Airbag control unit with part number 1681929180

What is the function of Airbag Control Unit 1681929180?

The airbag control unit with part number 1681929180 is an original control module supplied by Autoliv (PSA Original). It serves as the central processing unit for the occupant protection system in vehicles such as the Peugeot J5 I and Citroën Jumper I, activating the airbags and seatbelt pretensioners in the event of a crash.

As a core component of the passive safety system, this control unit continuously processes data from various acceleration sensors throughout the vehicle. When the electronics detect a collision exceeding predefined thresholds, it sends ignition signals within milliseconds to the corresponding pyrotechnic charges of the airbags and seatbelt pretensioners.

This unit is technically designed specifically for the first generation of the Jumper and J5 models. Comparable control units with similar functions are known under part numbers 5WK42810 from Continental or 1321119080, which can be used in related vehicle platforms.

Why does control unit 1681929180 fail?

The most common cause of failure for control unit 1681929180 is stored crash data following an accident, which prevents further functionality. In addition, internal electronic faults—often caused by aging or moisture—can lead to complete failure, indicated by specific error codes such as B0100.

After a collision, the control unit permanently stores so‑called crash data in its internal memory. This lockout is a safety measure that ensures a potentially damaged system is not reused. Such data cannot be erased using standard workshop diagnostic tools, making repair or replacement unavoidable.

Another frequent reason is hardware defects on the circuit board. Error codes B0100 or B0100-49 (ECU internal electronic failure) directly point to such an internal electronic fault. Common causes include aging components, corroded solder joints due to moisture ingress, or defective memory chips, which may also trigger error codes like FFFF.

How do you recognize a defect in the airbag control unit?

A defective control unit 1681929180 primarily manifests as a continuously or intermittently illuminated airbag warning light (SRS symbol) in the instrument cluster. Another clear indication is the control unit’s inability to communicate with a diagnostic tool via the OBD interface.

The most obvious symptom is the active airbag warning light, which fails to extinguish after engine start-up or re‑illuminates shortly thereafter (e.g., within 30 seconds). This signals a critical system error, preventing the airbags from deploying in the event of a crash. A main inspection (TÜV) cannot be passed with this issue.

In cases of severe internal malfunction, the control unit often becomes un-diagnosable. The workshop cannot establish a connection via OBD tester to read out the fault memory, strongly suggesting a failure of the central processor or the power supply on the circuit board.

When error codes are read, specific entries such as B0100 (internal electrical/electronic fault) or B101C (fault in the seatbelt buckle switch) directly pinpoint the source of the problem. Additionally, the inability to erase stored crash data or missing vehicle identification numbers is another clear sign of a defective or locked‑out control unit.

In which vehicles is part number 1681929180 installed?

The airbag control unit 1681929180 from Autoliv is mainly used in light commercial vehicles of the PSA Group and related models manufactured between 1994 and 2002. Its primary focus is clearly on the first generation of identical vans from Peugeot, Citroën, and Fiat.

At Airbag24, we repair control unit 1681929180 for the following specific models:

Peugeot J5 I (model years 1994–2002)

Citroën Jumper I (model years 1994–2002)

This control unit is also associated with the Fiat Ducato 250 (without brake assist). Similar control units can also be found in successor models such as the Peugeot Boxer, as well as Citroën Jumper II and III.

How does repair work at Airbag24?

Professional repair at Airbag24 begins with the submission of the removed control unit. Our technicians perform a detailed analysis, fix electronic faults at the component level, and reliably erase stored crash data. Following a successful final test, the unit is returned to the customer.

Before removal, a specialized workshop should confirm that the fault lies unequivocally within the control unit itself and is not caused by peripheral components such as the seat occupancy mat or defective sensors. A diagnostic report aids in targeted repairs.

Upon receipt at Airbag24, the control unit is opened and its circuit board undergoes a thorough inspection. Our technicians repair internal electronic faults—such as those causing error code B0100—and reset the internal memory to erase all crash data. This process restores full functionality.

Finally, the repaired control unit is subjected to a functional test. You will receive your fully operational unit, complete with an inspection report, backed by a 12-month warranty. After reinstalling it in your vehicle, you may need to clear the system’s fault memory.

What shipping options are available for repair?

To send your defective control unit to Airbag24, you can either ship it yourself or arrange for UPS to pick it up conveniently from your preferred location. For return shipping, we offer free standard UPS delivery as well as flexible express and cash-on-delivery options.

You can send the package at your own expense or bring it in person. Alternatively, you can schedule a UPS pickup that collects the package directly from your home or workshop.

After successful repair, you have several return‑shipping options: free standard UPS delivery, UPS express delivery, standard UPS delivery with cash on delivery, or express UPS delivery with cash on delivery. Of course, you can also choose to pick up the repaired unit in person at our facility.