Airbag control unit with part number 5WK44114

What is the function of the airbag control unit 5WK44114?

The airbag control unit with supplier number 5WK44114 is the central control unit for the occupant protection system in the Audi SQ5 and Q5 of the 8R series. It continuously analyzes data from the crash sensors and, within milliseconds, determines whether and which restraint systems—such as airbags and seatbelt pretensioners—need to be activated.

Technically, it is a control unit manufactured by Siemens/Continental, available under various Audi original part numbers (OEM) such as 8R0959655A or 8R0959655F, with multiple index versions (e.g., Z06, Z07, Z08). Its primary task is to monitor all safety‑related components and store internal system faults as well as crash data in non-volatile memory (EEPROM/Flash).

Through precise control, it ensures the proper functioning of the entire passive safety system and communicates the system status to the instrument cluster, indicated by the airbag warning light.

What defects occur in the control unit 5WK44114?

The most common reason for repairing the 5WK44114 is the storage of crash data after an airbag deployment. Other typical defects include internal electronic errors in the memory or power supply, leading to total failure or communication issues.

After a crash in which airbags or seatbelt pretensioners have been deployed, the control unit locks itself internally by permanently storing crash data in its memory. Even after replacing all pyrotechnic components, the airbag warning light remains illuminated because this data cannot be erased using conventional diagnostic tools. An electronic repair restores the unit to its factory settings.

Internal memory or software errors are another frequent cause of failure. These result in issues with data stored in EEPROM or Flash memory, manifesting as error messages such as “control unit defective” or checksum errors. Such errors may also occur spontaneously or following voltage fluctuations—for example, due to a weak battery.

Rarer are hardware defects in circuit board components. These include faulty parts in the internal power supply, defective driver ICs for ignition circuits, or damaged CAN‑bus drivers that prevent communication with diagnostic equipment. Overvoltage or short circuits in the vehicle’s electrical system can also cause such damage.

How do you recognize a defect in the 5WK44114?

A defect in the airbag control unit 5WK44114 primarily manifests as a permanently illuminated airbag warning light on the dashboard. Often, communication via diagnostic tools like VCDS or ODIS is no longer possible, or specific fault codes indicating an internal malfunction are recorded.

The clearest symptom is the persistently lit airbag warning light. It does not extinguish after starting the engine, signaling an active, safety‑relevant fault within the system.

Another clear indication is the complete loss of diagnostic capability. The workshop cannot establish a connection with the airbag control unit using diagnostic equipment to read or clear the fault memory; the unit fails to respond to requests.

If fault codes such as “control unit defective,” “internal memory error,” or “checksum error” are detected, the root cause lies unequivocally within the control unit itself. These errors point to damage to the internal data structure or hardware.

Following a crash, the airbag warning light also remains on—even after all visible damages and deployed components have been replaced. This is due to the stored crash data that continues to block the system.

In which vehicles is the control unit 5WK44114 installed?

The airbag control unit with part number 5WK44114 is primarily used in the sporty version of the Audi Q5—the SQ5 of the 8R series—as well as in the corresponding facelift models of the Q5 8R. Production years typically range from 2012 to 2017.

At Airbag24, we repair the 5WK44114 control unit and associated Audi OEM numbers (e.g., 8R0959655A, 8R0959655F) for the following models:

Audi SQ5 8R (2012–2015)

Audi Q5 8R Facelift (2015–2017)

What are the advantages of repair over a new part?

Repairing the original control unit is significantly more cost‑effective than purchasing a new one from Audi. Additionally, the complex programming and coding process is eliminated, as the vehicle‑specific original unit is retained, reducing environmental impact.

The greatest advantage is the substantial cost savings compared to a new control unit from the vehicle manufacturer. Repair costs often amount to only a fraction of the price of a new unit.

Since the original control unit is repaired and reused, all vehicle-specific configurations and data are preserved. Time-consuming programming or coding—often required with used or new control units—is eliminated. The unit is simply reinstalled, and the fault memory is cleared.

Repairing automotive electronics is a sustainable solution. It prevents electronic waste and conserves resources that would otherwise be needed to manufacture new components.

How does the repair of 5WK44114 at Airbag24 work?

The repair process at Airbag24 is designed for safe and efficient handling. After removal by a specialized workshop, you send the control unit along with a detailed description of the fault. Our technicians perform a thorough analysis and electronic repair, followed by a functional test.

As a first step, a specialist workshop should read out the fault memory to confirm that the defect lies in the control unit itself and not in the wiring or sensors. Subsequently, with the battery disconnected, the control unit is carefully removed from the center console.

Upon receipt at Airbag24, professional repair takes place. Depending on the nature of the fault, this may involve precisely resetting crash data, correcting memory errors through reprogramming relevant data areas, or replacing defective electronic components on the circuit board.

Following successful repair, each control unit is tested on a dedicated test bench. Here, communication, internal functions, and the system’s error-free startup are simulated and verified.

The refurbished control unit is returned to you. After reinstallation, the workshop only needs to clear the vehicle’s fault memory and perform a final system check. We provide 2 years' statutory liability for defects on every repair.