Airbag control unit with part number 959004A410

What is the function of the airbag control unit 959004A410?

The airbag control unit with part number 959004A410 is the central control module of the occupant restraint system (SRS) in the Hyundai Starex A1. It processes data from acceleration and crash sensors and, within milliseconds, decides whether to deploy airbags and seatbelt pretensioners to provide optimal protection for occupants in the event of a collision.

As the brain of the passive safety system, this module continuously monitors all connected components, including the various airbags, seatbelt pretensioners, seat occupancy detection, and external crash sensors. It performs a self-test every time the vehicle is started, ensuring that the entire system is ready for operation.

If a fault is detected in any component or an internal defect occurs within the control unit itself, the module illuminates the SRS warning light on the instrument panel. This alerts the driver that the restraint system may be inoperative or only partially functional, necessitating immediate inspection at a qualified workshop.

Why does the control unit 959004A410 fail?

A failure of the control unit 959004A410 is often caused by stored crash data following a collision, which locks the module. Another major cause is internal hardware defects, where electronic components on the circuit board—such as memory chips, processors, or ignition‑circuit output stages—fail. Cold solder joints are also a well‑known issue.

The most common reason for a persistently illuminated airbag warning light after a crash is crash data stored in the EEPROM or flash memory. The control unit marks itself as “exhausted” and locks the system, even if the airbags and seatbelt pretensioners have been replaced. Professional repair can remove this lock and reset the device.

Another typical fault is the error code “Airbag control unit defective / internal error.” This indicates hardware damage on the circuit board. Possible causes include age‑related wear of SMD components, microcracks caused by vibration or thermal stress, and cold solder joints at connectors or power components.

Communication problems, where the control unit becomes unresponsive via the diagnostic interface (OBD), also point to a severe internal defect. These may result from a failure of the CAN transceiver or the internal power supply.

This control unit is part of a family that includes closely related OEM part numbers 95900-4A301, 95910-4A301, and 95900-4A401. These often exhibit identical fault patterns and can likewise be repaired.

How do you recognize a defect in the 959004A410?

The primary sign of a defect in the 959004A410 is the permanently illuminated airbag or SRS warning light on the dashboard. Additional symptoms include specific fault codes in the fault memory indicating an internal control unit error, or complete inability to communicate with the module during a diagnostic query.

The most obvious symptom is the continuously lit airbag warning light. It does not turn off after starting the engine, signaling a serious, safety‑relevant system fault.

When reading the fault memory with an appropriate diagnostic tool, typical errors such as “control unit defective,” “component defective,” or “internal error” appear. After a crash, the entry “crash data stored” is a clear indication of a locked module.

In severe cases, communication with the control unit may become impossible. The diagnostic tool reports that the SRS module is unresponsive, suggesting a total failure of the internal electronics.

It is important to inspect the vehicle’s peripheral components before removing the control unit. Faulty wiring, corroded connectors, or incorrect cabling to the airbags and seatbelt pretensioners can produce similar symptoms and must be ruled out as potential sources of the problem.

In which vehicles is the control unit 959004A410 installed?

The airbag control unit with part number 959004A410, along with its related variants, is designed specifically for the Hyundai Starex. At Airbag24, we professionally repair these control units for the first generation of the model, covering both pre‑facelift and facelift versions.

At Airbag24, we offer expert repair services for the 959004A410 and its compatible variants for the following models:

Hyundai Starex A1 (model years 1997–2003)

Hyundai Starex A1 Facelift (model years 2003–2007)

How is the 959004A410 professionally repaired?

Professional repair of the 959004A410 at Airbag24 is a multi‑step process. It begins with a thorough incoming inspection, followed by elimination of the root cause at the component level—such as clearing crash data or replacing faulty parts. A final functional test on a test bench ensures the quality of the repair.

After being sent to Airbag24, the control unit first undergoes a visual inspection for external damage such as corrosion or signs of burning. It is then opened so that the circuit board can be examined microscopically for cold solder joints, microcracks, or defective components.

The actual repair is carried out at the component level. Stored crash data is securely erased from the EEPROM or flash memory. Defective parts like voltage regulators, ignition‑circuit drivers, or protection diodes are replaced with new, high‑quality components. Critical solder joints are professionally re‑soldered to ensure a durable connection.

Before being returned, each repaired control unit undergoes an intensive final test on a specially designed test bench. Here, all functions—especially the activation of the ignition circuits and communication—are simulated under realistic conditions to confirm full operational capability.

This repair process is not only a cost‑effective alternative to an expensive new part but also sustainable. We provide 2 years' statutory liability for defects on all repairs performed.