This BSC A02-00 Siemens VDO body control module (BCM) is a direct-fit control unit removed from a Peugeot 407. It controls multiple vehicle body functions and is identified by common PSA product codes listed below. Ideal for professional workshops and experienced DIY mechanics looking for an exact replacement unit for vehicles using the same BSC specification.

Product Overview

The BSC (Body System Controller) A02-00 is a central electrical module that manages lighting, central locking, interior electronics, alarm and convenience functions depending on vehicle configuration. Manufactured by Siemens VDO for Stellantis (Citroën/Peugeot), this unit is often referenced by part numbers to ensure correct fitment. Replacing a faulty BSC restores reliable operation of body functions and eliminates faults caused by intermittent signals or failed outputs.

Technical Information

• Manufacturer: Siemens VDO
• Model: BSC A02-00
• Product Codes: 9656148080, S120017003I
• Other Numbers: 6580S9, 6580XF, 9688EL

Compatibility and Fitment

Unit Removed From: Peugeot 407. The module is used across certain PSA/ Stellantis vehicles that share the same BSC A02-00 specification and product codes. Always compare the listed product codes with the unit fitted to the vehicle to confirm physical and electrical compatibility.

Installation

Installation should be performed by a qualified technician or an experienced DIY mechanic familiar with vehicle electrical systems. Typical replacement steps:

• Disconnect the negative battery terminal before starting to avoid short circuits and protect the electronics.
• Remove any trim panels and securing fasteners to access the module—location varies by model (commonly under dashboard or glovebox area).
• Unplug connectors carefully, noting locking tabs to avoid damage. Remove the old unit and fit the replacement in the reverse order.
• After mechanical installation, unit commissioning/coding may be required for full functionality.

Mounting and Coding – Important

• The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Options For Commissioning:
  1. Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
  2. Virginization And Subsequent Initialization/Telecoding Via DiagBox (Or Online) + Key Adaptation.
• Recommended To Be Performed By A Specialist With PSA Service Equipment (DiagBox/Lexia/PP2000).
• Always Disconnect The Battery Before Removal/Installation And Follow The Manufacturer’s Procedure To Avoid Damaging The Unit.

Why This Part Fails

Common failure causes for BSC/BCM units include water ingress and corrosion, connector or wiring damage, solder joint fatigue from thermal cycling, and voltage spikes or poor battery connections. Symptoms of a failing unit are intermittent operation of lights, central locking faults, warning lamps, or loss of certain comfort functions.

Service Recommendations

When replacing the BSC unit, inspect wiring harnesses and connectors for corrosion or damage and repair as necessary. If possible, clone the original module data to the replacement to preserve vehicle-specific settings and minimize coding requirements. If virginizing and coding is necessary, perform using appropriate PSA diagnostic tools and follow prescribed procedures.

This listing includes the unit as described and provides the product codes used for identification. For workshop use, keep the original unit and connectors available during commissioning to assist with cloning or key adaptation if required.

• Manufacturer: Siemens
• Model: BSC A01-00
• Product codes: 9655471880, 9688EL, S120017004G
• Other numbers: 9655471880 9688EL

BSC A01 00 from Siemens is a control unit that is in the category of electrical components. It is specially designed for highly demanding operating conditions and is able to guarantee the efficient operation of the car. This unit ensures proper communication between the vehicle’s various electrical systems, which is essential for its trouble-free operation. Installation of this part is standard and does not require special tools, however we recommend professional installation to ensure proper and safe operation of your vehicle. If you are an experienced auto mechanic or knowledgeable about auto repair, installation should not be a problem for you. Buy with confidence! The part offered has been carefully tested and is regularly inspected to meet our high quality standards. Also, remember that since these are used parts, they may show slight signs of wear, but this does not affect their functionality. With this control unit, you can be sure that your Citroën or Peugeot vehicle will work like new again. Don’t wait and take the necessary steps to restore your car’s performance today!

Original control unit/electronic module Siemens VDO BSC A01-00 for PSA cars (Citroën/Peugeot). This is a used, fully functional disassembled part – an ideal replacement for the original non-functional unit. Thanks to the exact OE numbers, you can easily verify compliance and avoid unnecessary returns.

Key benefits
– Original Siemens VDO PSA part – reliability and long service life
– Accurate identification by OE/catalog numbers
– An advantageous alternative to a new part, without the need to compromise on quality

OE and serial numbers to search
– PSA OE: 9656147980
– Alternative PSA code: 9688EL
– Siemens VDO: BSC A01-00
– Production designation Siemens VDO: S120017004H, S120017004I
Note: If your original part bears any of the above numbers, there is a high probability of compatibility.

PSA vehicle compatibility
– Citroën: C4, C5 II, C8, Jumpy II
– Peugeot: 307, 308, 407, 807, Expert II
For selected years and engines. Always verify compatibility by the OE number on your original unit, or by the VIN in diagnostics (Diagbox/ServiceBox).

Technical information
– Type: electronic control module (Siemens VDO BSC A01-00)
– Manufacturer: Siemens VDO
– Group of parts: electrical components – control units
– Condition: used original part from disassembly
– Packaging: 1x control unit

Assembly and coding
– In some cases, coding/pairing with the vehicle (immobilizer, configuration data) may be required. We recommend that assembly and any programming be carried out by an expert with PSA software support (Diagbox).
– Before assembly, compare the numbers on the unit nameplate and visually inspect the connectors and harnesses.

How to verify part compliance
– Fastest by comparing OE/PSA numbers (9656147980, 9688EL) and production codes (S120017004H/I, BSC A01-00) to your original unit.
– In case of uncertainty, send us the VIN – we will be happy to verify compatibility.

This product will help resolve issues such as broken electronic circuits, unit error messages, or powered circuit failures if they are caused by a defect in the original module. By choosing a genuine used part, you get the right specification for PSA Citroen/Peugeot cars while maintaining a favorable price.

Used trailer control unit BSC B04-00 engineered to restore trailer connection functions on compatible Citroën and Peugeot models. Suitable for professional workshops and experienced DIY mechanics, this unit manages trailer detection, lighting outputs and CAN-bus communication with the vehicle body systems to ensure safe towing and correct signalling. Commonly searched by product codes such as 9678751080, S180085005A and 9688EL.

Technical Information

• Manufacturer: Siemens VDO / Continental
• Model: BSC B04-00
• Product Codes: 9678751080; S180085005A; 9688EL
• Other Numbers: B03-00; B04-00
• Compatible Models: Citroën Berlingo III; Citroën C4 Picasso; Peugeot 3008 I; Peugeot 5008 I; Peugeot Partner III

Installation And Coding – Important

• The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
• Options for commissioning:
  1. Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
  2. Virginization and subsequent initialization/telecoding via DiagBox (or online) + key adaptation.
• Recommended to be performed by a specialist with PSA service equipment (DiagBox/Lexia/PP2000).
• Before removal/installation always disconnect the battery and follow the manufacturer’s procedure to avoid damaging the unit.

Installation Recommendations

Access to the BSC unit typically requires removal of interior trim or protective covers. General safe replacement steps:

• Disconnect the negative battery terminal before any work to prevent short circuits and unit damage.
• Locate and remove the covering panels to access the unit (refer to the vehicle repair manual for exact location and removal sequence).
• Label and carefully unplug connectors. Inspect pins and connectors for corrosion or bending.
• Remove fasteners, extract the old unit and fit the replacement in the original orientation. Reconnect connectors securely and reinstall fasteners.
• Complete commissioning by cloning or telecoding as required (see Installation And Coding – Important).

Why The Part Most Commonly Fails

• Water ingress and corrosion from damaged seals or exposed wiring, especially on vehicles used for towing in wet conditions.
• Electrical faults caused by short circuits or incorrect trailer wiring (overloads can damage outputs).
• Connector damage and pin corrosion from vibration or improper mating during trailer connection.
• Software or configuration faults after battery replacement or module replacement that require cloning or reinitialization.

Fitment And Practical Notes

When searching for the correct unit, use the product codes listed above. The unit is intended for the listed Citroën and Peugeot models but compatibility depends on the vehicle’s original configuration and the installed body electronics options. Installation and coding steps are critical to restore full functionality of trailer detection and lighting. For reliable results, cloning or proper telecoding with PSA diagnostic tools is recommended.

Keywords

BSC B04-00, Trailer Control Unit, Citroën Trailer Module, Peugeot Trailer Module, 9678751080, S180085005A, 9688EL, Siemens VDO, Continental.

High-quality replacement control unit for Citroën and Peugeot vehicles, referenced under common part numbers used by workshops and DIY mechanics. This BSC B03-00 unit (Siemens VDO / Continental) is often searched by its reference codes, making it easy to find for direct swaps. Ideal for technicians and experienced hobbyists who need a reliable body/control module compatible with multiple PSA models.

Applications

Common Fitment (examples): Citroën C4 Picasso, Citroën C5 X7, Peugeot 207, Peugeot 307, Peugeot 308. Always match the product codes below with the unit removed from the vehicle before installation.

Technical Information

• Manufacturer: Siemens VDO / Continental
• Model: BSC B03-00
• Product Codes: 9665778480, S180085003E, S180085003F
• Additional Numbers: 9688EL, B03-00

Function and Description

The BSC B03-00 is a vehicle control unit that manages and monitors a range of body electronics and communications on the CAN network. It processes sensor inputs and drives outputs to actuators and other modules, ensuring coordinated operation of dependent systems. Proper function is essential for stable vehicle electronics and fault-free communication between modules.

Installation Recommendations

Follow these general instructions to replace the unit safely and correctly:

• Disconnect the battery before starting work to avoid damage to the unit and vehicle electronics.
• Access the unit by removing the required interior or engine-bay trim panels—keep track of fasteners and clips.
• Carefully unplug connectors using the proper release tabs; avoid pulling on wiring harnesses.
• Remove mounting screws and extract the old unit. Compare labels and connector layouts to ensure correct replacement.
• Fit the replacement unit in the same orientation, secure mounting points, and reconnect all plugs firmly.
• Reconnect the battery and clear stored faults. Perform a full system check with a diagnostic tool and verify proper operation of associated functions.
• Note: The unit may require adaptation/programming or parameterisation with PSA diagnostic equipment (DiagBox/Lexia/PP2000) to restore full functionality and to synchronise settings with the vehicle.
• Handle the unit as an electronic component: avoid electrostatic discharge, contamination, and impact.

Why The Part Fails Most Often

• Moisture Ingress And Corrosion: Water entry or condensation on connectors causes intermittent faults or permanent failure.
• Electrical Disturbances: Voltage spikes, poor ground connections, or jump-start incidents can damage electronic components.
• Thermal Stress And Ageing: Long-term heat cycles and aging of electronic components reduce reliability over years of service.
• Physical Damage: Impact from accidents or improper handling during repairs can break connections or housings.

Maintenance And Practical Notes

There is no fixed mileage for failure—degradation depends on vehicle use, environment, and maintenance history. Units on older cars or vehicles exposed to moisture and road salt are more likely to show faults. When replacing, always verify part numbers on the unit itself and clear stored fault codes after installation. If unusual behaviour persists, perform a full electrical inspection of battery, alternator, fuses, and grounding points before attributing faults to the control unit.