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.

Product Overview

The BSM B5 (Siemens) is the engine service box / power distribution and control module used on certain Citroën and Peugeot models. It centralizes fuses, relays and several engine-related power circuits, providing protected power feeds for fuel pumps, injectors, sensors and actuators. This unit is commonly searched by its part numbers and fitment codes, so listing compatible codes below helps technicians and DIY enthusiasts identify the correct replacement quickly.

Why Choose This Unit

Ideal for mechanics and experienced DIYers who need a direct-fit replacement for vehicles carrying the listed codes. Restores proper power distribution and relay control to engine systems, resolving faults such as no-crank/no-start conditions, intermittent power losses, or multiple blown fuses related to the engine bay distribution harness.

Technical Information

• Manufacturer: Siemens
• Model: BSM B5 / Peugeot 307
• Product Codes: 9643498680, 9643498680-00, T118470005
• Additional Numbers: F 6500Y3, 6500Y1

Compatibility

Fits vehicles from the Citroën/Peugeot group that use the BSM B5 unit with the listed part numbers. Known fitment includes Peugeot 307. Verify the part numbers stamped on the original unit against the Product Codes and Additional Numbers above to ensure compatibility before installation.

How It Fails And Typical Symptoms

BSM units commonly fail due to moisture ingress, corrosion of connector pins, thermal stress, electrical surges or degraded internal components. Typical symptoms include:

• Engine does not crank or starts intermittently
• Multiple engine bay fuses blowing repeatedly
• Loss of power to fuel pump, injectors or critical sensors
• Intermittent electrical faults or warning lights related to engine management

Installation Recommendations

Follow these steps and precautions to ensure a safe and reliable replacement:

• Disconnect the negative battery terminal before any work on the BSM to prevent short circuits and protect sensitive electronics.
• Document the position of all connectors and harness clips. Photograph connections if needed to ensure correct reassembly.
• Carefully release retaining clips and avoid pulling on wiring; inspect connectors and pins for corrosion or damage and clean if necessary.
• Replace any damaged seals or grommets to prevent future moisture ingress.
• After fitting, restore battery power and perform a full electrical check: verify fuses, relays and powered circuits related to the BSM.
• If symptoms persist after replacement, inspect vehicle wiring and grounding points for faults that could have caused the original failure.
• For coding, immobilizer or advanced diagnostics, use appropriate PSA diagnostic equipment where required; if unfamiliar with coding procedures, seek assistance from a qualified technician.

How To Replace (Short Guide)

1. Park the vehicle on a level surface, engage the handbrake and disconnect the negative battery terminal.
2. Remove any covers or trim panels blocking access to the BSM unit in the engine bay or fuse box area.
3. Unclip and carefully unplug all electrical connectors from the BSM; label connectors if necessary.
4. Unscrew mounting fasteners and remove the old unit. Transfer any required brackets or seals to the new unit.
5. Fit the replacement BSM, secure mounting bolts, reconnect all connectors and refit covers.
6. Reconnect the battery, then verify operation of starter, fuel system and dashboard indications. Clear any logged fault codes and re-run diagnostics if available.

Most Common Cause Of Failure

Moisture penetration and connector corrosion are the leading causes of BSM failure. Poor sealing, persistent damp conditions under the bonnet, or damaged grommets allow water to reach the unit and corrode internal contacts. Electrical surges and poor grounding can accelerate internal component degradation.

Notes For Buyers

Search by the product codes listed in the Technical Information section to match your vehicle’s original unit. Installing a correctly coded and physically compatible BSM restores reliable power distribution to critical engine circuits and reduces the risk of recurring electrical faults.

This unit is compatible with Citroën C2, C3, C5, C8, Berlingo, Xsara, XSARA Picasso, as well as Peugeot 206, 307, 406, and Partner.

The product features the following technical specifications:

Technical Information

• Manufacturer: Siemens Continental
• Model: BSM B5
• Product Codes: 9650618280, 9650618280-00, 9643498680-00
• Other Numbers: T118470005, K 6500Y3, 6500Y1

This BSM module plays a critical role in managing electrical functions in your vehicle, ensuring safety and performance. It is important to replace this part if you experience electrical malfunctions, as failure of the BSM can lead to various operational issues in your vehicle.

The recommended replacement intervals depend on driving conditions, but it is advisable to inspect this unit regularly as part of your vehicle maintenance to avoid unexpected failures.

This used but fully functional Body Systems Manager (BSM) unit is designed for Citroën C5, Xsara, Xsara Picasso, and Peugeot 307 vehicles. While there may be minor cosmetic damage on some mounting brackets, this does not affect the module’s performance or reliability.

BSM units play a crucial role in managing and monitoring various electronic systems within your vehicle, including engine control and operational systems. Ensuring the proper function of these systems is essential for maintaining safe and comfortable driving. Common failures can arise due to electrical faults or wear over time, making replacement of a faulty BSM a key step in restoring your vehicle’s optimal operation.

This Siemens BSM B3 unit offers an effective and affordable solution for mechanics and DIY enthusiasts seeking to repair or maintain their vehicles’ electronic control systems. Installation is straightforward, typically involving unplugging the old module and securing the replacement in place, with no complex programming required in many cases.

Technical Information

• Manufacturer: Siemens
• Model Compatibility: Citroën C5, Citroën Xsara, Citroën Xsara Picasso, Peugeot 307
• Product Codes: 9650618480, 6500Y3, 6500Y1
• Additional Numbers: 9650618480-00 T118470003 L

Invest in this reliable Siemens BSM B3 module to ensure your vehicle’s electronic control systems perform smoothly and efficiently. Ideal for automotive professionals and car owners handling their own repairs.

This BSM B4 (Body System Module) manufactured by Delphi is a direct-fit replacement unit commonly found on selected Peugeot and Citroën models. Designed for professional garages and experienced DIYers, this module controls multiple convenience and safety functions such as central locking, interior and exterior lighting circuits, wipers, power windows and some body electrical interfaces. The unit is offered as a used part with guaranteed functionality and is an economical alternative to a new module when the original BSM has failed.

Technical Information

• Manufacturer: Delphi
• Model: BSM B4
• Product Codes: 9650663980, 6500Y1, 6500Y3
• Other Numbers: BSM B4 (Stellantis/Peugeot/Citroën applications)
• Compatible Vehicles: Citroën C8; Peugeot 206; Peugeot 307; Peugeot 807 (verify exact fitment per vehicle year and equipment)

Installation Recommendations

Before beginning, isolate the vehicle by disconnecting the negative battery terminal and wait a few minutes to discharge capacitors. Locate the BSM—it is typically mounted near the fuse box or under the dashboard on affected Peugeot/Citroën models. Remove trim panels as needed, unplug electrical connectors carefully by releasing locking tabs, and remove mounting screws. Install the replacement unit in the reverse order. After fitting, perform a full systems check: lights, locks, wipers, windows and any warning lights. Note: Replacement of a BSM may require vehicle-specific diagnostic tools for coding or synchronization with the vehicle’s immobilizer and body systems (for example DiagBox/Lexia or equivalent). If you do not have access to proper diagnostic equipment, arrange professional coding to restore full functionality.

Function And Common Faults

The BSM is a central hub for many body electrical functions—it distributes power to circuits, interprets switch inputs, and communicates with other control units. Typical symptoms of a failing BSM include intermittent or permanent loss of central locking, malfunctioning interior/exterior lights, non-working wipers, inoperative power windows, blown fuses, and in some cases starting problems or immobilizer-related warnings.

Why The Part Fails

Most common causes of BSM failure are environmental and electrical stresses: water ingress or moisture causing corrosion, degraded solder joints or internal component failure due to thermal cycling, connector corrosion, and voltage spikes from a weak battery or improper jump-starting. Physical damage to mounting tabs or connectors during previous repairs is common but may not affect electronic function—this unit may show cosmetic damage while remaining fully operational.

Practical Tips For Mechanics And DIYers

• Always check fuses and wiring harness connectors before replacing the BSM—many issues are caused by poor grounds or corroded terminals.
• Protect the replacement unit from water exposure and secure connectors with dielectric grease where appropriate to reduce future corrosion.
• Verify battery condition and charging system health to prevent repeat failures caused by voltage irregularities.
• After installation and any required coding, perform a full function test of all body systems and road-test the vehicle where needed.

This used Delphi BSM B4 offers reliable replacement value for technicians and knowledgeable enthusiasts who need a cost-effective repair solution. Use the listed product codes when searching for direct-fit compatibility or ordering replacement parts.

The BSM B4 DELPHI is a high-quality engine control unit designed specifically for Citroën and Peugeot vehicles, including models such as Citroën C8, Peugeot 206, 307, and 807. This essential electronic component ensures proper management of your vehicle’s engine functions, contributing to optimal performance and fuel efficiency.

This particular unit is a used part guaranteed to be fully functional. Please note that there may be minor damage to some mounting brackets; however, this does not affect the unit’s performance or reliability. It is an ideal choice for professional auto mechanics and experienced DIY enthusiasts looking for reliable replacement parts that offer great value.

Function and Maintenance

The BSM B4 DELPHI engine control unit regulates critical engine parameters such as ignition timing, fuel injection, and emission controls. Due to its key role in the vehicle’s electronic system, failure of this unit can lead to engine performance issues, stalling, or starting problems. Typically, these units last many years but can fail due to electrical faults or environmental factors.

Replacement of the BSM B4 DELPHI is relatively straightforward for skilled technicians: the unit is typically mounted in the engine compartment or dashboard area and connected via secure plugs. Ensure the vehicle’s battery is disconnected before removal to avoid electrical damage. After installation, the vehicle’s system may require initialization or programming to recognize the new part.

Technical Information

• Manufacturer: DELPHI
• Compatible Models: Citroën C8, Peugeot 206, Peugeot 307, Peugeot 807
• Product Codes: 9657608680
• Additional Numbers: 6500Y1, 6500Y3

Why Choose This Part?

Choosing the BSM B4 DELPHI provides confidence in restoring your vehicle’s engine management system to optimal working condition. It is especially suitable for repairing older models, offering a cost-effective solution without compromising quality. Purchasing through our e-shop guarantees access to expert advice and professional customer support to ensure compatibility and guidance through installation.

Make your Citroën or Peugeot run smoothly again with the BSM B4 DELPHI engine control unit, a trusted choice for automotive professionals and enthusiasts alike. Your vehicle’s performance and your satisfaction are our top priorities.

BSM B4 Delphi is a genuine engine bay power distribution module commonly fitted to a range of Peugeot and Citroën models. Intended for professional mechanics and experienced DIY enthusiasts, this unit manages fuses, relays and multiple vehicle circuits, so it is often searched for by its part numbers (9646405380, 6500Y1, 6500Y3). Supplied as a used part that functions correctly, it is a practical and cost-effective replacement when the original BSM shows electrical faults, intermittent failures or signs of wear.

Technical Information

• Manufacturer: Delphi
• Model: BSM B4
• Product Codes: 9646405380, 6500Y1, 6500Y3
• Other Numbers: Frequently referenced on Peugeot/Citroën parts lists for compatible body/fusebox assemblies

Function And Symptoms

The BSM (Body/Service Module) is the engine bay fuse and relay box that distributes power to many vehicle systems — lighting, wipers, fuel pump relay, starter circuits and other auxiliaries. When the BSM develops faults you can see symptoms such as blown fuses, loss of specific electrical functions, intermittent operation of lights or wipers, and in some cases starting problems. Diagnosing a faulty BSM typically follows elimination of wiring, grounds and individual components.

Compatibility

Commonly fitted to models including Citroën C8 and Peugeot 206, 307, 807. Buyers often search by the part numbers listed above — verify compatibility by comparing part numbers and connector layout with the unit being replaced.

Installation Recommendations

• Disconnect the negative battery terminal before starting work to avoid short circuits and protect vehicle electronics.
• Locate the BSM in the engine bay (usually under a protective cover). Remove the cover and any mounting screws or fasteners.
• Carefully unplug all electrical connectors — release locking tabs to avoid connector damage. Note connector positions or take photos for correct reassembly.
• Remove the old unit and mount the replacement BSM; ensure it is seated and secured. Reconnect connectors and re-fit any covers.
• Reconnect the battery. Clear any stored error codes and check affected functions. In many cases the BSM is plug-and-play, but clearing fault codes with a diagnostic scanner may be required to restore normal operation.
• Observe safety: avoid force on plastic tabs, and ensure tight, corrosion-free connections.

Why This Part Fails

• Corrosion and Moisture Ingress: Water or condensation in the engine bay can corrode pins, relays and fuse contacts.
• Thermal Stress: Long-term heat cycles in the engine compartment can degrade plastic housings and internal components.
• Vibration And Mechanical Damage: Repeated vibration or impact can break mounting tabs or damage solder joints and connectors.
• Electrical Overloads: Short circuits or repeated blown fuses may indicate internal damage to the module.

This used Delphi BSM B4 is a cost-effective replacement for vehicles showing the electrical symptoms above. The unit may show cosmetic wear or minor damage to mounting tabs (which does not affect function), and it is supplied with a warranty of functional operation. Ideal for mechanics and skilled DIYers who need a reliable parts-sourced solution quickly and by part number lookup.

The BSM B4 DELPHI control unit is a crucial electronic module designed specifically for Citroën and Peugeot vehicles, including models such as Citroën C8, Peugeot 206, 307, and 807. This used part guarantees full functionality and is a reliable choice for both professional auto mechanics and car enthusiasts who prefer DIY repairs.

This unit manages various electronic systems within the vehicle, ensuring optimal engine performance and smooth operation of connected electrical components. Although some mounting brackets may show minor damage, this does not affect the control unit’s functionality, making it a cost-effective and dependable replacement part.

Technical Information

• Manufacturer: DELPHI
• Models: Citroën C8, Peugeot 206, Peugeot 307, Peugeot 807
• Product Codes: 9644038580, 6500Y1, 6500Y3
• Additional Numbers: BSM B4

Installation & Maintenance

The BSM B4 DELPHI control unit is typically installed in the engine compartment, connected to the vehicle’s main wiring harness. Replacement involves carefully disconnecting the old unit and mounting the replacement using original mounting points. It is recommended to check the electrical connections and ensure secure mounting for optimal performance.

Such control units usually last for many years but can fail due to electronic component wear or damage from power surges or moisture. Replacing a faulty unit helps restore proper electronic management of the engine and other vehicle functions.

Why Choose This Part?

Opting for this BSM B4 DELPHI control unit ensures your Citroën or Peugeot maintains reliable electronic control essential for efficient engine management and safety systems. It offers a balance of quality and affordability, ideal for repair shops and DIY mechanics alike.

Enhance your vehicle’s performance and safety with this essential part. Ordering is straightforward, allowing you to quickly restore your car’s electronic systems and get back on the road with confidence.

This BSM B2 Siemens body/electrical control module is a direct-fit used replacement for a range of Citroën and Peugeot models. The unit handles distribution of fuses and relays and coordinates multiple body electrical functions, making it a common failure point when vehicles suffer from age-related wear, moisture exposure or wiring issues. Supplied as a tested, functioning used part, it is a practical and cost-effective option for professional workshops and DIY enthusiasts performing repairs on PSA group cars.

Compatibility And Typical Applications

Fits Common Models:

• Citroën Berlingo
• Citroën C2
• Citroën C3
• Citroën Xsara
• Citroën Xsara Picasso
• Peugeot 206
• Peugeot Partner

Matches Several Manufacturer Numbers Commonly Queried By Mechanics And Owners, Increasing The Chance Of Quick Discovery Via Search Engines When Searched By Part Number.

How The Part Functions

The BSM Is The Central Module For Several Body Electrical Systems. It Distributes Power To Fuses And Relays And Oversees Circuits Such As Interior Lighting, Indicator Signals, Central Locking, Wiper Control Inputs, And Other Comfort/Body Functions. A Faulty BSM Can Cause Multiple Symptoms Ranging From Non-Working Lights And Central Locking To Intermittent Electrical Faults.

Replacement Procedure (Overview)

• Prepare: Park On A Level Surface, Switch Off Ignition And Remove Key.
• Safety First: Disconnect The Negative Battery Terminal Before Any Work On The Module.
• Access: Remove Any Trim Or Covers To Reach The BSM—Location Varies By Model (Engine Bay Or Passenger Compartment). Follow The Vehicle Manufacturer’s Removal Steps.
• Disconnect: Unplug Electrical Connectors Carefully And Remove Mounting Fasteners.
• Install: Fit The Replacement Unit, Secure Fasteners, Reconnect Plugs And Reattach Trim.
• Restore Power: Reconnect Battery And Verify Basic Functionality. Some Vehicles May Require Diagnostic Initialization Or Coding For Full Functionality.

Installation Recommendations

• Always Disconnect The Battery Before Starting Work To Avoid Short Circuits Or Damage To The Module.
• Inspect Wiring Harnesses And Connector Pins For Corrosion Or Damage; Clean Or Repair As Required.
• Use Correct Torque On Fasteners And Ensure Brackets Secure The Module To Avoid Stress On Connectors.
• After Installation, Check All Affected Functions (Lights, Locking, Wipers, Indicators) And Clear Any Stored Fault Codes With Appropriate Diagnostic Equipment.
• When Coding Or Initialization Is Required, Use Service-Grade PSA Diagnostic Tools For Reliable Results.

Reason Why The Part Fails Most Often

Failures Are Usually Related To Ageing, Moisture Ingress, Corrosion At Connector Pins, Thermal Stress And Intermittent Electrical Contacts. External Damage To Mounting Brackets Does Not Necessarily Affect Electrical Function, But Water Entry Or A Damaged Connector Will Often Lead To Malfunctions. Harsh Operating Environments And Repeated Electrical Overloads Can Also Shorten The Module’s Service Life.

Technical Information

• Manufacturer: Siemens
• Model: BSM B2
• Product Codes: 9650618580, 9650618580-00, 964349898
• Additional Numbers: U11847002 J, 6500Y1, 6500Y3, t11847002

If You Are A Professional Mechanic Or An Experienced DIY Enthusiast, This BSM B2 Is A Practical Replacement Option For Repairing Electrical Faults On Compatible Citroën And Peugeot Vehicles. Follow The Above Safety And Installation Recommendations To Ensure Reliable Operation After Fitting.

The BSM B3 Delphi is a body control module (BCM) commonly used on a range of PSA vehicles. Supplied as a used unit in full working order, it represents a cost-effective replacement for failed or intermittent original modules. Technically minded mechanics and experienced DIYers will appreciate that this unit handles multiple comfort and body functions; it is often sought by product number (9650664080, 6500Y1, 6500Y3) when sourcing a direct-fit replacement.

Technical Information

• Manufacturer: Delphi
• Model: BSM B3
• Product Codes: 9650664080, 6500Y1, 6500Y3
• Additional Numbers: Common References: 9650664080 / 6500Y1 / 6500Y3

Features And Function

The BSM (Body System Module) controls multiple vehicle body systems such as central locking, interior and exterior lighting circuits, wiper park detection and intermittent control, some power window functions, alarm inputs/outputs and a range of switched power relays/fuses. As a central node in the vehicle body network, the BSM routes signals between switches, sensors and actuators and provides fused power distribution for several circuits.

Compatibility And Fitment

Typical fitment includes various Citroën and Peugeot models. Known compatible models include Citroën C8 and Peugeot 307, 406, 807. Always refer to the product codes (9650664080 / 6500Y1 / 6500Y3) when confirming compatibility; many technicians search by these numbers to locate the correct unit.

Installation Recommendations

Installation should be performed by a competent mechanic or an experienced DIYer with appropriate tools. Recommended steps:

1. Disconnect the negative battery terminal before any work to prevent short circuits and protect electronic modules.
2. Locate the BSM—on PSA vehicles it is typically mounted in the passenger compartment fusebox area or behind lower dash panels; consult a vehicle repair manual for exact location.
3. Remove trim panels and unscrew the unit. Carefully release electrical connectors using appropriate terminal release techniques to avoid damaging connector locks.
4. Inspect and clean connector pins and harness seals before mating the replacement unit to ensure good contact and prevent future corrosion-related faults.
5. Fit the replacement unit, secure mounting fasteners, reconnect connectors and reassemble panels. Reconnect the battery last.
6. After installation verify all controlled functions (locks, lights, wipers, windows, alarm) and check for fault codes with a diagnostic tool. If any functions are lost, additional configuration or adaptation may be required.

Why This Part Most Commonly Fails

• Moisture Ingress and Corrosion: Exposure to damp, leaking windscreen seals or condensation can corrode connectors or PCB traces.
• Connector And Pin Damage: Poor contact, oxidized pins or mechanical stress on connector bodies causes intermittent operation.
• Relay Or Component Wear: Internal relays, solder joints or electronic components can degrade over time, especially under heavy load or thermal cycling.
• Electrical Faults/Shorts: Overcurrent events, water-related shorts or incorrect jump-start procedures may damage the module electronics.
• Mechanical Damage To Mounting Tabs: Plastic mounting brackets may be cracked or broken on used units; this typically does not affect electronic function but should be noted.

Practical Tips

When replacing a BSM, check and clean the mating connectors, secure a good ground, and verify fuse and relay integrity. Because this is a used unit, inspect housing and connectors carefully. After fitting, run a full function check and clear/scan for stored fault codes to confirm correct operation.