Airbag control unit with part number 95910-4A301

What is the function of the airbag control unit 95910-4A301?

The airbag control unit 95910-4A301 is the central control module of the occupant protection system for the Hyundai H-1 and Starex of the A1 generation. It processes signals from crash sensors to deploy airbags and pretensioners in the event of a collision, and permanently stores relevant accident data (crash data) in its internal memory.

As the brain of the passive safety system, this control unit continuously monitors all connected components, including front and side airbags, knee airbags, seatbelt pretensioners, as well as their associated acceleration and pressure sensors. It ensures that the system responds flawlessly within milliseconds in an emergency.

A key function is storing crash data. Once the control unit triggers deployment, this information is permanently saved in memory. This record serves accident reconstruction purposes but simultaneously locks the control unit against further use, even if the deployed components have been replaced.

Why does the control unit 95910-4A301 fail?

The most common cause of failure for the control unit 95910-4A301 is the storage of crash data after an accident. Another frequent reason is internal electronic malfunctions, indicated by error code B1620 (internal fault), requiring component-level repair. External factors such as moisture can also lead to defects.

After an accident involving deployed airbags or seatbelt pretensioners, the control unit locks itself. The airbag warning light remains illuminated even after visible damage has been repaired and components replaced. Clearing this crash data requires specialized equipment and forms the core of many repairs.

An internal hardware fault is also a typical cause. Individual electronic components, such as processors or memory chips on the circuit board, may fail, often rendering the control unit inaccessible via the diagnostic interface and triggering error code B1620.

In rarer cases, improper past repair attempts or moisture ingress can damage the sensitive electronics, resulting in total failure. It’s important to note that there are related and partially interchangeable part numbers—such as 95900-4A301, 959004A401, and 959004A410—which are frequently installed in the Starex A1 series. For the newer TQ model range, another variant exists, such as 95910-4H500.

How do you recognize a defect in the 95910-4A301?

A defect in the control unit 95910-4A301 primarily manifests as the airbag warning light remaining constantly illuminated on the dashboard. Another clear symptom is the lack of communication with the control unit when a workshop attempts to read the fault memory using a diagnostic tool. Often, error code B1620 (internal fault) appears.

The most obvious sign is the red airbag indicator light, which fails to extinguish after starting the vehicle—indicating a serious, safety-relevant system fault. Such a vehicle would not pass a mandatory inspection.

During diagnostics at a workshop, the issue often becomes apparent when the control unit becomes unresponsive. The diagnostic tool cannot establish a connection to read or clear faults. If a connection is possible, the specific error code B1620 is frequently recorded, directly pointing to an internal malfunction of the control unit.

Following an accident, the warning light also stays on because the crash data stored in the control unit prevents reactivation of the system—even after all deployed airbags and seatbelt pretensioners have been professionally replaced.

In which vehicles is the control unit 95910-4A301 installed?

The airbag control unit with part number 95910-4A301 is specifically designed for the Hyundai H-1 and Hyundai Starex models of the A1 series. At Airbag24, we service this component for both the first-generation models and their facelift variants, particularly those equipped with the 2.5 CRDi engine.

At Airbag24, this control unit is refurbished for the following models:

Hyundai H-1 A1 (1997–2003) and the A1 facelift (2003–2007)

Hyundai Starex A1 (1997–2003) and the A1 facelift (2003–2007)

Compatibility extends mainly to the van and minibus variants of these model lines produced up to 2007.

How does the repair of the 95910-4A301 proceed?

After removal and shipment to Airbag24, the control unit 95910-4A301 undergoes thorough analysis. Depending on the nature of the fault, stored crash data is professionally erased, or defective electronic components on the circuit board are replaced. Following successful repair and final testing, the device is fully functional again.

The process at Airbag24 is designed for efficiency and safety. First, the unit undergoes an initial diagnostic test to precisely identify the root cause of the fault—whether it’s stored crash data or a hardware defect such as error B1620.

The actual repair involves securely erasing the crash data using specialized programming tools or replacing defective components on the circuit board. Afterwards, the refurbished control unit undergoes a comprehensive functional test to ensure it meets the manufacturer’s specifications.

The repaired control unit performs just like a new part and can be directly reinstalled in the vehicle (plug-and-play). No reprogramming is required. We offer 2 years' statutory liability for defects on all repairs.