Airbag control unit with part number 3Q959-10110-95256

What is the function of the airbag control unit 3Q959-10110-95256?

The airbag control unit with part number 3Q959-10110-95256 is the central control module of the occupant safety system (SRS) in the Hyundai Sonata EF. It continuously analyzes data from crash sensors and, in the event of a collision, determines whether and which airbags or seatbelt pretensioners need to be deployed to protect occupants.

As the heart of the safety system, this control unit communicates with all relevant sensors and actuators. It monitors the ignition circuits of airbags and seatbelt pretensioners and stores all system-relevant events—including fault codes and crash data—in its internal memory. Proper functionality is critical for the vehicle’s passive safety.

This control unit is also known under equivalent part numbers 3Q959-10110, 95910-3Q110, 95910-38400, 5WK4247, and 95910-4R000, which are likewise used in the Hyundai Sonata EF and related model series.

Why does the control unit 3Q959-10110-95256 fail?

A failure of the control unit 3Q959-10110-95256 is often caused by stored crash data following an accident, which locks the system. Other causes include internal hardware defects in components such as the memory chip (EEPROM), the microcontroller, or the power supply, leading to total failure or communication issues.

One of the most common reasons for repair is the storage of crash data. After a collision, the control unit locks the entire SRS system—even if the mechanical components have already been replaced. An electronic repair can unlock the system by resetting the data stored in memory.

Internal electronic faults are another frequent cause of failure. Defective components on the circuit board—such as voltage regulators, CAN drivers, or logic ICs—can disrupt operation. Overvoltage damage, for example from improper jump-starting or issues with the vehicle battery, can also harm the sensitive electronics.

In rarer cases, corroded connectors or damaged wiring harnesses may lead to misinterpretations within the control unit, even when the device itself remains intact. A professional laboratory diagnosis can distinguish between external and internal faults.

How do you recognize a defect in the control unit 3Q959-10110-95256?

The primary sign of a defect in the control unit 3Q959-10110-95256 is a permanently illuminated airbag warning light on the instrument cluster. Often, the control unit cannot be accessed using a diagnostic tool, or specific fault codes such as “control unit defective” or “internal error” (e.g., B1000, 65535) appear.

The constantly lit airbag warning light is the clearest symptom. It alerts the driver that the occupant protection system is either non-functional or only partially operational and may fail to deploy in the event of a crash.

Another clear indication is the lack of communication with the control unit via the OBD interface. If the workshop cannot access the airbag system using a diagnostic tool, it strongly suggests that the control unit itself is at fault.

Specific entries in the fault memory also directly point to a defect. Messages like “control unit defective,” “internal hardware error,” or manufacturer‑specific codes such as 65535 or B1000 indicate a problem within the control unit itself, requiring electronic repair.

In which vehicles is the control unit 3Q959-10110-95256 installed?

The airbag control unit 3Q959-10110-95256 and its equivalent variants are specifically designed for various model series of the Hyundai Sonata. At Airbag24, we repair this module for the Hyundai Sonata EF, EF Facelift, and NF Facelift models. A repair restores full functionality to the safety system.

At Airbag24, we offer professional refurbishment of the control unit with part number 3Q959-10110-95256 for the following specific vehicle models:

Hyundai Sonata EF (model years approx. 1998–2001)

Hyundai Sonata EF Facelift (model years approx. 2001–2005)

Hyundai Sonata NF Facelift (model years approx. 2008–2010)

The repair also covers compatible part numbers 3Q959-10110, 95910-3Q110, 95910-38400, 5WK4247, and 95910-4R000, which may be installed in the same vehicles.

How is the control unit 3Q959-10110-95256 professionally repaired?

At Airbag24, the repair of the control unit 3Q959-10110-95256 follows a rigorous process. After removal at a specialized workshop, the unit is shipped to us. In the lab, technicians determine whether crash data needs to be erased or defective hardware components—such as memory chips or processors—must be replaced. Finally, functionality is verified on a test bench.

The process begins with the proper removal of the control unit, which is typically located in the center console of a Hyundai Sonata. Before removal, it is essential to disconnect the vehicle battery and observe an appropriate waiting period.

Upon submission to Airbag24, a comprehensive incoming inspection is performed. Our technicians verify communication functionality and analyze the fault memory. Depending on the diagnosis, either only the software is reset (clearing crash data) or a thorough hardware repair is carried out, involving desoldering defective electronic components and replacing them with new, high-quality parts.

Following restoration, each control unit undergoes a final functional test on a specialized test bench that simulates vehicle signals. This ensures the device operates flawlessly and is fully ready for use again. We provide a 12-month warranty on every repair.

What shipping options are available at Airbag24?

Airbag24 offers flexible shipping options for your control unit. You can send the package yourself free of charge or arrange a convenient UPS pickup at your preferred location. For returning the repaired unit, you have access to free UPS standard shipping, faster UPS express shipping, as well as cash-on-delivery options.

For sending the unit to us, you have two choices: you can ship it yourself or use our UPS pickup service, which collects the package directly from your location.

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

UPS Standard Shipping (1–3 business days) – FREE

UPS Express Shipping (1–2 business days)

UPS Standard Shipping with Cash on Delivery (1–3 business days)

UPS Express Shipping with Cash on Delivery (1–2 business days)

Alternatively, you can also pick up the repaired control unit in person at our facility.