The original BSM A6 module from Siemens for PSA cars is a motor fuse and a relay cabinet located in the engine compartment. It provides power and switching the vehicle key circuits (engine cooling, light, washer, heating fan, etc.). This is the part used from the Citroën C5 (automatic). This piece may have damage to one of the plastic holders – it does not affect the electrical function of the unit, it only serves to attach.

The

part has the exact designation BSM A6 and codes 9643100980-00 / S110500004C / 6500.Y1. To guarantee compatibility, always compare your original part number and connectors. BSM is essential for Code and Variant (A6), because different versions differ in relay and internal installation.

Exchange is usually plug & play without programming. The procedure is simple: disconnect the negative pole of the battery, release the BSM connectors, switch the bundles, move any external relays/holders and settling the unit to the original location. After installation, check the function of the powered circuits. Typical symptoms of the defect of the original BSM include the outage of some appliances, random restarts of circuits or traces of overheating/oxidation in the field of circuit breakers and relays.

Technical information

• Manufacturer: Siemens
• Model: Citroën C5 (automatic)
• Product codes: 9643100980, 9643100980-00, S110500004C, 6500.Y1
• Other numbers: BSM A6

For the correct selection, we recommend that you follow the codes and visually compare the location and color of the multi -pin connectors. If you are unsure, send us your original BSM number – we will verify compatibility. This part is an ideal choice for repairing electric defects in the engine compartment, where a quick and economic replacement of the original PSA part is needed.

BSM B3 DELPHI Citroën Peugeot 9646405280

The BSM (Boîtier de Servitude Moteur) unit type B3 from Delphi with part number 9646405280 is a vital electronic module for Citroën and Peugeot vehicles. This module is designed to manage and distribute electrical power in the vehicle’s engine compartment.

Technical Information:

• Manufacturer: Delphi, a renowned manufacturer of automotive electronic components.
• Model: BSM B3, a specific version of the unit designed for particular electrical system configurations.
• Product number: 9646405280.
• Compatibility: Designed for various models of Citroën and Peugeot cars.

Function:

The BSM B3 unit serves as the main distribution box in the engine compartment, managing and distributing electrical energy to various systems and components of the vehicle. This module ensures proper functioning and protection of electrical circuits, such as headlights, wipers, fans, and other critical systems.

Advantages:

• Efficient Power Distribution: The unit guarantees reliable and effective transfer of electrical energy to various vehicle systems.
• Circuit Protection: Integrated fuses and relays safeguard electrical circuits against overloads and short circuits.
• Reliability: High-quality components from Delphi ensure longevity and reliable performance.

Installation:

When installing the BSM B3 unit, it is essential to ensure the correct connection of all wires and connectors according to the manufacturer’s specifications. It is recommended to perform the installation at an authorized service center or with the assistance of a qualified technician to ensure the proper functionality and safety of the entire system.

Recommendations:

To maintain optimal performance and reliability of the vehicle’s electrical systems, it is recommended to use original spare parts or parts from reputable manufacturers like Delphi. The use of original parts ensures compatibility and long-term reliability, which is crucial for safe and efficient vehicle operation.

Summary:

The BSM B3 unit from Delphi (9646405280) is an essential component for the proper functioning of electrical systems in Citroën and Peugeot vehicles. Due to its high-quality construction and reliable performance, it ensures safe and efficient operation of various electronic systems within the vehicle. This module is key to ensuring that the vehicle’s electrical systems operate smoothly and securely.

The BSM B4 Siemens is a vital component designed specifically for Citroën and Peugeot vehicles. This part is essential for the optimal functioning of your car’s electrical systems, ensuring reliable performance and longevity. Commonly associated with models such as the Citroën C2, C3, C5, C8, Berlingo, Xsara, Xsara Picasso, and the Peugeot 206, 307, 406, and Partner, this unit plays a crucial role in managing various electrical and electronic functions.

Replacement and Maintenance

Replacing the BSM B4 Siemens unit is a straightforward process, typically involving disconnecting the battery, removing the old unit, and installing the new one. It’s advisable to carry out this replacement every few years or whenever you notice irregularities in electrical performance. Electrical components can fail due to various reasons such as wear and tear, exposure to moisture, or manufacturing defects.

Technical Information

• Manufacturer: Siemens
• Model: BSM B4
• Product Codes: 9650618380
• Additional Numbers: 9650618380-00, T118470004, L 6500Y3, 6500Y1

Original Siemens BSM B2 (Boîtier de Servitude Moteur) fuse and relay box for Citroen and Peugeot vehicles. This is a used part supplied with a functional guarantee. The unit may show cosmetic wear or a damaged plastic mounting clip; such damage does not affect the electrical performance when installed correctly.

Function And Common Failures

The BSM distributes power and switches key vehicle circuits including the fuel pump, cooling fan, wipers, lights and ignition. Typical symptoms of a failing BSM are intermittent starting, fuel pump dropouts, non-functioning wipers or fan and sporadic electrical faults. Failures commonly result from moisture ingress, corrosion of connector pins or overheating of internal relays.

Fitment And Compatibility

Compatibility includes, but is not limited to, Citroen Berlingo, C2, C3, Xsara, Xsara Picasso and Peugeot 206 and Partner. Always compare the BSM variant (B2), the part number 9643498980 and the connector layout with your original unit before ordering. When part numbers and connectors match, replacement is generally plug-and-play without additional coding.

Replacement Procedure

Before any work, disconnect the vehicle battery. The BSM is located in the engine bay near the battery. Release the fuse/connector locks and carefully remove the unit. Transfer fuses and relays to the replacement unit in the original configuration if required. After installation, verify fuse ratings against the vehicle wiring diagram. A correctly matched BSM operates without further programming.

Why Choose This Original Used Part

Factory Siemens quality and exact electrical compatibility with PSA wiring offer better reliability than generic universal modules. This used BSM provides an economical original-spec replacement with a functional guarantee and is often sought under the catalog numbers listed below.

Technical Information

• Manufacturer: Siemens
• Model: BSM B2 (Engine Fuse And Relay Box, under-hood)
• Product Codes: 9643498980, 9643498980-00
• Additional Numbers: 6500.Y1, 6500.Y3, T11847002

Before ordering, compare the BSM marking (B2), part number 9643498980 and the connector shape with your original unit to ensure a fast, trouble-free installation and full functionality of all powered circuits.

Function

The BSM B2 by Delphi is the engine compartment fuse and relay box responsible for power distribution and circuit protection for numerous engine-related systems. It contains fuses, relays and associated electronics that supply power to ignition circuits, cooling fans, fuel system auxiliaries, lighting and other engine bay consumers. Correct operation of the BSM ensures stable power delivery and protection against short circuits and overloads.

Fitment

Designed for Stellantis Group vehicles including Citroën and Peugeot models. Common applications include Citroën Xsara Picasso and Peugeot 206 and 307. The unit is often searched for under part numbers 9650664180 and 6500Y1.

Replacement Procedure

Before starting any work, always disconnect the negative battery terminal and follow the vehicle manufacturer’s safety procedures. Typical replacement steps:

• Locate the BSM in the engine bay (usually protected by a plastic cover near the battery or inner wing).
• Remove the protective cover and any obstructing components to gain access.
• Carefully unplug all electrical connectors, noting or photographing their positions to ensure correct reassembly.
• Remove mounting fasteners and extract the BSM. Take care with plastic clips which may be brittle.
• Install the replacement unit, secure all fasteners, reconnect connectors and replace covers.
• Reconnect the battery and verify the operation of affected systems (lights, starter, fans, etc.).

Why The Part Fails Most Often

Common causes of BSM failure include water ingress and corrosion in connectors, thermal cycling and age-related deterioration of electronic components, electrical overloads or short circuits, and mechanical damage to plastic housings or mounting clips due to vibration. As noted, broken or damaged mounting clips are frequently observed on used units but typically do not affect electrical functionality.

Technical Information

• Manufacturer: Delphi
• Model: BSM B2
• Product Codes: 9650664180, 6500Y1
• Additional Numbers: 6500 Y1

Installation Recommendations

• Always disconnect the battery before removal or installation.
• Inspect all connector pins and wiring for corrosion or damage and clean or repair as needed.
• Replace any broken mounting brackets or clips to ensure the unit is properly secured and protected from vibration.
• Use dielectric-safe contact cleaner on electrical connectors and apply contact protection if appropriate.
• After installation, perform a full electrical check of systems powered by the BSM and clear any logged fault codes if necessary.
• If unsure about disassembly/reassembly or diagnostics, seek professional service with the proper tools and diagnostic equipment.

High-quality replacement BSM B2 unit manufactured by Delphi for Stellantis Citroën/Peugeot vehicles. This used and tested unit (part number 9646405180 / 6500Y1) is suitable for garages and DIY mechanics looking for a reliable spare to restore vehicle functions quickly. The module controls vehicle systems depending on the vehicle configuration and is often searched by reference numbers 9646405180 or 6500Y1, making it easy to find for technicians and parts managers.

Fitment And Applications

Compatible with certain Citroën and Peugeot models. Typical applications include:

• Peugeot 206
• Peugeot 307

Always verify the part number (9646405180 / 6500Y1) against the unit currently fitted to the vehicle before installation.

How The Unit Works

The BSM B2 module is an electronic control unit responsible for managing a range of vehicle electrical and engine-related functions depending on the vehicle variant. It monitors inputs from sensors and switches, drives actuators and relays, and communicates with other control units on the vehicle network to ensure coordinated operation.

Replacement Procedure

• Safety First: Always disconnect the vehicle battery (negative terminal) before starting removal to avoid short circuits and protect electronics.
• Access: Remove the necessary trim panels and access covers to reach the BSM unit. Keep fasteners and clips for reuse.
• Disconnect: Unplug all electrical connectors carefully, noting locking tabs. Avoid pulling on wiring harnesses.
• Remove: Unscrew the mounting bolts and extract the unit. Inspect connectors and harness for corrosion or damage.
• Install: Fit the replacement unit and tighten fasteners to the manufacturer’s torque recommendations. Reconnect connectors and panels in reverse order.
• Commissioning: After installation, reconnect the battery and clear any stored fault codes with a diagnostic tool. Some vehicles may require adaptation/programming of the unit or keys to restore full functionality.

Installation Recommendations

• Always disconnect the battery before work and follow vehicle manufacturer procedures to avoid damage to control units.
• Check connector pins and mating surfaces for corrosion; clean if necessary before fitting the new unit.
• Use a diagnostic scanner to read and clear fault codes after installation and to confirm correct communication with other modules.
• If immobiliser or key pairing issues occur after replacement, professional service with PSA-compatible diagnostic equipment (DiagBox/PP2000/Lexia) is recommended.

Why This Part Fails Most Often

Common causes of BSM unit failure include water ingress and corrosion, electrical transients or short circuits, thermal stress from heat cycles, and mechanical damage to connectors or mounting brackets. Environmental exposure (moisture, road salt) accelerates degradation of electronic components and connector contacts.

Technical Information

• Manufacturer: Delphi
• Model: BSM B2
• Product Codes: 9646405180, 6500Y1, 6500 Y1
• Other Numbers: 6500.Y1

Why Choose This Unit

This used BSM B2 Delphi unit is supplied with a functionality warranty and is a cost-effective solution for restoring vehicle operation. Minor cosmetic damage to mounting brackets does not affect electrical performance, making this a practical replacement option for workshops and independent mechanics.

Product Overview

High-quality BSM B2 Delphi control unit suitable for many Citroën and Peugeot vehicles equipped with Delphi BSM modules. This used unit is supplied with a functionality guarantee and is intended for professional garages and experienced DIY mechanics who service vehicle electrical and control systems. Commonly referenced by product codes such as 9650664180 and 6500Y1, this module replaces faulty body/control units that cause electrical malfunctions, central locking issues, or irregular behaviour of vehicle electronics.

Key Functions

• Manages multiple vehicle electrical subsystems depending on vehicle configuration (lighting, central locking, interior electronics, signals).
• Interacts with engine and comfort systems via vehicle CAN networks where applicable.
• Provides input/output switching, diagnostics interface and protection against electrical faults within its scope of control.

Installation Notes

Replacement should be performed by a trained technician or a competent DIYer familiar with vehicle electronics. Typical replacement steps:

• Disconnect the negative terminal of the battery and wait several minutes to ensure system discharge.
• Locate the BSM unit (position varies by model: often behind glovebox, under dashboard or in the engine bay mounting points).
• Carefully release connectors and locking tabs; note connector orientations and harness routing.
• Remove mounting screws or clips, swap the unit and reattach connectors ensuring firm engagement and correct pin alignment.
• Reconnect battery and run basic checks: power-up, fault-code scan and verify controlled functions.

Technical Information

• Manufacturer: Delphi
• Model: BSM B2
• Product Codes: 9650664180, 6500Y1
• Additional Numbers: 6500.Y1., 6500Y1, 9650664180

Recommendation For Mounting

Always follow the vehicle manufacturer’s procedures when removing and fitting control units. Use correct torque for fasteners and secure all wiring harnesses to avoid chafing. After installation, perform a full systems check and clear any historical fault codes. If the vehicle requires adaptation or coding of the unit, use appropriate diagnostic equipment.

Why This Part Fails Most Often

Typical causes of BSM failure include moisture ingress and corrosion at connectors, damage from impact or improper handling, and electrical stress from voltage spikes or poor battery connections. Mechanical damage to mounting brackets is common on used units but usually does not affect the unit’s electronic functionality. Aging components and intermittent connector contact may also produce sporadic faults.

More About Reliability And Use

This used unit is offered with a guarantee of functionality. For workshops and experienced DIY mechanics it provides a cost-effective alternative to a new unit when the original module shows faults. Verify connector compatibility and product codes before installation. After fitting, perform diagnostic verification to ensure all controlled systems respond correctly.