Airbag control unit with part number 5WK4113A

What is the function of the airbag control unit 5WK4113A?

The airbag control unit 5WK4113A from GM, also known as part number 90562544, is the central control module for the occupant protection system in the Opel Astra F. It processes signals from the sensors and is responsible for the timely deployment of airbags and seatbelt pretensioners during a collision.

As the “brain” of the restraint system (SRS), this module continuously monitors all connected components, including front and side airbags, seatbelt pretensioners, and the crash sensors distributed throughout the vehicle that detect impacts.

Compatibility is guaranteed only with the exact part number 5WK4113A or the alternative GM number 90562544. Another reference may be 5WK4113A-68HC05B6, which indicates the processor unit installed.

Why does the control unit 5WK4113A fail?

The most common causes of failure for the 5WK4113A control unit are stored crash data after an accident, which blocks further functionality, as well as internal hardware defects. Moisture ingress or natural wear and tear of electronic components can also lead to complete module failure.

After a collision—even if only individual airbags, such as the knee or rear airbags, have deployed—the device permanently stores crash data. This is a safety measure that locks the module, preventing reuse without professional repair. Simple clearing via a diagnostic tool is not possible.

Another widespread cause is damage to internal components on the circuit board. These may include faulty memory chips, processors, or other electronic parts that fail due to aging or voltage spikes, disabling the entire system.

Moisture inside the vehicle can also result in severe damage. Penetrating water causes corrosion on sensitive traces and solder joints, leading to short circuits and permanent failure of the control unit.

How do you recognize a defect in the 5WK4113A?

A defect in the airbag control unit 5WK4113A almost always manifests as a permanently illuminated airbag warning light on the instrument cluster. Often, communication with the control unit via a diagnostic tool is no longer possible, making troubleshooting at the workshop more difficult.

The primary and most definitive symptom is the persistently lit airbag warning light (SRS light). It does not turn off after starting the vehicle, indicating a serious, stored error within the system.

Workshops frequently report that the control unit no longer responds to diagnostic requests. Attempts to read fault codes fail because no connection can be established with the module, clearly isolating the fault to the control unit itself.

In rarer cases, there may be a faint glow from the warning light or malfunctions in the speedometer illumination. In essence, when a defect occurs, the protective function of the entire airbag system is disabled.

In which models is the 5WK4113A installed?

The airbag control unit with part number 5WK4113A and the alternative reference 90562544 is specifically designed for the Opel Astra F model years 1991–2000. Repair services at Airbag24 provide a proven and reliable solution for this widely used model.

Specifically, this control unit can be found in the following vehicle series:

Opel: Astra F (model years 1991–2000)

When repairing or replacing, it is crucial that the part number matches exactly to ensure full compatibility and functionality. At Airbag24, each unit is professionally refurbished for this specific vehicle model.

How is the 5WK4113A professionally repaired?

Professional repair at Airbag24 includes precise diagnostics of the submitted control unit, deletion of crash data, replacement of defective electronic components, and a final functional test. This process restores full operability and is backed by 2 years' statutory liability for defects.

Before removal, a check at a specialized workshop is recommended to rule out faults in external components such as sensors or wiring. A diagnostic report should be included with the shipment to Airbag24.

Upon receipt of the control unit, a detailed analysis is performed on specialized test benches. Technicians pinpoint the exact source of the problem—whether it’s an internal component defect or stored crash data.

Repair involves professionally resetting crash data at the hardware level and replacing defective components with new, high-quality parts. The device’s functionality is then thoroughly tested.

Repair is a significantly more cost-effective alternative to expensive new purchases and restores the original functionality of the component. Airbag24 provides 2 years' statutory liability for defects on every repair performed.