Airbag control unit with part number 9654491080

What is the function of the airbag control unit 9654491080?

The airbag control unit with part number 9654491080 is the central control module for the occupant restraint system (SRS) in vehicles such as the Peugeot 307. It analyzes data from acceleration sensors and, within milliseconds, determines whether to deploy airbags and seatbelt pretensioners during a collision. This module is also known by reference numbers 608877100 and 60 688 771 00.

As the brain of the safety system, it continuously processes signals from crash sensors strategically positioned throughout the vehicle’s body. When a collision exceeding predefined thresholds is detected, the control unit sends ignition pulses to the corresponding pyrotechnic actuators.

These include not only front and side airbags but also seatbelt pretensioners, which rapidly tighten the seatbelt against the occupant to minimize movement. Therefore, the proper functioning of this unit is essential for the vehicle’s passive safety.

Why does the control unit 9654491080 fail?

The most common cause of failure for control unit 9654491080 is the storage of crash data after an airbag deployment, which blocks further functionality. Another major cause is internal hardware defects on the circuit board, where electronic components such as SMD parts, capacitors, or even the processor itself fail due to aging or moisture. The error code “internal error” typically indicates such defects.

Following a crash, so‑called crash logs or RESERVED events are stored in the control unit’s internal memory (EEPROM). For safety reasons, these data lock the module, preventing reuse without professional repair. Clearing this data is often the only way to restore the device to operational condition.

In addition, individual electronic components on the circuit board may fail. Moisture, corrosion at connector contacts, or blown fuses and capacitors can also lead to total failure or sporadic malfunctions, signaled by the airbag warning light.

How do you recognize a defect in control unit 9654491080?

A defective airbag control unit 9654491080 is primarily indicated by the airbag or SRS warning light that remains constantly illuminated or flashes intermittently in the instrument cluster. Often, the fault memory cannot be cleared, or the control unit becomes unreachable by diagnostic equipment altogether (no communication). The fault memory frequently contains entries such as “internal error.”

The most obvious symptom is the permanently lit warning light in the cockpit, signaling a problem with the restraint system and failing to extinguish after starting the vehicle as usual.

During a workshop diagnosis, it often becomes apparent that no communication can be established with the airbag control unit. The diagnostic tool receives no response, suggesting a severe internal defect.

If communication is possible, specific entries appear in the fault memory. Error codes indicating an “internal error” or “control unit defective” clearly point to hardware issues within the module, necessitating repair.

In which vehicles is control unit 9654491080 installed?

The airbag control unit with part number 9654491080 is specifically designed for models from the French manufacturer Peugeot. At Airbag24, we primarily repair this control unit for the Peugeot 307 series, with compatibility spanning the entire production run of the first generation of this model.

Specifically, this control unit is used in the following vehicle models:

Peugeot 307 I (model years 2001–2005)

Peugeot 307 I Facelift (model years 2005–2009)

How is the repair of control unit 9654491080 carried out?

Repair of control unit 9654491080 at Airbag24 follows a standardized technical process. After submitting the removed unit, the fault memory is read, and a detailed component-level diagnosis is performed. Depending on the findings, crash data are reset, defective SMD components on the circuit board are replaced, or corrosion damage is repaired. Following repair and reprogramming, a final test ensures full functionality. All repairs come with 2 years' statutory liability for defects.

First, the removed control unit is sent to Airbag24. Before any manipulation, our technicians back up existing data to ensure recovery. A visual inspection then checks for physical damage, such as corrosion or burnt components.

The actual repair involves eliminating the root cause of the fault. This may include professionally erasing crash data, replacing defective components on the circuit board using precision soldering techniques, or restoring damaged traces. If necessary, the control unit is reprogrammed to match vehicle-specific parameters.

Upon completion of the repair, the module is thoroughly tested for communication functionality and proper operation before being returned to you. This process offers a cost-effective and sustainable alternative to purchasing a new part.