Airbag control unit with part number 5WK4142

What is the function of the airbag control unit 5WK4142?

The airbag control unit with part number 5WK4142 is a Bosch OEM component specifically designed for the Hyundai Accent X3. It serves as the central control module of the occupant protection system, processing sensor data, deploying airbags and seatbelt pretensioners in the event of a crash, and storing relevant crash data in its internal memory.

As the brain of the passive safety system, this control unit continuously monitors signals from acceleration and angular velocity sensors. If the electronics detect a collision exceeding predefined thresholds, it sends ignition pulses to the corresponding airbag modules and seatbelt pretensioners within milliseconds.

Technically, this control unit is also known under the Hyundai part number 95910-22300 and is compatible with variants such as 959101R250, 95910-25400, and 95910-1E150. Its primary role is to ensure occupant safety and, following an incident, to store crash data for later analysis.

Why does the airbag control unit 5WK4142 fail?

The most common causes of failure for the 5WK4142 control unit include stored crash data after an accident that blocks further functionality, as well as electronic defects in internal components. External factors such as water damage or moisture can also lead to irreparable damage to the circuit board electronics.

After a crash, the unit stores relevant collision data and, for safety reasons, locks itself out. This condition is often logged as an “internal error” in the fault memory, preventing reactivation of the airbags. In such cases, a data reset is required.

Hardware defects represent another major cause. Faults in individual components—such as capacitors, sensors, or memory chips on the circuit board—can disrupt operation. Since these defects are typically localized, the control unit is considered highly repairable, allowing targeted component-level repairs.

How do you recognize a defect in the 5WK4142 control unit?

A defective 5WK4142 airbag control unit usually manifests as a permanently illuminated or flashing SRS warning light on the dashboard. Additionally, the unit may become unresponsive to diagnostic tools, making fault diagnosis at a workshop impossible.

The primary and unmistakable symptom is the active airbag warning light (SRS light), indicating to the driver that the passive safety system is non-functional and that airbags would not deploy in the event of a crash.

Another clear sign is complete communication failure. When a workshop attempts to read the fault memory via the OBD2 interface, no response is received from the control unit, suggesting a serious internal malfunction.

Specific error codes such as “side‑sensor error,” along with accompanying symptoms like a faulty dashboard illumination, may also appear. In any case, immediate inspection and repair are essential to restore full occupant safety.

In which vehicles is the 5WK4142 control unit installed?

The Bosch 5WK4142 control unit, along with its Hyundai equivalents (e.g., 95910-22300), is specifically designed for the first generation of the Hyundai Accent. Repair services are available for models in the X3 series and their facelift versions produced between 1994 and 2000.

At Airbag24, we repair the 5WK4142 control unit for the following models:

Hyundai:

Accent X3 (model years 1994–1997)

Accent X3 Facelift (model years 1997–2000)

Our service covers not only the original Bosch 5WK4142 but also the equivalent Hyundai OEM part numbers 95910-22300, as well as compatible variants 959101R250, 95910-25400, and 95910-1E150.

How is the 5WK4142 control unit professionally repaired?

Professional repair of the 5WK4142 at Airbag24 involves a systematic process of fault identification followed by targeted restoration. This may include securely erasing stored crash data or replacing defective electronic components on the circuit board. A final functional test ensures full operational readiness.

Upon submission to Airbag24, repairs follow a proven procedure. First, the unit is thoroughly inspected using advanced diagnostic equipment to determine whether a simple data reset suffices or if hardware issues exist—such as problems with memory chips or capacitors.

Subsequently, repairs proceed at the component level. Stored crash data is completely and safely removed to unlock the control unit. For hardware faults, defective parts are replaced with high-quality aftermarket components. This approach is significantly more cost-effective than purchasing a new unit while preserving the original part.

Finally, the refurbished control unit undergoes a comprehensive functional test. This ensures it communicates flawlessly once again and fully performs its protective function in the vehicle. We provide 2 years' statutory liability for defects on every repair.