Description
Power supply protection unit on the battery for Citroën and Peugeot vehicles.
The Battery Fuse/Protection Module (BSM) for Citroën and Peugeot models is a critical power distribution component designed for professional workshops and experienced DIY mechanics. Supplied under OEM references 9666527680 / 28236841 / 6500GR, this unit centralizes fuses and relays, protects battery-fed circuits and ensures reliable power delivery to the vehicle’s electrical systems. Ideal for technicians searching by part number, the module restores proper power management after electrical faults, collisions or component failures.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Battery Fuse/Protection Module (BSM)
- Product Codes: 9666527680, 28236841, 6500GR
- Other Numbers: OEM References Used By Stellantis
Compatibility
Compatible With Selected Models: Citroën C4, Citroën C4 II, Citroën C4 Picasso, Peugeot 3008 I, Peugeot 308, Peugeot 5008 I. Always verify the part number matches the original module on the vehicle before installation.
Function And Typical Behavior
The module houses multiple fuses and relays and acts as the main distribution point for battery power. It protects downstream circuits from overloads, manages relay switching for high-current consumers and contributes to overall vehicle electrical safety. In some vehicle variants the module also monitors voltage and can isolate circuits in fault conditions.
Installation Recommendations
Before Any Work, Disconnect The Battery And Follow Manufacturer Procedures To Prevent Damage. Locate The Module—Usually Near The Battery Or In The Engine Bay—Remove The Cover, Document Connector Positions (Photos Recommended) And Carefully Disconnect Connectors. Inspect Contact Surfaces For Corrosion Or Heat Damage. Replace The Module, Reconnect All Plugs Securely And Refit Covers. After Installation, Check All Affected Electrical Functions And Fuses. Use Appropriate Tools And Protective Equipment.
Why The Part Fails Most Often
Common Causes Of Failure Include Corrosion And Water Ingress, Thermal Stress From Repeated Overloads Or Poor Connections, Blown Internal Fuses Due To Short Circuits, And Damage From Incorrect Jump-Starts Or Faulty Charging Systems. Mechanical Impact From Accidents Or Engine-Bay Debris Can Also Compromise The Housing Or Internal Components.
Recommended Workshop Tips
- Inspect Wiring Harnesses And Ground Connections When Replacing The Module.
- Clean Corroded Terminals And Apply Dielectric Grease Where Appropriate.
- Replace Any Suspect Fuses Or Relays Rather Than Reusing Damaged Parts.
- Verify Battery Health And Charging System Performance To Avoid Recurrence.
Notes For Mechanics And DIYers
This module is a safety-critical component. While replacement is straightforward for experienced technicians, ensure all safety precautions are followed. If uncertain about diagnosis or if additional electrical faults persist after replacement, consult factory documentation or a qualified workshop with access to Stellantis service information.
