Description
Engine BSM B2 DELPHI. This is a used part with a functional warranty. Some of the mounting brackets may be damaged – does not affect functionality.
The BSM B2 (Delphi) is an engine/body systems module used on a range of PSA Group vehicles. It combines power distribution (fuses/relays) and several electronic control/interfacing functions required by the engine management and vehicle wiring. This unit is a direct-fit replacement for vehicles using part numbers listed below and is suitable for professional workshops and DIY mechanics who need a reliable replacement module.
Technical Information
- Manufacturer: Delphi
- Model: BSM B2
- Product Codes: 9657608880
- Additional Numbers: 6500Y1, 6500Y3
Compatibility (examples)
Commonly fitted to PSA small/medium cars. Examples of compatible models include Peugeot 206 and Peugeot 307, and many related Citroën/Peugeot variants that use the same BSM part numbers. Always check the part number against the unit on the vehicle.
Function
The BSM serves as a central power-distribution and control module: it houses fuses and relays, provides protected power feeds to engine and body systems, and interfaces with other control units. Faults in the BSM can lead to loss of power to circuits, starting issues, lighting faults or intermittent electrical problems.
Replacement Procedure (general guidance)
- Disconnect the negative battery terminal before starting work.
- Locate the BSM in the engine bay (mounted near the fuse/relay area or on the inner wing depending on model).
- Label and carefully unplug all electrical connectors; release any locking tabs to avoid damaging pins.
- Remove mounting fasteners and extract the unit. Note any broken mounting clips — they often do not affect electrical function but may require repair for secure fitting.
- Install the replacement BSM, secure fasteners, reconnect all plugs and ensure connector locks are engaged.
- Reconnect the battery and verify vehicle electrical functions. Clear any stored fault codes where required.
Installation Recommendations
- Always disconnect the battery before removal/installation to prevent short circuits and avoid damaging the module.
- Use basic hand tools and take care with connector locking mechanisms; apply dielectric grease to terminals if connectors show corrosion.
- Check fuse and relay layout after installation and replace any faulty fuses/relays with correct specification parts.
- If the vehicle displays immobilizer or persistent communication faults after replacement, a diagnostic tool may be needed to read and clear fault codes.
Why This Part Fails Most Often
Common causes of BSM failure include water ingress and corrosion (especially if seals or clips are damaged), heat-related stress on solder joints or internal components, and mechanical damage to mounting points or connector housings. Electrical faults upstream (short circuits, incorrect jump-starting) can also damage the unit.
