Airbag control unit with part number 5WK4 2930

What is the function of the airbag control unit 5WK4 2930?

The airbag control unit with part number 5WK4 2930 is the central control module for the occupant restraint system (SRS) in the Hyundai ix55 EN (2009–2011). It continuously monitors sensor data to ensure precise and reliable deployment of airbags and other safety systems, such as the fuel shut-off valve, in the event of a crash.

As an SRS control unit (Supplemental Restraint System), it evaluates signals from the vehicle’s acceleration and pressure sensors. Based on this data, the electronics determines within milliseconds whether and which restraint systems need to be activated to provide optimal protection for occupants.

In addition to controlling the airbags, the unit also communicates with other vehicle systems. One of these functions is managing the fuel shut-off valve, which cuts off the fuel supply after a severe accident to minimize the risk of fire.

Why does the control unit 5WK4 2930 fail?

Failures of the 5WK4 2930 control unit often occur after accidents when crash data is stored in its internal memory, causing the unit to lock up. However, purely electronic faults, moisture ingress, damaged wiring or connectors, and internal component failures can also lead to malfunctions.

The most common cause of apparent failure is the storage of crash data. After deploying airbags—such as the knee airbag—the control unit becomes locked and must be reactivated by resetting the stored data. Without this reset, the airbag warning light remains illuminated.

Classic hardware defects are another typical cause of failure. Internal circuit board issues, cold solder joints, or malfunctioning memory chips can impair the unit’s functionality or result in total failure. Such problems are often not externally visible and require thorough electronic diagnostics.

In practice, when diagnosing vehicles like the Hyundai ix55, technicians frequently refer to similar control units with part numbers such as 95910-3J600. This highlights that fault patterns and repair approaches are often transferable across a single vehicle generation.

How do you recognize a defect in the 5WK4 2930 control unit?

A defect in the 5WK4 2930 airbag control unit primarily manifests as a permanently lit or flashing airbag warning light (SRS lamp) on the instrument cluster. Often, the control unit cannot be read using a diagnostic tool, or specific error messages such as “internal error” appear.

The clearest indication is the illuminated SRS warning light, signaling that the restraint system is not fully operational and that airbags may fail to deploy in the event of a crash. This significantly compromises the vehicle’s passive safety.

Another clear symptom is the lack of communication: when the workshop attempts to read the fault memory, the diagnostic tool cannot establish a connection with the airbag control unit, pointing to a serious internal fault within the module.

Additionally, specific error codes may be stored in the fault memory, directly referencing the control unit. Messages such as “side‑sensor error,” “fuel shut-off valve defective,” or references to stored crash data are typical entries indicating the need for repair.

In which vehicles is the 5WK4 2930 control unit installed?

The airbag control unit with part number 5WK4 2930 was specifically designed for use in the Hyundai ix55. At Airbag24, we offer professional repair services for this control unit, which is installed in the following vehicle series.

The assignment is highly specific and applies to the following model:

Hyundai: ix55, EN series (model years 2009–2011)

How is the 5WK4 2930 repaired?

Repairing the 5WK4 2930 control unit at Airbag24 provides a sustainable and cost-effective alternative to purchasing a new unit. The process includes detailed electronic diagnostics, targeted correction of defects—such as clearing crash data and replacing faulty components—and a final functional test.

After removal from the vehicle, the control unit is securely packaged for transport and sent to Airbag24. Upon arrival at our workshop, it is advisable to first verify whether the fault originates solely from the control unit or if other causes, such as cable damage, are involved.

At Airbag24, technicians begin with a thorough diagnosis to systematically identify the root cause of the issue. This is followed by actual restoration work, which may involve clearing crash data (crash reset), resoldering connections, or replacing defective electronic components with original parts.

Following successful repair, the control unit undergoes a comprehensive functional test to ensure all systems are operating flawlessly once again. We provide 2 years' statutory liability for defects on the completed repair.