Description
Power Supply Protection Unit for Battery-Powered Steering for Citroën and Peugeot Vehicles
This OEM-style fuse and protection module is designed for Citroën and Peugeot vehicles and carries the common Stellantis part numbers used by garages and DIY mechanics. The module protects and distributes battery power to critical engine-bay systems including steering-related circuits, fuses and relays. It is often searched for by its product codes (9666527680, 28236841, 6500GR) and is suitable for professionals and experienced home mechanics who replace or diagnose power distribution faults in the engine compartment.
Key Benefits
– Direct replacement for original equipment part numbers to restore proper power distribution and circuit protection.
– Durable construction with integrated fuse/relay holders for a compact engine-bay installation.
– Reduces risk of erratic electrical behavior caused by damaged or corroded fuse modules.
Typical Applications
Fits a range of Citroën and Peugeot models where this type of engine fuse/relay module (often referred to as BSM) is specified. Common fitment includes:
- Citroën C4
- Citroën C4 II
- Citroën C4 Picasso
- Peugeot 3008 I
- Peugeot 308
- Peugeot 5008 I
Installation Recommendations
Follow these steps to replace the unit safely:
- Disconnect the negative battery terminal before starting work to avoid short circuits and component damage.
- Locate the module—typically mounted in the engine bay near the battery or inner wing; remove any protective covers.
- Carefully unplug all wiring connectors and release retaining clips; note the position of fuses/relays if reusing them.
- Remove mounting fasteners and install the replacement module, securing it to the original torque specification where applicable.
- Reconnect connectors, re-fit covers, and reconnect the battery. Verify all related systems (lighting, starter, steering assistance circuits) function correctly.
Use correct insulated tools and wear protective gloves. If multiple fuses or relays were damaged, replace with correctly rated components only.
Why This Part Most Commonly Fails
- Water Ingress And Corrosion: Moisture in the engine bay can corrode contacts and fuse holders, causing intermittent or permanent failures.
- Thermal Stress And Aging: Repeated heating and cooling cycles degrade plastic housings and connector seals over time.
- Electrical Surges Or Short Circuits: Overloads can blow internal fuses or damage internal circuitry.
- Mechanical Damage: Impact from collisions or improper handling during repairs can break mounting points or connectors.
- Poor Connections: Loose terminals or contaminated contacts generate heat and can lead to failure.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model(s): Citroën C4; Citroën C4 II; Citroën C4 Picasso; Peugeot 3008 I; Peugeot 308; Peugeot 5008 I
- Product Codes: 9666527680; 28236841; 6500GR
- Other Numbers: 28236841 | 6500GR | 9666527680
Additional Notes
Often referred to in parts catalogs as the engine fuse/relay module or BSM. When replacing this unit, verify the condition of fuses, relays and wiring harnesses; damaged wiring or recurring blown fuses indicate an underlying fault that must be diagnosed and repaired to avoid repeat failures.
Recommended For
Automechanics and competent DIYers who require a direct-fit power protection/fuse module for affected Citroën and Peugeot models and who are comfortable working on vehicle electrical systems.
