Airbag control unit with part number 5WY67040

What is the function of the airbag control unit 5WY67040?

The airbag control unit with part number 5WY67040 is the central control module of the occupant safety system (SRS) in the Daewoo Kalos T250. It processes signals from acceleration sensors to detect a collision and, in the event of an accident, precisely and within seconds deploys the airbags and activates the seatbelt pretensioners.

This component continuously monitors all safety‑related components of the restraint system, including the various sensors, airbag modules, and seatbelt pretensioners. It performs a self‑test every time the vehicle is started.

If this control unit malfunctions or fails, the vehicle’s entire passive safety system is disabled, posing a significant risk in the event of a collision.

Why does the 5WY67040 control unit fail?

The most common cause of failure for the 5WY67040 control unit is the storage of crash data after an accident, which results in the unit being locked out. In addition, electronic malfunctions such as water damage, internal component defects, or peripheral issues (cables, connectors, sensors) can lead to complete failure.

After a collision in which the airbags have deployed—or even just a severe impact—the control unit permanently stores this information. This lockout, known as “crash data,” is a safety feature that prevents reuse without professional repair.

Other causes are purely electronic. Internal board faults, indicated by error code B1111, point to defective components. External factors like moisture ingress can also cause corrosion and short circuits, disabling the unit.

How do you recognize a defect in the 5WY67040?

A defect in the 5WY67040 airbag control unit is unmistakably signaled by a constantly illuminated or flashing SRS warning light on the instrument cluster. In this state, all airbags and seatbelt pretensioners are deactivated, posing a serious safety risk in the event of a crash. Continuing to drive is not recommended.

The persistent illumination of the airbag or SRS indicator light is the clearest warning sign. It indicates that during the vehicle’s self‑test at startup, a critical fault was detected, prompting the precautionary deactivation of the entire restraint system.

The final diagnosis is performed in a workshop using an OBD diagnostic tool. By reading the fault memory, the exact location of the fault can be identified. Error codes indicating an “internal control unit fault” confirm a defect in the device itself.

In which models is the 5WY67040 installed?

The airbag control unit with part number 5WY67040 is specifically designed for vehicles of the Daewoo brand. It is primarily used in the Daewoo Kalos T250 series, produced between 2002 and 2011. Airbag24 specializes in repairing this particular unit.

At Airbag24, the 5WY67040 control unit is professionally refurbished for the following model:

Daewoo Kalos (T250 series), model years 2002–2011

Exact fit and functionality are guaranteed for this vehicle model. Removal is carried out specifically for each vehicle and often takes place beneath the center console or under one of the front seats.

How is the 5WY67040 professionally repaired?

Professional repair of the 5WY67040 control unit is performed at the component level. After sending the unit to Airbag24, it undergoes analysis, stored crash data is erased, and defective electronic components are replaced. Final tests restore full functionality, backed by 2 years’ statutory liability for defects.

The repair process at Airbag24 follows established procedures. Once removed from the vehicle, the control unit is shipped to the lab for a detailed incoming inspection, where hardware is analyzed and the fault memory is read.

Next, stored crash data is securely and completely deleted. Defective electronic components on the circuit board are identified and replaced with new, high‑quality parts. Following refurbishment, the control unit undergoes comprehensive functional testing on a specialized test bench to ensure flawless communication with all sensors and actuators.

Is repairing the 5WY67040 worthwhile?

Yes, repairing the 5WY67040 is an economically and environmentally sound alternative to costly replacement. Compared to a new unit, which often costs over 500 euros, repairs save significantly while conserving resources, since only the defective components are replaced.

The biggest advantage is substantial cost savings. While a repair typically ranges from 100 to 200 euros, a new control unit from the manufacturer can quickly exceed 500 euros. Moreover, a repaired unit requires no re‑coding and can be reinstalled immediately, saving additional workshop expenses.

Moreover, the repair is sustainable, as it extends the lifespan of existing electronics and thus helps avoid electronic waste. Airbag24 provides 2 years' statutory liability for defects on every repair performed.