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.

Description

This BSM (Body System Module) control unit is an original-equipment style module for Peugeot 508. It manages many of the vehicle’s body electrical functions and is commonly referenced by part numbers 9674921980, 9807428180, 6500KH and code Z03-00. This listing is aimed at professional technicians and DIY enthusiasts who service Peugeot/Citroën vehicles and often search by part number to find the correct replacement.

Function And Application

The BSM is the central unit for multiple comfort and safety electrical functions on supported Peugeot models. Typical responsibilities include centralized locking, interior lighting, indicator/warning lamps, wiper and washer control, window and mirror functions, and managing inputs from switches and sensors in the passenger compartment. Replacing a faulty BSM restores correct operation of these systems when they are malfunctioning due to a failed module.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Peugeot 508
• Product Codes: 9674921980, 9807428180, 6500KH, Z03-00
• Additional Numbers: 967492.1980 / 9807428180 (cross-references commonly used by parts databases)

Replacement Procedure (Overview)

Typical replacement steps for a BSM unit on a Peugeot 508:

• Disconnect the negative battery terminal before any work to prevent short circuits and protect electronic modules.
• Gain access to the BSM—on many PSA vehicles the module is located behind trim panels in the passenger footwell or behind the glovebox. Remove necessary trim fasteners carefully to avoid damage.
• Unplug all electrical connectors and remove mounting screws or bolts securing the unit.
• Install the replacement unit, secure it with mounting hardware, and reconnect the connectors, ensuring firm seating and no bent pins.
• Reconnect the battery and verify basic electrical functions. Note that some functions may require further initialization or coding.

Installation Recommendations

• Always disconnect the battery before removal and follow the vehicle manufacturer’s instructions for airbag and electrical system safety.
• Inspect connector pins and wiring for corrosion or damage before installing the new unit; poor connections are a common cause of recurring faults.
• After fitting, check all body electrical functions (central locking, lights, wipers, windows, indicators) and run a diagnostic scan to confirm no stored fault codes remain.
• For tasks involving coding or cloning of module data, use PSA-capable diagnostic tools. If you are not equipped with OEM-level tools, consider professional assistance for programming.

Why This Part Fails

Common causes of BSM failure include water ingress or moisture causing corrosion, electrical surges or poor battery connections producing voltage spikes, connector corrosion, and damage from accidents or improper handling. Symptoms of a failing BSM include intermittent or complete loss of central locking, inoperative interior lighting, non-functioning indicators or wipers, and multiple unrelated electrical faults or warning lights.

Notes For Buyers

This unit is frequently searched for by its part numbers (9674921980, 9807428180, 6500KH, Z03-00). Ensure the listed codes match the part number required for the vehicle before purchase. Proper diagnosis is recommended to confirm the BSM is the root cause of the vehicle’s electrical faults.

Recommended Service

If coding or adaptation is necessary after replacement, have the work performed by a technician with PSA diagnostic capability to ensure full functionality and correct integration with vehicle security and comfort systems.

Overview

The BSM R03 Delphi is the engine bay junction box / body system module used on a range of Citroën and Peugeot models. It combines fuse and relay distribution with electronic control for several vehicle functions. As an OEM Delphi unit it retains original specifications and compatibility with the listed PSA vehicles, making it a practical replacement for professionals and skilled DIYers seeking an economical OEM solution.

Function

The BSM (Boîtier de Servitude Moteur) performs two main roles: safe power distribution via fuses and relays, and management of several electrical functions that can include lighting circuits, wipers, fuel pump relay, central locking feed and other engine-bay related circuits. Exact responsibilities depend on vehicle configuration and equipment level.

Compatible Models

• Citroën Berlingo B9
• Citroën C8
• Citroën Jumpy II
• Peugeot 807
• Peugeot Expert II
• Peugeot Partner Tepee

Technical Information

• Manufacturer: Delphi
• Model: BSM R03
• Product Codes: 9666700280
• Other Numbers: 9807028680, 9807028780

Installation

1. Disconnect The Battery Before Starting Work To Avoid Short Circuits And Protect Electronics.
2. Access The Engine Bay Fuse Box By Removing The Protective Cover And Any Trim Panels.
3. Label And Carefully Unplug Connectors; Avoid Pulling On Wiring Looms Directly.
4. Remove Fasteners Securing The BSM And Extract The Unit. Inspect Connectors For Corrosion Or Bent Pins.
5. Fit The Replacement Unit, Secure Fasteners, Reconnect Clean Connectors, And Replace Covers.
6. Reconnect Battery And Verify Related Systems (Lights, Wipers, Central Locking, Engine Start Circuit).
7. Note: In Some Cases The Module May Require Parameterization Or Coding After Replacement Using Dealer-Level Diagnostic Tools.

Mounting Recommendations

• Ensure All Connector Pins Are Clean And Dry; Use Dielectric Grease On Exposed Pins If Available.
• Replace Any Severely Damaged Clips Or Brackets To Prevent Vibration And Moisture Ingress Even If The Unit Still Functions.
• Secure The Unit Firmly To Avoid Movement That Could Stress Connector Cabling.
• Follow Manufacturer Torque Specifications For Fasteners Where Applicable.

Most Common Failure Causes

• Water Ingress And Corrosion Of Connectors Or Internal Contacts.
• Electrical Surges Or Short Circuits Causing Internal Component Damage.
• Overheating From Poor Ventilation Or Excessive Current Through Relays/Fuses.
• Mechanical Damage To Mounting Tabs Or Housing (Mounting Tab Damage Does Not Necessarily Affect Function).
• Connector Pin Damage Or Loose Connections Leading To Intermittent Faults.

Why Choose This Unit

This Delphi BSM R03 is an OEM replacement option for technicians and experienced DIYers who need a cost-effective module with guaranteed functionality. It is suitable where original part numbers 9666700280, 9807028680 or 9807028780 are referenced and fits the listed Citroën and Peugeot models.

Recommendation

Due to the electrical and safety-critical nature of the BSM, professional installation or at least verification with appropriate diagnostic equipment is recommended when uncertain. Always observe safe workshop practice when working on vehicle electrics.

Overview

This BSM (Body System Module) R02-00 is a direct-fit electrical control unit used on various Citroën and Peugeot models. The module manages numerous body and convenience functions such as central locking, interior lighting, power windows, exterior lights, wipers and some vehicle comfort features. Commonly referenced by part numbers 9666700180 and 9807028580, it is regularly searched for by technicians and DIYers by these codes.

Compatibility

Typical vehicle applications (please verify year/variant against your vehicle): Peugeot 5008 I, Peugeot 407, Citroën C4 Picasso, Citroën C5 X7. Also commonly cross-referenced with codes 6500FQ and 6500HK. Always check the physical connector layout and part numbering when replacing.

Installation Recommendations

Disconnect the vehicle battery before starting work and follow manufacturer procedures to avoid electrical damage. Locate the BSM (position varies by model — commonly in the engine bay or inside a fuse/relay box behind the dash). Remove any retaining clips or screws, carefully unplug wiring connectors using lock release tabs, and transfer any necessary mounting brackets or grommets. Reconnect connectors firmly and restore battery power only after the unit is securely installed. After installation, verify all controlled functions (lights, central locking, windows, wipers, interior lights) to confirm correct operation.

Technical Information

• Manufacturer: Delphi / Siemens (designation may vary by unit)
• Model: BSM R02-00
• Product Codes: 9666700180, 9807028580
• Additional Numbers: 6500FQ, 6500HK, R02-00

Most Common Failure Reasons

BSM units typically fail due to moisture ingress and corrosion of connectors or internal circuits, thermal stress from engine-bay heat cycles, electrical surges (short circuits or poor battery connections) and internal component aging. Physical damage to mounting tabs or housing does not necessarily affect electrical function — as noted, a cracked housing mount can be cosmetic only. Regular inspection of seals, connector pins and fuse box condition helps prevent failures.

Notes

This unit is offered as a fully functional used BSM. Inspect connector pins and housing condition before installation. Replacement often restores multiple body functions at once and is a common repair for intermittent or complete loss of convenience systems.

Overview

This battery charge state unit monitors and reports the condition and state of charge of the vehicle battery, helping the charging system and onboard electronics manage charging, start‑stop functions and battery diagnostics. It is designed for a range of Stellantis Citroën and Peugeot models and is commonly searched by part numbers listed below, which makes it easy for professional technicians and experienced DIYers to find the correct replacement.

Applications

Typical fitment includes (but is not limited to): Citroën C4 II, Citroën C4 Picasso / C4 Picasso II, Peugeot 3008 I, Peugeot 308, Peugeot 5008 I. Before installation verify physical fitment and connector type against the original part.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Battery Charge State Unit
• Product Codes: 9676592080, 9802043480, 6500KT
• Other Numbers: 6500KT | 9676592080 | 9802043480

Function And Symptoms

The module continuously measures battery voltage (and, depending on vehicle, current and temperature) and transmits battery state data to the vehicle network. When the unit fails, common symptoms include persistent battery warning lamp, incorrect battery charge indication, reduced charging efficiency, erratic start‑stop behavior or warning messages related to the charging system and battery health.

Why The Part Typically Fails

Failures are usually caused by environmental and electrical stresses: long‑term exposure to moisture and road salt, corrosion at connector pins, thermal cycling in the engine bay, vibration fatigue and electrical surges from a failing alternator or jump starts. In some cases repeated deep discharges or improper battery replacement (wrong battery chemistry or capacity) accelerate module failure.

Installation Recommendations

• Always disconnect the negative battery terminal before starting work to avoid short circuits and protect vehicle electronics.
• Locate the module (commonly mounted near the battery or in the engine bay electrical cluster), note connector orientation and secure mounting points before removal.
• Label or photograph connectors if necessary, then unplug harnesses and remove fasteners. Fit the replacement unit in the reverse order and ensure all connectors seat fully and locking tabs engage.
• After mechanical installation, verify charging system operation and battery parameters with a diagnostic tool. Some vehicles may require an adaptation or coding procedure to register the new unit or update battery profile parameters; use PSA diagnostic software where applicable.
• Check and clean battery terminals and earth points while the battery is reconnected to reduce the chance of future faults.

Practical Tips For Professionals

When replacing the module, inspect the battery condition and alternator output. A marginal or faulty battery can mask as module failure; replace the battery if capacity is low. Protect new modules from moisture and secure wiring to minimize vibration. Use dielectric grease on connector pins when corrosion risk is present.

Product Overview

This Power Protection and Management Module (BSM / engine fusebox) controls power distribution and protects electrical circuits on Citroën C4 II models. It centrally manages fuses and relays for the engine bay and critical vehicle electronics, helping to isolate faults and ensure reliable supply to sensors, actuators and ancillary systems. Common search references include part numbers 9665878180, 9665878080 and 6500JE.

Key Functions

• Centralized power distribution for engine and engine-bay electrical components.
• Protection of circuits via integrated fuses and relays to prevent overloads and short circuits.
• Switching and control of power to actuators, fuel system components, ignition circuits and auxiliary systems.
• Provides diagnostic points and connectors used by workshop testers to identify electrical faults.

Compatibility / Models

Designed for Citroën C4 II series vehicles. When searching for the correct part, customers often use product numbers 9665878180, 9665878080 or 6500JE—include these codes when looking up fitment.

How The Module Is Replaced

Replacement should be performed by an experienced mechanic or a competent DIYer comfortable with vehicle electrics. Typical replacement steps:

• Disconnect the negative battery terminal to avoid short circuits and protect vehicle electronics.
• Locate the BSM/power module in the engine bay (usually in a protected fusebox housing close to the battery or inner wing).
• Remove any cover panels, battery clamp or airbox components that obstruct access.
• Unplug all electrical connectors and release retaining clips—label connectors if necessary to avoid confusion.
• Unscrew or unclip the module from its bracket and fit the replacement unit, securing fasteners to the manufacturer’s torque settings.
• Reconnect connectors, reinstall removed components and reconnect the battery.
• Carry out basic electrical checks: ignition on, verify powered circuits, and clear any stored fault codes with a compatible diagnostic tool.

How Often It Fails And Why

There is no fixed service interval for this module. Failures typically occur after prolonged service life or due to environmental and electrical stress. Common causes of failure include moisture ingress, corrosion of contacts, heat and thermal cycling, vibration and electrical surges from poor battery connections or jump-starting. Symptoms of a failing unit include intermittent electrical faults, blown fuses, loss of specific electrical functions or complete power loss to engine bay circuits.

Installation Recommendation

Always disconnect the battery before removal and follow the vehicle manufacturer’s procedures to avoid damage to the module or vehicle electronics. Use correct tools and observe connector locking features. After installation, verify all related circuits and, if available, perform a system scan to clear residual fault codes. If unsure about electrical coding or multi-module interactions, have the work performed or verified by a professional workshop.

Reason Why The Part Most Often Fails

The most frequent reason for failure is moisture-related corrosion and degraded connector contacts combined with thermal stress. Engine bay location exposes the module to temperature extremes and contamination, which over time leads to poor electrical connections and malfunction.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 II
• Product Codes: 9665878180, 6500JE
• Additional Numbers: 9665878080

Practical Tips For Workshops And DIYers

• Keep replacement fuses of the correct rating on hand when performing the swap.
• Inspect connector pins and harness for corrosion or melted insulation before fitting the new unit.
• Secure module mounting to reduce vibration; loose mounting shortens service life.
• Document connector positions or photograph before disassembly to ensure correct reassembly.

This description is intended to help mechanics and knowledgeable DIYers quickly identify, assess and replace the Power Protection and Management Unit for Citroën C4 II vehicles. Use the listed part numbers when searching to improve compatibility matching and ordering accuracy.

The BSM B3 (Body System Module) manufactured by Siemens is an essential body control unit for many Citroën and Peugeot models. This unit centralizes multiple electrical functions such as lighting circuits, wiper control, central locking, power windows and monitored fuses. Supplied as a used, tested-for-functionality module with visible mounting wear possible, it is often searched by its part number 9643498880 or alternative codes 9643498880-00 / T118470003 / 6500Y3.

Technical Information

• Manufacturer: Siemens
• Model(s): Citroën Berlingo, Citroën C2, Citroën C3, Citroën C3 Pluriel, Citroën C5, Peugeot 206, Peugeot Partner
• Product Codes: 9643498880, 9643498880-00, T118470003
• Other Numbers: 6500Y3

Compatibility And Identification

Technicians and DIYers commonly find this BSM by entering its part number (9643498880) or one of the variants above. The unit fits a range of PSA-platform vehicles from Citroën and Peugeot listed in the Technical Information. Always compare product codes printed on the original module when replacing electrical control units.

Function And Symptoms

The BSM B3 coordinates many body electrical systems. Typical symptoms of a failing BSM include intermittent or complete loss of central locking, nonfunctional indicators or interior lights, erratic wiper operation, blown circuits, or multiple electrical faults appearing simultaneously. Because the BSM aggregates numerous functions, failures are often felt as multiple unrelated issues.

Replacement Procedure

• Always Disconnect The Battery Before Starting Work To Avoid Short Circuits Or Damage To The Unit.
• Locate The Unit—typically mounted under the dashboard or behind trim panels near the central fuse box or passenger footwell. Exact location depends on model and year.
• Remove Trim Panels And Any Obstructing Parts Carefully To Access The Module.
• Unscrew Fastenings And Carefully Disconnect Electrical Connectors. Note Connector Positions For Reassembly.
• Install The Replacement Module, Reconnect Connectors, Refit Fastenings And Trim, Then Reconnect The Battery.
• After Installation, Verify Functions Such As Central Locking, Lights, Wipers And Window Operation. If Any Function Remains Faulty, Check Fuses, Grounds And Connector Contacts.

Recommendation For Installation

Perform Replacement In A Clean, Dry Environment. Inspect Connectors For Corrosion And Clean Contacts If Necessary. Use Correct Tools And Torque For Fastenings. When diagnosing, start with fuses and grounds before replacing the module. If you have diagnostic equipment, read stored fault codes to narrow faults to wiring, sensors or the BSM itself.

Why This Part Commonly Fails

Common Causes Of BSM Failures Include Moisture Ingress And Corrosion, Electrical Overloads Or Voltage Spikes, Thermal Stress From Long-Term Use, And Poor Connector Contacts. Physical Damage To Mounting Tabs May Occur During Previous Repairs Or Removal, But Cosmetic Damage To Brackets Does Not Affect Electrical Functionality.

Notes For Professional Use

This unit is supplied used with a functional warranty. It is popular among professional mechanics and skilled DIY enthusiasts as a cost-effective replacement for malfunctioning body control modules. Search By Part Number 9643498880 For Fast Identification On Parts Databases And Catalogues.

This used BSM (Body System/Smart Junction Box) control unit is a direct-fit replacement option for vehicles in the Stellantis Citroën/Peugeot family and is commonly searched for by part numbers. It is ideal for professional workshops and experienced DIY mechanics who need a cost-effective remedy for electrical faults originating from the engine-bay fuse/relay module. Listed reference numbers increase search visibility and help you quickly confirm compatibility when comparing parts.

Key Features And Function

The BSM combines power distribution (fuses and relays) with control logic for multiple vehicle subsystems located in the engine compartment. Typical functions include routing power to starters, fuel pumps, cooling fans and other major consumers, distributing fused circuits and managing several body-related electrical commands. In many installations the unit also interfaces with vehicle immobilizer and central control networks, so proper diagnosis and, if required, initialization may be necessary after replacement.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: CITROËN C4 II
• Product Codes: 9674921580, 9807428080, 6500JL, 6500JN
• Other Numbers: Z01-00

Installation And Replacement

Replacement of the BSM is a moderate-difficulty job suited to trained technicians and experienced DIYers. Recommended general steps:

1. Ensure the vehicle is parked safely with the ignition off. Disconnect the negative battery terminal before any work to prevent short circuits and protect vehicle electronics.
2. Locate the BSM in the engine bay (usually under a protective cover near the firewall or inner fender). Remove any covers or trim to gain access.
3. Carefully release and unplug all electrical connectors—note locking tabs and take photos if needed to ensure correct reassembly.
4. Unscrew the mounting fasteners and remove the unit. Inspect connectors and wiring for corrosion or damage.
5. Install the replacement unit, secure mounting bolts, reconnect all connectors and replace covers. Reconnect the battery last.
6. Perform system checks: verify that lights, starter, fans and other affected circuits operate normally. If any vehicle immobilizer or key-related functions are affected, the unit may require initialization or configuration with appropriate diagnostic equipment.

Mounting Recommendations

• Always disconnect the battery before removing or installing the BSM to avoid electrical damage.
• Check connector pins and harness seals for corrosion or moisture before installation; clean and repair as needed.
• Use correct torque for mounting fasteners and ensure the unit is seated without stress on wiring to prevent vibration damage.
• After installation, run a full electrical systems check and clear any diagnostic trouble codes with suitable diagnostic tools.

Why The Part Most Often Fails

Failures are commonly caused by water ingress and corrosion, especially in vehicles exposed to road salt or with degraded seals. Thermal cycles and vibration can fatigue solder joints and internal components over time. Voltage spikes, poor battery connections and connector corrosion also lead to intermittent faults or complete failure. Proper inspection of the surrounding environment and connectors during installation greatly reduces the risk of repeated failures.

Notes For Professionals

This listing includes common OEM reference numbers to assist identification and aftermarket searching. Use a targeted diagnostic approach to confirm the BSM is the root cause of the fault before replacement—symptoms like blown fuses, multiple electrical circuits failing simultaneously or erratic engine-bay electrical behavior commonly point to the BSM.

BSM R03 DELPHI Citroën Peugeot 9807028680 is an engine fuse and relay box designed for Citroën and Peugeot cars. It is used to control and distribute electrical energy in the engine compartment and control selected car systems (pumps, fans, heating, some comfort functions, etc.). Thanks to the proper functioning of this unit, reliable operation of the engine and associated electrical components is ensured.

Manufacturer: DELPHI
Model: BSM R03
Product codes: 9807028680
Other numbers: PSA 9807028680, BSM R03 DELPHI

Use in cars (approximate):
– Citroën Berlingo B9
– Citroën C8
– Peugeot 807
– Peugeot Partner Tepee

This is a used original part from the PSA concern, which is suitable as a replacement for a defective BSM unit if the codes and design match. Compared to cheaper non-original replacements, the original quality and compatibility of the electronics with the vehicle is preserved. Minor damage to one of the plastic holders is possible, which does not affect the electrical functionality of the unit or its connection in the fuse box.

Installation recommendations:
– Always disconnect the negative terminal of the battery before removing the old unit.
– Carefully compare the code 9807028680 and the designation BSM R03 DELPHI with the original part from the car.
– Check the connectors and harnesses, clean the contacts and prevent moisture from entering the fuse box.
– When replacing, proceed according to the car manufacturer’s service manual, observe the tightening torques and correct cabling.
– After assembly, connect the battery, check the function of all powered circuits (engine start, lights, fan, other appliances) and delete any stored errors in the control units with diagnostics.

This part is suitable for both professional auto mechanics and skilled home repairers looking for a specific BSM R03 DELPHI 9807028680 unit for Citroën and Peugeot vehicles. By choosing a used original part, you can often achieve significant savings over a new unit while maintaining full functionality.

Reliable Body System Module (BSM) R04 by Delphi, suitable for a range of Citroën and Peugeot models. The BSM is the central body electronics unit that manages multiple comfort and lighting functions, relay/fuse distribution and many vehicle body features. Technically correct part numbers 9807028780 and 9807028880 are commonly used when searching for replacements, making this unit easy to find for professional workshops and DIY mechanics.

Function And Benefits

The BSM controls and distributes power to a variety of body systems: exterior and interior lighting, wipers, central locking, power windows, alarm/immobiliser interfaces and relay/fuse circuits. Replacing a faulty BSM restores interrupted electrical circuits and intermittent faults caused by failed internal electronics or corrosion.

Compatible Models

• Citroën Berlingo B9
• Citroën C8
• Peugeot 308
• Peugeot 807
• Peugeot Partner Tepee

Technical Information

• Manufacturer: Delphi
• Model: BSM R04
• Product Codes: 9807028780, 9807028880
• Other Numbers: None Specified

Installation Recommendations

• Always disconnect the vehicle battery before starting work to avoid short circuits and protect the unit.
• Locate the BSM (typically behind the glovebox or under the lower dashboard on affected Citroën/Peugeot models), remove trim panels carefully to avoid breaking clips.
• Unplug connectors by releasing locking tabs—do not pull on wiring. Support the module while removing mounting bolts.
• Fit the replacement unit, secure with original fasteners and reconnect all plugs. Ensure connectors sit fully home and locking tabs engage.
• After installation, verify all restored functions (lights, indicators, wipers, locks, windows). Some functions may require initialization or coding with PSA diagnostic equipment; if features are missing, perform adaptation with factory-level tools.
• Follow OEM torque values and routing for wiring; damaged mounting tabs reported on some units do not affect electrical function but replace or support the module if mechanical retention is compromised.

How Replacement Is Performed

Removal is straightforward for an experienced technician: disconnect the battery, remove the glovebox or trim to access the BSM, disconnect multi-pin connectors and unbolt the unit. Install the replacement in reverse order and check all body electrical functions. If certain comfort functions do not operate after fitting, perform required system initialisations or coding with appropriate diagnostic software.

Why This Part Fails Most Often

• Water Ingress And Corrosion: Moisture or condensation can corrode pins and circuit traces, causing intermittent faults or permanent failure.
• Electrical Surges Or Poor Grounding: Voltage spikes, jump-starting errors or bad earth points can damage internal electronics.
• Thermal Stress And Ageing: Heat cycles and long-term use can degrade components inside the unit.
• Physical Damage: Impact or strain on mounting tabs/connectors (often cosmetic) or broken clips from previous repairs.

Buying this BSM R04 DELPHI unit with part numbers 9807028780 / 9807028880 is a practical solution for workshops and competent DIYers who need a cost-effective replacement with a functional warranty. The unit often resolves complex electrical symptoms quickly when correctly fitted and, if necessary, adapted with the appropriate diagnostic tools.