Airbag control unit with part number 46480307

What is the function of Airbag Control Unit 46480307?

The airbag control unit with part number 46480307 is the central control module for the passive safety system in the Alfa Romeo 156 (series 932). Its primary role is to monitor the entire airbag system—including all sensors and actuators—trigger the necessary restraint devices in the event of a crash, and oversee the system’s status.

As the brain of the Supplemental Restraint System (SRS), it continuously collects and processes data from the vehicle’s acceleration sensors. In the event of a collision exceeding predefined thresholds, the control unit makes split-second decisions on which airbags and seatbelt pretensioners should deploy to provide optimal occupant protection.

After deployment, the unit stores so‑called crash data, which results in the system being locked out, necessitating repair or replacement.

Why does Control Unit 46480307 fail?

The most common cause of failure for Control Unit 46480307 is the storage of crash data following an airbag deployment. Additional faults arise from electronic malfunctions due to water damage, wiring issues, or damaged connectors linked to the SRS system.

Following a collision, non‑erasable crash data is recorded in the unit’s internal memory. This blocks the device’s functionality to prevent reuse without professional diagnostics—a safety‑critical measure that does not constitute a technical defect but requires expert intervention.

Infiltrating moisture, such as from a leaking body panel or interior water damage, can lead to corrosion on the circuit board and short circuits, often resulting in total failure or sporadic malfunctions.

The peripheral components of the control unit may also be at fault. Broken wires in the wiring harness or corroded pins at connector contacts disrupt communication with airbag sensors or igniters, which the control unit interprets as an internal error.

How do you recognize a fault in Control Unit 46480307?

A malfunctioning airbag control unit 46480307 typically manifests as a permanently illuminated or flashing airbag warning light on the instrument cluster. Additionally, accessing the unit via diagnostic equipment often becomes impossible. Read fault codes frequently indicate either an internal error or stored crash data.

The most noticeable symptom for the driver is the active airbag warning light, signaling a problem with the restraint system and indicating that airbags might not deploy in a future crash. The system must be considered inactive under these conditions.

In the workshop, a fault often becomes apparent when the diagnostic tester cannot establish communication with the control unit. It fails to respond to queries, making precise analysis of connected components impossible.

If communication is possible, specific error codes such as “Internal Control Unit Error” or “Crash Data Stored” directly confirm a defect within the unit itself, ruling out issues with external sensors or wiring.

In which vehicles is Control Unit 46480307 installed?

The airbag control unit with part number 46480307 was specifically developed for Alfa Romeo 156 models of series 932. It was used in sedan and Sportwagon variants from 1997 to 2007, including the facelift model and the sporty GTA version.

At Airbag24, we repair this control unit for the following specific Alfa Romeo models:

Alfa Romeo 156 (series 932) manufactured between 1997 and 2004

Alfa Romeo 156 Facelift (series 932) manufactured between 2002 and 2007

Alfa Romeo 156 GTA (series 932)

How is Control Unit 46480307 professionally repaired?

Professional repair at Airbag24 begins with an initial inspection to verify the fault. Subsequently, stored crash data is erased using specialized procedures, and defective electronic components on the circuit board are replaced. Following restoration, functional testing and proper coding for the vehicle are performed.

After removal from the vehicle and shipment to Airbag24, the control unit undergoes a thorough analysis. Technicians read the fault memory to pinpoint the exact cause of the issue—whether it’s a software lock caused by crash data or a tangible hardware defect.

The core of the repair involves restoring the control unit to its factory condition. This includes safely erasing crash data and, if necessary, replacing damaged components such as processors or memory modules. Upon completion, the unit is rigorously tested to ensure full functionality. We offer 2 years' statutory liability for defects on every repair.