Description
Power Steering Battery Protection Unit for Citroën and Peugeot Vehicles with Start-Stop System.
Product Overview
This fuse/protection module (BSM) is designed to manage and protect the vehicle power supply related to steering and associated low-voltage circuits on Citroën and Peugeot models equipped with Start-Stop. It controls the distribution of battery power to critical circuits, protects against overloads and short circuits and works together with the vehicle electrical architecture to ensure reliable Start-Stop operation.
Key Functions
- Power Distribution And Protection: Routes battery power to steering and other downstream circuits while providing overload and short-circuit protection.
- Start-Stop Integration: Interfaces with the Start-Stop system to ensure safe power management during engine stop/start cycles.
- Connectorized Design: Replaces the original module with matching electrical connectors for direct fitment on compatible models.
- Fault Detection: Signals relevant fault codes to the vehicle network if a protected circuit experiences a problem.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C4, Citroën C4 II, Citroën C4 Picasso, Peugeot 3008 I, Peugeot 308, Peugeot 5008 I
- Product Codes: 9666527680, 28217166, 6500GR
- Other Numbers: OEM References Shown Above Are Common Search Terms Used By Mechanics And DIY Enthusiasts
Fitment And Compatibility Notes
This module is frequently searched by its product numbers. Always compare the physical connector layout and pin count with the original unit. Compatibility is typically determined by matching the part codes and model years of Citroën and Peugeot vehicles equipped with Start-Stop.
Installation Recommendations
- Disconnect The Battery Before Starting Work. Remove Negative Terminal First To Avoid Short Circuits.
- Access The Module Following The Vehicle Manufacturer’s Procedure—Protective Covers Or Trim May Need Removal.
- Inspect Connectors And Wiring For Corrosion Or Damage Before Reinstallation. Clean And Secure Ground Connections.
- Fit The Replacement Module Ensuring Connectors Are Fully Seated And Retaining Clips Are Engaged. Replace Any Damaged Fasteners.
- After Installation, Reconnect The Battery And Carry Out A Full System Check. Clear Fault Codes And Verify Start-Stop Operation.
- If Fault Codes Persist Or If The Vehicle Requires Parameterization, Use A PSA Diagnostic Tool (DiagBox / Lexia / PP2000) To Read And Clear Codes And To Carry Out Any Required Initialization.
Why This Part Fails — Most Common Causes
- Corrosion And Moisture Ingress: Water Or Road Salt Can Cause Connector Corrosion, Leading To Poor Contacts And Intermittent Faults.
- Voltage Spikes And Unstable Battery Condition: Weak Batteries, Improper Jump-Starts Or Voltage Surges Can Damage Internal Electronics.
- Thermal And Vibration Stress: Heat Cycling And Engine Bay Vibrations Over Time Degrade Electronic Components And Solder Joints.
- Overloads And Short Circuits: Electrical Faults Downstream Can Cause Repeated Tripping Or Internal Damage To The Module.
- Age And High Mileage: Electronic Modules Can Degrade After Several Years Of Service, Especially On Vehicles With Demanding Start-Stop Use.
Practical Tips For Mechanics And DIYers
- When Replacing The Module, Compare Part Numbers And Connector Layout; The Same-Looking Module May Have Different Internal Configuration.
- Check Battery Health And Charging System Before Replacing The Module—Many Failures Are Secondary To Battery Problems.
- Secure All Grounds And Ensure Fuse Links Are Intact To Prevent Repeat Failures.
- Keep The Vehicle Dry And Protect The Module Area From Road Spray To Extend Service Life.
