Airbag control unit with part number 96 220 439

What is the function of the airbag control unit 96 220 439?

The airbag control unit with part number 96 220 439 is the central control module for the passive safety system in the Daewoo Lanos T150. It processes signals from crash sensors and is responsible for precisely triggering the airbags and seatbelt pretensioners within milliseconds in the event of a collision, thereby protecting the occupants.

As the “brain” of the restraint system (SRS), this unit continuously monitors all connected components—from the impact sensors at the front and sides of the vehicle to the ignition circuits of each airbag and seatbelt pretensioner. Only when all systems are recognized as functioning properly does the airbag warning light remain off after the engine starts.

A key feature of the control unit is its ability to store so‑called crash data. After deployment, the unit locks itself to prevent unauthorized reuse. This device is technically designed to be resettable and repairable.

In practice, alternative part numbers such as 96 217 003, 5WK4155-68HC05B16, 96 303 500, 7541114, and 7088107 are also known to be technically equivalent and can likewise be refurbished. For the Daewoo Lanos, additional repairable variants include 96 314 931 or 96 387 637.

Why does the control unit 96 220 439 fail?

The most common cause of failure for the control unit 96 220 439 is the storage of crash data following an accident. This data permanently disables the unit’s functionality and triggers the airbag warning light. Other causes may include internal hardware defects in memory chips or solder joints, as well as external factors such as undervoltage.

The blockage caused by crash data is a manufacturer‑specified safety measure. The fault memory can then no longer be cleared using standard diagnostic tools. A professional repair restores the unit to its factory settings, offering a cost‑effective alternative to replacing it with a new component.

Besides accident‑related failures, hardware defects on the circuit board can also occur. Cold solder joints or faulty memory chips (EEPROM) may disrupt operation even if the vehicle has not been involved in an accident. Such defects require component‑level repairs.

External factors—such as a weak vehicle battery, a defective coil spring on the steering wheel, or communication issues within the vehicle network (CAN bus)—can likewise lead to malfunctions in the airbag system. Thorough pre‑diagnosis is therefore essential to accurately pinpoint the source of the problem.

How do you recognize a defect in the control unit 96 220 439?

A defective airbag control unit 96 220 439 almost always manifests as a persistently illuminated airbag warning light on the instrument cluster. Additionally, the unit often becomes unresponsive to diagnostic tools, or specific error codes are stored indicating an internal fault or saved crash data.

The primary symptom is the active airbag warning light, signaling to the driver that the entire passive safety system is disabled and that neither airbags nor seatbelt pretensioners would deploy in the event of a crash. In this state, the vehicle is not roadworthy.

During diagnosis via an OBD scanner, the issue is frequently indicated by error codes pointing to an “internal control unit fault” or “crash event stored.” Clearing these specific errors is impossible with standard workshop equipment.

In some cases, complete loss of communication may also occur, rendering the control unit inaccessible through the diagnostic interface. This suggests a more severe internal hardware defect.

In which vehicles is the control unit 96 220 439 installed?

The airbag control unit with part number 96 220 439 was specifically developed for the Daewoo Lanos T150 model series and used during production years from 1997 to 2004. At Airbag24, this particular control unit for the aforementioned model is professionally refurbished to restore full functionality of the safety system.

Compatibility is limited to the following specific vehicle model:

Daewoo Lanos T150 (1997–2004)

Repairs performed at Airbag24 ensure that the refurbished control unit precisely meets the manufacturer’s specifications for this vehicle and operates reliably after installation.

How is the control unit 96 220 439 repaired?

Repair work at Airbag24 focuses on restoring the unit to its original factory condition. Upon receipt, the 96 220 439 control unit is thoroughly analyzed; stored crash data is electronically erased, and any hardware defects in components such as memory chips or solder joints are rectified. All repairs come with 2 years' statutory liability for defects.

The process begins with the proper removal of the control unit from the vehicle. In the Daewoo Lanos, it is typically located beneath the center console. Before removal, the vehicle battery must be disconnected without fail.

Once the unit has been received at Airbag24, technicians perform an initial inspection. This is followed by the actual repair, which includes erasing crash data and fixing any electronic faults. The control unit is restored to its original, fault-free condition.

After successful repair and a final functional test, the control unit is shipped back to you. Upon reinstallation in the vehicle, the vehicle’s overall fault memory usually needs to be cleared once to ensure the airbag warning light goes off. The repaired unit itself does not require re-coding.