Description
The Valeo BSI J04-00 ECU is a Body Control Module designed for PSA vehicles and is commonly fitted to Peugeot 307 models. This BSI (Built-in Systems Interface) manages comfort and body electronics including central locking, interior lighting, wipers, key/immobiliser communication and interfaces with the vehicle CAN network. The unit is frequently referenced by OE numbers and product codes, making it easy to find by part number.
Technical Information
- Manufacturer: Valeo
- Model: Peugeot 307
- BSI Type: J04-00
- Product Codes: 9651197680
- Additional Numbers: 9651196980, 6580J0, 6580HS, 6580N0, 6580GW
Function And Typical Symptoms
The BSI acts as the vehicle’s comfort computer, coordinating features such as central locking, interior lights, exterior lighting signals, windscreen wipers, electric windows and communication with other control units. Common failure symptoms include erratic or non-functioning central locking, dashboard warning lights, intermittent lighting faults, loss of certain comfort functions, immobiliser or starting problems and communication errors on the diagnostic bus.
Common Causes Of Failure
- Water ingress or moisture leading to corrosion
- Electrical surges or short circuits
- Poor battery connections or repeated battery disconnections
- Degraded internal components and relays due to age
- Connector corrosion or damaged wiring
Replacement And Installation Notes
- Disconnect the negative battery terminal before starting work to avoid shorts.
- Locate the BSI (usually under the dashboard near the fuse box or behind the glovebox depending on model year).
- Remove any trim or covers, undo mounting screws and carefully unplug the multi-pin connectors.
- Install the replacement BSI, reconnect connectors and secure mounting fasteners.
- Reconnect the battery and perform diagnostic checks. Programming or key/immobiliser pairing may be required after replacement; use appropriate diagnostic equipment or professional services if necessary.
- Clear fault codes and verify all comfort functions (central locking, lights, wipers, windows) are operating correctly.
Fitment And Compatibility
Fits Peugeot 307 models equipped with Valeo BSI J04-00. Before ordering, verify compatibility by comparing OE numbers: 9651197680 is the principal reference, with other related numbers 9651196980, 6580J0, 6580HS, 6580N0 and 6580GW. This part is intended for professional mechanics and experienced DIY technicians comfortable with ECU replacement and vehicle programming.
Searching by product code or OE number is common practice for quick identification. If unsure about fitment or programming requirements, consult factory wiring diagrams or a diagnostic specialist to ensure correct installation and vehicle security.
