Airbag control unit with part number 98 039 168 80

What is the function of the airbag control unit 98 039 168 80?

The control unit with the original Citroën/Peugeot part number 98 039 168 80 is the central control module for the occupant restraint system (SRS). It processes data from acceleration and crash sensors to ensure that, in the event of a collision, the airbags and seatbelt pretensioners are deployed precisely and at the right moment.

This unit is responsible for monitoring and diagnosing all safety‑related components of the SRS. These include front, side, and head airbags, seatbelt pretensioners, seat occupancy detection, as well as their associated sensors. It also stores all relevant system states and fault codes, which can be read out via a diagnostic interface.

The proper functioning of this control unit is essential for vehicle safety, as a failure or malfunction could disable the entire restraint system or, in the worst case, lead to unintended deployment.

Why does the control unit 98 039 168 80 fail?

The most common reason for servicing this control unit is stored crash data following an accident. Other defects include internal hardware failures on the circuit board, such as damaged memory chips (EEPROM/Flash), or communication errors that prevent reading the fault memory.

A key reason for repair is the storage of crash data. After an accident, the control unit internally locks its functionality to prevent re‑deployment. This data is permanent and cannot be erased using standard workshop testers. The repair involves carefully resetting the memory.

In addition, purely electronic faults may occur. These include defective SMD components such as voltage regulators, MOSFETs, or drivers on the board, which can fail due to aging or voltage spikes. The internal memory (EEPROM or Flash) may also be damaged, resulting in inconsistent data or a complete firmware failure. Such internal issues often manifest as specific error codes.

In practice, related part numbers—such as 1681055580 for comparable modules in Peugeot and Citroën vehicles—are frequently used for identification purposes.

How do you recognize a defect in the control unit 98 039 168 80?

The primary symptom of a defect is the permanently illuminated airbag warning light on the instrument cluster. Additionally, fault codes may be stored in the fault memory, indicating an internal control unit error or stored crash data that cannot be cleared.

The clearest sign is the active airbag indicator light. It does not extinguish after starting the vehicle, signaling an ongoing, safety‑critical fault within the SRS.

During diagnosis via the OBD interface, specific error codes can often be retrieved. Typical entries include “Crash data stored” or “Internal control unit error.” A clear indication of a defect is when these error codes persist despite multiple attempts to reset them.

In some cases, communication with the control unit is completely disrupted. The diagnostic tool then fails to establish a connection, suggesting a severe internal hardware fault.

In which vehicles is the control unit 98 039 168 80 installed?

The airbag control unit 98 039 168 80 is an original part primarily used in Citroën and Peugeot vehicles. This includes models such as the first‑generation Citroën SpaceTourer and the Peugeot iOn. At Airbag24, we repair this specific module for the listed vehicles.

At Airbag24, the control unit with part number 98 039 168 80 is repaired for the following models and series:

Citroën: SpaceTourer I (2016–2023), as well as similar modules for models like the Berlingo.

Peugeot: iOn I (2010–2020).

How is the control unit 98 039 168 80 professionally repaired?

At Airbag24, repairs follow a strict technical protocol. Following an initial inspection, the cause is analyzed down to the component level. Restoration includes safely erasing crash data, repairing EEPROM contents, or replacing defective SMD components. Final functional tests ensure quality.

For efficient diagnosis, it is helpful to read the fault memory before removal and attach the printout to the package. Upon receipt of the control unit at Airbag24, a visual inspection of the circuit board, connectors, and solder joints is performed to rule out obvious physical damage.

The actual electronic repair depends on the nature of the fault. For stored crash data, the memory contents (EEPROM/Flash) are read, crash information is removed, and the correct checksum is restored. In cases of hardware defects, faulty SMD components such as voltage regulators or drivers are identified and replaced professionally. This requires precise soldering work and expertise in the control unit’s circuitry.

After repair, the control unit is thoroughly tested. We verify that all fault codes have been cleared and that communication functions flawlessly. We provide 2 years' statutory liability for defects on every repair.