Fuse Module Citroën Peugeot 9666527680 28217166 6500GR

Description

Power steering supply protection unit powered from the battery for Citroën and Peugeot vehicles with Start-Stop system.

High-quality replacement fuse/power distribution module designed for Citroën and Peugeot models with Start‑Stop functionality. This battery-fed protection unit (BSM-type application) safeguards the electrical feed to steering-related circuits and other downstream consumers, helping to prevent overloads and ensure reliable Start‑Stop operation. Commonly searched by part numbers 9666527680, 28217166 or 6500GR, this unit is suitable for professional workshops and experienced DIY mechanics who need a direct-fit, OEM-compatible component.

Technical Information

• Manufacturer: Stellantis / Citroën Peugeot (OEM)
• Model: Citroën C4; Citroën C4 II; Citroën C4 Picasso; Peugeot 3008 I; Peugeot 308; Peugeot 5008 I
• Product Codes: 9666527680; 28217166; 6500GR
• Additional Numbers: 28236841 (cross reference)

Function And Application

This module acts as a power distribution and protection point for circuits supplied directly from the vehicle battery, with particular attention to steering assistance and Start‑Stop related loads. It contains fuse and relay interfaces and monitoring points that disconnect or protect circuits in the event of overload, short circuit, or abnormal voltage conditions. Correct operation helps maintain steering assist availability and protects sensitive electronics during frequent Start‑Stop cycling.

Replacement Procedure

1. Park the vehicle on a level surface, engage the parking brake and switch off all electrical loads.
2. Disconnect the negative battery terminal and wait a few minutes to allow capacitors to discharge.
3. Locate the BSM/fuse module in the engine bay (consult vehicle-specific manual for exact position).
4. Carefully unplug electrical connectors and release retaining clips or bolts securing the module.
5. Remove the old unit and fit the replacement, ensuring correct orientation and clean connector pins.
6. Reconnect connectors, secure the module, reconnect the battery and perform functional checks (ignition on, Start‑Stop function and steering assist verification).
7. Clear any fault codes if present and re-check after a short test drive.

Installation Recommendations

• Always disconnect the battery before starting work to avoid short circuits and ECU damage.
• Inspect connector pins for corrosion or damage and clean contact surfaces before assembly.
• Use correct torque for mounting bolts and ensure seals/gaskets are intact to prevent water ingress.
• After installation, perform a full electrical system check and monitor Start‑Stop and steering assist behavior.
• If fault codes persist, diagnose wiring and related sensors/actuators before replacing the unit again.

Common Failure Causes

• Water Ingress And Corrosion: Exposure to moisture leads to connector corrosion and internal failures.
• Thermal Stress And Aging: Repeated high-current events and heat cycles degrade internal components over time.
• Electrical Overload Or Short Circuit: Faulty downstream wiring or components can cause overload and damage the module.
• Poor Ground Or Loose Connections: Increased resistance causes heating and intermittent faults affecting Start‑Stop and steering supply.
• High Cycling From Start‑Stop Systems: Frequent engagement increases wear on protective elements and relays.

Notes For Professionals And DIY Mechanics

This unit is intended for vehicles originally equipped with a BSM-type power/fuse module and is often referenced by the part numbers above. Suitable workshop tools and diagnostic equipment are recommended for final checks. Replacing this module typically restores reliable power distribution when failures are caused by internal damage, corrosion or blown protection elements.