Airbag control unit with part number 98820 BH20A

What is the function of the airbag control unit 98820 BH20A?

The airbag control unit with part number 98820 BH20A is the central control module for the occupant protection system in the Nissan Note E11 (2005–2013). It is responsible for monitoring all relevant sensors, evaluating crash data, and ensuring the precise, timely deployment of airbags and seatbelt pretensioners.

As the brain of the passive safety system, this module continuously processes data from acceleration and yaw rate sensors. In the event of a collision, it determines within milliseconds which restraint systems need to be activated to provide optimal protection for occupants.

In addition, the control unit performs a self-test every time the vehicle is started and constantly monitors the functionality of all connected components, such as airbag modules, seatbelt pretensioners, and sensors. Any detected fault is immediately indicated by the illumination of the airbag warning light on the instrument panel.

Why does the airbag control unit 98820 BH20A fail?

The most common cause of failure for the 98820 BH20A control unit is the storage of crash data after an accident. Additionally, internal electronic malfunctions—such as issues with memory chips or other components on the circuit board—can lead to operational failures that make repair unavoidable.

Even after a collision, including low‑intensity impacts where the airbags did not deploy, the control unit may become internally locked. These entries, known as “crash data,” prevent further use of the module and must be professionally reset to restore full functionality of the safety system.

Another potential source of failure is age‑related degradation of electronic components. Such deterioration can result in internal faults that manifest as specific diagnostic trouble codes in the fault memory, potentially disrupting communication with the device.

It’s important to note that this control unit is also known under alternative part numbers such as 988209U10A, 285001909, 98820-3VC0A, and 988209U30A. The defects and symptoms are typically identical across these variants.

How do you recognize a defect in the 98820 BH20A?

A defective airbag control unit 98820 BH20A primarily manifests as a permanently or intermittently illuminated airbag warning light on the dashboard. Often, the fault memory cannot be cleared, or communication between the diagnostic tool and the control unit becomes impossible.

The most obvious sign is the active airbag warning light, which fails to extinguish after starting the engine, indicating a persistent, safety‑critical fault in the system. In some cases, the light may flash irregularly before going out again.

During a workshop diagnosis, it often becomes apparent that the control unit is no longer responsive. The scan tool cannot establish a connection, complicating troubleshooting and strongly suggesting an internal malfunction within the module itself.

When diagnostic codes are read, specific entries such as B1014, B1015, B1052, B1059, and B1139 directly point to an internal fault in the control unit. These codes indicate problems that cannot be resolved simply by replacing external components.

In which vehicles is the 98820 BH20A installed?

The airbag control unit with part number 98820 BH20A is specifically designed for various model series of the first‑generation Nissan Note (E11). At Airbag24, we repair this module for all applicable model years and facelift variants of this series.

Specifically, this control unit is used in the following Nissan Note models and generations:

Nissan Note E11 (model years 2005–2007)

Nissan Note E11 1st Facelift (model years 2007–2009)

Nissan Note E11 2nd Facelift (model years 2009–2013)

A thorough preliminary diagnosis is essential to confirm that the fault lies within the control unit itself, rather than in peripheral components like wiring or sensors. Verifying the part number on the removed unit provides final assurance.

How does Airbag24 handle repairs of the 98820 BH20A?

Repairs at Airbag24 begin with the submission of the removed control unit. Following a detailed technical analysis on specialized test benches, restoration involves replacing faulty components or erasing crash data, followed by a final functional test.

First, a professional diagnosis at a qualified workshop is indispensable to rule out other potential sources of failure. If the defect is confirmed to originate in the control unit, it is carefully removed and securely packaged for shipment to Airbag24. Accompanying diagnostic reports help expedite the process.

Upon receipt, our technicians inspect the unit and pinpoint the exact cause of the fault. Depending on the nature of the issue, stored crash data is erased, or defective electronic components on the circuit board are replaced with new, high‑quality parts.

The repaired control unit is then thoroughly tested to ensure full functionality. After repair, it performs just like a new part. We provide 2 years' statutory liability for defects on every repair performed. In exceptional cases, such as moisture damage or previous improper repair attempts, the process may differ.