Description
Overview
The Delphi BSM B2 is an engine-bay fuse and relay box (BSM) used on various PSA vehicles including Citroën and Peugeot. This is a used original unit guaranteed functional. It distributes power and controls switching for critical circuits such as headlights, wipers, fuel pump, radiator fan and ignition, helping to restore stable electrical operation after a failing BSM.
Function And Common Failures
The BSM B2 combines fuses, relays and switching logic to protect and route power to multiple systems. Typical failure symptoms include intermittent or permanent loss of electrical circuits, non‑operational fuel pump, radiator fan running uncontrollably, malfunctioning lights or wipers and difficulty starting. Common causes are age‑related oxidation of contacts, moisture ingress and thermal stress or fatigue of soldered joints and relays.
Fitment And Compatibility
This part corresponds to the BSM B2 Delphi unit and is identified by OEM codes 9650664180 and 6500.Y1. Fitment can vary between PSA models; always confirm compatibility by comparing OEM numbers, the BSM type (B2), multi‑pin connector shapes and the fuse/relay layout with your original unit. When in doubt, match the product codes and connector arrangement to ensure full compatibility.
Replacement Procedure
- Park the vehicle on a level surface and switch off the ignition.
- Disconnect the negative battery terminal before any electrical work.
- Open the engine bay and locate the BSM (commonly near the battery).
- Release the securing clips and carefully unplug the multi‑pin connectors.
- Note the positions of fuses and relays; transfer them if the replacement does not match exactly.
- Install the replacement unit of the same type, reconnect connectors and secure the clips.
- Reconnect the battery, check fuse values and perform a basic diagnostic scan to clear any stored faults.
Condition Notes
This listing is for a used original Delphi unit guaranteed functional. The part may show cosmetic damage to some plastic retainers or mounting clips; such cosmetic issues do not affect electrical performance. It is a practical and economical replacement, particularly suited for older PSA vehicles where rapid repair is required.
Technical Information
- Manufacturer: Delphi
- Model: BSM B2 (Engine Bay Fuse/Relay Box – PSA)
- Product Codes: 9650664180, 6500.Y1 (6500Y1)
- Additional Numbers: PSA Designation: BSM B2
Ideal for professional mechanics and DIY enthusiasts, this Delphi BSM B2 provides a quick way to resolve electrical faults originating from the fuse/relay module. Always verify OEM codes and connector layout before installation to guarantee proper fitment.
