Airbag control unit with part number 5WK42995

What is the function of the airbag control unit 5WK42995?

The airbag control unit with part number 5WK42995 is the central control module of the occupant restraint system (SRS) in Hyundai Equus models of generations LZ/YJ and VI. It analyzes data from crash sensors and, within milliseconds, determines whether to deploy airbags and seatbelt pretensioners, ensuring occupant safety.

As the SRS control unit, this module continuously monitors all connected components of the safety system, including various airbags, seatbelt pretensioners, and acceleration and pressure sensors distributed throughout the vehicle.

In the event of a collision, it processes incoming signals and activates the necessary restraint devices. After deployment, the unit stores crash data and typically locks itself to prevent further driving with a potentially compromised system.

Why does the airbag control unit 5WK42995 fail?

The most common cause of failure for the 5WK42995 control unit is the storage of crash data following an accident, which blocks airbag functionality. Other causes include internal electronic malfunctions resulting from moisture, water damage, or vibrations, leading to communication interruptions or persistent internal error codes.

After an airbag deployment, the control unit is not necessarily destroyed; however, it becomes locked due to the stored crash data. This lock is a safety feature that must be professionally reset to restore the system’s operational readiness.

Internal faults are another frequent issue. Defects in electronic components such as capacitors or processors, broken solder joints, or corrosion caused by ingress of moisture can completely disable the device and result in permanent error messages.

In some cases, an internal fault renders the control unit inaccessible via the diagnostic interface, significantly complicating troubleshooting in the workshop since specific error codes can no longer be read.

How do you recognize a defect in the 5WK42995?

A defective 5WK42995 control unit primarily manifests as a permanently illuminated airbag warning light (SRS light) on the instrument cluster. Additional clear indicators include loss of communication with the diagnostic tool or the presence of error codes pointing to an internal malfunction of the module.

The most obvious symptom is the persistently lit SRS indicator light, which fails to extinguish after engine start-up, signaling that the airbag system is non-functional and will result in a significant deficiency during the next technical inspection (TÜV).

Another clear sign occurs when the workshop’s diagnostic equipment cannot establish a connection with the airbag control unit. The module no longer responds to requests, making precise fault diagnosis of connected sensors impossible.

If error codes are read that explicitly indicate an “internal control unit error” or a “module problem,” the root cause lies directly within the device itself, rather than external components like sensors or wiring. Less common symptoms may include a faint glow when locking the vehicle or malfunctions in the speedometer illumination.

In which vehicles is the 5WK42995 installed?

The part number 5WK42995 is a specialized airbag control unit designed specifically for Hyundai vehicles. It is exclusively fitted in Hyundai Equus luxury sedans across two generations, from the late 1990s through 2016.

At Airbag24, we repair the 5WK42995 control unit for the following specific Hyundai models and series.

This control unit is installed in the Hyundai Equus sedan of generation LZ/YJ, produced between 1999 and 2009.

It is also found in the successor model, the Hyundai Equus of generation VI, manufactured from 2009 to 2016.

Before submitting a repair request, it is crucial to verify and match the part number printed on the control unit housing to ensure correct identification and processing.

How is the 5WK42995 professionally repaired?

Professional repair of the 5WK42995 involves precise diagnostics to read out error codes and crash data. Subsequently, crash data is erased, and any defective electronic components are replaced. A thorough final inspection ensures full functionality without requiring reprogramming.

Upon receiving the removed control unit at Airbag24, the repair process begins with an in-depth analysis. Using specialized diagnostic tools, the error memory and any existing crash data are read out to pinpoint the exact cause of the fault.

In the next step, the actual repair takes place. Stored crash data is professionally erased. If hardware defects are detected—such as damaged capacitors or circuit traces corroded by moisture—these are expertly fixed and the affected components replaced.

Finally, the control unit undergoes rigorous functional and communication testing to ensure it operates flawlessly once again. We provide 2 years' statutory liability for defects on the completed repair.