Airbag control unit with part number 98820-3LW0B

What is the function of the airbag control unit 98820-3LW0B?

The airbag control unit with part number 98820-3LW0B is the central control unit for the occupant safety system (SRS) in the Infiniti Q60 Coupe (CV37). It processes signals from crash sensors, deploys airbags and seatbelt pretensioners in the event of a collision, and stores relevant crash data for later analysis.

As an original OEM component from Infiniti/Nissan, it is precisely matched to the Q60’s vehicle architecture. Its primary task is continuous monitoring of all connected components, such as impact sensors, seat occupancy mats, seatbelt pretensioners, and airbag modules. Upon detecting a collision, the control unit determines within milliseconds which restraint systems must be activated to provide optimal protection for occupants.

At the same time, it serves as a data storage device. After deployment, so‑called crash data are permanently recorded in the unit’s memory. This prevents unintended reuse and ensures that the safety system is professionally inspected and reset following an accident.

Why does the control unit 98820-3LW0B fail?

The most common reason for failure of the 98820-3LW0B control unit is stored crash data after an accident, which blocks further use. Other causes include internal hardware faults on the circuit board leading to error codes such as U1XXX or B1XXX, communication issues on the CAN bus, or physical damage.

After an airbag or seatbelt pretensioner deployment, the control unit locks its memory to ensure safety. This lock cannot be removed simply by clearing the fault memory and requires specialized electronic intervention.

Internal failures are often due to defective electronic components. These can result from aging, but also from external factors such as voltage surges during jump-starts, short circuits, or moisture ingress (water damage). Such damage frequently leads to complete loss of communication.

Problems with the physical connection—such as corroded or broken pins on the connector—can also disrupt CAN‑bus communication and disable the control unit. A professional diagnostic check before repair is therefore essential to pinpoint the exact cause.

How do you recognize a defect in the 98820-3LW0B?

A defect in the 98820-3LW0B control unit primarily manifests as a continuously illuminated or flashing airbag warning light (SRS lamp) in the instrument cluster. Often, communication with the control unit via diagnostic tools (OBD) is no longer possible, complicating troubleshooting and indicating an internal fault.

The illumination of the SRS warning light is the clearest sign. It indicates that the airbag system is not operational and cannot provide protective functions in the event of a crash, rendering the vehicle unsafe for road use.

Another clear symptom is when a workshop using diagnostic tools like TECH2 or other scanners cannot establish communication with the airbag control unit. The fault memory then typically displays messages such as “Control unit defective” or “No communication,” directly pointing to a failure of the unit.

Even after an accident where airbags or seatbelt pretensioners have deployed, the control unit should still be considered defective, as the stored crash data prevent normal operation—even if the warning light could be reset.

In which models is the 98820-3LW0B installed?

The airbag control unit with part number 98820-3LW0B is specifically designed for the Infiniti Q60. At Airbag24, this control unit is repaired exclusively for this model series to restore full functionality of the safety system and guarantee perfect fitment.

Specifically, this component is used in the following vehicles:

Infiniti Q60 Coupe CV37 (model years 2016–2022)

Is repairing the 98820-3LW0B worthwhile?

Repairing the 98820-3LW0B is a highly cost-effective alternative to purchasing a new unit. You save significantly compared to a new part, which can cost up to €750. Additionally, you receive a reconditioned, factory‑reset component backed by 2 years’ statutory liability for defects.

Component‑level repair replaces only the defective parts, drastically reducing costs compared to replacing the entire unit. This approach is not only economical but also more environmentally sustainable.

An additional advantage is that the repaired control unit does not require new coding or programming in the vehicle. Since the original software and vehicle configuration remain intact, it can be put back into service immediately after installation (plug-and-play).

How is the 98820-3LW0B professionally repaired?

At Airbag24, the repair of the 98820-3LW0B follows a standardized process. First, an initial inspection is performed to verify the reported fault. Next, stored crash data is erased, and defective components on the circuit board are replaced with new ones. Final tests ensure full functionality.

After submission to Airbag24, technicians analyze the control unit using specialized software and precision measurement equipment. This not only addresses the obvious issue—such as stored crash data—but also thoroughly examines the entire circuit board for known weaknesses and potential future failure points.

The core of the repair lies in eliminating the root cause of the fault. This includes erasing crash data from the internal memory and replacing faulty electronic components like processors, memory chips, or voltage converters. Following repair, the device is tested on a test bench to simulate proper communication and the correct operation of all outputs.

Airbag24 provides 2 years’ statutory liability for defects on every completed repair, underscoring the quality and durability of the service.