit via a diagnostic tool (OBD) or read out error codes.

The most noticeable symptom is the persistently lit SRS warning light. It does not turn off after starting the vehicle, clearly indicating a serious malfunction in the restraint system. In this condition, the entire airbag system is disabled and offers no protection in the event of a crash.

Another clear sign is a complete loss of communication. If a workshop attempts to read the fault memory, the diagnostic tool reports that no connection can be established with the airbag control unit. This points to an internal defect within the module.

In which vehicles is the control unit 98820-3RM0A installed?

The airbag control unit with part number 98820-3RM0A is specifically designed for Nissan models. It is mainly used in the Nissan Sylphy B18 series. At Airbag24, we professionally repair this control unit for the listed models.

At Airbag24, we have successfully matched and repaired this part number for the following model:

Nissan Sylphy B18 (model years 2019–present)

How is the control unit 98820-3RM0A professionally repaired?

Professional repair focuses on electronically restoring the original device. The core of the repair involves erasing stored crash data and hard codes through direct EEPROM reprogramming. For hardware defects, faulty components on the circuit board are additionally replaced.

Upon submission to Airbag24, the control unit undergoes a thorough diagnosis. Technicians read the internal fault memory and inspect the hardware for visible damage. The emphasis of the repair lies in addressing the root cause, not just the symptoms.

Using specialized programming tools, a connection is established to the memory chip (EEPROM). The firmware is read out, crash data is removed, and the original, error‑free configuration is restored. This returns the module to a condition close to factory settings. A comprehensive functional test and sealing of the device follow.

Of course, every repair comes with a 12‑month warranty.

What are the benefits of repair?

Repairing the original control unit is up to 70% cheaper than purchasing a new one, which typically costs between €500 and €1,000. Since the original vehicle configuration is preserved, no expensive re‑coding or reprogramming is required at the workshop after installation.

A key advantage is retaining the original coding. The repaired control unit is “plug-and-play” and can be reinstalled immediately, without requiring re‑learning by the vehicle. This saves time and avoids additional workshop costs.

Moreover, repair is a sustainable solution, as it prevents electronic waste and conserves valuable resources. With a 12‑month warranty on the work performed, refurbishment offers a safe and cost‑effective alternative to expensive replacement.

What shipping options are available?

For fast and hassle‑free processing, you can send your removed control unit to Airbag24 or arrange for UPS pickup. Returns are free of charge via UPS Standard, with optional Express delivery—including cash on delivery. Self‑pickup is also available.

For the outbound shipment, you have two options: you can ship the package at your own expense, or conveniently book a UPS pickup from your preferred location.

For returning your repaired control unit, we offer the following options:

Free UPS Standard shipping

UPS Express shipping

UPS Standard shipping with cash on delivery

UPS Express shipping with cash on delivery

Self‑pickup at our premises