Airbag control unit with part number 1356791080

What is the function of Airbag Control Unit 1356791080?

The airbag control unit with part number 1356791080 is the central control module for the entire passive safety system (SRS) in vehicles such as the Citroën Jumper and Peugeot Boxer. It processes signals from crash sensors to detect a collision and, if necessary, deploys the appropriate airbags and seatbelt pretensioners. Additionally, it stores crash‑related data after a collision.

As the “brain” of the restraint system, this ECU (Electronic Control Unit) continuously monitors all connected components—from impact sensors and seat occupancy mats to the airbag igniters. Its primary task is to make split‑second decisions on whether to deploy the airbags, ensuring occupant safety.

Following a crash in which the airbags have deployed, the unit stores so‑called crash data. For safety reasons, this information locks the control unit, preventing further use until it has been professionally reset or repaired. It is primarily installed in commercial vehicles such as the Citroën Jumper, Peugeot Boxer, and similar models like the Fiat Ducato.

Why does Airbag Control Unit 1356791080 fail?

The most common cause of failure for control unit 1356791080 is the storage of crash data after an accident, which blocks its functionality. In addition, internal electronic hardware defects—caused by component aging, moisture ingress, or faulty solder joints—often lead to complete failure, indicated by error code B0100.

An internal electronic fault, typically logged in the fault memory under error codes B0100 or B0100‑49, points to a serious hardware defect on the circuit board. This can result from aged microprocessors, defective memory chips, or corrosion at solder joints caused by moisture exposure.

For this type of unit, repair is usually a cost‑effective alternative to replacing it with a new one. Technically skilled workshops can both erase stored crash data and restore damaged electronic components on the circuit board.

This control unit is also often compatible with alternative part numbers such as 1357312080, 1358991080, 1370978080, or 5WK43157. Matching these numbers can be helpful when searching for replacement parts or during repairs.

How do you recognize a defect in control unit 1356791080?

A defect in control unit 1356791080 is primarily indicated by a permanently illuminated or flashing airbag warning light (SRS lamp) in the instrument cluster. Often, the control unit is also unreachable by diagnostic equipment (no communication), and error codes such as B0100 or FFFF are recorded in the vehicle’s system.

The most obvious sign is the active SRS indicator light, which fails to turn off after starting the vehicle—signaling a serious, safety‑critical fault in the airbag system and resulting in a major deficiency during the vehicle inspection.

Another clear symptom is the lack of communication: if the workshop cannot access the airbag control unit via the OBD interface using diagnostic equipment, this strongly suggests a complete internal failure.

In addition, specific error codes may be read out. Codes B0100, B0100‑49, or FFFF directly indicate an internal electronic fault. Less commonly, other symptoms such as malfunctioning speedometer illumination or a blinking engine check light may occur.

Important note: Before attributing the issue to the control unit itself, peripheral components like seat occupancy mats or seatbelt pretensioners should always be inspected by a qualified workshop. Using simulators or resistors to bypass faults is life‑threatening and will result in the loss of vehicle operating approval.

In which vehicles is control unit 1356791080 installed?

Airbag Control Unit 1356791080 is mainly used in various commercial vehicles from Citroën and Peugeot. At Airbag24, we repair this unit for models such as the Peugeot Boxer II, the first and fourth generations of the Citroën Jumper, the Citroën Relay I, and the electric Citroën ë‑Jumper IV. It is also found in platform‑compatible vehicles like the Fiat Ducato.

At Airbag24, we have successfully performed repairs on this control unit for the following specific models and series:

Peugeot: Boxer II (model years 2001–2006)

Citroën: Jumper I (1994–2002), Jumper IV, Relay I (1994–2002), as well as the electric ë‑Jumper IV variant.

Since this control unit may also be installed in other models within the group and its partner brands, verifying the part number printed on the device is crucial for identification.

How does the repair of control unit 1356791080 work?

The repair of control unit 1356791080 at Airbag24 begins with the submission of the removed unit, accompanied by a detailed fault description. Our technicians perform a thorough analysis, rectify internal electronic faults, replace defective components, and reset stored crash data. Following a final functional test, the unit is returned with 2 years' statutory liability for defects.

Once the removed control unit has been received at Airbag24, the repair follows a proven, professional procedure. First, an incoming inspection is carried out to verify the customer-reported fault and check the unit for external damage such as moisture.

This is followed by actual component-level refurbishment. Depending on the defect, stored crash data is erased, faulty microchips or other electronic components are replaced, and cold or damaged solder joints are reworked. The unit is restored to its original, fully functional condition.

After successful repair, each control unit undergoes a comprehensive functional test on a specialized test bench. Only when all functions operate flawlessly is the unit approved for return shipment. We provide 2 years' statutory liability for defects on every repaired unit.

Following reinstallation in the vehicle, it is usually necessary to clear the vehicle’s fault memory using an appropriate diagnostic tool to fully reactivate the airbag system.