Airbag control unit with part number W2T68182

What is the function of the airbag control unit W2T68182?

The airbag control unit with part number W2T68182 is the central control unit of the occupant safety system (SRS) in the Peugeot iOn I. It processes signals from the acceleration sensors to detect a collision and, if necessary, deploy the airbags and seatbelt pretensioners precisely and within seconds. After a crash, it stores the crash data and locks the system.

As the “brain” of the safety system, this unit continuously monitors all connected components, from the crash sensors to the airbag ignition circuits. It performs a self-test every time the vehicle is started. A fault-free condition is indicated by the brief illumination and subsequent extinguishing of the airbag warning light on the instrument panel.

Internally, it relies on a microcontroller, memory chips (EEPROM/Flash) for data storage, and specialized driver ICs to safely switch the high currents required to ignite the pyrotechnic charges.

Why does the W2T68182 control unit fail?

The most common cause of malfunction in the W2T68182 is the storage of crash data after an accident. The control unit then locks itself, requiring repair or a reset. In addition, internal electronic faults on the circuit board—such as issues with the power supply or memory chips—can also lead to failure.

Following a collision in which airbags or seatbelt pretensioners have deployed, the control unit irrevocably writes a crash record into its internal memory. This so‑called “crash lock” prevents reuse without professional servicing and ensures that the airbag warning light remains illuminated permanently, even after all deployed components have been replaced.

Besides accidents, hardware defects can also occur. These include internal malfunctions in the microcontroller or memory chips, often signaled by error messages such as “control unit defective.” Likewise, problems with the power supply, cold solder joints caused by thermal aging, or defects in the ignition circuit drivers may result in total failure or sporadic errors.

External factors like moisture or water damage frequently cause corrosion at connectors and traces, leading to communication failures on the CAN bus or complete system failure.

How do you recognize a defect in the W2T68182?

A defective W2T68182 airbag control unit primarily manifests as a persistently illuminated airbag or SRS warning light on the dashboard. Additional clear indicators include entries stored in the fault memory, such as “control unit defective” or “internal error,” as well as a lack of communication between the diagnostic tool and the control unit.

The most obvious symptom is the airbag warning light that fails to turn off after starting the vehicle. This signals an active, safety‑critical fault within the system, often originating directly in the control unit itself.

During a workshop diagnosis, it may happen that the control unit becomes unresponsive via the OBD interface. No fault memory can be read, and no communication can be established—even though other control units in the vehicle remain accessible. This points to a severe internal hardware defect.

Typical error codes that directly reference the control unit include phrases like “control unit internal error” or specific codes indicating issues with the internal memory (EEPROM) or the power supply.

In which vehicles is the W2T68182 installed?

The airbag control unit with part number W2T68182 is specifically used in the Peugeot iOn I. It is designed to match the system architecture and safety components of this electric vehicle. Airbag24 offers professional repair services for this control unit.

At Airbag24, the W2T68182 control unit is refurbished for the following model:

Peugeot iOn I (model years 2010–2020)

How does the repair process work at Airbag24?

Upon receipt of the control unit at Airbag24, a comprehensive diagnosis is performed to identify the exact cause of the fault. If the issue stems from stored crash data, the memory is professionally reset. For hardware defects, repairs are carried out at the component level, including replacement of faulty parts followed by functional testing on a test bench.

The process begins with an initial inspection, during which the fault memory is read and a visual check is conducted for external damage such as corrosion. Subsequently, it is determined whether resetting the crash data will suffice or if a more extensive electronic overhaul is required.

During hardware repairs, defective components—including voltage regulators, memory chips, or ignition circuit drivers—are replaced with new, high‑quality parts. Following repair, the control unit is tested on a specialized simulator that replicates a complete vehicle. This ensures that all functions, from sensor signal processing to activation of the ignition circuits, operate flawlessly. Airbag24 provides 2 years' statutory liability for defects on every repair.