Used Alfa Romeo 155 Body Control Module

The Alfa Romeo 155 (1992–1998) predates the widespread use of centralised Body Control Modules as a single, dedicated unit — its electrical functions were handled by more basic relays, fuse boxes, and individual control units rather than one integrated BCM. If you are chasing an electrical fault on your 155, the part you actually need is more likely a specific relay, the instrument cluster, the engine ECU, or one of the separate comfort/convenience modules fitted to that car. Confirm with a breaker what specific electrical symptom you have and they can advise which unit is relevant to your vehicle.

It is almost certainly a mislabelling or a loose use of the term, as the 155 did not use a single Body Control Module in the modern sense. Sellers sometimes apply the label 'BCM' to other control units such as the dashboard multiplex unit or a comfort relay board, which can cause confusion. If you have found a listing, give the part number to your breaker and check it against your car's registration before buying.

The 155 used separate units for functions that later cars combine into one BCM — these include the engine management ECU, any alarm or immobiliser module, and the instrument cluster with its own logic. Some later 155s also had a basic multiplex wiring system that controlled certain comfort functions, and it is this unit that is most often mislabelled as a BCM in breakers' listings. Tell your breaker exactly which electrical function has failed (central locking, windows, instruments, etc.) so they can identify the correct unit for your car.

Higher-specification trims such as the Cloverleaf or Q4 could have additional features like more sophisticated alarm systems or extra comfort functions compared to base models, meaning the exact modules fitted can differ between trim levels. Because the 155 did not use a unified BCM, the relevant unit for your fault will depend on which feature has stopped working rather than trim level alone. Confirm with a breaker against your specific registration to make sure you get the right unit for your exact build.

The Alfa Romeo 155 received a facelift in 1995 which brought updates to some electrical systems, so there is a realistic possibility that control units from pre- and post-facelift cars differ in specification or software. Because the 155 does not have a single BCM, the answer also depends entirely on which specific unit you are trying to source. Confirm with a breaker against both registrations before purchasing any used electrical component.